Kurzfassung:
Der sorg- und kritiklose Umgang mit synthetischen Pestiziden hat zu bereits allgemein bekannten Umweltproblemen geführt, wobei die Kontaminierung des Bodens und des Grundwassers sowie die Mitbeeinträchtigung oder gar Vergiftung anderer, nicht schädlicher Organismen besonders hervorzuheben sind. Im Gegensatz dazu sind bioaktive Naturstoffe durch ihre leichtere Abbaubarkeit und gezieltere Wirkung wesentlich umweltschonender. Durch eine kaum überschaubare Vielfalt unterschiedlicher Molekülstrukturen verfügen sie außerdem über genügend Ausweichmöglichkeiten bei der Überwindung der immer häufiger auftretenden Resistenzen gegenüber gängigen Pestiziden. Im Vergleich zu den meist importierten und teureren Industrieprodukten stellen sie in den Entwicklungsländern als nachwachsende Rohstoffe aber auch eine wichtige ökonomische Verbesserung dar.
Im vorliegenden Projekt soll ein breit angelegtes, phytochemisches Screening auf charakteristische Stoffausstattungen bei tropischen Meliaceen (Mahagoni-Gewächse) durchgeführt werden, wobei parallele Bioassays mit Gesamtextrakten gegen international bekannte Schadinsekten (Spodoptera littoralis, S. exigua, Lymantria dispar) auf das Vorkommen insektizider Arten aufmerksam machen. Biotest-gesteuerte, chromatographische Stofftrennungen führen dann zur Isolierung aktiver Reinstoffe, deren Strukturen in Zusammenarbeit mit dem Institut für Organische Chemie der Universität Wien aufgeklärt werden. Reihenverdünnungen der insektiziden Verbindungen in künstlicher Nahrung sollen schließlich zur Ermittlung genauer und vergleichbarer Aktivitätswerte (ED50, LC50) führen. Aufgrund der bereits vorliegenden Ergebnisse wird der Schwerpunkt der Untersuchungen zunächst bei der mehr als 100 Arten umfassenden Gattung Aglaia liegen.Abstract:
The careless and uncritical use of synthetic pesticides has already led to well-known environmental problems, among which the contamination of soil and ground water as well as the interference with - or even poisoning of - other non-target organisms should be especially accentuated. In contrast, bioactive natural products are much more environmentally beneficial because of their exceptional variety of different molecular structures and hence, because of their countless possibilities to overcome the increasing resistancies against the widely used pesticides. Compared with the mainly imported and more expensive industrial products, natural compounds also represent a replenishing source of raw materials in developing countries, which may contribute to an economic improvement.
In the present project a broad-based phytochemical screening within the tropical Meliaceae (mahogany family) should inform about characteristic chemical equipments. At the same time bioassays of crude extracts against the internationally wellknown pest insects Spodoptera littoralis, S. exigua, and Lymantria dispar will indicate the presence of insecticidal activities. Bioassayguided chromatographic separations of active samples will then lead to the isolation of pure active compounds, whose structures will be elucidated in close collaboration with the Institute of Organic Chemistry, University of Vienna. More detailed and comparable values of activity (ED50, LC50) will be achieved by serial dilutions of insecticidal compounds in artificial diet. Based on preliminary results this investigation will focus first on the genus Aglaia comprising more than 100 species.
Kurzfassung:
Ökotone sind Übergangszonen zwischen benachbarten ökologischen Systemen. Sie sind durch charakteristische Maßstäbe in Zeit und Raum gekennzeichnet unter interagieren mit den ben-achbarten ökologischen Einheiten. Flußkorridore bestehen aus verschiedenen ökologischen Teilsystemen, die durch Ökotone unterschiedlicher Art, Größe und Funktion getrennt sind.Projektleitung:
Allgemeine Projektziele
- Identifikation steuernder Faktoren und charakteristischer Prozesse in den Ökotontypen der Flußkorridore von Donau und March
- Kritische Beurteilung der "Key-questions" und Hypothesen der MaB-Kommission.
- Beiträge zur Erhaltung, Rehabilitation and Reconstruction von Untereinheiten der Flußland-schaft.
- Herstellen einer wissenschaftlichen Basis für künftige Managementkonzepte.
Um dem umfassenden Ansatz des Projektes gerecht werder zu können, wurden 15 Module als organisatorische Einheiten auf fachlich- interdisziplinärer Basis eingerichtet. Einige Module charakterisieren verschiedene Ökotontypen (z.B. Fluß-Litoral, Auwald, Gewässersystem), an-dere umfassen Spezialgebiete (z.B. Hydrologie, Boden und Sedimente, Mikrobiologie).
Das Projekt befindet sich in der Abschlußphase:
Datensätze auf dem Niveau der Arten und höherer biologischer Einheiten werden zur Zeit mit den dominierenden steuernden Faktoren mittels eines Geographischen Informationssystems in Beziehung gesetzt. Ein dynamisches hydrologisches Modell und Fernerkundungstechniken (z.B. Infrarot-Falschfarben Luftbilder) werden zur näheren Bestimmung von Ökoton-Eigenschaften und Funktionen auf dem Landschaftsniveau herangezogen.
The final report will be presented in 1999, comprising a critical evaluation of hypotheses and key questions on ecotone functioning, and the interdisciplinary scientific synopsis.
Abstract:
Ecotones River Danube - River March
Ecotones are zones of transition between adjacent ecological systems. They show characteris-tic space and time scales and interact with adjacent ecological systems. Fluvial corridors consist of various ecosystem patches which are separated by ecotones of different type, size and function.
General objectives of the project:
- Identification of steering factors and characteristic processes in ecotones of the fluvial corridors of the River Danube and River March (Morava).
- Critical evaluation of Key-questions and Hypotheses presented by the MaB-Commission.
- Contribution to conservation, rehabilitation and reconstruction of landscape units.
- Forming a scientific basis for a management concept.
The wide scope of the project called for subdivision into 15 modules, which are organisational units built on an interdisciplinary basis. Some modules characterise different flood plain ecotone types (e.g. littoral zone, flood plain forest, backwater system), some modules comprise special topics (e.g. hydrology, soils and sediment, microbiology).
At present the project is in its final phase:
Data sets on species and higher biotic units which characterise different ecotone types are related with the dominant steering environmental factors in a GIS-base. Dynamic hydrological models and remote sensing technics (e.g. IR-false colour aerial photography) are used to determine ecotone features and functioning on the landscape level.
The final report will be presented in 1999, comprising a critical evaluation of hypotheses and key questions on ecotone functioning, and the interdisciplinary scientific synopsis.
Abstract:
CHANGING LANDSCAPE AND AGRICULTURE.
Subtitel: Greenland in Austria's
mountain region.
This project aims at the analysis
of interlinkages between the greenland's system ecology and socio-economy
as well as their theoretical formulation. From this analysis insights should
be gained into the processes of change in the greenland which can be applied
to concrete instructions for the management of the greenland in oder to
arrive at optimal intensities of utilization which would guarantee the
social and economic values of the greenland in the best possible way.
Building upon research results from
the pilot project carried out in the central Enns Valley of Styria which
directly link ecosystemic and socio-economic factors a theoretical research
framework is being developed that incorporates the environmental as well
as the societal resource base of the greenland which will permit finding
an answer to the central research question concerning the optimality of
the intensity of utilization of the greenland.
Projektleitung:
Statistical Overview of Alpine Grassland
Klaus Wagner
Federal Institute of Agricultural Economics
Vienna, Austria
e-mail: klaus.wagner@awi.bmlf.gv.at
The report describes the first step of the project of the Federal Institute of Agriculture in the framework of the MaB-project “Alpine Grassland”. It gives a statistical overview of the grassland and its development in Austria, focussing on the alpine grassland. The difficult natural resources of the alpine regions are presented also the different land use-patterns against the socio-economic and demographic background. One aim of the project is to find the different types of grassland and grassland-farming in the alpine region to make it possible to react in a correct way to the very different developments of grassland and its use in the alps.
Natural Conditions of Grassland Area and Sociocultural Framework
Intensity of Grasslands
Martin Seger
Institute of Geography
Klagenfurt, Austria
e-mail: martin.seger@uni-klu.ac.at
Geography‘s contribution within the MAB-grassland project is on the one hand a support at the test sites (e.g.: poster „land use change Ennstal“). Another goal is a country-wide overview related to grassland patterns and processes with two very different methods: a GIS takes the technological state of the art to present facts about the alpine „Kulturlandschaft“. Contrasting to that a qualitative and humanistic approach is used: the visualisation of the mountaneous grassland areas. Disparities in grassland biodiversity, in grassland economy and a landscape typology are documented by images. The importance of farming for the sustainability of the scenic attraction is demonstrated by this visualisation. From a theoretical point of view, land use processes will be explained as the result of interactions between the socioeconomical system and the natural conditions of a site/of a region. The benefit of this theory is a contribution to the prediction of further land use changes.
Utilisation intensities of alpine grassland ? at the intersection
of biosphere and social-economic sphere
Explanatory interdisciplinary models of differentiation of utilisation
and cultivation intensities
Hans Karl Wytrzens
Institute of Agricultural Economics
University of Agricultural Sciences
Vienna, Austria
e-mail: wytrzens@edv1.boku.ac.at
Mountain areas are often characterised by difficult economic situations
and ecological sensitivity. Any attempt to optimise land use in such regions
on a long-term, sustainable basis must be based on a comprehensive understanding
of the workings of the land-use system currently dominating mountain landscapes:
“grassland”. Grassland’s very existence, its functions and its future prospects
are determined by a complex of interactions between natural and economic
factors. Theoretical considerations and the empirical results of pilot
studies show that the following groups of factors have the greatest influence
on grassland characteristics:
– key ecological factors, namely topography, climate, pedology and
vegetation ecology
– key socioeconomic factors, namely the socioeconomic operating environment
(as determined by legislation, agricultural policy, agricultural markets
and infrastructure), and enterprise level factors (stocking densities,
milk quotas etc.)
Given the diversity of these determinants and the interactions between
them, a proper understanding of all the relevant relationships can only
be achieved through interdisciplinary research approaches. This should
involve co-operation between agricultural economists, geographers, production
technologists and botanists. Appropriate research should help explain why
the intensity of use and management of grassland varies so much. It should
also help identify promising intervention strategies which would allow
us to guide the use and management of grassland towards those forms and
intensities most desired by society.
The interdisciplinary model designed to address these issues is based
on the idea that we need to find the relationships between those factors
described above (independent variables) and grassland usage or management
intensity (dependent variables). In the context of a multifunctional agriculture,
we are looking to find an explanation for “grassland usage intensity”,
a concept which needs closer definition. “Grassland use” is taken to include
any demand placed on pastures or meadows in order to satisfy a need. “Grassland
usage intensity” should then reflect the range of tasks which individual
parcels of land are expected to fulfil. The level of this intensity depends
on both the number of different types of use and the extent of the actual
demands made by each usage form.
Agricultural management underpins the existence of grassland, so the
intensity of this management is also calculated independent of total usage
intensity. This management intensity characterises the degree of economic
exploitation of grassland in the context of agriculture, whereby factors
related to agricultural technology are also drawn into the model.
Preliminary work with individual components of the full interdisciplinary
model (which is still under construction) already shows that there are
indeed plausible and complex relationships between economic /ecological
variables and the intensity of use / management of grassland. The next
stage of the research is concentrating on adapting the existing partial
models so that they can be integrated within a single model.
Mountain meadows in the Czech Republic
Eliška Bittnerová
Bílé Karpaty Biosphere Reserve, Bartolomejské
nám. 47
CZ - 698 01 Veselí nad Moravou
e-mail: csop@es-servis.cz
The most important mountainous and submountainous grasslands of the
Czech Republic are found in the Krkonoše (Giant Mountains), Šumava (Bavarian
Forest) and Bílé Karpaty (White Carpathians) biosphere reserves.
The paper deals with the following items concerning these areas:
- origin of the grasslands (predominantly anthropogenous, caused by
colonization, deforestation, farming)
- main types of meadows, their plant communities and important plant
and animal species
- recreational function of grasslands (skiing, agri-tourism, etc.)
- changes in traditional farming activities after the 2nd World
War (nationalization, intensification, destruction) and the impact on spatial
and species diversity
- management activities by the BR administrations (e.g. mowing, cattle
grazing, restoration), collaboration with farmers, municipalities and NGOs
- monitoring of the effects of different management types on biodiversity
and endangered plant species, first results
- subvention policy, position of the Ministry of the Environment and
Ministry of Agriculture
- current farming, biological farms, sustainable forms of agriculture.
Dobromil Galvanek
DAPHNE
Bratislava, Slovakia
e-mail: DAPHNE@changenet.sk
The grassland inventory project in Slovakia started in 1998 in the co-operation
of Slovak NGO DAPHNE and Dutch NGO Royal Dutch Society for Nature Conservation.
The data from the mapping should fill the gap in the knowledge about current
distribution of different types of grasslands in Slovakia, about their
diversity and management. The classification system for grasslands should
be created for both scientific and managerial purposes. Then the most threatened
and the most unique types and localities will be recognised and state subsidies
in agricultural sector should be preferentially oriented for their management.
The field mapping started in 1999, with the help of more than 80 mapping
experts from whole Slovakia. The estimation of grassland coverage in Slovakia
according remote sensing analysis is more than 8400 km2. Especially mountain
areas with seminatural grasslands are mapped in the first stage of the
project. It is planned to finish field mapping in 5 years.
Grasslands in the UNESCO-MAB Biosphere Reserve East Carpathians: influences of land-use and management changes
Luboš Halada
Institute of Landscape Ecology SAS, Branch Nitra, Akademická
2
SK-949 01 Nitra, Slovakia
E-mail: nrukhala@savba.sk
Grasslands in the Biosphere Reserve East Carpathians are of cultural-historical
as well as of scientific and nature conservation importance. They have
a high biodiversity, they are rich in endangered and rare species as well
as east-carpathian species with occurrence on the west boundary of their
area of distribution. During the last 25 years large changes were carried
out in the mood of grassland management in the Biosphere Reserve, grasslands
are endangered by degradation and retreat, resp. extinction. Permanent
monitoring plots, covering all endangered meadow communities and 75% of
grassland and wetland plant species, known from the Slovak part of the
Biosphere Reserve have been established. Species composition and abundance
in relationship with mood of management is recorded each year. First results
show significant changes in species composition as a result of different
types of management.
Construction of the water reservoir "Starina" in 1987 represented important
impulse for starting of the large-scale changes of land-use in part of
the BR East Carpathians. All villages in the reservoir watershed were evacuated,
grassland, fields, orchards, and gardens were abandoned. Data on vegetation
structure, soils and geomorphology in the upper part of the Cirocha river
watershed were collected in 1999. After their completion by further data,
especially concerning land-use changes, they can serve as a basic material
for monitoring of non-forest vegetation changes and for identification
of the most important sites for grasslands biodiversity protection.
Changes in farming systems, landscape, and nature:
key success factors of agri-environmental schemes
Karlheinz Knickel
Johann Wolfgang Goethe - University
Frankfurt (Germany)
e-mail: knickel@em.uni-frankfurt.de
This paper proposed for the above symposium deals with changes in farming
systems and nature conservation. The main questions asked are: How are
changes in farming systems influenced by agri-environmental schemes? What
makes agri-environmental schemes successful? Which criteria can be used
to target schemes and to evaluate their effectiveness?
Focus is on:
- grassland-based farming systems in mountainous areas;
- the present situation and the relevant trends in Germany;
- the immediate and longer term effects on nature conservation;
- the question why a detailed understanding of the ecological
links between farming practi-ces and wildlife value is necessary in order
to formulate clear and effective policies.
The paper starts with a brief overview of trends in agricultural structures
and production conditions in relevant regions of Germany. A major trend,
the continuing concentration of crop and live-stock production in areas
with intensive farming and the decoupling of less favoured areas from mainstream
production, is discussed. The corresponding changes in farming systems
and their impact on biodiversity provide the background for a discussion
of the experiences with agri-environmental programs.
As for grassland-based farming systems there has been a strong tendency
towards the abandonment of rough grazing systems with sheep as well as
of semi-intensive mixed farming with dairy cows in most parts of Germany.
The general trend is that the meadows which are remaining in production
are very intensively utilized and that grassland used as pastures has decreased
substantially. Most semi-natural, species rich grasslands and breeding
areas for meadow birds were lost. Today, most milk and beef production
is characterized by indoor systems and by rela-tively high inputs of concentrate
feed. As for dairy cows there has been a major shift from more hilly grassland
areas - the traditional beef and milk producing areas - to more central,
mixed farm-ing areas with more capital intensive production systems.
The local and regional effects of these changes on nature, landscape
and the environment were substantial. Regionally, they led to the
loss of richly structured and ecologically valuable landscapes and to an
unprecedented reduction of species diversity manifesting itself visibly
in the Red Lists of endangered plant and animal species. Key changes in
wildlife value and correlation with changes in grassland-based farming
systems are discussed.
Agri-environmental programs are one approach to deal with environmental
problems. A large proportion of Reg. (EEC) 2078/92 measures are addressed
towards protecting and enhancing the cultural landscape. Actual uptake
of measures is concentrated in Mittelgebirgsregionen (upland and mountainous
regions) and generally in regions where poorer soils and grassland predominate.
The acceptance in intensively used regions with greater proportions of
fertile arable land is comparatively low. In regions with higher uptake
production systems often had been extensive even before the introduction
of the schemes. The German farmers associa-tion emphasizes that farmers
are active and supporting as long as the agreements are voluntary and if
premiums are sufficiently attractive. Farmers reluctance concerning the
adop-tion of measures which support the conversion to organic farming is
partly explained by the relatively low financial incentives. Probably more
important is the fact that marketing channels for organic produce are still
too weak.
A particular advantage of Reg. (EEC) 2078/92 programs is that they
have the potential to be very region specific. In correspondence the majority
of agri-environmental schemes receiving EU co-financing is in Germany implemented
through Laender specific programs which differ considerably. These variations
reflect differences between Laender in agricultural, infrastructural and
regional structures, in experiences with earlier programs and policies,
the particular political and institutional situation, traditions, the particular
environmental problems and the available financial means.
The question of assessing the ‘success’ of agri-environmental schemes
is discussed in terms of the expected changes and a comparison with the
actual outcome. Relevant criteria are uptake rates, actual changes achieved
(in farming patterns, in production systems / practices), the stabilization
of (often more traditional) high value systems, environmental effects and
effects on nature protection (immediate and longer term), changes in attitudes,
the achievement of structural adjustments (in farm structure and farm development
strategies), farm income effects (micro-level; absolute and relative),
the cost effectiveness of schemes (macro-level: administration and control
costs), and finally, the public support for the scheme.
In the conclusions it is emphasized that agri-environmental schemes
cannot overcome mainstream economics, because by their very nature they
should be site-specific and focused on particular problems and potentials.
It is pointed out that the pronounced regional variation of agriculture
and of types and intensities of land use in Germany has to be reflected
in a rather broad and yet regionally differentiated agro-environmental
policy framework. The fact that the specialization (regional and
farm level) and intensification of agricultural production has over a long
time been driven by economic signals sent by natio-nal governments and
the CAP, is emphasized. In line with that it is argued that any stabilization
of cer-tain traditional farming systems without major changes in overall
economic framework conditions (prices, costs, markets) and without major
farm structural changes requires very significant permanent subsidies.
A significant deficit is seen in the lack of complementary programs which
support investments aimed at the promotion of structural and longterm changes.
Examples are the improvement of more decentralized, regional and local
marketing structures, and the establishment of biotope networks in
mixed farming areas (e.g. hedges, semi-natural grassland and vegetation
along rivers).
Changing of structures and productivity of different types of grassland in Tajikistan under anthropogenetic influence
Abdullo A. MADAMINOV
Institute of Botany
Academy of Sciences
Dushanbe, Tajikistan
e-mail: abdulloh@academy.td.silk.org
Tajikistan is highland country and 93 per cent of it territory in covered
by mountains altitude - from 350 to 7000 m above sea-level, with precipitation
varying from 70-100 mm to 1300-1500 mm per year. The mountain character
of our Republic results in a complex mosaic of local bioclimatical conditions.
The whole area of Tajikistan is 14.3 million hectare, grasslands occupy
24.5% or 3.5 million hectare, forests - 3% and - 5%. The natural pasture
(semisavannas, steppe and meadows types) is the important base of animal
husbandry for Tajikistan. Main limited factors are short growing seasonand
low production. The overgrazing and trampling brings about serious degradation
of grassland, with a decrease of edible herbage and on increase of detrimental
and poisonous weeds giving rise to reduction of productivity. Several key
countermeasures of grassland management should be strengthened for sustainable
development of animal husbandry.
The field station of the Tajik Botanical Institute occur in Western
Tajikistan along profile in various zones and herbaceous floro-coenotypes
from semisavannas and ephemeretum to subalpine steppes and alpine meadows.
For several years (with 1950) now they been studying the above- and
underground structure and species diversity of vegetation communities,
their development from season to season changes biological productivity
and water balance, and the biology of principal species and their biochemical
composition connected with anthropogenic influences (grazing, moving, cutting,
fertilizer application). The research has been accompanied by experiments
with fodder crops, improvements of grassland and their rasional use.
The short grasses of semisavannas (Carex pachystylis, Poa bulbosa,
350- 800 m a.s.l.) develop best in winter and spring. The yield of aboveground
phytomass varies from 0.20 to 2.23 t/ha (dry wieght), species diversity
index (by Shannon, H) - 0.951 and equability index (J) - 0.453. The application
of mineral fertilizers results in a three-time increase in the yields,
the content of digestible protein increased to 200% in the grass.
The tall grass semisavannas (Elytrigia trichophora, Hordeum bulbosum,
900-1800 m a.s.l.), yield 1.40 - 3.51 t/ha, H - 1.867, J - 0.542. The aboveground
to underground phytomass ratio respectively equals 1:8. The application
of mineral fertilizer (N90P45) increased in the yields of tall grass semisavannas
to 7.56 t/ha.
The yield of aboveground phitomass of the subalpine bunch-grass steppe
(Festuca sulcata, Leucopoa olgae, Geranium regelii, Cousinia franchetii,
2500-3500 m a.s.l.) depending on weather conditions, varies from 0.46 to
1.45 t/ha. Alpine forb steppes (Nepeta podostachys, Lindelophia olgae,
Piptatherum alpestre, 3000-4000 m a.s.l.) yield 0.68 - 1.78 t/ha. Alpine
short grass meadows (puccinellia supspicata, Allium fedtschenkoanum) yield
0.30 - 1.40 t/ha. The application of fertilizer was increased in yields
of steppes and meadows pastures to 2.94 - 3.50 t/ha in average.
The effect anthropogenic factors (grazing, fertilizer application etc.)
made considerable changes in species diversity of Tajikistan.
An ecological-economic model for agri-environmental policy decision support
David R. Oglethorpe *) and Roy A. Sanderson**)
*) Natural Resource Economics Department, Scottish Agricultural College,
Edinburgh, EH9 3JG, UK.
**) Centre for Land Use and Water Resources Research, University of
Newcastle Upon Tyne, NE1 7RU, UK.
Correspondence Address:
Dr David R. Oglethorpe, Natural Resource Economics Department,
Scottish Agricultural College,
Kings Buildings, West Mains Road
Edinburgh, EH9 3JG, UK.
e-mail: D.Oglethorpe@ed.sac.ac.uk
Operational models of economic activity, particularly at the farm scale, have become commonly used, and widely accepted methods and applications exist. Operational models of ecological systems probably have less of a history but processes of species interaction and succession are well documented. Relationships between economic farm-scale variables and resultant ecological diversity, however, are less well documented as are modelling frameworks which combine both economic and ecological operational systems. This paper explains how a utility maximising economic modelling framework may be linked to an ecological modelling system with the objective of allowing ex ante assessment of the ecological impact of certain key agricultural management parameters. Two models, initially designed for independent analyses, are introduced. Data pertaining to a survey of farm sites are used to demonstrate the types of relationships which emerge between agricultural management parameters and grassland vegetation. A specific case-study site is selected for ecological and economic assessment under potential policy scenarios. The results of the analysis highlight the relevance of such an integrated modelling system for agri-environmental policy decision support.
Considerations on the dynamics of the mountain grasslands in the South Carpathians (Romania)
Mihaela Pauca-Comanescu, T. Marusca
Institute of Biology, Romanian Academy
Department of Ecology
Spl. Independentei 296,
79651- Buckarest, Romania
e-mail: mcpauca@fx.ro
The Southern part of the Carpathian Mts. is in Romania extends over a third of the country's area and is covered with more than 2 million hectares of grasslands. The Romanian mountain grasslands are presented in their natural successions between 500 - 2500 m altitude, with respect to the ratio forest : grassland in the nemoral belt and their productivity dynamics along altitudinal gradients. In a case study investigated in the Bucegi mountains data are given about morphological, chemical and physiological differences between some plant populations (Festuca rubra, F. airoides, Anthoxanthum odoratum, Trifolium pratense, Potentilla ternata, Viola declinata) located in a montane and a sub-alpine pasture. Current issues regarding the mountain pastures in Romania are pointed out :decrease of animals stocks, change in the structure of animals grazing the pastures, increase of abandoned arable areas etc.
General trends of fauna biodiversity dynamics as the result of the anthropogenic transformation of the meadow landscapes.
Mikhail M.Pikulik
Institute of Zoology
National Academy of Sciences of Belarus
Minsk, Belarus
e-mail: mab@mserv.bas-net.by
The data, which have been collected by Institute of Zoology of National
Academy of Sciences of Belarus within last 25 years, are analyzed. These
data characterize the influence of the meadow anthropogenic transformation
on different systematic groups of wild fauna biodiversity dynamics in Belarus.
Meadow ecosystems of Belarus occupy 3,286,100 hectares (15,8 % of the
territory). The most important global ecological value among them has river
floodplain, or water meadows (5,2%). In the recent 35-40 years meadows
have been subjected to a severe anthropogenic transformation and their
area has been cut by almost 50%.
The different forms of drainage reclamation followed by cattle pasture
and agriculture are the main factors of influence on meadow landscapes.
The initial stage of meadow’s transformation is characterized by zoocenozis
structure alteration - complete vanishing of single species, reduction
of the number, domination change from one side; appearance of new species,
increase in the number of some species and groups of animals - from the
other side.
The landscape-geographic relationship of drainage boggy and unundable
land reclamation consequences was found. Zoocenozis of the wide unundable
zones (Polessie, the South of Belarus) are more resistant than zoocenozis
with narrow floodplain (the North of Belarus).
The report will be focused on the contemporary approaches of complex
assessment of influence of drainage land reclamation and other forms of
the anthropogenic transformation on fauna considering National strategy
and action plan on conservation and sustainable use of biological diversity
in the Republic of Belarus. The recommendations for ecological optimization
of the meadow landscapes economic use will be presented.
Semi-natural grasslands of the Slovak Carpathians - present state, endangerment and possibilities of their protection
Helena Ruzickova
Institute of Landscape Ecology SAS
Bratislava, Slovakia
At present grasslands occupy 30,5 % and pastures 22,7 % of agriculture
soil. Of course their distribution is not even, in lower areas there are
less pastures, but certain mountain villages farm almost only on grass
stands. The present state, extent, mood of use and the consequent species
composition of the majority of grasslands was influenced by gradual extintion
of private farming after 1950, arising of cooperative farms, extinction
of their traditional way of utilization. By generous financial state support
thex have been recultivated, drained, landscape verdure has been removed,
adjusted areas have been planted by not original specoes of grasses and
clovers reacting very well on mineral fertilization. Meadows that could
be intensified by this way - on steep slopes, badly accessible sites, far
mountain ridges were afforested (natural and artificial seeding), changed
to pastures or lie fallow.
Intensive mood of managemt was connected also with the concentration
of farming animals. Permanent as well as transitional shedding of large
stocks, their grazing on sensitive substrata disposed to erosion causes
serious ecological problems on many sites.
Semi-natural grasslands managed in traditional way can be found only
in the villages where collectivization has not been carried out, around
secluded houses, isolated "kopanitse" settlements, in old long-boled orchards,
around gamekeeper's cottages, shooting lodges etc. In Slovakia there are
only few and they are not recorded.
In spite of the fact, that grasslans rich in species are one of the
most endangered plant communities of Slovakia, only a small part of them
is protected by special regime of management in nature reserves. Therefore
there are only a small chance for conservation of a wide scale of extensive
types rich in species. In agriculture or nature protection there are not
separated financies for regular, organized management of selected types
of stands.
Sheep grazing as alternative management of mountain meadows
František Krahulec, Vìra Hadincová, Tomáš Herben, Radka Freiová, Sylvie Pecháèková, Hana Skálová, Irena Láková, Miloslav BílekInstitute of Botany
Academy of Sciences of the Czech Republic
CZ-252 43 Pruhonice u Prahy, Czech Rep.
e-mail: skalova@ibot.cas.czMountain meadows in the Sudeten Mts. (Czech Republic) were traditionally managed by cutting and in late autumn they were grazed by cattle. These activities disappeared essentially following socio-economic and political changes after the IInd WW; as a result, species richness of these grasslands declined and share of several dominant species increased. We tested sheep grazing as a potential alternative careful approach had to be taken as the region is state-protected. The experiment took place in a mountain meadow (1200-1250 m) over eight years. Significant changes appeared after two years of grazing; it lead to suppression of the dominant herb, Polygonum bistorta. Proportion of grasses (Deschampsia cespitosa, Festuca rubra, Agrostis capillaris) increased. Share of several herbs increased as well often in spite of the fact that they were selectively grazed (Adenostyles alliariae, Melandrium rubrum); their increase was due to gaps created by sheep. The best way of management is the combination of sheep grazing and mowing that would suppress Deschampsia.
Management of grasslands in the Krkonoše Mts:28/09/1999/GSCH
What do we knowFrantišek Krahulec, Vìra Hadincová , Tomáš Herben, Radka Freiová, Sylvie Pecháèková, Hana Skálová
Institute of Botany
Academy of Sciences of the Czech Republic
CZ-252 43 Pruhonice u Prahy, Czech Rep.
e-mail: skalova@ibot.cas.czMost of the meadows in the Krkonoše Mts is a product of man activities. Only small part of them may be considered as primary communities, occurring near the timberline and on the periphery of glacial cirques. There are rare mountain meadows on the Polish side of this mountain range due to different land use in the past. Mountain meadows are important habitats for several rare alpine species (e.g. Campanula bohemica, Geum montanum, Viola lutea subsp. sudetica). The existence of mountain meadows was possible only under their continuing use as cutting or grazing; only some of them were fertilised by dung in the past. Different habitat conditions and different management lead to the formation of many types of plant communities (the number of distinguished associations is higher than 20). The present state of the meadows is bad: traditional management mostly disappeared, nitrogen pollution changes the proportions of particular species and increased the losses of the kations. These circumstances influence us to look for new forms of management as sheep grazing and mulching protecting species composition at selected sites. Unfortunately, the representative network of sites is not complete; the detailed knowledge is available only for selected communities.
Anthropogenous Vegetation Changes in Alpine Tundra, a Remote Sensing Study from the Krkonoše Mts Biosphere Reserve, Czech Republic -
Preliminary resultsJana Straskrabova
Institute of Botany
Academy of Sciences of Czech Republic
Pruhonice, CZ-25243 Czech Republic
e-mail: straskrabova@ibot.cas.czChanges in the arcto-alpine tundra vegetation of the Krkonoše (Giant) Mts plateau (1200-1300 m a.s.l.) were studied by various remote sensing methods. The study was focused on human-caused disturbances, mainly road and trail impact. The study area has extreme climatic conditions; it is formed by crystalline metamorphic rocks covered by poor acidic soils of the alpine sod podzol type. It represents a fragile ecosystem sensitive to eutrophication, synanthrophization, ruderalization and other types of anthropogenous impact.
The native vegetation of the area is dominated mostly by Nardus stricta, a dominant species with a low competitive ability and a high vulnerability to mechanical disturbance (e. g. trampling). These communities are endangered by increasing expansion of grasses, mainly Deschampsia flexuosa, Calamagrostis villosa and Molinia coerulea. Communities dominated by Calamagrostis villosa, Molinia coerulea, Veratrum lobelianum, Senecio hercynicum or Cirsium heterophyllum, i. e. species producing higher biomass, are found in the surroundings of Pinus mugho shrubs, on sites with long-lasting snow cover, in terrain depressions, stream alluvia or on disturbed sites.
The most pronounced impact on vegetation composition is caused by unsuitable alkaline building material used in the 60th and 70th for paving some roads and walking trails in the study area. This has a profound effect on the environment which was originally nutrient poor. Alkaline ions are continuously washed out and spread into the surroundings; this process is enhanced by a high humidity of the area.
Species poor or even monospecific stands on such sites have remarkably higher biomass than Nardus communities. They are formed by (i) typical ruderal species such as Urtica dioica or Rumex alpinus (the latter introduced probably by local farmers in the 16-17th century as a pig forage), (ii) species native to the Krkonoše Mts but naturally occurring at lower altitudes such as Senecio fuchsi, or (iii) expansive native species naturally growing on humid tundra patches richer in nutrients, such as little depressions, stream alluvia, surroundings of Pinus mugho shrubs and snow fields (Senecio hercynicus, Cirsium heterophyllum, Veratrum lobelianum, Deschampsia caespitosa, Callamagrostis villosa). All these species are penetrating far into low competitive natural communities (mainly dominated by Nardus stricta), forming lobes reflecting terrain conditions.
This phenomenon can be studied by remote sensing methods because the vegetation of affected stands is remarkable taller, producing higher biomass than the oppressed natural communities. In this study, aerial multispectral photographs and colour diapositives are analysed by digital classification, unsupervised (ISODATA classification) and supervised (parallelepiped classification) using software Chips developed at Institute of Geography, Copenhagen University, Denmark. Historical and current field data, GPS measurements and historical panchromatic photographs are used as an additional source of information. Different sources and methods are compared and possibilities of application of these methods for vegetation mapping are considered.
The use of aerial photography (i. e. analogous data) converted into digital form causes technical problems related to rectification (e.g. fitting channels together), radiometric and geometric correction with often unknown parameters, differences in exposure, light adjustment etc. However, its great advantage over the satellite imagery is the high spatial resolution, indispensable for detailed vegetation studies. Furthermore, historical data sets covering the whole country since the 1950s are available and aerial data are relatively inexpensive to obtain in the Czech Republic.
Submontane grasslands in the Czech Republic: interdisciplinary project „Kamenicky II“.
František Hrabe*), Marta Tesasová**)
*)Dpt. of Fodder Crops Growing
**)Dpt. of Pedology and Microbiology
Mendel University of Agriculture and Forestry
Brno,Czech Republic
e-mail: tesarova@mendelu.czThe project „Kamenicky II“ was started in 1992 year as a continuation of the MAB field Project No 91“ Function of Grasslands in a Spring Region – the Kamenicky Project „ (the operational phase 1972-1985). The aim of the present project is to find out how to exploit efficiently the poor submontane grass stands with respect to the landcape protection. A field experiment was set up near the village Kamenicky (624 m a.m.s.l., average air temperature 6.5° C, yearly sum of precipitation 760 mm) in the landscape reserve Zdárské vrchy region (Bohemian - Moravian Highlands). The experimental variants include natural and renovated grasslands (renovation either by surface sowing or by ploughing and re-seeding) influenced by different doses of mineral fertilizers. Forage production and quality and mass of roots are regularly determined. The soil quality, above all pH, CEC, nutrients, organic matter content and humus quality as well as capacity of soil biota to decompose organic debris, to synthesize humus and to mobilize/immobilize mineral nitrogen are followed, too. Special attention is paid to the species diversity of plants and soil microorganisms. The results obtained during 1992-1998 years have proved that production potential of natural submontaineous grasslands is about 4t.ha-1. year-1. Proper management, i.e. three-times cutting and mineral fertilizers in doses N90 P30 K60 kg.ha-1 . year –1 increases the forage production of natural and renovated grasslands to about 7-8 t.ha-1 . year-1, improves the soil quality and maintains the biodiversity. Higher doses of mineral fertilizers are unrational both from economical and ecological point of view.