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Mountain Pastures and Grasslands in the SW Tien Shan,Kyrgyzstan-Floristic Patterns,Environmental Gradients,Phytogeography,and Grazing Impact

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Journal of Mountain Science 2011年第3期8卷 363-373页

作者： BORCHARDT Peter SCHICKHOFF Udo SCHEITWEILER Sabrina KULIKOV Maksim University of Hamburg Institute of Geography

Vast grasslands are found in the walnut-fruit forest region of southern Kyrgyzstan,Middle *** above the worldwide unique walnutfruit forests and used for grazing,they play a pivotal role in the mixed mountain agriculture of local ***,these pastures are subject to an increasing utilization pressure reflecting the changing political and social conditions in the transformation process from a Soviet republic to an independent state.A first detailed analysis of mountain pasture vegetation in the Ferghana Range answers the following questions:What are the main plant community types among Kyrgyzstan's mountain pastures? What are the main environmental gradients that shape their species composition? Which phytogeographical distribution types are predominant? How does grazing affect community composition and species richness in these grasslands? Species composition was classified by cluster analysis;underlying environmental gradients were explored using DCA.A dataset of 395 relevés was used for classification,and a subset of 79 relevés was used in a DCA to analyze the correlation between vegetation,environment,and grazing *** investigated pastures were classified into four distinctive plant *** site factors altitude,heat load,inclination and grazing impact were found to be the major determinants of the vegetation pattern.A significant overlap between floristic composition and structural and spatial properties was *** majority of the species pool consisted of Middle Asian endemics and Eurosiberian ***,disturbance-tolerant species played a significant role with respect to species composition and coverage of the herbaceous layer in vast areas of southern Kyrgyzstan's mountain *** general,an intense grazing impact is clearly reflected by both species composition and structural variables of plant *** highly diverse and unique ecosystem is modified by an increasing utilization *** order to ma

关键词： Central Asia Classification Endemics Gradient Analysis Grazing impact Middle Asia Pasture Management ruderals Transformation Process Walnut-fruit forest.

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Abandoned corrals: colonization and vegetation recovery of ephemeral habitats in silvo-pastoral systems

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Journal of Plant Ecology 2020年第6期13卷 722-731页

作者： Arie Vinograd Eli Zaady Jaime Kigel Institute of Plant Science and Genetics in Agriculture Robert H.Smith Faculty of AgricultureFood and EnvironmentHebrew University of JerusalemRehovot 76100Israel Department of Natural Resources Gilat Research CenterAROMobile Post Negev 85280Israel

Aims Management of silvo-pastoral systems in planted and natural forests in semi-arid Mediterranean regions often employs seasonal night corrals for animal *** management system changes the spatial distribution of animal excreta,resulting in a net transfer of soil mineral resources and their accumulation in the *** abandonment,corrals are colonized by ruderal species,becoming focal sources for their spread in the *** aimed to implement a rational management of seasonal sheep corrals based on a better understanding of the vegetation processes occurring in abandoned corrals,in order to alleviate their negative impact in the *** Relationships between temporal changes in the vegetation,the soil seed-bank and levels of soil nutrients were studied in a chronosequence of abandoned sheep corrals and compared with nearby reference plots in planted Eucalyptus forests grazed by sheep in the semi-arid North-Western Negev,*** region has a bi-seasonal Mediterranean climate,with high dominance of annual species in the grazing *** Findings Abandoned sheep corrals were colonized by seeds of ruderals originating in older abandoned *** successional changes occur at a slow rate,driven by the depletion of soil resources in the abandoned corrals,and were still in progress 20 years after *** were gradually replaced,first by taller grasses and followed by short grasses,but most forbs and particularly geophytes did not recover during this *** of the original herbaceous vegetation in the corrals was through seed dispersal from the surrounding vegetation,not from the original soil seed-bank remaining in the corrals after *** species in the grazed,planted forests behave as patch-tracking *** persistency depends on constant creation of new corrals compensating for the gradually dwindling populations in older abandoned corrals,and on the availability of dispersa

关键词： metapopulation ruderals seasonal grazing seed-bank sheep succession

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