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Forest encroachment in Eastern European forest-steppes at a decadal time scale

Journal of Plant Ecology 2024年第5期17卷 205-216页

作者： LászlóErdős GáborÓnodi Csaba Tölgyesi György Kröel-Dulay Zoltán Bátori Eszter Aradi Péter Török Khanh Vu Ho Indri Puspitasari LászlóKörmöczi Institute of Ecology and Botany HUN-REN Centre for Ecological Research2163 VácrátótHungary Department of Ecology University of Debrecen4032 DebrecenHungary MTA-SZTE‘Momentum’Applied Ecology Research Group University of Szeged6726 SzegedHungary Department of Ecology University of Szeged6726 SzegedHungary Kiskunság National Park Directorate 6000 KecskemétHungary HUN-REN-DE Functional and Restoration Ecology Research Group 4032 DebrecenHungary Botanical Garden–Center for Biological Diversity Conservation in Powsin Polish Academy of Sciences02-973 WarszawaPoland Doctoral School of Environmental Sciences University of Szeged6720 SzegedHungary Faculty of Natural Resources-Environment Kien Giang University91706 Kien GiangVietnam

In the Eurasian forest-steppe,with increasing aridity,the balance between naturally co-existing forest and grassland patches is expected to shift towards grassland dominance in the long run,although feedback mechanisms and changes in land-use may alter this *** this study,we compared old and recent aerial photographs of Hungarian forest-steppes to find out whether and how the forest proportion and the number of forest patches change at the decadal time *** percentage area covered by forest significantly increased in all study *** observed forest encroachment may be a legacy from earlier land-use:due to ceased or reduced grazing pressure,forests are invading grasslands until the potential forest cover allowed by climate and soil is *** number of forest patches significantly increased at one site(Fülöpháza),while it decreased at two sites(Bugac and Orgovány)and showed no significant change at the fourth site(Tázlár).This indicates that forest encroachment can happen at least in two different ways:through the emergence of new forest patches in the grassland,and through the extension and coalescence of already existing forest *** the present work revealed increasing tree cover at a decadal time scale,the dynamic process should be monitored in the future to see how the vegetation reacts to further *** could help devise a conservation strategy,as the woody/non-woody balance has a profound influence on basic ecosystem properties.

关键词： forest-grassland dynamics grazing semi-open ecosystems tree-grass ecosystems woody-herbaceous ecosystems

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