Species Richness and Diversity of Alpine Grasslands on the Northern Tibetan Plateau: Effects of Grazing Exclusion and Growing Season Precipitation.
Species Richness and Diversity of Alpine Grasslands on the Northern Tibetan Plateau: Effects of Grazing Exclusion and Growing Season Precipitation.
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DOI：
10.5814/j.issn
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发表时间：
2012-10
期刊：
影响因子：
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通讯作者：
Wu Jianshuang;Zhang Xianzhou;Shen Zhenxi;Shi Peili;Y. Chengqun;Song Minghua;Liu Xiaojia
中科院分区：
文献类型：
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作者：
Wu Jianshuang;Zhang Xianzhou;Shen Zhenxi;Shi Peili;Y. Chengqun;Song Minghua;Liu Xiaojia
摘要：2009 - 2010年夏季，对北方高原高寒草地样带（高寒草甸、高寒草原和荒漠草原）禁牧和自由放牧条件下的物种丰富度和多样性指数（Shannon-Wiener指数、Simpson优势度指数和Pielou均匀度指数）进行了研究。我们发现，自2006年以来，在植被和区域尺度上，物种丰富度和多样性没有显着改变短期放牧排除。物种丰富度和多样性主要由生长季降水（GSP）驱动，占观察到的总变化的87%以上。物种丰富度和多样性在grazingexcluded和自由放牧的网站出现响应生长季节降水平行。物种丰富度与GSP呈指数增长，多样性指数与GSP呈线性正相关。这表明，青藏高原北方的GSP在调节物种丰富度和多样性方面起着重要作用，在今后的高寒草地保护研究中应予以考虑。
Abstract: Species richness and diversity indices (Shannon-Wiener index, Simpson dominance index and Pielou evenness index) in alpine grassland ecosystems (alpine meadow, alpine steppe and desert steppe) under grazing—excluded and freely grazed sites were investigated along the Northern Tibetan Plateau Alpine Grassland Transect during summer 2009 and 2010. We found that species richness and diversity have not been significantly altered by short—term grazing exclusion since 2006 at vegetation and regional scales. Species richness and diversity were mainly driven by growing season precipitation (GSP), which accounted for over 87 % of the total variation observed. Species richness and diversity at grazingexcluded and freely grazed sites appear to respond to growing season precipitation in parallel. Species richness exponentially increased with GSP while diversity indices showed positively linear relationships with GSP. This indicates that GSP on the Northern Tibetan Plateau is crucial in regulating species richness and diversity and should be taken into account in future studies on alpine grassland conservation.