生物土壤结皮对全球气候变化的响应

Responses of biological soil crusts(BSC) from arid-semiarid habitats and polar region to global climate change

生物土壤结皮在干旱、半干旱区和极地、亚极地区等脆弱生态区广泛存在,生物土壤结皮对脆弱生态系统的稳定、碳氮循环和生态平衡等具有重要的生态意义。概述了脆弱生态区生物结皮的碳氮循环与气候变化关系,综合分析了脆弱生态区生物结皮对气候变暖、降水变化和UV-B增加的响应。分析认为应该加强区域尺度下干旱与半旱区生物结皮对气候变化响应研究。

Biological soil crusts（BSC）are a universal and common feature in arid-semiarid habitats and polar regions.They contribute to the biodiversity of these ecosystems,and play significant roles in soil stability,ecosystem stability maintenance,nitrogen fixation,biomass production,and soil fertility.It was described that succession development of BSC＇s different successional age and distribution of BSC in different areas.Responses of BSC to elevated UV-B radiation,climate warming and rainfall variation were separately introduced.It is prospected that making progress in research of BSC responses to climate changing,especially arid and semi-arid regions,at regional scale.