Effects of Gradient Warming on Species Diversity and Biomass in Alpine Meadows
MA Li1,4, ZHANG Qian1,4, ZHANG Zhong-hua1,4, GUO Jing1,4, YANG Xiao-yuan1,4, ZHOU Bing-rong2, DENG Yan-fang3, WANG Fang1, SHE Yan-di1,4, ZHOU Hua-kun1
1. Northwest Plateau Institute of Biology, Chinese Academy of Sciences, Key Laboratory of Cold Regions Restoration Ecology, Xining, Qinghai Province 810001, China; 2. The Qinghai Institute of Meteorological Science, Xining, Qinghai Province 810001, China; 3. Qinghai forestry and grassland administration, Qinghai Province 810008, China; 4. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：In this study,we took the alpine meadow on Qinghai-Tibet Plateau as the research object,and the effects of four gradient warming treatments on species diversity and biomass were investigated by using Open-Top-Chambers (OTCs).The results showed that:the community coverage decreased significantly under high temperature treatment (P<0.05). The Simpson index,Shannon index and Pielou index under low temperature treatment were significantly lower than those under control condition (P<0.05). Aboveground biomass and total biomass decreased significantly under high temperature treatment (P<0.05). The underground biomass at 10~20 cm soil layer increased significantly under high temperature treatment (P<0.05),at 0~10 cm decreased the most under high temperature treatment,at 20~30 cm increased the most under low temperature treatment. This study shows that species richness was not sensitive to gradient warming during the study period,high temperature treatment reduces the accumulation of aboveground biomass,and underground biomass has no significant change regularity under different gradient warming treatment,so the response of underground biomass to gradient warming was not sensitive.
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2020, Vol. 28 
