Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2020, Vol. 28 ›› Issue (5): 1395-1402.DOI: 10.11733/j.issn.1007-0435.2020.05.026

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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. 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
  • Received:2020-06-01 Revised:2020-06-23 Published:2020-09-19

梯度增温对高寒草甸物种多样性和生物量的影响

马丽1,4, 张骞1,4, 张中华1,4, 郭婧1,4, 杨晓渊1,4, 周秉荣2, 邓艳芳3, 王芳1, 佘延娣1,4, 周华坤1   

  1. 1. 中国科学院西北高原生物研究所, 青海省寒区恢复生态学重点实验室, 青海 西宁 810001;
    2. 青海省气象科学研究所, 青海 西宁 810001;
    3. 青海省林草局, 青海 西宁 810008;
    4. 中国科学院大学, 北京 100049
  • 通讯作者: 周华坤
  • 作者简介:马丽(1992-),女,山西太原人,博士研究生,主要从事全球变化生态学和植物生态学研究,E-mail:mali@nwipn.cas.cn
  • 基金资助:
    国家重点研发计划课题（2016YFC0501901）；国家自然科学基金面上项目（31672475）；青海省自然科学基金面上项目（2019-ZJ-908）；中科院先导专项（XDA2005010405）；第二次青藏高原综合科学考察研究项目“草地生态系统与生态畜牧业”（2019QZKK0302）；青海省重大科技专项（2019-SF-A12）；青海省“高端创新人才千人计划”项目资助

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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.

Key words: OTC, Gradient warming, Alpine meadow, Species diversity, Biomass

摘要： 本研究以青藏高原高寒草甸为试验对象，利用开顶室增温装置（Open-Top-Chambers，OTCs），探讨4种增温幅度对物种多样性和生物量的影响。结果表明：群落盖度在高度增温下显著减少（P<0.05）；低度增温下的Simpson指数、Shannon指数和Pielou指数显著低于对照处理（P<0.05）；地上生物量与总生物量在高度增温下显著减少（P<0.05）；10~20 cm处地下生物量在高度增温下显著增加（P<0.05），0~10 cm处地下生物量在高度增温下下减幅最大，20~30 cm处地下生物量在低度增温下增幅最大。本研究表明，在研究周期内物种丰富度对梯度增温响应不敏感，高度增温减少地上生物量的积累，地下生物量在不同幅度的增温处理下没有显著的变化规律性，响应并不敏感。

关键词: OTC, 增温梯度, 高寒草甸, 物种多样性, 生物量

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