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[1]LI Changbin,PENG Yunfeng,ZHAO Dianzhi,et al.Effects of Precipitation Change and Nitrogen Addition on Community Structure and Plant Diversity in an Alpine Steppe on the Qinghai-Tibetan Plateau[J].Research of Soil and Water Conservation,2016,23(06):185-191.

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Effects of Precipitation Change and Nitrogen Addition on Community Structure and Plant Diversity in an Alpine Steppe on the Qinghai-Tibetan Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 06 Page number: 185-191 Column: Public date: 2016-12-28

Title:: Effects of Precipitation Change and Nitrogen Addition on Community Structure and Plant Diversity in an Alpine Steppe on the Qinghai-Tibetan Plateau

Author(s):: LI Changbin^1,5, PENG Yunfeng³, ZHAO Dianzhi⁴, NING Yi^1,5, ZHOU Guoying^1,2; 1. Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xi’ning 810008, China;
2. Key Laboratory of Tibetan Medicine Research, Chinese Academy of Sciences, Xi’ning 810008, China;
3. Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
4. Sanjiaocheng Sheep Breeding Farm of Qinghai Province, Gangcha, Qinghai 812300, China;
5. University of Chinese Academy of Sciences, Beijing 100049, China

Keywords:: Qinghai-Tibetan Plateau; community structure; species diversity; precipitation change; nitrogen addition; alpine steppe

CLC:: Q948.15⁺5

DOI:: -

Abstract:: Responses of species composition and richness to global change remain a major uncertainty in alpine grassland. Here we performed a three-year manipulative experiment to examine the changes of community structure and species richness under three precipitation regimes (doubled, control and halved) and two nitrogen (N) addition rates[0 and 10 g/(m²·year)] in an alpine steppe on the Qinghai-Tibetan Plateau. The main results are as follows. (1) N addition significantly reduced species richness from 24, 25, 21 to 21, 21, 20 along the precipitation gradient. (2) N addition and precipitation treatments significantly influenced community cover, which increased with N addition and increase of precipitation. Meanwhile, precipitation also interacted with year to affect community cover, following the trend 2015 > 2014 > 2013 across the three precipitation gradient. (3) The Simpson index, Shannon-Wiener index and Pielou index varied significantly among years. N treatment substantially altered richness index, while changing precipitation regime had significant effect on Pielou evenness. Overall, N addition had significant influence on species composition, community coverage and richness index in this alpine steppe, while precipitation only influenced on coverage. Except that changing precipitation altered Pielou index, both precipitation changes and N addition had minor contributions to diversity index.

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