[1]李长斌,彭云峰,赵殿智,等.降水变化和氮素添加对青藏高原高寒草原群落结构和物种多样性的影响[J].水土保持研究,2016,23(06):185-191.
 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].,2016,23(06):185-191.
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降水变化和氮素添加对青藏高原高寒草原群落结构和物种多样性的影响()
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《水土保持研究》[ISSN:1005-3409/CN:61-1272/P]

卷:
23卷
期数:
2016年06期
页码:
185-191
栏目:
出版日期:
2016-12-28

文章信息/Info

Title:
Effects of Precipitation Change and Nitrogen Addition on Community Structure and Plant Diversity in an Alpine Steppe on the Qinghai-Tibetan Plateau
作者:
李长斌15 彭云峰3 赵殿智4 宁祎15 周国英12
1. 中国科学院 西北高原生物研究所, 西宁 810008;
2. 中国科学院 藏药研究重点实验室, 西宁 810008;
3. 中国科学院 植物研究所, 北京 100093;
4. 青海省三角城种羊场, 青海 刚察 812300;
5. 中国科学院大学, 北京 100049
Author(s):
LI Changbin15 PENG Yunfeng3 ZHAO Dianzhi4 NING Yi15 ZHOU Guoying12
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
关键词:
青藏高原群落结构物种多样性降水变化氮素添加高寒草原
Keywords:
Qinghai-Tibetan Plateaucommunity structurespecies diversityprecipitation changenitrogen additionalpine steppe
分类号:
Q948.15+5
摘要:
全球变化对草地物种组成和物种多样性有显著影响,而高寒草原研究较少。以青藏高原紫花针茅高寒草原为对象,通过三年的野外小区完全随机试验,模拟分析了降水变化和氮素添加对物种群落结构和物种多样性的影响,降雨水平设置减少50%降雨、对照和增加50%降雨3个水分处理,氮添加设置对照和加氮2个水平。结果显示:(1)氮添加后随降雨梯度递增分别导致物种数由24,25,21减少到21,21,20。(2)年际变化、水分和氮素处理对群落盖度影响显著,年际变化和水分处理交互效应显著。群落盖度2015年> 2014年> 2013年;随着降雨梯度递增,群落盖度呈增加趋势;添加氮素处理的群落盖度显著高于对照。(3)种丰富度、Simpson指数、Shannon-Wiener指数、Pielou指数在年际间有显著差异,另外,氮素处理显著影响丰富度指数,Pielou指数在不同降水处理间差异显著。氮素添加显著影响青藏高原高寒草原物种组成、群落盖度以及丰富度指数,而降水作用只影响群落盖度;降水变化除了对Pielou指数有影响外,降水变化和氮素添加均不影响多样性指数。
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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备注/Memo

备注/Memo:
收稿日期:2015-12-25;改回日期:2016-01-07。
基金项目:国家重点基础研究发展计划项目(2012CB026105);国家科技支撑计划项目(2014BAC05B01);国家自然科学基金(40801076)
作者简介:李长斌(1990-),男,青海西宁人,在读研究生,主要研究方向:草地生态学。E-mail:lichangbin900912@126.com
通讯作者:周国英(1974-),男,青海乐都人,研究员,主要研究方向:生态学。E-mail:zhougy@nwipb.cas.cn
更新日期/Last Update: 1900-01-01