| 藏北高寒草地样带物种多样性沿降水梯度的分布格局 |
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| 引用本文： | 武建双,李晓佳,沈振西,张宪洲,石培礼,余成群,王景升,周宇庭.藏北高寒草地样带物种多样性沿降水梯度的分布格局[J].草业学报,2012,21(3):17-25. |
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| 作者姓名： | 武建双 李晓佳 沈振西 张宪洲 石培礼 余成群 王景升 周宇庭 |
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| 作者单位： | 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室拉萨高原生态试验站,北京100101;中国科学院研究生院,北京100039;内蒙古师范大学地理科学学院,内蒙古呼和浩特,010022;中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室拉萨高原生态试验站,北京,100101 |
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| 基金项目： | 国家科技支撑攻关)计划项目，国家自然科学基金，中国科学院战略性先导科技专项 |
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| 摘 要： | 在藏北高原高寒草地样带上对４０个围栏内草地群落物种多样性和地上生物量进行测定，探讨了生长季降水对高寒草地生物量和物种多样性分布格局的影响以及地上生物量－物种多样性之间的关系模式。结果表明，降水格局显著地影响藏北高原内部高寒草地群落物种丰富度、多样性和均匀度，群落结构特征与初级生产力关系密切；藏北地区高寒草地地上生物量、物种丰富度、Ｓｈａｎｎｏｎ－Ｗｉｅｎｅｒ指数和Ｐｉｅｌｏｕ均匀度指数随生长季累积降水呈指数增加趋势；在高寒草地群落物种丰富度－生产力关系研究中单峰模式的判别系数R２（０．７５４）略高于线性回归模型（０．７４３）。沿藏北高原样带高寒草地物种丰富度随地上生物量单调递增，单峰模式的单调递减区间并未出现；然而单峰模型预示着在地上生物量高于１２１．１７ｇ／ｍ２ 的高寒草地群落物种丰富度可能随生物量单调递减，从而使物种丰富度－地上生物量表现为较为标准的单峰模式；Ｓｈａｎｎｏｎ－Ｗｉｅｎｅｒ多样性指数和Ｐｉｅｌｏｕ均匀度指数与地上生物量也均呈单峰模式，但其单调递减区间窄于单调递增区间，峰值分别对应的草地群落地上生物量为７１．９０和６０．９０ｇ／ｍ２。
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| 关 键 词： | 降水梯度 物种多样性 地上生物量 高寒草地 藏北高原样带 |
Species diversity distribution pattern of alpine grasslands communities along a precipitation gradient across Northern Tibetan Plateau |
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| WU Jian-shuang
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LI Xiao-jia
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SHEN Zhen-xi
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ZHANG Xian-zhou
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SHI Pei-li
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YU Cheng-qun
,
WANG Jing-sheng
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ZHOU Yu-ting.Species diversity distribution pattern of alpine grasslands communities along a precipitation gradient across Northern Tibetan Plateau[J].Acta Prataculturae Sinica,2012,21(3):17-25. |
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| Authors: | WU Jian-shuang LI Xiao-jia SHEN Zhen-xi ZHANG Xian-zhou SHI Pei-li YU Cheng-qun WANG Jing-sheng ZHOU Yu-ting |
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| Institution: | 1,2(1.Lhasa Plateau Ecosystem Research Station,Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Science and Natural Resources Research,Beijing 100101,China; 2.Graduate University of Chinese Academy of Science,Beijing 100049,China;3.College of Geographical Science,Inner Mongolia Normal University,Hohhot 010022,China) |
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| Abstract: | Aboveground biomass and community stricture at 40 sites with grazing exclusion were surveyed on a west-east alpine grassland transect along precipitation gradient in Northern Tibetan Plateau to evaluate effect of growing season rainfall on both aboveground biomass and species diversity and to discuss the relationship between aboveground biomass and species diversity indexes.The precipitation pattern significantly affected species richness,Shannon-Wiener diversity and Pielou evenness indexes of the alpine communities in inner Northern Tibetan Plateau and that community structure related closely with primary productivity.All of aboveground biomass,species richness,Shannon-Wiener diversity index and Pielou evenness index exponentially increased with growing season precipitation addition.In the relationship between species richness and aboveground biomass of alpine grasslands,the discriminant coefficient of the hump-shaped model(R2=0.754) was slightly higher than linear regression(R2=0.743),however,species richness monotonically increased with aboveground biomass of alpine grasslands along Northern Tibetan Plateau Transect without any monotonic decreasing interval in the hump-shaped model.Moreover,hump-shaped model in our results indicated that species richness more likely showed a monotonic decreasing with aboveground biomass when it was more than 121.17 g/m2 and to make this humped relationship to be standard.Hump-shaped models described both Shannon-Wiener biodiversity and Pielou evenness index with aboveground biomass that decreasing intervals were relatively narrower than increasing ones and peak values took place at aboveground biomass of 71.90 and 60.90 g/m2 respectively. |
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| Keywords: | precipitation gradient species diversity aboveground biomass alpine grasslands Northern Tibetan Plateau Transect |
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