干旱区生态环境知识资源中心(Arid): 短花针茅荒漠草原alpha多样性对绵羊载畜率的响应

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	短花针茅荒漠草原alpha多样性对绵羊载畜率的响应
其他题名	The response of plant alpha diversity to different grazer stocking rate in a Stipa breviflora. desert steppe
	张睿洋; 王忠武; 韩国栋; 潘占磊; 刘芳; 武倩; 阿木尔萨那
来源期刊	生态学报
ISSN	1000-0933
出版年	2017
卷号	37 期号:3 页码:906-914
中文摘要	以短花针茅(Stipa breviflora)荒漠草原为研究对象,采用巢式样方法分析在不同绵羊载畜率下草地的alpha多样性以及物种组成的变化,探讨荒漠草原生态系统在放牧利用下alpha多样性对载畜率的响应。结果表明:物种数和alpha多样性指数随着载畜率的升高而下降。放牧会减少群落非优势物种的相对多度,非优势物种能够反映alpha多样性。40 m~2为短花针茅荒漠草原多样性研究的最佳取样面积。种-面积关系以及alpha多样性指数-面积关系符合对数增长模型:y = alphaln(x)+6。随着取样面积尺度的增加,alpha 多样性指数沿载畜率梯度差异性逐渐增大,在取样面积为0.16 m~2到0.64 m~2时可以体现中、高载畜率和零、低载畜率水平间的差异性,在160 m~2时可以体现各载畜率水平之间的差异显著性。
英文摘要	Plant diversity is a crucial component of biodiversity, and it has attracted growing attention in recent years. For desert steppes, however, how grazing and the sample area used in these studies affect species diversity, and through what mechanisms, is still unclear. Stipa breviflora grasslands typically represent desert steppes, which in turn occupy a special place among the grassland ecosystems. In this study, a long-term (11 years) grazing experiment with four levels of grazer stocking rate in the S. breviflora desert steppe in Siziwang Banner of Inner Mongolia was used. The study aims to provide a scientific basis for grassland biodiversity protection and sustainable development, and therefore explored the influence of different grazer stocking rates on plant diversity (using four alpha diversity indexes: the Margalef, Shannon-Wiener, Simpson,and Pielou index). Grassland alpha diversity and species composition change was assessed for different stocking rates, and the sample area sizes (from 0.01 m~2 to 650 m~2) were analyzed to determine the optimal sampling area for this desert grassland.The results showed that: (1) The number of species and alpha diversity indices declined with increasing stocking rate. (2) Compared with the relative density of the dominant species (e. g. S. breviflora and Cleistogenes songorica),grazing reduced the relative density of non-dominant species. Dominant species have a strong adaptability and endurance, whereas non-dominant species have a sensitive response to grazing. Moreover, a decrease in non-dominant species resulted in a lower alpha diversity index. This suggests that non-dominant species are important indicators that reflect how plant species respond to grazer stocking rate changes, and underline the variety in adaptive strategies for resources changes. (3) The best sampling area size to investigate the species number and alpha diversity was 40 m~2. (4) The species-area relations and alpha diversity index-area relations both conformed to a logarithmic growth model. (5) Sampling area influenced the analyses of the different alpha diversity indices. With increasing scale area,the differences among the alpha diversity indices increased gradually with stocking rate gradients. Sampling areas between 0.16 m~2 to 0.64 m~2(small scale) detected significant different levels of alpha diversity indices between zero and low,and moderate and high stocking rate levels. However, sampling areas larger than 160 m~2 (large scales) could detect significant differences in alpha diversity indices among high and all stocking rate levels over the sampling area.
中文关键词	短花针茅 ; 荒漠草原 ; alpha多样性 ; 载畜率 ; 取样面积 ; Margalef指数 ; Shanon-Wiener指数 ; Simpson指数 ; Pielou指数 ; 四子王旗
英文关键词	Stipa breviflora. desert steppe alpha diversity stocking rate sampling area Margalef index Shannon-Wiener index Simpson index Pielou index Siziwang Banner
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:5924601
来源机构	内蒙古农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236442
作者单位	内蒙古农业大学生态环境学院, 呼和浩特, 内蒙古 010018, 中国
推荐引用方式 GB/T 7714	张睿洋,王忠武,韩国栋,等. 短花针茅荒漠草原alpha多样性对绵羊载畜率的响应[J]. 内蒙古农业大学,2017,37(3):906-914.
APA	张睿洋.,王忠武.,韩国栋.,潘占磊.,刘芳.,...&阿木尔萨那.(2017).短花针茅荒漠草原alpha多样性对绵羊载畜率的响应.生态学报,37(3),906-914.
MLA	张睿洋,et al."短花针茅荒漠草原alpha多样性对绵羊载畜率的响应".生态学报 37.3(2017):906-914.