摘要
采用以空间序列代替时间序列的方法,运用Levins生态位宽度指数和Pianka生态位重叠指数及生态位相似比例,对伊犁绢蒿荒漠草地不同退化梯度间种群生态位宽度,生态位重叠与生态位相似比例进行一系列研究。结果表明,在不同退化梯度下,不同种群的生态位不同。随着退化演替的增强,建群种伊犁绢蒿(Seriphidium transiliense)及优势种叉毛蓬(Petrosimonia sibirica)的生态位宽度减少,其余大部分种群生态位宽度增大。在不同退化阶段叉毛蓬生态位宽度大于其他物种,且与弯果胡卢巴(Trigonella arcuata)物种间有较大的生态位重叠。在不同退化阶段,伊犁郁金香(Tulipa iliensis)与弯果胡卢巴生态位相似比例较高。随着退化演替的增强,生态位宽度较高的叉毛蓬和弯果胡卢巴的相似比值先增高后降低。
With the methods of space series substituting time series and of contrastive analysis, the niches of different degeneration gradients on desert Seriphidium transiliense degradation grassland were studied. The importance value, Levins niche breadth, Pianka niche overlapping indexes and niche similarity ratio were analyzed. With different degeneration gradients, the ecological niche was different in different popu- lations. The niche width of constructive species of S. transiliense and the dominant species Petrosimonia sibirica decreased and that of the majority of remaining population was gradually increasing during the pro- gress of the retrogressive succession. In different degradation stages, the niche breadth of P. sibirica is greater than the other species and there is large niche overlap between P. sibirica species and Trigonella arcuata species~ Tulipa iliensis and T. arcuata have high niche similarity. During the progress of the ret- rogressive succession, the similarity ratio of P. sibirica and T. arcuata have higher niche breadth increased at the early stage and then reduce afterwards.
出处
《草业科学》
CAS
CSCD
北大核心
2013年第12期2059-2065,共7页
Pratacultural Science
基金
新疆草地资源与生态重点实验室开放课题(XJDX0209-2009-02)
新疆维吾尔自治区教育厅重点项目(XJEDU2011I21)
关键词
伊犁绢蒿
生态位宽度
生态位重叠
生态位相似比例
Seriphidium transiliens
niche breadth
niche overlap
niche similarity proportion
