宁夏盐池人工封育荒漠化草原植物生态位研究  

The plants niches of enclosed desertificated grassland in Yanchi of Ningxia

作　　者：刘建[1] 张克斌[1] 程中秋[1] 孟力猛[1] 

机构地区：[1]北京林业大学水土保持学院,北京100083

出　　处：《干旱区资源与环境》2012年第1期184-188,共5页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金项目（30771764）; 国家林业局宁夏盐池荒漠化定位监测项目资助

摘　　要：运用Levins生态位宽度指数及Pianka生态位重叠指数,对宁夏盐池人工封育荒漠化草原2008和2009年植物生态位宽度及生态位重叠进行计量,以了解干旱半干旱区草原植物生态位格局。结果表明：黑沙蒿生态位宽度在2008、2009两年中均最大,分别为0.543、0.497,是人工封育区的优势种。此外,两年间封育区其他优势种也相同,分别为：苦豆子、丝叶山苦荬、刺沙蓬、阿尔泰狗娃花。2008和2009年的生态位重叠计测结果均表明,生态位宽度大的物种不一定和其他物种有大的重叠指数,即使是生态位宽度较大的物种之间的重叠指数也不高,可见较高的生态位宽度和较高的生态位重叠度之间并不存在直接的线性关系;2008、2009年较高的Pianka生态位重叠指数都出现在生态位宽度较小的物种之间,这一现象从另外一个角度说明植被恢复过程中环境资源存在着高度的空间异质性。In order to understand the pattern of plants niches in arid and semi-arid grassland in 2008 and 2009,the niche breadth and niche overlap were measured using Levins index and Pianka index in enclosed area of Yanchi county,Ningxia Hui Nationality Autonomous Region.The results showed that the niche breadth of Artemisia ordosica Krasch.were both the biggest in the two years of 08 and 09,which were 0.543 and 0.497.It＇s the dominant species in the enclosed area.Besides,other dominant species in the two years were same.They were Sophora alopecuroides Linn.,Ixeris chinensis（Thunb.） Nakai.,Salsola ruthenica IIjin.and Heteropappus altaicus（Willd.） Novopokr..The results of niche overlap showed that the species having big niche breadth didn＇t have big niche overlap with other species,even the niche overlap between the species which had big niche breadth were not big,so the niche breadth didn＇t have directly linear relation with niche overlap.The relatively bigger niche overlap in 08 and 09 appeared between the species with low niche breadth,which showed another viewpoint that environment and resources had high spatial heterogeneity during the process of vegetation restoration.

关 键 词：封育区 荒漠化草原 生态位宽度 生态位重叠 盐池 

分 类 号：Q948.1[生物学—植物学]