生态环境学报Issue(5)：762-768,7.
半干旱区人工封育草场植被群落生态位研究--以宁夏盐池县长期定位监测点为例
Vegetation niche of enclosed grassland in semi-arid area--Taking Yanchi of Ningxia as an example
摘要
Abstract
Artificial enclosure is one of the major restoration measures in degraded grassland. In order to find the vegetation niche of enclosed desertification rangeland in semi-arid area, this paper studied the three different treatments (long-term complete enclosure; short-term complete enclosure; short-term incomplete enclosure) in enclosure area which located in Yanchi County of Ningxia. The enclosure area has been divided into the long-term complete enclosure region (E zone), short-term complete enclosure region (E1 zone) and short-term incomplete enclosure region (E2 zone). By analyzing the Levins niche breadth index and Pianka niche overlapping index of 27 kinds of plants in this area, reveal the variation law of plants niche in the arid desert environment, and provide the basis for further analysis of community stability in this region. The results showed that: 1) The niche breadth ofSalsola ruthenica lljin was the biggest in both E zone and E2 zone, which were respectively 0.832 and 0.810. While the dominate species in E1 zone was Lxeris chinensis var.graminifolia, the niche breadth was 0.742. It was their own biological characteristics that decided they can adapt the environment very well in enclosed area, and use the resources of enclosure region very well. The result was that their niche breadth was significantly higher than other species. 2) The analysis of the different plants' niche breadth in three areas revealed that: in terms of community stability, E2 zone was worse than E1 zone, and better than E zone. The long-term fencing enclosure was unfavorable for community stability. While short-term complete enclosure was more beneficial for community stability than incomplete enclosure. 3) By analyzing niche overlapping between different plants species in three areas drawn, the maximum niche overlapping value in E area appeared between Saussurea amara,Sophora alopecuroides L,Agropyron mongolicum Kengand Artemisia hedinii, both were 0.98. The maximum value in E1 area was betweenLespedeza davurica andAstragalus melilotoides (0.82), in E2 area was betweenAstragalus melilotoides andAgropyron cristatum(0.99). Correlation analysis showed that there was no clear linear relationship between niche breadth and niche overlapping. There may have narrow niche overlapping between narrow niche breadths species, the opposite is low, but not exactly so.关键词
封育/草原植被/生态位宽度/生态位重叠/半干旱区/群落稳定性Key words
enclosure/grassland vegetation/niche breadth/niche overlapping/semi arid region/community stability分类
农业科技引用本文复制引用
刘建康,张克斌,王黎黎,王志述,王冠琪..半干旱区人工封育草场植被群落生态位研究--以宁夏盐池县长期定位监测点为例[J].生态环境学报,2014,(5):762-768,7.基金项目
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” （）
