Distribution Pattern of Species Abundance in Bothriochloa ischaemun Community at Different Slope Positions in the Loess Gully Region, China
Analysis of species abundance（SA） is an important way to understand community structure and the underlying mechanism of community ecological processes.This paper analyzed the SA of Bothriochloa ischaemun L.Keng community at different slope positions in the Loess Gully Region of China.We fitted the SA with five niche models,including Zipf model,Zipf-mandelbrot model,niche preemption model（NPM）,broken stick model（BSM） and dominance preemption model（DPM）.We found out that：（1） indices of Shannon,Simpson and Patrick at the intermediate position of the slope were significantly smaller than the upland and lowland,whereas upland and lowland had no significant difference in terms of these indices;Evenness indices of Pielo（Jsw and Jsi） and Alatalo showed no difference among these slope positions;（2） Zipf model,Zipf-mandelbrot model described the species abundance distribution（SAD） pattern of Bothriochloa ischaemun L.Keng community well.All these results indicated that the community formation under different slope positions shared a similar mechanism,though its diversity indices varied among these slope positions.The results of this study confirmed that the Zipf model,Zipf-mandelbrot model can successfully reproduce the community SAD at the later succession stage.
loess gully regionslope positionsBothriochloa ischaemun L. Kengpecies abundance distributionniche model
国家科技期刊平台
NSTL
万方数据
维普
