山西农业大学学报（自然科学版）Issue(5)：504-508,5.
放牧和围封对赖草草地群落空间分布特征的影响
Effects of Grazing and Enclosure on Spatial Distribution Characteristics of Leymus secalinus Commu-nities
摘要
Abstract
The grassland of Leymus secalinus communities were taken as research object ,the spatial distribution pat‐terns and characteristics of main plant populations were investigated in grazed and enclosed plots after six‐year enclo‐sing with the help of the ground statistical analysis .Results showed that enclosure has significantly positive effects on vegetation cover ,height and the above‐ground biomass ,however ,it has significantly negative effects on dominance in‐dex and diversity index compared with those in grazed plots .The important values of component species of L .secalinus communities were changed in different degrees ,and the species‐abundance distribution pattern was log‐normal model and Zipf‐Mandelbrot model in grazed plot ,but the niche preemption model was the best‐fit model in enclosed plot .Spa‐tial variability of L .secalinus population caused by random factors such as selective feeding and trampling behavior of grazing animal in enclosed plot ,however ,structural factors cause the heterogeneous distribution of L .secalinus popu‐lation in grazing plot .According to our results ,the population of L .secalinus in enclosed area became more stable without interference .We suggest that the combination of the short‐term enclose and grazing was the effective way to maintain the biodiversity of salinization grasslands .关键词
放牧/围栏封育/物种-多度格局/空间异质性Key words
Grazing/Enclosure/Species-abundance distribution/Spatial heterogeneity分类
农业科技引用本文复制引用
任国华,张宾宾,张智袁,赵祥..放牧和围封对赖草草地群落空间分布特征的影响[J].山西农业大学学报（自然科学版）,2015,(5):504-508,5.基金项目
山西农业大学科技创新基金项目（2014014）；山西农业大学引进人才博士科研启动费项目 （）
