陕北黄土区自然恢复植物群落优势种种间关系研究  

Interspecific Relationships for Dominant Species in the Plant Community of Natural Recovery in North Shaanxi Loess Area,China

作　　者：陈文思[1] 朱清科[1] 卢纪元 王瑜[1] 王利娜[1] 

机构地区：[1]北京林业大学,北京100083

出　　处：《植物研究》2016年第4期520-526,共7页Bulletin of Botanical Research

基　　金：国家"十三五"科技支撑计划项目"困难立地植被恢复技术研究与示范"(2015BAD07B02)~~

摘　　要：从优势种种间关系入手,探索陕北黄土区自然恢复植物群落机理为近自然造林植物配置提供理论依据。基于2×2列联表,采用W检验、X^2检验、联结系数AC及共同出现百分率PC方法,对陕北自然恢复15年的植物群落优势种种间关系进行分析研究。该植物群落总体联结性VR(方差比率)>1,统计量W>X_(0.05)~2(N),说明该植物群落总体种间表现出正关联,且达到显著水平。20个优势种种间联结性的分析结果表明,正关联种对的数量(114)多于负关联种对(75),无关联种对为1,且联结程度呈极显著和显著的种对数所占比例较小;种对间的正负关联性一定程度上反映了植物之间生态位的重叠和分离。陕北黄土区植被自然恢复15年,大多数植物种的分布较为独立,群落仍处于演替之中。For providing the theoretical basis for the plant configuration of close-to-nature afforestation in the north Shaanxi loess area, China, we explored the mechanism of natural restoration of plant community based on interspecific association. We studied the interspecific relationships of dominant species in the plant community, which had been naturally restored for 15 years in north Shaanxi loess area, on the basis of 2 x 2 contingency table and a series of techniques, including W-test, X2-test, association coefficient（AC） and percentage of co- occurrence（PC）. The overall community association of variance ration was greater than 1, and the statistic W was more than X02.05 （N）, indicating that the species in the total community were positively associated significantly. The number of pairs of species with positive correlation was larger than that of negative correlation, but the proportion of significant and very significant pairs of species were very small. The positive and negative correlations between species-pairs were the indication of niche overlap and separation. Vegetation in north Shaanxi loess area having been naturally recovered for 15 years, most plant species tended to be independent and randomly related with each other, and this plant community was still in succession.

关 键 词：陕北黄土区 自然恢复 优势种 种间联结性 

分 类 号：Q948[生物学—植物学]