秦岭西段典型森林群落灌木层优势种群生态位与种间联结  

Niche and interspecific association of dominant species in shrub layers of typical forest communities in the western part of the Qinling Mountains

作　　者：胡宁宁 崔雨昕 孙萌 康冰[1] HU Ningning;CUI Yuxin;SUN Meng;KANG Bing(College of Life Sciences,Northwest A&F University,Yangling 712100,Shaanxi,China)

机构地区：[1]西北农林科技大学生命科学学院,陕西杨凌712100

出　　处：《生态学杂志》2024年第12期3595-3604,共10页Chinese Journal of Ecology

基　　金：2022年中央财政林业国家级自然保护区补助资金项目(20220135)资助。

摘　　要：研究森林群落灌木层优势种群生态位特征和种间关系,可为森林资源保护与管理提供科学依据。本研究以秦岭西段典型森林群落灌木层优势种群为对象,通过Levins生态位宽度、Shannon生态位宽度与Levins生态位重叠指数表征生态位特征,运用方差比率法,以χ^(2)检验为主,结合联结系数AC、Pearson相关检验进行种间关系分析。结果表明:秦岭西段典型森林群落灌木层20个优势种群形成的190个种对中,生态位宽度最大的为苦糖果,最小的为榛。生态位重叠均值为0.32,生态位重叠较小的种对占多数,说明灌木层优势种群间分化程度高,有利于形成物种多样性;灌木层优势种群总体呈显著正联结,表明秦岭西段典型森林群落处于演替后期的相对稳定阶段。χ^(2)检验、Pearson相关检验正负联结比均大于1,且不显著种对占多数,物种间呈独立分布格局。生态位重叠指数与联结系数AC、Pearson相关系数呈极显著正相关。Understanding niche characteristics and interspecific relationships of dominant populations in the shrub layer of forest communities can provide scientific basis for the conservation and management of forest resource.In this study,we characterized the niche of the dominant species of shrub layer in typical forest communities in the western part of the Qinling Mountains by Levins niche breadth,Shannon niche breadth and Levins niche overlap indices.The interspecific relationships were analyzed by using the variance ratio method,x?test,association coefficient(AC),and Pearson correlation test.The results showed that among 190 species pairs formed by the 20 dominant species in the shrub layer,Lonicera fragrantissima had the largest niche breadth and Corylus heterophylla was the smallest.The mean value of niche overlap was 0.32.Species pairs with small niche overlap were predominated,indicating a high degree of differentiation among the dominant species in the shrub layer,which was conducive to the formation of species diversity.The dominant populations in the shrub layer showed significant positive associations,indicating that forest communities were in a relatively stable stage of late succession.The results of both x?test and Pearson correlation test showed that the positive and negative association ratios were greater than 1,and the majority of species pairs were non-significant associations,indicating an independent distribution pattern among species.The niche overlap index was positively correlated with the association coefficient(AC)and Pearson correlation coefficient.

关 键 词：种对 种间关系 灌木层 天然林 秦岭西段 

分 类 号：S718.54[农业科学—林学]