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《Acta Botanica Boreali-Occidentalia Sinica》 2017-07
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Niche and Interspecific Association of Dominant Species in Tree Layer of Chishui AlsophilaspinulosaCommunity

LI Qiulin;ZONG Xiuhong;DENG Hongping;WAN Haixia;WU Hongying;LIANG Sheng;LIU Bangyou;Key Laboratory of Eco-Environments in Three Gorges Reservoir Region (Ministry of Education),School of Life Science,Southwest University;Chishui Alsophila National Nature Reserve Administration;  
Chishui Alsophila National Nature Reserve regards Alsophila spinulosa as the protective object.According to the field investigation of A.spinulosa community in the reserve,methods including niche breadth,niche overlap,variance ratio,chi-square test and association coefficient(AC)based on 2×2contingency table were used for analyzing the interaction between the species population.The results show that:(1)Phyllostachys heterocycla has the largest niche breadth,followed by A.spinulosaand Mallotusbarbatus.(2)The niche overlap of Pinus massonianaand Vernicia fordii,Cunninghamia lanceolata,Musa basjoo and Melliodendron xylocarpum are larger than that of other populations.(3)The overall correlations of 14 dominant species in tree layers showed non-significant negative correlation.The chi-square test showed that the association between A.spinulosa and other populations was not significant.Only a few species pairs of the community had a significant association,90.10% of species pairs did not reach a significant level.Most of the AC,OI,JI values are not high,the correlations between species pairs are weak,and species are relatively strong independence.The negative association of the community was more than positive association,and the community is in the unstable stage of dynamic succession.(4)The analysis of the relationship between the association of species and the corresponding niche overlap showed that there was a positive correlation between them.The stronger the interspecific association,the greater the niche overlap.The stronger the negative association,the smaller the niche overlap.
【Key Words】: Alsophila spinulosa community tree layer Niche interspecific association
【Fund】: 科技部国家科技基础平台国家标本平台——教学标本子平台运行服务资助项目(2005DKA21403-JK);; 环保部生物多样性保护及监测项目:赤水桫椤国家级自然保护区生物多样性野外监测示范(2015)
【CateGory Index】: S718.5
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