云南苍山火烧迹地不同恢复期地表蜘蛛群落多样性

Abstract

We investigated dynamics of ground-dwelling spider diversity after fire in mixed broadleaf-conifer forest in Cangshan Mountain,Yunnan Province.Sampling of ground-dwelling spider diversity was carried out in six sites(2,10,18,23 and 33 years after fire,and one unburned site) from January 2009 to December 2009,based on a 'space-for-time substitution' sampling by pitfall trap.We found that(1) species composition and relative abundance changed dramatically across the six different fire succession sites;(2) the abundance of ground-dwelling spider in the 10 year site times was significantly higher than other sites,and there was no significant difference in species richness among the six sites;(3) ground-dwelling spider community succession could be divided into 3 stages by PCoA analysis: 2 years after fire,10 years after fire,18-33 years after fire;(4) Indicator Species Analysis base on R language package 'labdsv' show: Sibianor sp.1 et al.was the indicator of first stage,Lycosa graham et al.was the indicator of second stage,Xysticus sp.2 et al.was the indicator of third stage,Leptoneta sp.1 et al.was the indicator of control.Fire disturbance and subsequent succession changed the ground-dwelling spider community.The habitat selection of indicator could indicate the variability of different restorations post-fire forest.The ground spider community in the oldest of the burned sited does not yet resemble the community in the unburned site indicating that the restoration of the ground spider community for Cangshan Mountain takes longer than three decades.