不同演替阶段栎树混交林群落稳定性  

Stability of Platycladus orientalis mixed forest communities at different successional stages

作　　者：马洪婧[1] 李瑞霞[1] 袁发银[1] 史珑燕[1] 关庆伟[1] 

机构地区：[1]南京林业大学森林资源与环境学院,南京210037

出　　处：《生态学杂志》2013年第3期558-562,共5页Chinese Journal of Ecology

基　　金：国家林业公益性行业科研项目(201104075);国家重点基础研究发展计划专项(2012CB416904)资助

摘　　要：稳定性是群落结构与功能的一个综合指标,一直是生态学研究的重点。为进一步验证火山岩山地森林群落在不同演替阶段稳定性的变化趋势,本文以处于不同演替阶段的侧柏栎树混交林、栎树混交林和栎树黄连木混交林3种典型森林群落为对象,选取演替现状、物种多样性、Gordon稳定性值、群落结构4项指标10个因子作为构建评价模型的参数,通过函数隶属值方法评价了江苏盱眙火山岩山地典型森林群落在不同演替阶段的稳定性。结果表明:1)随着演替的进行,稳定性不断增强,与传统的演替理论一致,即演替是由不稳定到稳定的过程;2)3种群落总体的丰富度指数和Whittaker生境多样性指数虽存在一定的差异,但却表现出了相同的趋势,即栎树混交林>黄连木栎树混交林>侧柏栎树混交林;3)多样性最高的是栎树混交林,而稳定性最高的是侧柏栎树混交林,多样性并不能完全代表稳定性;4)由于侧柏栎树混交林密度过大,需要进行适当抚育,促进其正向演替。Stability is a comprehensive indicator of community structure and function, and has been the focus of ecological research. To further understand the variation trend of the stability of volcanic rock mountain forest communities at different succession stages, three typical forest com- munities at different succession stages （Platycladus orientalis and Quercus variabilis mixed forest, P. orientalis mixed forest, and O. variabilis and Pistalia chinensis mixed forest） in a typical vol- canic rock mountainous region of Jiangsu Province, East China were taken as the study objects, four indicators （population regeneration, species diversity, Gordon stability value, and communi- ty structure） and eleven factors were chosen as the parameters to build an evaluation model, aimed to evaluate the stability of the communities by using the membership function values. With the development of succession, the stability of the forest communities was increasing, which was in line with the traditional succession theory, namely, the succession was from unstable to stable. Though the overall richness index and Whittaker＇ s diversity index of the three communities had definite differences, the two indices presented the same variation trend, i. e. , P. orientalis mixed forest 〉 Q. variabilis and P. chinensis mixed forest 〉 P. orientalis and Q. variabilis mixed forest. P. orientalis mixed forest had the highest diversity, while Q. variabilis and P. chinensis mixed forest had the highest stability, i. e. , the diversity could not fully represent the stability. The density of P. orientalis and Q. variabilis mixed forest was too large, and thus, appropriate tending should be made to promote the positive succession of the forest.

关 键 词：混交林 演替 群落多样性 群落稳定性 模糊综合评价 

分 类 号：Q948[生物学—植物学]