不同退化程度下川滇高山栎群落土壤种子库特征研究.doc

不同退化程度下川滇高山栎群落土壤种子库特征研究
摘要:物种组成和种子密度是一个种子库的基本特征。对不同退化程度下川滇高山栎森林群落土壤种子库的物种组成、密度、多样性进行了比较及分析,并探讨了地上植被与土壤种子库间的相似性关系。结果显示:(1)轻度退化下土壤种子库储量密度为(412±64)粒/m2,显著高于中度退化、重度退化、极度退化土壤种子库储量;(2)Shannon-wiener指数、Margalef丰富度指数为:轻度退化、中度退化、重度退化、极度退化:(3)轻度退化和中度退化下土壤种子库物种相似性较高,重度退化和极度退化下相似性较低,表现为随着生境条件的转好,其相似性指数增高。
关键词:川滇高山栎群落;不同退化程度;土壤种子库
中图分类号 S714 文献标识码 A 文章编号 1007-7731(2013)14-25-03
Characteristics of Soil Seed Bank under Different Degradation Degree of Quercus munity
Zeng Jiaqin et al.
(College of Resource and Environment,Agriculture and Animal Husbandry College,Tibet University,Nyingchi 860000,China)
Abstract:position and seed density is the basic feature of a seed bank. This study was performed pare the p
osition,density and diversity of soil seed bank under different degradation degree of quercus munity. The relationship between standing vegetation and seed banks was results were as follows: (1) the average seed storage of seed banks in lightly degraded was(412±64)grain/m2,which was much higher than those in moderate degradation,severe degradation,extreme degradation;(2) Shannon-Wiener index and Margalef index of lightly degraded were the highest,followed by moderate degradation,severe degradation,extreme degradation;(3) Similarity coefficient of soil seed banks between lightly degraded and moderate degradation was higher,while the coefficient was lower betwe