塔里木河上游天然胡杨林种群空间分布格局与动态研究

以新疆塔里木河上游阿瓦提县天然胡杨林为研究对象,采用相邻格子法进行实地调查,应用方差/均值比率法和5种聚集度指标研究了塔里木河上游天然胡杨林主要种群的空间分布格局与动态特征.结果显示:胡杨群落中除草本西北天冬种群空间分布格局呈随机分布外,其它主要种群均呈聚集分布;拟合检验表明,胡杨、灰叶胡杨种群为聚集分布.种群空间分布动态分析表明,灰叶胡杨在小树、中树与大树阶段均为聚集分布;胡杨种群在小树与中树阶段为聚集分布,但聚集强度减弱,到大树阶段为随机分布.研究表明,物种分布格局主要与物种本身的生物生态学特性和生境有关.

Spatial Distribution Patterns and Dynamics of Major Population in Populus euphratica Forest in Upper Reaches of Tarim River

The spatial distribution patterns and dynamics of major populations in Populus euphratica forest were studied by taking natural P.euphratica forest of Awati county in upper reaches of Tarim River,sampling by contiguous grid quadrate method and making use of such indexes as variance/mean ration,negative binomial parameter,diffusing index,cassie index,clumping index and patchiness index.The results showed that all the major population in the P.euphratica community except Asparagus persicus population,which presented a random distribution,had an aggregated distribution.The tested results of Iwaoym regression and Taylor principle furthered to testify that spatial distribution of dominant P.euphratica and P.pruinosa was clumping distribution.The distribution patterns of P.pruinosa population at sapling tree,median tree and large tree stages are cluster;the patterns of P.euphratica population at sapling and median tree are cluster,and at large tree stage are random.This distribution patterns of the species are mainly related to their ecological and biological characteristics and habitat.