塔里木河下游植物群落组成及主要种间关系研究

对塔里木河下游38个植物样地野外采集的数据进行分析,结果表明:代表性的植物有胡杨、多枝柽柳、刚毛柽柳、黑果枸杞、花花柴、骆驼刺等14种,物种较为贫乏。通过重要值分析,确定各物种在群落中的地位和作用。通过2×2联列表,应用方差比率(VR)、X2统计和r检验等方法对上述14个优势种群间的总体相关性、各种对间联结显著性进行了测定,结果表明:塔河下游各物种的总体关联性为不显著的正联结,种间绝大多数不存在显著、极显著的正联结或负联结,无相关的较多,总体上趋于独立分布。显示出该群落的年轻性和不稳定性,与先锋林地的特点相吻合。另据分析结果可将塔河下游物种分为3个生态种组。

The Composition of Plant Community and the Main Species Relation in the Lower Reaches of Tarim River

The thirty-eight vegetation samping date were calculated and analyzed in the lower reaches of Tarim River.The results showed that there were 14 main species including Populus euphratica,Tamarix ramosissima,Tamarix hispida,Lycium ruthenicum,kareliniacaspica,Alhagi pseudoalhagi and so on.The species is less.By analyzing the important values,these species' s position and role were measured in plant community.By 2×2 contingency table and VR and X2 and r-test,the 14 species' s associations and correlations were measured.The results showed that total associations were unremarkable positive in the lower reaches of Tarim River.Among the species it was unremarkable positive and negative association.The results showed that the plant community was juvenile and immature woodland.It showed the character of the pioneer woodland.The results also showed that the species could be divided into three biological groups in the lower reaches of Tarim River.