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杜加依林建群种胡杨(Populus euphratica)的水分再分配现象已被广泛认知,但该现象对其伴生种多样性和生态位宽度的影响仍不清楚。基于120个样方的调查数据,通过分析比较2010年6、8、10月胡杨林冠下(林冠群落)与非胡杨林下(对照群落)在群落数量特征、物种多样性和生态位宽度上的差别,以探明水分再分配和物种多样性间的关系。结果表明:(1)林冠灌木和草本群落的郁闭度、株高和多度在6、8、10月均分别显著高于对照灌木和草本群落(P<0.05);(2)在6、8、10月,林冠灌木的Margalef丰富度指数和Brillouin物种多样性指数均显著高于对照群落(P<0.05),Pielou均匀度指数在两群落间未有显著性差别(P>0.05);相反,林冠草本群落的Margalef丰富度指数仅在6月和10月显著高于对照群落(P<0.05),其他时期,林冠草本群落的物种多样性指数均小于对照群落;(3)林冠灌木和草本群落的物种生态位宽度多高于对照灌木和草本群落。胡杨作为杜加依林的建群种,其拥有水分再分配现象能够改善森林的水分条件,对胡杨林冠下伴生种群落的数量特征、生态位宽度和物种多样性产生积极影响。
The phenomenon of redistribution of water in Populus euphratica has been widely recognized, but the effect of this phenomenon on the diversity and niche breadth of its associated species remains unclear. Based on the survey data of 120 quadrats, the differences in quantitative characteristics, species diversity and niche breadth of Populus euphratica under canopy (canopy canopy and non-populus canadensis) in June, August and October in 2010 were compared To determine the relationship between water redistribution and species diversity. The results showed that: (1) Canopy density, plant height and abundance of canopy shrub and herb community were significantly higher than those of control shrub and herb community in June, August and October respectively (P <0.05); (2) In August and October, Margalef abundance index and Brillouin species diversity index of canopy shrubs were significantly higher than those of control (P <0.05), but Pielou evenness index had no significant difference between the two communities (P> 0.05) , Margalef abundance index of canopy community was significantly higher than that of control community only in June and October (P <0.05), and in other periods, the species diversity index of canopy community was less than that of control community; (3) Canopy shrub and herb The species niche breadth of the community is much higher than that of the control shrub and herb community. Populus euphratica, as a built-up species of Douggalin, possesses the phenomenon of redistribution of water, which can improve the water conditions of forests and has a positive impact on the quantitative characteristics, niche breadth and species diversity of the associated community under Populus canopy.