天山北部拟南芥生存群落物种多样性的空间格局

Spatial patterns of species diversity of the communities within which Arabidopsis thaliana survived in Northern Tianshan Mountains

在对新疆天山北部浅山地带拟南芥(Arabidopsis thaliana)生存分布调查的基础上,研究了13个拟南芥样地(生存群落)的综合物种多样性格局特征及环境因子对其空间格局的影响。结果表明,各样地物种多样性指数差异明显。天山西支婆罗科努山的伊犁地区多样性最大,塔尔巴哈台山额敏地区其次,天山中部8个样地多样性较低且变幅较大,阿尔泰山阿勒泰地区多样性指数处于中等水平,总体上,13个拟南芥样地物种多样性空间格局异质性明显;各样地拟南芥及其邻近种种类及数量不一,以天山中部最多;物种多样性空间格局与降水量变化关系拟合较好,随降水量增加而增大;物种多样性指数的DCCA排序表明,除降水量外,坡向、有效钾及电导率等微环境因子也是影响物种多样性空间格局的重要因素。

Based on the survey of Arabidopsis thaliana distribution in Northern Tianshan Mountains in Xinjiang, this paper studied the characteristics of species diversity in 13 A. thaliana plots （ the communities within which A. thaliana survived）, and the effects of environmental factors on the spatial patterns of the diversity. The results showed that the species diversity indices differed largely with the plots, being the highest in Yili region at Borohoro Mountain, followed by in Emin region at Taerbahatai Mountain. The diversity indices of 8 A. thaliana plots in mid-Tianshan Mountains were low and changed largely, and those in Aletai region at Ahay Mountain were at medium level. As a whole, the species diversity patterns appeared evident spatial heterogeneity. The kind and amount of A. thaliana and its adjacent species in each plot were different, with the highest in mid-Tianshan Mountains. The species diversity patterns fitted well with precipitation, and the diversity indices generally increased with increasing precipitation. The DCCA ordination of diversity indices indicated that in addition to precipitation, the micro-environmental factors such as slope aspect, soil available potassium, and soil electrical conductivity were also the important factors affecting the species diversity patterns.