新疆阜康绿洲荒漠过渡带植物群落物种多样性与土壤环境因子的耦合关系

对新疆阜康绿洲荒漠过渡带植物群落4个物种多样性指数和3层土壤19个指标进行回归分析，结果表明，土壤酸碱度，全盐量，Cl^-,K^ Na^ ,Mg^2 ，土壤有机质，全N和速效P与物种多样性有显著相关关系（P＜0．05）。酸碱度和有机质与多样性的最好拟合为二项式，即高的物种多样性出现在梯度中间位置。其余6个指标与物种多样性为显著线形负相关关系。表明全盐量，Cl^-,K^ Na^ ,Mg^2 含量越多，物种多样性越小，全N和速效P与均匀度均呈显著负相关，表明全N和速效P含量上升，均匀度显著下降，植物个体数与土壤水盐的回归分析表明，植物多度受土壤水分和盐分影响显著（P＜0．01）。

Coupling relationship between plant communities' species diversity and soil factors in ecotone between desert and oasis in Fukang,Xinjiang

Regression analysis was used to study the relationship between four diversity indices and 19 soil factors at three different soil layers in ecotone between desert and oasis in Fukang,Xinjiang. The results indicated that soil pH,total salt content,soil organic matter,Cl+-,K+++Na++,Mg+{2+},total nitrogen,and available phosphorus were correlative to species diversity significantly (P<0^05). The relationships between pH and diversity and between organic matter and diversity were best fitted in form of binomial model,and it meant that the highest species diversity occurred in middle of the gradient. The relationships between diversity and other 6 indices were in form of negative linear regression,showing that the contents of total salt,Cl+-,K+++Na++,Mg+{2+} were greater,and the species diversity indices were smaller. And the regression of total nitrogen and available phosphorus with evenness were similar to the former,that is,with the contents of soil total nitrogen and available phosphorus increasing,evenness indices decline correspondingly. The results of regression analysis between amount of plants and soil moisture and salt showed that plant abundance was influenced by soil water and salt significantly (P<0^01).