中文摘要：

在甘肃河西走廊黑河中游荒漠绿洲过渡区，天然沙质草地被相继转变为农田和防风固沙人工林，但目前尚缺乏不同土地利用／管理方式下地面节肢动物群落对土壤盐渍化响应的系统研究。以天然沙质草地转变的人工梭梭灌木林、人工杨树林、人工樟子松林和农田为研究对象，以天然草地为对照，基于5种研究样地表层土壤盐分及其组成和地面节肢动物群落的观测数据，采用RDA（Redundancy analysis）排序分析等方法，研究了不同土地利用／管理方式下地面节肢动物个体数量和类群丰富度对土壤盐分环境变化的响应机制。主要结果为：（1）土地利用变化与管理措施相互作用驱动了地面节肢动物群落的演变过程，天然草地植被转变为人工林和农田20多年后，显著降低了地面节肢动物群落的数量而对类群丰富度无显著影响。（2）地面节肢动物群落的变化受土壤pH、Na＋、Mg2＋、Cl-离子的共同影响，其中土壤pH、Na＋和Mg2＋离子对动物群落变化的贡献率最大，是关键生态因子。（3）动物个体数量随土壤pH的增加而增加，随Mg2＋、Cl-离子浓度的增加而下降。研究表明，土地利用变化引起的土壤盐分环境改变是驱动地面节肢动物群落演变的重要因素之一。

英文摘要：

For decades,a large area of natural desert grasslands in the middle reaches of the Heihe River in Hexi Corridor of Northwest China has been converted tract by tract into farmland and plantation. However,few researchers have addressed responses of ground arthropod communities to soil salinization in lands different in landuse and management. In this study,five major types of land use 21-year-old planted shrubland without irrigation and fertilization,28-year-old irrigated Poplar plantation and 33- year-old irrigated Pinus plantation,27-year-old farmland with irrigation and fertilization, and natural desert grassland were selected for comparison with the last one as control. All the sampling plots, except the last used to be natural desert grassland. Soil salinity and its composition in the surface layer and ground arthropod communities in the plots were observed. Based on the observations, redundancy analysis （RDA） and multiple regression analysis were performed to determine relationships between the distribution of the arthropod community and soil salinization variables. The one-way analysis of variance demonstrated that the conversion of natural grassland to planted shrubland,Polar plantation, Pinus plantation and farmland significantly reduced abundance of the ground arthropod community, but little affected species richness of the arthropod community. Results of RDA show that soil salinization properties had significant and differential effects on abundance and species richness of the arthropod community. The key factors affecting composition of the ground arthropod community were soil pH, Na＋ , Mg2＋ , Cl- and SO42- concentrations in the topsoil layer. Abundance of the ground arthropods increased with increasing soil pH and decreased with increasing Mg2＋ and Cl- concentrations. The findings suggest that change in soil salinity environment caused by changes in land-use and management is one of the key variables driving evolution of the ground arthropod community.