中文摘要：

以荒漠草原区6、15、24、36年生柠条灌丛为研究对象，调查了不同林龄灌丛内外土壤性质和地面节肢动物群落特征，分析了干旱区灌丛斑块生境中地面节肢动物群落随灌木林发育的变化特征．结果表明：1）6年生林地只对土壤物理性质（土壤质地、含水量、pH和电导率）产生显著影响，从15年开始林地土壤有机质和养分（N、P）显著增加．2）在研究样地共捕获27个节肢动物类群，步甲科、拟步甲科和蚁科是优势类群．从6到15年生林地，地面节肢动物优势类群数减少，常见类群数增加．从15年生经24年生到36年生林地，灌丛内外类群组成差异先缩小后变大．36年生林地某些特殊的动物类群开始大量出现，如蜣螂在36年生林地灌丛中成为优势类群．3）6和24年生林地灌丛内外地面节肢动物群落结构差别较小，15和36年生林地灌丛内外地面节肢动物群落结构差异显著．4）林龄对灌丛内地面节肢动物的分布影响较大，而对灌丛外地面节肢动物的分布影响较小．灌丛发育过程通过对灌丛下微生境的改变如土壤质地、电导率、pH等来显著影响地面节肢动物的分布，并对灌丛外样地产生一定的辐射作用．干旱区灌丛发育过程对地面节肢动物聚集效应产生显著影响，在不同林龄阶段这种聚集效应表现不一，直接影响沙化草地生态系统的恢复过程．

英文摘要：

Taking the 6-, 15-, 24- and 36-year-old Caragana intermedia shrubs in desert steppe as a subject, an investigation on soil properties and ground arthropod community was carried out under the shrub and in the open to probe into the assemblage effect of ground arthropod community in des- ert steppe shrubs with different ages. The results were as follows： 1 ） In the 6-year-old shrubland, significant differences were only found in soil physical properties （soil texture, soil moisture and electrical conductivity） between the microhabitats under shrub and in the open. Beginning from the 15-year-old shrubland, however, soil organic matter and nutrition （N, P） increased significantly. 2） A total of 27 groups were captured in the studied sites which dominated by Carabidae, Tenebri- onidae and Formicidae. From 6- to 15-year-old shrubland, the number of dominant groups de- creased while that of common groups increased for the ground arthropod community under the shrub. From 15- to 24- and 36-year-old shrubland, the difference between the microhabitats under the shrub and in the open decreased firstly, and then increased. Some special groups appeared under the shrub in the 36-year-old shrubland, and dung beetles became dominant. 3） In the 6- and 24-year-old shrublands, there were no significant differences in group richness, abundance, and di- versity index between the microhabitats under the shrub and in the open. As for the 15- and 36- year-old shrublands, however, significant differences were observed. 4） The shrub age had a stron- ger effect on the distribution of ground arthropods living under the shrubs compared to that in the open. The changes in soil texture, pH and electrical conductivity could significantly influence onthe distribution of ground arthropods under the shrub, also in the open to some degree. It was sug- gested that the development of shrubland had strong impact on assemblage effect of ground arthro- pods, which was closely correlated with the stand age and would affect the recovery o