Abstract: To investigate the impacts of grazing on ground-dwelling arthropod communities in typical grasslands， 147 pitfall traps were deployed across different grazing management sites in Abaga Banner， Xilin Gol League， Inner Mongolia. A total of 12 059 arthropod individuals were captured， which belonged to 2 classes， 12 orders， and 83 families. The dominant groups were Formicidae， Carabidae， and Acridoidea. The number of arthropod species in the pasture of no grazing （0 sheep unit·hm^-2·a^-1）， light grazing （0.34 sheep unit·hm^-2·a^-1）， moderate grazing （0.69 sheep unit·hm^-2·a^-1） and heavy grazing （1.53 sheep unit·hm^-2·a^-1） were 50， 66， 60 and 61 families， respectively. The results indicated that grazing helped increase the number of arthropod species， abundance， and richness， but decrease evenness. Predatory arthropods exhibited higher diversity in lightly grazed grasslands and greater activity density in heavily grazed grasslands， while herbivorous arthropods had the lowest diversity and activity density in no grazing grasslands. Correlation analysis revealed that arthropods in no grazing grasslands were more strongly associated with soil physicochemical properties. In conclusion， arthropods respond differently to varying grazing intensities and can serve as bioindicators for grassland grazing management.

Key words: Grazing intensity, Ground-dwelling arthropod diversity, Community characteristic, Functional group, Soil environmental factors

摘要： 为探究放牧对典型草原地表节肢动物群落的影响，在内蒙古锡林郭勒盟阿巴嘎旗不同放牧管理草场布设147个陷阱，捕获节肢动物12 059头，属2纲12目83科，优势类群为蚁科（Formicidae）、步甲科（Carabidae）和蝗总科（Acridoidea）。禁牧（0 羊单位·hm^-2·a^-1）、轻牧（0.34 羊单位·hm^-2·a^-1）、中牧（0.69 羊单位·hm^-2·a^-1）和重牧（1.53 羊单位·hm^-2·a^-1）草场的节肢动物物种数分别为50科、66科、60科和61科。结果表明，放牧有助于提高节肢动物物种数、多度和丰富度，但会使其均匀度下降。捕食性节肢动物在轻牧草场的多样性较高，在重牧草场的活动密度较大，植食性节肢动物在禁牧草场的多样性和活动密度均最低。相关性分析表明，禁牧草场节肢动物与土壤理化性质相关性更强。总之，节肢动物对不同放牧强度的响应存在差异，可作为草原生态系统放牧管理的指示生物。

关键词: 放牧强度, 地表节肢动物多样性, 群落特征, 功能群, 土壤环境因子