关键词: 土壤动物, 群落特征, 黄土残塬沟壑区, 典型相关分析, 土地利用方式

Abstract: In order to explore the relationship between soil environmental factors and soil animal communities under different land use patterns in the gully region of Loess Plateau, the characteristics of soil animal communities under five land use patterns of farmland, vegetable field, orchard, woodland and wasteland were investigated from July to September in 2018. A total of 15 141 soil animal individuals belonging to 5 phyla, 11 classes and 22 orders were obtained by hand picking method and dry-wet funnel method. Canonical correlation analysis was used to study the main soil factors affecting soil animals under different land use patterns. The results showed that there was a significant correlation between the typical variables of soil factors Ⅰ and Ⅱ and the typical variables of soil animal groups Ⅰ and Ⅱ (P<0.001). The loads of available phosphorus, available nitrogen and available potassium in the first typical variable U1 were higher, and the loads of Emata, Styommatophora and Hymenoptera in V1 were higher. In the second typical variable U2, the loads of total nitrogen content, available phosphorus content and bulk density were higher; while in V2, the loads of Styommatophora, Collembola and Coleoptera (adult) were higher. The canonical redundancy index analysis was used to test the results of canonical correlation analysis. It was found that the first and second variables of soil physical and chemical properties could explain the changes of 12.90% and 33.64% of the main groups of soil animals, and the first and second typical variables of soil animal groups explained 26.72% and 2584% of soil physical and chemical properties, respectively. The research provided scientific basis for rational development and utilization of land resources, biodiversity conservation and sustainable agricultural development in gully area of Loess Plateau.

Key words: soil fauna, community characteristics, gully area of Loess Plateau, canonical correlation analysis, land use pattern