Study on the Relationship Between Agricultural Soil Fauna and Soil Physicochemical Properties

During the summer harvest of 2001, field investigations of 90 samples of soil and 6 414 individuals of soil fauna collected by handsorting and Cobb method from 6 treatments (CK, abandon, NPK, MNPK, 1.5MNPK and SNPK)of 5 types of soil (Loess soil, Fluvo-aquic soil, Paddy soil , Purple paddy soil and Red soil) at the State's Experimental Research Network for Soil Fertility and Fertilizers, which belonged to 6 Phyla, 12 Classes, 22 Orders, respectively, were carried out. The relationship between agricultural soil fauna and soil physicochemical properties was analysed by canonical correlation analysis based on 6 indexes of soil physicochemical properties and 8 types of soil fauna in the paper, which respectively include soil organic matter, pH, porosity, field capacity, total nitrogen, volume weight and Nemata, Oligochaeta, Gastropoda, Araneae, Acariformes, Isopoda, Diplopoda, Collembola, Coleoptera, Hymenoptera, aimed to find major soil factor variables affecting soil fauna in different treatments of different types of soil. The results indicated that Nemata, Acariformes and Coleoptera were affected by the contents of organic matters, total nitrogen and field capacity in soil, especially Nemata and Acariformes by the contents of organic matters and total nitrogen in soil, while other factors had not much relation with that pattern of distribution. It was found that 10.79% and 13.00% of the variance of soil fauna in 6 types of soil was respectively explained by the first and the second canonical variable of soil factor variable, the rest was not interpreted yet.