Abstract: According to investigation and study on the soil animals of 9 habitats of the purple shale soil in the Hengyang basin,a total of 3585 soil animals belonging to 4 phylums,8 classes and 39 orders were obtained.Among them,the dominant groups werer nematoda and acarina,which amounted to 50.24% of total animals.Common groups were 12 sorts,amounting to 44.01% of total.The study on the horizontal distribution of soil animals showed that 9 kinds of habitat affinity level are higher.Among them,the affinity level is more significant between reed bamboo forest and peach forest,brmad leaved forest and eucalyptus forest,baraboo reed forest and eucalyptus forest .The study on the vertical distribution of soil animals showed that only peach forest and orange forest had clear layers among the 9 kinds of habitats,bamboo.Obvious surface aggregation appeared in all habitats.Divlayers ersity and evenness of soil animal community in reed, forest,orange forest,eucalyptus forest,vegetable plot,broad leaved forest and peach forest were consistent with each other.

Key words: Urease inhibitor, Nitrification inhibitor, NH₄⁺-N, NO₃^--N, NO₃^-leaching