Abstract:
To explore effects of irrigation method on community structure of soil macro-animals, a survey was carried out in May-November 2015 of community structures of the soil macro-fauna and soil physico-chemical properties of the sugarcane fields under water-saving irrigation experiment in Jiangzhou District, Chongzuo of Guangxi. The water-saving irrigation experiment was designed to have 5 irrigation methods, i. e. imbedded drip irrigation, surface drip irrigation, tube irrigation, sprinkler irrigation and micro-sprinkling irrigation, and a blank (no irrigation) added as control. In the plots of the six treatments, a total of 1 180 individuals of soil macro-fauna were collected, belonging to two phyla, 10 classes and 18 orders. Hymenoptera (Formicidae) was the dominant group, accounting for 71.44% of the total, and Araneae, Isoptera (Termitidae), Dermaptera, Orthoptera, Coleoptera, Blattaria, Hemiptera, and Isopoda were the common ones. The treatments did not vary much in number of groups, but all the treatments with irrigation, especially the treatments of imbededed drop irrigation and sprinkling irrigation, were obviously higher than control in density of soil macro-fauna, Shannon-Wiener diversity index (
H), Pielou evenness index (
E), and Margalef abundance index (
D), but lower in Simpson dominance index (
C). Moreover the treatments also varied significantly in soil physicochemical property. The treatments with irrigation were all, especially the treatments of imbededed drop irrigation and sprinkling irrigation, higher than control in soil water content, organic matter, available nitrogen, available phosphorus and available potassium. Obviously, water-saving irrigations enhance or improve soil water storage capacity, soil nutrient supply and micro-environment of the sugarcane fields, and alter community structure of the soil macro-fauna, mainly in density and diversity. Imbedded drip irrigation and sprinkler irrigation works the most prominently.