Effects of emamectin benzoate on soil animal community in a black soil farmland
Emamectin benzoate is one of the most efficiently semi-synthetic antibiotic pesticides.However,little is known about the responses of composition,structure and biodiversity of soil animal community to the application of emamectin benzoate.In order to reveal the effects of emamectin benzoate on soil animal community,a field experiment was carried out in a typical black soil farmland area of Hulan district,Harbin city,Northeast China.Based on fixing-plot investigation in 2012,the plots were treated by different concentrations of emamectin benzoate,and then the soil samples were collected from different stratification (i.e.0-5 cm,5-10 cm,10-15 cm and 15-20 cm) in May,July and September.In total,5772 individuals belonging to 4 classes,11 orders were captured,and all of them were divided into 31 groups.The results showed that under emamectin benzoate treatment (1) individual densities and group numbers of soil animal decreased significantly,and the decreasing trends of individual densities and group numbers were more obviously with increasing concentrations of emamectin benzoate;(2) the vertical distribution structures of soil animal communities were changed obviously,and most individuals and groups of soil animals preferred to gather in the 5-15 cm soil layer rather than in the 0-5 cm soil layer;(3) the diversities of soil animal communities were changed,but the contributions of different groups to community diversity were different,in which contributions of soil mites and springtails were relatively large than those of other groups;(4) the soil chemical properties of topsoil were changed significantly.However,responses of soil animal groups to soil environmental change were groups-specific,in which soil mites and springtails exhibited a stronger adaptive ability than those of the others.In a word,emamectin benzoate treatment can significantly change the community structure,vertical pattern and diversity of soil animal community in a typical black soil farmland area.It is emphasized that the concentration of emamectin benzoate might be an important indicator when we assess the influence of emamectin benzoate on soil animal community.It is suggested that we should prudently assess the ecological consequences when using the emamectin benzoate in farmland ecosystems.
NETL
NSTL
万方数据
维普
