Effect of Organic Materials on Soil Microbial Biomass and Soil Enzyme in the Soils Contaminated by Organophosphorus Pesticides

Pesticide pollution seriously endangers soil ecology and food security. In order to understand the effect of organic materials on the remediation of soils contaminated with pesticides, in this paper, in condition of indoor constant temperature and humidity, soil biomass and soil enzyme were studied in organophosphorus pesticides contaminated soil by application glucose, compost and straw.The result showed that the effects of parathion pesticide on soil biomass carbon and respiration intensity were suppression in earlier period(0~3 d), promotion in medium(3~40 d) and stability in the later stage(after 40 d). After application organic materials, soil biomass carbon and respiration intensity significantly increased. In which, soil biomass carbon of glucose, compost and straw treatments were the highest in 9 d、30 d、40 d respectively and soil respiration intensity were the highest in 9 d、30 d、50 d respectively. The effect of parathion pesticide on soil catalase and urease activity were suppression at first, then activation, but later restore. After adding organic materials, compost and straw significantly improved the activity of soil catalase and urease. The activity of soil catalase and urease were the highest in 0~20 d and 20 d respectively in compost treatment. And they were the highest both in 40~50 d in straw treatment. At the end of culture(70 d), the activity of soil catalase and urease in compost treatment and straw treatments were higher than that in glucose and CK treatments. Glucose had influence on soil catalase and urease at the earlier stage(0~40 d), but had no difference from CK at later stage(40~70 d). The results showed that organic materials not only increased soil microbial biomass and respiration intensity, but also improved soil enzyme activity. It played a positive role in remediation of pesticide contaminated soil.