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Effect of land use change from paddy to vegetable field on the residues of organochlorine pesticides in soils |
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| Authors: | Hao Hongtao Sun Bo Zhao Zhenhua |
| Institution: | a Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, P. O. Box 821, Nanjing 210008, China b College of Environmental Science and Engineering, Hehai University, Nanjing 210098, China c Graduate School of the Chinese Academy of Sciences, Beijing 100039, China |
| Abstract: | The effect of land use change from paddy to vegetable field on the residues of organochlorine pesticides (OCPs) was investigated. Soil residues of OCPs were analyzed in vegetable fields which had been converted from paddy fields for 0, 5, 10, 15, 20, 30, 50 year in Yixing, China in 2003. The mean concentrations of OCPs followed a sequence of: ∑DDTs (13.7 μg kg−1) > ∑HCHs (8.6 μg kg−1) > > HCB (2.09 μg kg−1) > α-endosulfan (1.30 μg kg−1) > endrin (1.08 μg kg−1) > PCNB (0.76 μg kg−1) > dieldrin (0.58 μg kg−1). The mean residues of OCPs especially DDTs increased significantly with vegetable planting time after land use change in the first 15 years, then decreased from 20 to 30 years and increased a little afterward. The time under anaerobic and aerobic conditions was suggested to control mainly the change of the residues of OCPs. |
| Keywords: | Organochlorine pesticides DDT HCH Land use change Vegetable field Paddy field |
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