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| Effects of contour grass hedges on migration of tribenuron-methyl residue in sloping cropland soil |
| Received:January 11, 2016 |
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| KeyWord:contour grass hedge;herbicide residue;migration characteristics;sloping cropland |
| Author Name | Affiliation | E-mail | | WANG Qing-hai | Beijing Research and Development Center for Grass and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | PANG Zhuo | Beijing Research and Development Center for Grass and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | ZHENG Rui-lun | Beijing Research and Development Center for Grass and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | LI Cui | Beijing Research and Development Center for Grass and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | CHEN Jie | Beijing Research and Development Center for Grass and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | MA Xue-ju | Beijing Research and Development Center for Grass and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | QUE Xiao-e | Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China | quexiaoe@sina.com |
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| Abstract: |
| Here we evaluated the effects of two grass hedges, Melilotus officinalis and Pennisetum alopecuroides, on migration and distribution of tribenuron-methyl residue in sloping cropland soil. Experiments were carried out in winter wheat(Triticum aestivum) field on 15% and 20% gradient slopes in the Changping District of Beijing, China, under simulated rainfall(rainfall intensity at 15 and 20 mm·h-1). Soil samples were collected from the middle and bottom positions of the slope at three depths(0~5, 5~10 and 10~15 cm). Results indicated that the movement of tribenuron-methyl in soil was dominated by vertical migration when rainfall events occurred after a long dry period. The horizontal migration was not obvious, with no residues detected in the surface runoff. Grass hedges accelerated the vertical migration of tribenuron-methyl residues. The residual levels of tribenuron-methyl did not differ among 3 soil depths inside the hedges, whereas tribenuron-methyl residues were markedly higher in topsoil than in subsurface soil, and decreased significantly with increasing soil depth in slope areas without hedges. Grass hedge, rainfall intensity and slope gradient significantly influenced the transport of tribenuron-methyl residues in soil. The optimal scaling regression showed that grass hedge was the dominant factor, followed by rainfall intensity and slope gradient, in controlling pesticide migration on sloping croplands. |
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