TITLE

等高草篱对坡耕地土壤苯磺隆残留迁移的影响

AUTHOR(S)
王庆海; 庞卓; 郑瑞伦; 李翠; 陈洁; 马雪菊; 却晓娥
PUB. DATE
June 2016
SOURCE
Journal of Agro-Environment Science;2016, Vol. 35 Issue 6, p1081
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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.
ACCESSION #
118016648

 

Related Articles

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics