作物植株残体还田土壤对除草剂的截留作用

加入成熟作物植株残体还田的土壤（简称秸秆还田土壤）与自然土壤的土柱淋洗对比实验，研究了玉米秸秆还田土壤对除草剂乙草胺和阿特拉津的截留作用以及水稻秸秆还田土壤对丁草胺的截留作用。结果表明，作物秸秆还田土壤对所研究的三种除草剂有明显的截留作用，在土桩的最上部10cm内，秸秆还田土壤对乙草胺、丁草胺和阿特拉津的截留量分别是自然土壤对其截留量的1.33、1.77和1.88倍。

Interception of herbicides by soil within crop plant residues

The interceptions of acetochglor,butachlor and atrazine by soil within crop plant residues (corn plant residues for acetochlor and atrazine, rice plant residues for butachlor) were studied through the comparison between leaching experiments of herbicides in soil columns applied with crop plant residues and in natural soil columns. The results showed that the soil applied with crop plant residues had a remarkable retardancy to 3 herbicides studied in soil columns. The retardancies of upper 10cm of soil column applied with crop plant residues to acetochlor, butachlor and atrazine were 1 33, 1.77 and 1.88 times of natural soil column in the same depth respectively. The herbicide accumulation and interception layers formed in soil depend on the soil character , herbicide property and amount of crop plant residues.