掺合土壤和设缓冲区对梯田出口除草剂含量的影响

• 作 者: S．K．Mickelson J．L．Baker S．W．Melvin R．S．Fawett 辛晓桂
• 机 构: 美国Iowa农业生态工程大学,中科院水利部水土保持研究所
• 出 处: 水土保持科技情报
• 发表日期: 1999年04期
• 关键词: 最佳管理方法 除草剂 掺合 径流 缓冲区 梯田 排水口 进水口 出水口 排水系统

由于对除草剂如莠去津和草净津使用范围有了限制，迫使生产者在一个有排水系统梯田的进水口处设立一条缓冲区。通常在经济能力、技术条件许可的情况下，设立缓冲区被认为是可选择的最佳管理方法。然而试验表明：在进水口设立缓冲区同无缓冲区的处理相比，并没有减少出水口处的除草剂浓度；同时发现，用无缓冲区有掺合的方法和在出水口设立缓冲区相比，对于减少除草剂流失同样有效。

Due to restrictions on the use of herbicides such as atrazine and limpetium, producers are obliged to set up a buffer at the intake of a terraced drainage system. The establishment of a buffer zone is generally considered to be the best option for management, usually with financial capacity and technical conditions in mind. However, tests showed that the establishment of a buffer zone at the water inlet did not reduce the concentration of herbicide at the outlet compared with the non-buffer zone treatment. At the same time, it was found that a buffer zone-free blending method and a buffer zone phase- Than the same, for reducing the loss of herbicides as effective.