论文部分内容阅读
农田控制排水对减少土壤养分淋失、保护农田水环境具有重要作用。为探讨影响地下排水磷淋失量的要素,基于田间实验小区观测资料,统计分析了玉米作物生长期间农田水位管理系统运行对地下排水量和磷淋失量的影响,结果表明,与暗管自由排水系统相比,农田水位管理系统下的累积排水总量约减少1/3,但次地下排水磷淋失浓度和地下排水总磷累积淋失量均明显增高。农田水位管理系统下存在的土壤持续性饱和厌氧状态造成地下排水中氧化还原电位Eh的明显降低和pH值及可溶解性Mn和Fe浓度的显著增大,这或许是导致该系统地下排水磷淋失量明显高于暗管自由排水系统的主要影响因素。
Farmland drainage control to reduce soil nutrient leaching, farmland water environment has an important role. In order to explore the factors that affect phosphorus leaching in underground drainage, the effects of farmland water level management system on underground drainage and phosphorus leaching loss were statistically analyzed based on field experimental data. The results showed that, Compared with the system, the cumulative total drainage of farmland water level management system decreased by about 1/3, but the phosphorus leaching concentration of sub-underground drainage and the cumulative leaching of total phosphorus in underground drainage increased obviously. Persistent saturated anaerobic conditions in the farmland water level management system resulted in a significant decrease in the redox potential Eh and a significant increase in pH and soluble Mn and Fe concentrations in the underground drainage, which may be responsible for the underground drainage of phosphorus Leaching loss was significantly higher than the main factors affecting the free drainage system.