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用未经放牧的植物缓冲带使水体免受牧场径流中沉积物和营养物的污染 ,常被认为是最好的管理方法。研究的目的是测出径流中NO3 N ,总P及悬浮物的质量浓度 ,并评估山麓牧场经灌溉后产生的径流经 10m缓冲带后水质的变化。喷灌水量和大水漫灌水量中分别有 15 %和 6 9%变成了径流。灌溉期间径流中各成分质量浓度的变化非常迅速且明显。 10m缓冲带并没有明显降低喷灌和大水漫灌下径流中NO3 N的质量浓度和输移率。缓冲带既不能减少灌溉方案下总P的质量浓度 ,又不能减少喷灌方式下总P和悬移质输移率。但缓冲带在两种灌溉方式下确能降低悬浮物的质量浓度 ;在大水漫灌方式下能减少总悬浮物的输移量和总P量。这些结果反映了缓冲区建立后第 1年的缓冲效果。为了从这些系统中减少对水质的潜在污染 ,通过提高灌溉水分的利用效率来减少径流量 ,是最易让人接受并且是最切实可行的方法。
It is often considered as the best management method to use non-grazing plant buffer to keep the water body from the sediment and nutrients in runoff runoff. The aim of the study was to determine the mass concentrations of NO3 N, total P and suspended solids in runoff and to assess the changes in water quality after 10 m of runoff from runoff from the ranch pasture. 15% and 69% of the sprinkler irrigation volume and the flood irrigation amount respectively became runoff. The variation of mass concentration of each component in runoff during irrigation is very rapid and obvious. The 10m buffer zone did not significantly reduce the mass concentration and transport rate of NO3N in runoff under sprinkler irrigation and flood irrigation. The buffer zone can not reduce the mass concentration of total P in the irrigation scheme, but also can not reduce the total P and the suspended matter transport rate under the sprinkling irrigation mode. However, the buffer zone can reduce the mass concentration of suspended matter under the two kinds of irrigation methods. It can reduce the total amount of suspended matter and total P transport under the condition of flood irrigation. These results reflect the buffer effect of the first year after the buffer was established. In order to reduce potential pollution to water quality from these systems, it is the most acceptable and practicable method to reduce runoff by increasing the efficiency of irrigation water use.