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首页> 外文期刊>International Journal of Plant & Soil Science >Water, Sediment and Nutrient Retention in Native Vegetative Filter Strips of Southern Brazil
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Water, Sediment and Nutrient Retention in Native Vegetative Filter Strips of Southern Brazil

机译：巴西南部天然植物滤料条中的水，沉积物和养分保留

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摘要

Vegetative filter strips (VFS) are areas adjacent to watercourses with the purpose of reducing sediment and nutrients contained within runoff water from cropland. The aim of this study was to evaluate the retention of water, sediment and nutrients in VFSs with 5, 10, 20 and 30 m widths exposed to simulated runoff water. The VFS chosen for this study were populated by native herbaceous vegetation with a predominance of grasses from South of Brazil. To simulate runoff water, a flow of 30 L min-1 was applied to all plots. Simulated runoff water contained 3.22 g L-1 of sediment and the nutrients concentration was 62.2; 40.9 and 170.3 mg L-1 de P, NH4-N and NO3-N, respectively. As expected, we found the VFS (30 m) could retain a greater quantity of nutrients (>80%), water (66%) and sediment (84%). However, we found the VFS (of width 10 m) was the most efficient when considering area against nutrient (>70%), water (42%) and sediment (73%) retention. With a ever expanding human population and intensive land use in Brazil, efficient use of VFSs could reduce water pollution from agriculture field.
机译：营养滤带（VFS）是水道附近的区域，目的是减少农田径流水中的沉积物和养分。这项研究的目的是评估暴露于模拟径流水中的宽度为5、10、20和30 m的VFS中水分，沉积物和养分的保留情况。这项研究选择的VFS由当地草本植物组成，其中大部分来自巴西南部。为了模拟径流水，将30 L min -1 的流量应用于所有样区。模拟的径流水中含3.22 g L -1 沉积物，养分浓度为62.2。 P，NH4-N和NO3-N分别为40.9和170.3 mg L -1 。不出所料，我们发现VFS（30 m）可以保留更多的养分（> 80％），水（66％）和沉积物（84％）。但是，我们发现当考虑营养物（> 70％），水（42％）和沉积物（73％）滞留面积时，VFS（宽度为10m）是最有效的。随着巴西人口的不断增长和土地集约利用，有效使用VFS可以减少农业领域的水污染。

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