Optimization and influence of vegetative filter strip's pattern on reduction of runoff and its sediment in the Inner Mongolia farming-pastoral ecotone
SONG Fan-fan1, LI Xian-yue1, TIAN De-long2
1. Water Conservancy and Civil Engineering College of Inner Mongolia Agricultural University, Hohhot 010018, China; 2. Institute of Pastoral Water Conservancy, Ministry of Water Resources, Hohhot 010020, China
Abstract：In order to improve the performance of vegetative(grass)filter strips(VFS) decreasing runoff and its sediment in the farming-pastoral ecotone,the experiment was carried out at the Jubaozhuang experimental site in central Inner Mongolia, including three stem spacing (0.9cm, 1.2cm, 1.7cm) and three width (3m, 6m, 9m) of VFS treatments plus one control treatment (no VFS). The response of the reduction of runoff and its sediment on VFS's stem spacing and width were studied, the comprehensive benefits of different treatments were evaluated by the entropy TOPSIS model, and the suitable stem spacing and width of VFS were determined. The results showed that the bigger VFS's width caused to the lower runoff and its sediment discharge under the condition of same VFS's stem spacing. Compared to VFS's width of 3m, the treatments of width of 9m and 6m decreased averagely 62.14% and 33.59% runoff, respectively; 80.97% and 60.66% for sediment, additionally, outflow time was delayed by 7min and 2min. Under the condition of same VFS's width, the decrease of VFS's stem spacing can effectively decreased runoff and its sediment. When VFS's stem spacing was 0.9cm, average sediment quantity at the end of VFS was reduced by 35.4% and 48.28% compared with that of 1.2cm and 1.7cm stem spacing, respectively; 16.5% and 18.26% reduction for runoff. So, the runoff and its sediment can be significantly affected by VFS's stem spacing and width, and there was more significant effects for runoff reduction by VFS's width. Additionally, the highly significant reduction for the sediment by their interaction effects appeared. The optimal VFS pattern with stem spacing of 0.9cm and width of 9m was obtained by TOPSIS, and there was best comprehensive benefits. The results has important guiding significance in both theory and practice for VFS construction.
宋凡凡, 李仙岳, 田德龙. 植被过滤带模式对内蒙农牧交错区截流减沙的影响及优选[J]. 中国环境科学, 2022, 42(6): 2835-2843.
SONG Fan-fan, LI Xian-yue, TIAN De-long. Optimization and influence of vegetative filter strip's pattern on reduction of runoff and its sediment in the Inner Mongolia farming-pastoral ecotone. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(6): 2835-2843.
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