HUBEI AGRICULTURAL SCIENCES ›› 2022, Vol. 61 ›› Issue (12): 38-44.doi: 10.14088/j.cnki.issn0439-8114.2022.12.008

• Resource & Environment • Previous Articles     Next Articles

Experimental study on nitrogen and phosphorus loss from slope in different vegetative filter strips by artificial rainfall

YOU Qin-jing, ZHANG Hua-yong, HUANG Tou-sheng, ZHANG Fei-fan, ZHENG Yu-yang, ZHOU Wen-jiao   

  1. Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing 102206, China
  • Received:2021-01-18 Online:2022-06-25 Published:2022-07-22

Abstract: Vegetative filter strip is one of the effective measures to control soil and water loss. In this research, the artificial rainfall experiment was carried out with soil tanks. Under different slope gradients (5°,20°, 35°), rainfall intensities (30,60,90 mm/h) and vegetation setting modes (whole block arrangement, two pieces arrangement), the time variation of total nitrogen and total phosphorus content in runoff and sediment on the eroded slope was comparatively analyzed. The results showed that the change trend of total nitrogen or total phosphorus content with time in different combinations was not completely consistent, but the change trend among individual combinations was the same; the combination of rainfall intensity, slope gradient and vegetation setting mode had a comprehensive impact on the total nitrogen and total phosphorus removal by the vegetative filter strip, which was different from that of each single factor; the application of vegetative filter strip on a slope should be combined with local climate and terrain conditions. The results of this study can provide a reference for the design of vegetative filter strip to prevent soil and water loss on the erosive slope of small watersheds in northern China.

Key words: vegetative filter strip, erosion channel, slope runoff and sediment, nitrogen and phosphorus loss, artificial rainfall

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