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Chinese Journal of Applied Ecology ›› 2018, Vol. 29 ›› Issue (10): 3425-3432.doi: 10.13287/j.1001-9332.201810.017

• Research paper • Previous Articles     Next Articles

Effects of vegetative filter strip on overland flow nitrogen and phosphorus intercepting under different inflow conditions

SHE Dong-li1,2*, A Limu A Bulaiti1, CHEN Qian1, HAN Xiao2   

  1. 1Ministry of Education Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China, Hohai University, Nanjing 210098, China;
    2College of Agricultural Engineering, Hohai University, Nanjing 210098, China
  • Received:2018-03-26 Online:2018-10-20 Published:2018-10-20
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51679062), the Natural Science Foundation of Jiangsu Province (BK20161503) and the Water Science and Technology Project of Jiangsu Province (2016053)

Abstract: The vegetative filter strips can effectively intercept erosion of water and sediment on the slope, with huge potential to prevent and control soil erosion and agricultural non-point source pollution. A series of muddy water scouring experiments under different inflow conditions in the indoor soil trays were conducted to investigate the effects of vegetative filter strip (VFS) on intercepting nitrogen (N) and phosphorus (P) under different inflow conditions and its internal hydrological responses. The results showed that the VFS could effectively intercept N and P in the runoff. When the inflow was 200, 400, 600 L·h-1, the intercepting rates were 74.9%, 62.0%, 58.3% for N and 85.0%, 75.6%, 72.0% for P, respectively. The best intercepting effect occurred at the lower inflow rates. Different inflow N and P concentrations had no significant effect on N and P interception efficiency. Under different inflow conditions, the intercepting rates of N and P by VFS increased with the increases of Froude value with a significant linear positive correlation. However, there were linear negative correlations between the intercepting rate and resistance coefficient, shear stress and stream power. The relationship between the N and P intercepting rates and shear stress was the best among others, and the N and P intercepting rates could be well predicted by a formula containing shear stress.