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应用生态学报 ›› 2018, Vol. 29 ›› Issue (10): 3425-3432.doi: 10.13287/j.1001-9332.201810.017

• 研究论文 • 上一篇    下一篇

不同入流条件下植被过滤带对坡面径流氮、磷的拦截效果

佘冬立1,2*, 阿力木·阿布来提1, 陈倩1, 韩笑2   

  1. 1河海大学南方地区高效灌排与农业水土环境教育部重点实验室, 南京 210098;
    2河海大学农业工程学院, 南京 210098
  • 收稿日期:2018-03-26 出版日期:2018-10-20 发布日期:2018-10-20
  • 通讯作者: E-mail: shedongli@hhu.edu.cn
  • 作者简介:佘冬立,男,1980年生,教授,博士生导师. 主要从事农田水土过程与侵蚀控制研究. E-mail: shedongli@hhu.edu.cn
  • 基金资助:
    本文由国家自然科学基金项目(51679062)、江苏省自然科学基金项目(BK20161503)和江苏省水利科技项目(2016053)资助

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)

摘要: 植被过滤带能有效拦截坡面径流泥沙,在防治水土流失和农业面源污染等方面具有重大潜力.为探讨不同入流条件下植被过滤带对坡面径流氮、磷的拦截效果及其水动力学机理,本研究通过模拟上方来水冲刷试验,定量分析了上方来水流量、氮磷含量浓度等因素影响下植被过滤带对径流氮、磷的拦截规律及其与径流水动力学参数之间的关系.结果表明: 植被过滤带能有效拦截上方来水中氮、磷等污染物,入流流量分别为200、400、600 L·h-1时,模拟植被过滤带对总氮的拦截率分别为74.9%、62.0%、58.3%,对总磷拦截率分别为85.0%、75.6%、72.0%,在上方来水流量较低时拦截效果最优;上方来水入流氮、磷浓度变化对植被过滤带拦截效率的影响不显著.不同入流条件处理下,植被过滤带对氮、磷的拦截率随弗洛德数增大而增大,呈显著线性正相关关系;与阻力系数、水流剪切力、水流功率呈线性负相关关系;其中,氮、磷拦截率与水流剪切力的相关关系最优,可以用含水流剪切力的公式表征植被过滤带对氮、磷的拦截效率.

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.