Study on the reduction and hysteresis effect of soil nitrogen pollution by Alfalfa in channel buffer bank

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Chi, Yixia^1,2 ; Xue, Lianqing^1,2 ; Zhang, Zhanyu^1 ; Li, Dongying^2

Hydrology and Water Resources College, Hohai University, Nanjing

210098, China^1

Hohai University Wentian College, Maanshan

243000, China^2

关键词: Hysteresis effect;    Migration rates;    Nitrogen pollution;    Nitrogen transport;    Pot experiment;    Purification effect;    Soil nitrogen content;    Water transfers;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/4/042031/pdf
DOI  :  10.1088/1755-1315/108/4/042031

来源: IOP

【 摘 要 】

Based on the simulation experiments of solute transport in channel buffer bank and pot experiments, this study analyzed the transport of nitrogen pollution from farmland drains along the South-North Water Transfer east route project; and compared the nitrogen transport rule and purification effect of alfalfa in channel buffer bank soil under situations of bare land and alfalfa mulching. The results showed that: (1) soil nitrogen content decreased gradually with the width increase of channel buffer bank by the soil adsorption and decomposition; (2) the migration rates of nitrogen were 0.06 g•kg-1by the alfalfa mulching; (3) the removed rates of nitrogen from the soil were 0.088 g•kg-1by cutting alfalfa; (4) the residual nitrogen of soil with alfalfa was 10% of the bare land. Alfalfa in channel buffer bank had obvious reduction and hysteresis effect to soil nitrogen pollution.