Study on the reduction and hysteresis effect of soil nitrogen pollution by Alfalfa in channel buffer bank
Abstract
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-1 by the alfalfa mulching; (3) the removed rates of nitrogen from the soil were 0.088 g·kg-1 by 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.
- Publication:
-
IOP Conference Series: Earth and Environmental Science
- Pub Date:
- January 2018
- DOI:
- 10.1088/1755-1315/108/4/042031
- Bibcode:
- 2018E&ES..108d2031C