Effects of hydrological factors on nitrogen loss in small agricultural catchments
Effects of hydrological factors on nitrogen loss in small agricultural catchments
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发表时间：
2007
影响因子：
2.4
通讯作者：
Wei Lin
中科院分区：
文献类型：
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作者：
Wei Lin
通过对江西省红壤区农业小流域降雨径流引起的土壤氮素流失过程的监测，研究了降雨径流引起的土壤氮素流失与降雨径流的关系，结果表明：降雨径流初期，坡面径流中NH +4-N和全氮浓度较高;氮素的流失主要发生在4 ~ 6月，在上游旱田，氮素的流失主要发生在4 ~ 6月，在上游旱田，氮素的流失主要发生在4 ~ 6月，而在上游旱田，氮素的流失主要发生在4 ~ 6月，在上游旱田，氮素的流失主要发生在4 ~ 6月，在上游旱田，氮素的流失主要发生在4 ~ 6月，在上游旱田，氮素的流失主要发生在4 ~ 6月。NH 4 +-N、NO3--N和全氮的年流失量分别约占年流失量的74%、61%和62%，在河口分别为82%、70%和79%，年总氮流失量达43.8kg/hm 2。占农民氮肥的22.6%。
Soil nitrogen loss processes resulted from rainfall and runoff were monitored in a small agricultural catchment of red soil areas in Jiangxi Province with the aim to investigate the relationship between the soil nitrogen loss and the corresponding rainfall and runoff.The results show that the concentration of NH~+_4-N and total nitrogen in the overland runoff is high in the beginning of rainfall and runoff,and then decreases rapidly with rainfall and runoff,the concentration of NO~-_3-N shows no appreciable change.Surface runoff have an important influence on the total nitrogen loss and subsurface runoff affect the nitrogen loss.The nitrogen loss mainly occurs in April to June.In the upstream dry field,losses about 74% of annual loss for NH~+_4-N,61% for NO~-_3-N and 62% for total nitrogen take place in this period.At the basin mouth,the relevant figures were 82%,70% and 79% respectively.The annual total nitrogen loss is up to 43.8kg/hm~2,which accounts for 22.6% of nitrogen fertilized by farmers.