紫色土氮养分富集实验研究

Study on the Nitrogen Enrichment Experiment of Purple Soil

利用室内人工模拟降雨,研究了紫色土侵蚀泥沙氮养分富集度与雨强、坡度和施肥措施间的关系,从而探讨土壤氮养分富集的机理。结果表明:降雨强度越大,养分富集度越小;坡度越大,养分富集度越小;施肥后养分富集度有所增大。径流与土壤养分混合深度与养分富集度具良好的负相关关系。泥沙流失主要是<0.002mm的微团聚体和<0.02mm的粘粒,而养分富集也主要在这两部分。

Through the laboratory artificial simulation rainfall, it is studied the relationship between the nitrogen en- richment degree and the rainfall strength, slope and fertilization, so as to discuss the mechanism of soil nitrogen en- richment. The results show that the stronger the rainfall and higher the slope is, the less soil nitrogen enrichment is. After fertilization, the nitrogen enrichment degree is increased. The runoff has the good negative correlation with soil nitrogen mixing depth and nitrogen enrichment. Soil erosion is mainly caused by the soil micro -aggregate less than 0. 002mm and the soil clay less than 0.02mm, while the nitrogen enrichment also concentrated in these two parts.