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中国农学通报

中国农学通报 ›› 2004, Vol. 20 ›› Issue (5): 148-148.

所属专题： 土壤重金属污染

• 目次 • 上一篇    下一篇

滇池流域农田土壤氮污染负荷影响因素研究

张乃明,张玉娟,陈建军,李成学   

  • 出版日期:2004-10-05 发布日期:2004-10-05

Factors of Influencing Soil-nitrogen Pollution Load of Sloping Field in the Dian Lake Watershed

Zhang Naimingm, Zhang Yujuan, Chen Jianjun, Li Chengxue   

  • Online:2004-10-05 Published:2004-10-05

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摘要： 采取模拟试验的方法，研究了在人工降雨和自然降雨条件下，坡度、土壤质地、地表覆盖状况以及施肥方式对坡地农田径流中氮素污染负荷的影响。结果表明：随着坡度的增加，农田土壤径流中氮的浓度和氮的输出量都增加；在人工模拟降雨和自然降雨条件下，土壤径流中氮的浓度变化趋势相同，都随着质地的变粗而减少；和裸地相比，种植小麦能明显减少土壤径流中氮的浓度和输出量，氮的流失量减少范围在11.80~238.46kg/hm2之间；相同施肥量条件下，面施氮肥时土壤径流中氮的浓度和输出量比穴施时明显增加。

Abstract: Simulated experiment was used in this experiment to study the effects of soil factors on the farmland nitrogen losses and its concentration under artificial rainfall and natural rainfall. A number of soil and landscape factors were taken into account such as slope gradient, plant covers, fertilizers’ application performances as well as rainfall intensity. The result showed: the concentration of total nitrogen (TN) and the loss rate increased when the slope gradient became high; there has no significant difference in TN concentration between under artificial rainfall and under natural rainfall, TN concentration in runoff is smaller with the courser soil texture; and obviously lower with wheat planting than without covering, among which the loss decreased 11.80~238.46kg/hm2; in condition of the same N application account, diffuse application of fertilizer caused more nitrogen loss than cave application.