Soil nitrogen and organic matter losses under water erosion

Abstract

Abstract: The results of artificial water-scoured experiment show that with the increase of water-scoured intensity,the losses of nitrate and ammonium in runoff,and those of organic matter and total N in sediment increased greatly,while the enrichment ratios of organic matter and total N in sediment reduced correspondingly.When the soils in gully hilly loess region were fertilized with same amount of NH₄NO₃,the ammonium and nitrate loss in runoff was respectively 0.9～3.5% and 8.2～19.7% of the application amount. Nitrate mainly lossed in runoff, not in sediment.The correlation coefficient of soil erosion module,organic matter and total N loss with>20μm soil aggregates was-0.8935,-0.7928 and-0.8151,respectively.The content of>20μm soil aggregates could be used as an index to differentiate the soil organic matter and total N loss.

Key words: Soil types, Water-scoured, Soil aggregate, Fertilizer N loss

ZHANG Xingchang, SHAO Mingan. Soil nitrogen and organic matter losses under water erosion[J]. Chinese Journal of Applied Ecology, 2000, (2): 231-234.

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