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《ACTA SCIENTIAE CIRCUMSTANTIAE》 2000-03
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Sediment enrichment mechanisms of phosphorus under simulated rainfall conditions

YAN Weijin, ZHANG Shen, TANG Yijian\ (Institute of Geography, CAS, Beijing 100101)  
The study on mechanisms of soil aggregates detachment by rainfall and loss by runoff was conducted to seek explanation for the enrichment of PP in eroded sediment and original soil (Meadow Drab Soil) in a rainfall simulation experiment with a constant rainfall rate of 72?mm?h -1 . The results showed that the aggregate size distribution of the eroded sediment was drastically different to that of the original soil. More than 80% of total P transported by runoff was in the particulate form, whereas 60%—90% of PP lost with finer aggregates smaller than 0 1?mm. The study demonstrated that both the PP enrichment mechanism and enrichment ratio (ER) are different for different aggregate sizes. The ER for both larger aggregates (0 1mm) and finer aggregates (0 045?mm) is higher than that of intermediate one (0 1—0 045?mm). The enrichment mechanism of larger aggregates is due to the higher proportion of organic matter, while the higher content of clay in finer sediment is responsible for that of finer aggregates. A simple enrichment equation is proposed to predict the loss of PP: ln ER=1 15—0 22?ln[soil loss].
【Fund】: 国家自然科学基金 (批准号 4980 10 19);; 国家“九五”重大基金! (批准号 39790 10 0 )
【CateGory Index】: X144
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