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Characteristics of Water-Soluble Phosphorus (Wsp) Loss by Runoff in a Purple Soil Watershed

Liu, Q.; Li, Z.; Li, P.; Han, J.; Zhang, Z.

Fresenius Environmental Bulletin 24(12): 4231-4238

2015

ISSN/ISBN: 1018-4619
Accession: 070758332
In this paper, ten typical rainfall events were monitored in Xujiawan Watershed from 2012 to 2013, and a comparative study of the characteristics of water-soluble P loss by runoff under natural rainfall was conducted. The results showed that as the flow-rate increased, the concentration of water-soluble P loss by runoff decreased; however, the concentration of water-soluble P lost by runoff increased linearly as the sediment concentration increased during IM-type rainfall events in Xujiawan Watershed. During the initial and final period of runoff yield, the concentration of water-soluble P loss was lower than that of the increase and decrease in flow-rate. In addition, the water-soluble P loss by runoff followed a severe waveform throughout the entire process. Moreover, the correlation between water-soluble P concentration and runoff, sediments were not obvious in the MD-type and PP-type rainfall events. During the erosion in response to two rainfall events within a short period (less than 5 days), the concentrations of soil water-soluble P loss by runoff erosion during the latter rainfall event were lower than that of the former, while the concentrations of soil water-soluble P in the runoff were the highest in the first rainfall event during a flood season.

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Related References

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