Abstract
The landscape structure of a multipond system, runoff type andP-pollutant transport in an experimental watershed was studiedduring 1995 and 1998. A multipond system is a wetland system composed with many tiny ponds and ditches. In this watershed, it was found that such a system effectively controls the hydrological process through its huge storage capacity. The multipond system has a high interaction of land/water ecotones,which decreases the flow velocity systematically and results ina high sedimentation of the particulate matters.The multipond system intercepts runoff and creates either continuous or discontinuous flow. The retention efficiency of the system was very high in both cases but differed in nature. During continuous runoff on 1 May 1998, in a subwatershed Baojiatang, the retention rates of water, total phosphorus (TP),dissolved phosphorus (DP) and suspended solids (SS) by the multipond system were 83.0, 93.9, 90.9 and 94.9%, respectively.During discontinuous runoff on 29 June 1998, runoff volume generated from all lands was 1841 m3, but no surface waterwas exported and the system retention rates of TP, DP and SS were nearly complete. The removal of particulate phosphorus bythe system was more effective than removal of DP and thus DP wasthe main form of phosphorus exported from the watershed duringcontinuous flow. Because of such control, the export amount ofphosphorus was greatly reduced. The output of TP and DP was 0.013 and 0.012 kg ha-1, respectively, from Liuchahe watershed in 1995, and they were 0.037 and 0.030 kg ha-1 in 1998 correspondingly.
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Shan, B., Yin, C. & Li, G. Transport and Retention of Phosphorus Pollutants in the Landscape with a Traditional, Multipond System. Water, Air, & Soil Pollution 139, 15–34 (2002). https://doi.org/10.1023/A:1015886316782
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DOI: https://doi.org/10.1023/A:1015886316782