Affiliations: Research Center for Eco-Environmental Sciences,
Chinese Academy of Sciences, Beijing 100085, China | Chinese Academy for Environmental Planning, Beijing
100012, China
Abstract: A case study on the transport process of agricultural diffuse
P-pollutants was conducted in an experimental watershed locating in the north
bank of Yuqiao Reservoir during 2001 and 2002. It was found that diversified
artificial and natural buffer/detention landscape structures distributing along
the ephemeral stream channel in this watershed played an important role of
pollutants removal on downstream water quality, especially they have control
effect on the diffuse P-pollutants transport process. Surface flow velocity was
reduced sharply after passing through these structures. During continuous
runoff events, the removal rate of TSS, TP, TDP, DRP by the whole system were
66.7%, 60.7%, 48.4%, and 43.3%, respectively. During discontinuous runoff
events, removal rate of pollutants by the whole system was higher due to there
was no or little surface water and pollutants exported from the watershed, of
which removal rate of pollutants all exceeded 99%. The statistical analysis
results of runoff events (n = 8) indicated that dry pond was the steadiest
structure for controlling diffuse P-pollutants export.
Keywords: diffuse P-pollutants, buffer/detention structures, removal, transport process, water quality
