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Use of the Spatial Matching of Source and Sink Landscapes to Control Non-Point Source P Pollution in Agricultural Watershed.
Author(s): 
Pages: 46-50
Year: Issue:  3
Journal: Rural Eco-Environment

Keyword:  agricultural field systemsink landscape structurenon-point source pollution controlnutrient retention;
Abstract: Based on field investigations,chemical analysis of drainage water samples,and field experiments,possibility of controlling non-point source P pollution by matching source and sink landscapes was studied in agricultural watershed.In the agricultural watershed of Zhejiang Province,the major types of source and sink landscapes are vegetable-rice system,vegetable-wild rice system,mulberry-rice system,upland-paddy system,high fertilization rate paddy field-low fertilization rate paddy field system,farmland-multipond system,and farmland-grassy ditch system.P concentration in drainage water from the fields varied with land use,showing a decreasing order of mulberry garden>vegetable land>paddy field,wheat field,rapeseed field>fallow land>wild rice field.Field experiments verified that all the four systems,i.e.vegetable-rice-wild rice system,vegetable-rice system,mulberry-rice system,and vegetable-multipond system,significantly reduced P loss from the systems.Artificial or natural nutrient sink landscapes,such as grassy ditch,grassy filter strip,ponds,and some paddy fields,that are widely distributed in the agricultural system effectively increased P-holding time in the system,and reduced P loss to waters.It is suggested that in agricultural watersheds high in P loss,the runoff of non-point source pollutants could be controlled by adjusting land use structure and increasing the area of nutrient sink landscapes.
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