Environmental and economic benefits assessment of the optimal fertilization for non-point source pollution control
The impacts of"Three Controls"nutrient management technology(TCNM)for rice on rice yield,non-point source nitrogen and phosphorus loss of the Liuxi River Watershed were simulated by SWAT model,and the environmental and economic benefits were measured in the form of currency by using environmental economics method.Results showed that:when changing customary fertilization to TCNM with 11.08％N saving and 47.37％P saving,the rice yield was increased by 5.69％whereas 3.08％of total nitrogen(TN)and 11.88％of total phosphorus(TP)loss from paddy field could be reduced.When keeping current rice yield,the application of TCNM could reduce TN and TP loss by 16.62％and 15.80％with up to 46.65％N saving and up to 68.42％P saving.After considering the environmental benefit value of TN and TP loss reduction,TCNM improved the economic benefit of rice planting by 48.98％.This research indicated that optimal fertilization was effective to the reduction of agricultural non-point source pollution,and to the improvement of environmental and economic benefits.
SWAT modeloptimal fertilizationTCNMnon-point source pollutionenvironmental and economic benefits
万方数据
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