Eco-Compensation Schemes for Controlling Agricultural Non-Point Source Pollution in Maoli Lake Watershed

Maoli Lake is the water source for local residents and a national nature protected area. However, due to intensive agriculture development, quality has deteriorated over past decades. An effective measure improve control agricultural non-point (NPS) pollution through elaborate schemes based on eco-compensation. In order develop such eco-compensation schemes, three scenarios of activity adjustment were designed: S1 (halving fertilization every year), S2 (fallow other S3 (returning land forest). A Soil Water Assessment Tool (SWAT) model was adopted simulate runoff, total nitrogen, phosphorus. Based SWAT results, multi-criteria spatial evaluation considering environmental, economic, social effects created best scenario decision. The results reveal following: (1) nutrients loss reduces in all scenarios, but more reduction compared S3; (2) from comprehensive perspective environment–economy–society effects, rice dry land; (3) effect at grid scale significant difference, therefore, we highlight necessity significance controlling NPS by precise scale. This study can broaden application field provide scientific basis experience design