Modeling the Impact of Land Use Optimization on Non-Point Source Pollution: Evidence from Chinese Reservoir Watershed

Guanghui Li, Lei Chang, Haoye Li and Yuefen Li ()
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Guanghui Li: College of Earth Sciences, Jilin University, Changchun 130061, China
Lei Chang: College of Earth Sciences, Jilin University, Changchun 130061, China
Haoye Li: College of Earth Sciences, Jilin University, Changchun 130061, China
Yuefen Li: College of Earth Sciences, Jilin University, Changchun 130061, China

Land, 2023, vol. 13, issue 1, 1-17

Abstract: We assessed the effectiveness of land optimization for controlling non-point source (NPS) pollution by combining a multi-objective dynamic planning approach with the application of the Land Use and its Effects at Small regional extents model and the Soil and Water Assessment Tool. The combined modeling approach showed substantial ability to reduce NPS pollution in Shitoukoumen Reservoir, Changchun City, China, reducing the annual total loads of nitrogen and phosphorus in the study area by 8.7 and 10.12%, respectively. The total nitrogen load decreased significantly and stabilized at less than 8 kg/hm 2 from a peak level of over 15 kg/hm 2 . Higher total phosphorus loads before land use optimization were concentrated in the central parts of the study area, with the highest values exceeding 2.3 kg/hm 2 , and tended to spread outward but resolved at 1.5 kg/hm 2 after optimization. The results showed that from a macro-perspective, optimization of the spatial distribution and quantitative composition of land use can effectively control NPS pollution. The study also demonstrates the potential effectiveness of the coupled multi-model methodology for mitigating NPS in the future.

Keywords: optimizing land allocation; NPS pollution; CLUE-S; SWAT; Shitoukoumen Reservoir Watershed (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2023
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