Regional Differences in the Impact of Land Use Pattern on Total Phosphorus Concentration in the Yangtze River Basin

Fuliang Deng, Wenhui Liu, Wei Liu, Yanxue Xu (), Yuanzhuo Sun, Chen Zhang, Mei Sun and Ying Yuan
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Fuliang Deng: School of Computer and Information Engineering, Xiamen University of Technology, Xiamen 361024, China
Wenhui Liu: School of Computer and Information Engineering, Xiamen University of Technology, Xiamen 361024, China
Wei Liu: School of Computer and Information Engineering, Xiamen University of Technology, Xiamen 361024, China
Yanxue Xu: United Center for Eco-Environment in Yangtze River Economic Belt, Chinese Academy of Environmental Planning, Beijing 100041, China
Yuanzhuo Sun: School of Computer and Information Engineering, Xiamen University of Technology, Xiamen 361024, China
Chen Zhang: School of Computer and Information Engineering, Xiamen University of Technology, Xiamen 361024, China
Mei Sun: School of Computer and Information Engineering, Xiamen University of Technology, Xiamen 361024, China
Ying Yuan: School of Computer and Information Engineering, Xiamen University of Technology, Xiamen 361024, China

Land, 2025, vol. 14, issue 2, 1-17

Abstract: Accurately assessing the impact of land use patterns on total phosphorus (TP) concentration in surface water is crucial for protecting the water environment of the Yangtze River Basin (YRB). However, due to the heterogeneity of land use patterns, the regional differences in the intensity and direction of their impacts on TP concentrations in the YRB remain insufficiently understood. This study utilizes water quality monitoring data from state-controlled sections in 2021 and employs spatial autocorrelation analysis, geographic detectors, and Pearson correlation models to identify the impacts of land use on TP concentrations at multiple scales across the YRB. The results indicate that TP concentrations at 98.8% of the monitoring stations in the YRB exceed the Class III standard, with high concentrations of TP concentrated in the Pudu River Basin, Chengdu Plain, Jianghan Plain, and Yangtze River Delta regions. At the YRB scale, the spatial pattern of built-up land, cropland, and industrial and mining land significantly increases TP concentrations, while the pattern of forest and grassland areas exert mitigating effects. At the sub-basin scale, the impact of land use patterns on TP concentrations varies regionally. Specifically, TP concentrations in the Pudu River Basin are primarily attributed to the spatial pattern of industrial and mining land, in the Chengdu Plain to the spatial pattern of cropland and industrial and mining land, and in the Jianghan Plain to the spatial pattern of cropland, built-up land, and industrial and mining land. These results provided decision support for TP concentration control strategies and effective mitigation measures.

Keywords: land use type; total phosphorus concentration; GeoDetector; regional differences; Yangtze River Basin (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2025
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