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New modeling framework for describing the effects of landscape pattern changes on nutrient pollution transport
Yuexin Zheng1, Chong Li2, Qianyang Wang3
1College of Urban and Environmental Sciences, Peking University, Beijing 100871, China; College of Water Sciences, Beijing Normal University, Beijing 100875, China.
The Science of the Total Environment
|December 25, 2024
Summary
A new model quantifies nutrient pollution transport influenced by landscape patterns. It found that forest and urban areas, specific slopes, and lower elevations drive higher pollution migration, while complex boundaries can impede it.
Area of Science:
- Environmental Science
- Hydrology
- Geospatial Analysis
Background:
- Landscape patterns significantly influence hydrological processes and pollutant transport.
- Quantitative tools for assessing nutrient pollution under diverse landscape patterns are lacking.
- Understanding these dynamics is crucial for effective water resource management and pollution control.
Purpose of the Study:
- To introduce a novel modeling framework, the Landscape Pattern-Source Flow Sink (LP-SFS) model, for quantifying nutrient pollution transport.
- To analyze the impact of landscape patterns, topography, and land use on nutrient migration intensity.
- To provide a tool for nutrient pollution control in large-scale, heterogeneous watersheds.
Main Methods:
- Development of the Landscape Pattern-Source Flow Sink (LP-SFS) model with three modules: emission, land transport, and river transport.
- Conceptual and operational characterization of pollutant transport paths on landscape units.
- Quantification of the blocking effect of grid-scale landscape units on nutrient transport.
- Application and simulation using the Luanhe River Basin as a case study.
Main Results:
- Terrestrial pollutant migration intensity was highest in regions dominated by forest and urban land cover.
- Nutrient pollution transport intensity peaked at 4.55 kg/km² in slope zones of 25-35° due to erosion.
- Lower elevations (<700 m) with concentrated urban and cultivated land showed increased terrestrial pollutant migration.
- Complex boundaries of forest and grassland reduced nutrient transport capacity, retaining pollutants in soil.
Conclusions:
- The LP-SFS model effectively quantifies nutrient pollution transport influenced by landscape patterns.
- Specific landscape configurations (e.g., FU areas, slopes, elevations) significantly impact pollution migration.
- The model is applicable to large-scale, fragmented watersheds, offering valuable insights for pollution control and land resource management.
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