[Spatial and Temporal Distribution Characteristics and Source Analysis of Agricultural Non-point Source Pollution in Henan Province from 2001 to 2021]
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Summary
This summary is machine-generated.Agricultural non-point source pollution in Henan Province shows decreasing trends for chemical oxygen demand (COD) and total nitrogen (TN) but increasing total phosphorus (TP) from 2001-2021. Livestock farming and fertilizer use are key pollution sources, necessitating targeted control strategies.
Area Of Science
- Environmental Science
- Agricultural Science
- Water Quality Management
Background
- Agricultural non-point source pollution is a significant threat to China's water bodies, particularly in major grain-producing regions like Henan Province.
- Irrational use of pesticides and fertilizers exacerbates pollution, impacting water environment and ecological security.
Purpose Of The Study
- To estimate the pollution load of chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP) from agricultural non-point sources in Henan Province (2001-2021).
- To analyze the spatial and temporal distribution characteristics and emission intensities of these pollutants.
- To identify the primary sources contributing to agricultural non-point source pollution.
Main Methods
- Inventory analysis was employed to quantify pollution loads (COD, TN, TP) from 2001 to 2021.
- Spatial and temporal distribution patterns of pollution loads and emission intensities were elucidated.
- Source apportionment was conducted to identify key contributors to pollution.
Main Results
- Temporal trends (2001-2021) show decreasing COD and TN loads/intensities, but increasing TP loads/intensities.
- Pollution loads exhibit spatial clustering, with high values concentrated in southern (Nanyang, Zhumadian, Xinyang) and eastern (Shangqiu, Zhoukou) Henan. Emission intensities vary regionally, generally higher in the east and north.
- Livestock and poultry farming are primary sources for COD, while chemical fertilizers and livestock farming contribute most to TN and TP. Nanyang, Zhumadian, and Zhoukou are major contributing areas.
Conclusions
- Agricultural non-point source pollution in Henan displays distinct temporal shifts and significant spatial disparities.
- Dual control strategies ('load control-intensity constraint') are recommended for pollution risk management.
- Promoting fertilizer reduction, manure utilization, and straw resource management are crucial for pollution mitigation.
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