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Published on: August 7, 2010
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Quantitative evaluation of legacy phosphorus and its spatial distribution
Hezhen Lou1, Changsen Zhao1, Shengtian Yang1
1College of Water Sciences, Beijing Normal University, Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities, Beijing 100875, China.
Journal of Environmental Management
|February 7, 2018
Summary
A phosphorus resource crisis looms, but legacy phosphorus (legacy-P) in soil offers a solution. This study quantifies legacy-P in China
Area of Science:
- Agricultural Science
- Environmental Science
- Soil Science
Background:
- Global phosphorus (P) resource scarcity threatens crop production, particularly in developing nations.
- Over-fertilization has led to significant accumulation of legacy phosphorus (legacy-P) in agricultural soils.
- Accurate quantification and spatial mapping of legacy-P are crucial for its effective utilization.
Purpose of the Study:
- To precisely quantify legacy phosphorus (legacy-P) and map its spatial distribution in China's Sanjiang Plain.
- To develop and apply a novel methodology integrating remote sensing and ecohydrological modeling for legacy-P assessment.
- To provide a foundation for utilizing legacy-P to mitigate the phosphorus resource crisis.
Main Methods:
- Application of remote sensing techniques to gather relevant environmental data.
- Utilization of ecohydrological modeling to simulate phosphorus dynamics in soil.
- Integration of remote sensing and modeling data for precise legacy-P quantification and spatial analysis.
Main Results:
- Calculated total legacy-P in the Sanjiang Plain at 579,090 tons, averaging 38,600 tons annually.
- Legacy-P constituted 51.83% of the annual phosphorus fertilizer applied.
- Observed a 3.42-fold increase in annual legacy-P from 2000 to 2014, with a spatial heterogeneity and agglomeration pattern.
Conclusions:
- Developed a novel approach for quantifying and mapping soil legacy-P using remote sensing and ecohydrological modeling.
- Demonstrated the significant and increasing contribution of legacy-P to the soil phosphorus pool in the study area.
- Highlighted the potential of legacy-P as a valuable resource to address the global phosphorus crisis and enhance agricultural sustainability.
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