AI Article Synopsis
- Runoff samples from different cropping systems were collected in the Nansi Lake region to analyze various forms of nitrogen (N) and phosphorus (P), along with river samples to determine their concentrations.
- Principal component analysis (PCA) was utilized to identify non-point pollution sources of N and P, revealing three main sources accounting for 95.275% of the total variance.
- The major contributor to contamination was runoff from a wheat-maize rotation, accounting for 50.220%, followed by garlic-maize rotation at 25.119%, and wheat-rice rotation at 19.937%.
Article Abstract
Field runoff pools were used to collect the field surface runoff samples of different cropping systems in Nansi Lake region, and different forms of nitrogen (N) and phosphorus (P) data were analyzed. The source profiles of N and P in different cropping systems were also obtained by summarizing the experimental data measured in the current study. Samples were also collected from the 11 main rivers of Nansi Lake basin and the concentrations of N and P were determined. Principle component analysis (PCA) was applied to obtain cropping non-point pollution sources of N and P. The result showed that three types of N and P contamination sources were apportioned in Nansi Lake basin, explaining 95.275% of the total variance. The first source was from field surface runoff of wheat-maize rotation with a wide pollution range and a larger contribution, and it contributed 50. 220% of the total contamination burden; the second type of N and P source was the water runoff pollution from garlic-maize rotation, were 25.119% contribution; the third source was the surface runoff from wheat-rice rotation, and it contributed 19.937%.
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