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• W2982672015 abstract "Excessive nitrogen (N) and phosphorus (P) runoff from human activities results in degraded water quality. It is, therefore, crucial to quantitatively assess nutrient inputs over time and their impact on riverine nutrient exports. In this study, we estimated the long-term (1995–2015) nutrient inputs at the county scale by integrating Net Anthropogenic Nitrogen Input (NANI) and Net Anthropogenic Phosphorus Input (NAPI) methods, and nutrient exports into rivers by the Export Coefficient Model (ECM) for a semiarid plain basin, the Baiyangdian (BYD) Basin, China. The results showed that N and P input intensities in the year 2015 reached 18852 kg N km2 yr−1 and 2073 kg P km−2 yr−1, showing a 35% and 11% increase in comparison with 1995, respectively. About 60% of these nutrients were derived from fertilizer application. The multi-year averaged N and P exported to rivers was 548 kg N km−2 yr−1 and 79 kg P km−2 yr−1, respectively. Hotspots for nutrient budgets were found in the southeastern counties. Hotspots covered about 12% of the total land, but contributed by 38–52% of total nutrient budgets. The nutrient export ratios showed no significantly temporal variations, and only about 2.15–2.89% of NANI and NAPI were exported into rivers. The low nutrient export ratio was due to the low water discharge that limited the nutrient transportation in the semi-arid plain basin. As most of anthropogenic nutrient inputs were retained in the basin, their impacts on the pollution of soils and aquifers need to be considered and adequately addressed in the future. This study constructs the spatial quantitative nutrient budgets, which can provide effective information for region policy formulation." @default.
• W2982672015 created "2019-11-08" @default.
• W2982672015 creator A5019860038 @default.
• W2982672015 creator A5034101727 @default.
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• W2982672015 date "2020-02-01" @default.
• W2982672015 modified "2023-10-16" @default.
• W2982672015 title "Nitrogen and phosphorus retention budgets of a semiarid plain basin under different human activity intensity" @default.
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• W2982672015 doi "https://doi.org/10.1016/j.scitotenv.2019.134813" @default.
• W2982672015 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31731160" @default.
• W2982672015 hasPublicationYear "2020" @default.
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