Abstract
Critical periods (CPs) and critical source areas (CSAs) refer to the high-risk periods and areas of nonpoint source (NPS) pollution in a watershed, respectively, and they play a significant role in NPS pollution control. The upstream Daning River Basin is a typical watershed in the Three Gorges Reservoir area. In this study, a Hydrological Simulation Program-Fortran (HSPF) model was used to simulate phosphorus loss in the upstream Daning River Basin. Co-analysis of critical periods and critical source areas (CACC) is a quantitative collaborative analysis method for the identification of CSAs in CPs, and it was used to classify the periods and areas of NPS pollution as CPs, sub-CPs, non-CPs, CSAs, and non-CSAs. The CPs occurred in months 5–7 and accounted for 53.7% of the total phosphorus (TP) loads, and the sub-CPs occurred in months 1, 3, 4, and 8 and accounted for 29.2% of the TP loads. In CSAs, 49.4% of the TP loads occurred in 26.8% of the basin. Furthermore, we proposed the following multilevel priority control measure for NPS pollution in the upstream Daning River Basin: CSAs in CPs (with load-area rate of 1.4), CSAs in sub-CPs (0.7), CSAs in non-CPs (0.4), non-CSAs in CPs (0.3), non-CSAs in sub-CPs (0.2), and non-CSAs in non-CPs (0.1). CSAs in CPs accounted for 25.8% of the TP loads from 19.0% of the areas in only 3 months while 49.4% of the TP loads from similar areas over an entire year. These findings indicated that the CSAs in CPs located in farmland along the Daning, Dongxi, and Houxi Rivers should be prioritized for pollution management measures.
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Funding
This study was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences [grant number XDA23040403], the CRSRI Open Research Program of China [grant number CKWV2017531/KY], the Hubei Provincial Natural Science Foundation of China [grant numbers 2016CFA058], the Hubei Technological Innovation Special Fund of China [grant number 2018ACA148], and the Youth Innovation Promotion Association, CAS [grant number 2018370 and 2016304].
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Ruan, S., Zhuang, Y., Hong, S. et al. Cooperative identification for critical periods and critical source areas of nonpoint source pollution in a typical watershed in China. Environ Sci Pollut Res 27, 10472–10483 (2020). https://doi.org/10.1007/s11356-020-07630-w
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DOI: https://doi.org/10.1007/s11356-020-07630-w