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. 2015 Nov 18;5:16617. doi: 10.1038/srep16617

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(a) Contents of total phosphorus and (b) sequential extraction based phosphorus fractionations in the sediment profile of Sancha reservoir. Org-P: organic phosphorus; HCl-P: calcium-bound phosphorus; NaOH-P: metal oxide-bound phosphorus; NH₄F-P: aluminium-bound phosphorus; MgCl₂-P: exchangeable phosphorus; Re-P: residual phosphorus and (c) Historic development of annual antrhopogenic discharge of phosphorus (in t a⁻¹) and the percentage of different natural and anthropogenic inputs into Sancha reservoir, Sichuan Province, China. Data presented in Figure 2c comes from Jianyang Archives Bureau, Sichuan Meteorological Bureau, Sichuan Statistical Bureau, Jianyang Statistical Bureau, Jiangyang Environmental Protection Bureau, and Sichuan Environmental Protection Bureau.