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Chemical and biological characteristics of the headwater stream of the Qingjiang River (mean ± standard deviation). Vertical lines indicate standard deviation. Figure i, ii, iii and iv denote TN, TP, Chla and CODMn concentrations, respectively. Letters a and b indicate significant (p < 0.05) differences for physicochemical factors. Sampling sites that do not have a significantly different concentrations share a common letter.
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