Fig. 4From: How much do the conventional parameters contribute to the biological toxicity of surface water in different types of villages?The concentration of A total nitrogen (TP), B PO43−-P, C chemical oxygen demand (COD) and D total organic carbon (TOC) in different types of village surface water. Ag.: agricultural village; A.&B.: agriculture and breeding mixed village; Br.: breeding village; Ha.: handicraft village; In.: industrial village; To.: tourism villageBack to article page