Agricultural non-point source feature of drinking water source in alpine valley region of Tianlin county, Guangxi

LI Xiang-lin;XIE Hua;YANG Rui-gang;YU Meng-hao;Scientific Research Academy of Guangxi Environmental Protection;Collaborative Innovation Center of the Ecological Environment & Integration Development in the Xijiang River Basin;

alpine valley region;;drinking water source;;agricultural non-point source;;equal standard pollution load;;Tianlin county,Guangxi

【Objective】The agricultural non-point pollution feature of drinking water source in alpine valley region of Guangxi was studied, in order to provide data and scientific references for standardization and normalization management of drinking water source in villages and towns of Guangxi in future. 【Method】Taking Tianlin county, Guangxi as example,6 drinking water sources in same river basin were selected according to Tianlin county township topographical features.Then the water quality of water point were analysed, and the water environment status and pollution source distribution were investigated. The proportions of different types of agricultural non-point sources were estimated by equal standard pollution load method, so as to analyze main pollution sources and pollutants affecting water quality of water source. 【Result】The results showed that, among 6 drinking water sources,there were 3 drinking water sources whose water quality had exceeded standard slightly to be found, which had more agricultural vegetation distributed along water point. The fecal coliforms, total phosphorus(TP) and total nitrogen(TN) were 0.20-0.25, 0.20 and 2.00 times more than national standard, respectively. However, as for other 3 drinking water sources located in the mountainside without agricultural nonpoint source distribution, the water quality reached class II and class III of national standard, which met safety standards for drinking. The agricultural non-point drinking water sources of villages and towns was distributed in the low-lying valley region of Tianlin county. Moreover, the ratio of equal standard pollution load in farmland runoff pollution sources was the highest, followed by those in scattered livestock and poultry breeding pollution sources and rural life pollution sources. And the ratio of equal standard pollution load in TP was the highest, followed by that in TN. 【Conclusion】In order to ensure water safety, the prevention and control of farmland runoff pollution sources should be strengthed.