Yu Shil, Sun Ping-an, Du Wen-yue, He Shi-yi, Li Rui
Huan Jing Ke Xue. 2015 Jan;36(1):72-9.
In this paper, observation and sampling were taken three times a month in a hydrological year for three typical sections of the middle and upper reaches of the Xijiang River basin, based on the data of hydrochemistry and flow, the article mainly discusses the evolution process of hydrochemistry in river under natural process and impact of human activity. Hydrochemical characteristics of 116. samples were analyzed in the study area. The hydrochemistry type in the middle and upper reaches of the Xijiang River basin belonged to HCO3- -Ca2+ type, and the chemical weathering type mainly came from carbonate rock weathering. Ca2+ and HCO3- were the main cations and anions, which reflected that hydrochemical characteristics of river in karst area mainly affected by the dissolution of carbonate rock. Na, Mg2, Ca2+ and Cl- mainly affected by natural conditions, the impact of human activity was little. K+, NO3-, SO4(2-) and HCO3- were affected by human activity in different degrees, and it showed different influence ways. This study had an important significance for the change of river hydrochemistry, water quality characteristics, and the effect on substance transported fluxes in the downstream of Pearl River and water quality protection in South China Monsoon Area.
本文以西江流域中上游三个典型断面为研究对象，在一个水文年内每月进行三次观测与采样，基于水化学和流量数据，主要探讨了自然过程下河流水化学的演化过程以及人类活动的影响。对研究区域内116个样品的水化学特征进行了分析。西江流域中上游水化学类型属于HCO₃⁻ -Ca²⁺型，化学风化类型主要源于碳酸盐岩风化。Ca²⁺和HCO₃⁻是主要的阳离子和阴离子，这反映出岩溶地区河流的水化学特征主要受碳酸盐岩溶解的影响。Na⁺、Mg²⁺、Ca²⁺和Cl⁻主要受自然条件影响，人类活动影响较小。K⁺、NO₃⁻、SO₄²⁻和HCO₃⁻受人类活动不同程度的影响，且表现出不同的影响方式。本研究对于河流水化学变化、水质特征以及对珠江下游物质输移通量的影响和华南季风区水质保护具有重要意义。
