Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China.
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Environ Pollut. 2018 Mar;234:743-750. doi: 10.1016/j.envpol.2017.12.018. Epub 2017 Dec 21.
The hydrological and pollution processes are an important science problem for aquatic ecosystem. In this study, the samples of river water, reservoir water, shallow groundwater, deep groundwater, and precipitation in mining area are collected and analyzed. δD and δO are used to identify hydrological process. δN-NO and δO-NO are used to identify the sources and pollution process of NO. The results show that the various water bodies in Fenhe River Basin are slightly alkaline water. The ions in the water mainly come from rock weathering. The concentration of SO is high due to the impact of coal mining activity. Deep groundwater is significantly less affected by evaporation and human activity, which is recharged by archaic groundwater. There are recharge and discharge between reservoir water, river water, soil water, and shallow groundwater. NO is the main N species in the study area, and forty-six percent of NO-N concentrations exceed the drinking water standard of China (NO-N ≤ 10 mg/L content). Nitrification is the main forming process of NO. Denitrification is also found in river water of some river branches. The sources of NO are mainly controlled by land use type along the riverbank. NO of river water in the upper reaches are come from nitrogen in precipitation and soil organic N. River water in the lower reaches is polluted by a mixture of soil organic N and fertilizers.
水文和污染过程是水生生态系统的一个重要科学问题。本研究采集并分析了矿区河水、水库水、浅层地下水、深层地下水和降水的样本。δD 和 δO 用于识别水文过程，δN-NO 和 δO-NO 用于识别 NO 的来源和污染过程。结果表明，汾河流域的各种水体均呈弱碱性水，水中的离子主要来源于岩石风化。由于采煤活动的影响，SO 的浓度较高。深层地下水受蒸发和人类活动的影响较小，主要由古地下水补给。水库水、河水、土壤水和浅层地下水之间存在补给和排泄关系。NO 是研究区的主要 N 物种，46%的 NO-N 浓度超过中国饮用水标准（NO-N≤10mg/L）。硝化作用是 NO 形成的主要过程。在一些支流的河水中也发现了反硝化作用。NO 的来源主要受河岸土地利用类型的控制。上游河水的 NO 来自降水和土壤有机氮中的氮，下游河水则受到土壤有机氮和肥料的混合污染。
