Effects of the hydrologic process and geochemistry on dissolved carbon in shallow groundwater surrounding Qinghai Lake

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research Pub Date : 2024-04-12 DOI:10.1016/j.jglr.2024.102349

Dongsheng Li , Buli Cui , Yunduo Zhao

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引用次数: 0

Abstract

A high concentration of dissolved carbon in groundwater increases drinking water health risks and carbon transport. Understanding the comprehensive impact of hydrologic processes and geochemistry on dissolved carbon in shallow groundwater also is a fundamental prerequisite for estimating the carbon budget of lakes in the Tibetan Plateau. This study investigated the spatial–temporal characteristics of the hydrologic process, geochemistry and dissolved carbon in shallow groundwater by the stable isotope tracer method, Piper diagram and Boomerang envelope model. The driving factors of dissolved carbon in shallow groundwater were explored by correlation analysis and redundancy analysis. The results showed low dissolved inorganic carbon (DIC) concentrations and high dissolved organic carbon (DOC) concentrations during the thawing period and rainy season and high DIC concentrations and low DOC concentrations during the freezing period. The seepage velocity, soil carbon dioxide dissolution and gypsum dissolution were the main factors influencing DIC concentrations during the thawing period. The mineralization and decomposition of DOC and dissolution of carbonate rocks were the main factors influencing DIC concentrations during the freezing period. The concentrations of DOC were mainly controlled by the adsorption of Ca²⁺ and Mg²⁺, microbial activity and pollutants produced by human activities. Our results are useful for ecological sustainable development, human health, and research on the carbon transport in groundwater in the Tibetan Plateau.

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水文过程和地球化学对青海湖周边浅层地下水溶解碳的影响

地下水中高浓度的溶解碳会增加饮用水的健康风险和碳迁移。了解水文过程和地球化学对浅层地下水溶解碳的综合影响也是估算青藏高原湖泊碳预算的基本前提。本研究采用稳定同位素示踪法、Piper 图和 Boomerang 包络模型研究了浅层地下水水文过程、地球化学和溶解碳的时空特征。通过相关分析和冗余分析，探讨了浅层地下水溶解碳的驱动因素。结果表明，解冻期和雨季溶解无机碳（DIC）浓度低、溶解有机碳（DOC）浓度高，冰冻期溶解无机碳（DIC）浓度高、溶解有机碳（DOC）浓度低。渗流速度、土壤二氧化碳溶解和石膏溶解是影响解冻期 DIC 浓度的主要因素。DOC 的矿化和分解以及碳酸盐岩的溶解是影响冻结期 DIC 浓度的主要因素。DOC的浓度主要受Ca2+和Mg2+的吸附、微生物活动和人类活动产生的污染物的控制。我们的研究结果对青藏高原的生态可持续发展、人类健康以及地下水中碳迁移的研究都很有帮助。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Great Lakes Research 生物-海洋与淡水生物学

CiteScore

5.10

自引率

13.60%

发文量

178

审稿时长

6 months

期刊介绍： Published six times per year, the Journal of Great Lakes Research is multidisciplinary in its coverage, publishing manuscripts on a wide range of theoretical and applied topics in the natural science fields of biology, chemistry, physics, geology, as well as social sciences of the large lakes of the world and their watersheds. Large lakes generally are considered as those lakes which have a mean surface area of >500 km2 (see Herdendorf, C.E. 1982. Large lakes of the world. J. Great Lakes Res. 8:379-412, for examples), although smaller lakes may be considered, especially if they are very deep. We also welcome contributions on saline lakes and research on estuarine waters where the results have application to large lakes.