地下水蒸发排泄区无机碳迁移——以呼和浩特盆地为例  

Migration of Inorganic Carbon in Groundwater Evaporation Discharge Areas——A Case Study of Hohhot Basin

作　　者：李璐 燕亚平 史晓珑 董少刚 马铭言 刘凡瑶 雷君豪 LI Lu;YAN Yaping;SHI Xiaolong;DONG Shaogang;MA Mingyan;LIU Fanyao;LEI Junhao(School of Ecology and Environment,Inner Mongolia University,Hohhot 010021,China;Inner Mongolia Academy of Ecological Environment Science Company Ltd.,Hohhot 010015,China;Inner Mongolia Autonomous Region Environmental Monitoring Station Hohhot Sub-Station,Hohhot 010030,China)

机构地区：[1]内蒙古大学生态与环境学院,呼和浩特010021 [2]内蒙古生态环境科学研究院有限公司,呼和浩特010015 [3]内蒙古自治区环境监测总站呼和浩特分站,呼和浩特010030

出　　处：《地球与环境》2024年第5期567-575,共9页Earth and Environment

基　　金：国家自然科学基金项目(42267025);内蒙古自治区高等学校科学技术研究项目(NJZZ23089)。

摘　　要：地下水在蒸发排泄区所发生的一系列与碳有关的水-岩相互作用对陆地碳循环具有重要的影响。然而,目前关于在地下水蒸发排泄过程中溶解无机碳(DIC)的迁移转化的研究较少。本文以内蒙古呼和浩特盆地为例,应用质量守恒原理、水文地球化学模拟方法构建地下水蒸发排泄区碳平衡方程,分析地下水蒸发过程中DIC的迁移转化机制。结果表明,呼和浩特盆地蒸发排泄区属于“碳汇”,该区域向大气排碳速率为7.4g/(m^(2)·a),而以方解石沉淀和以DIC进入地下水中的固碳速率为37.1g/(m^(2)·a)。方解石的沉淀和白云石的溶解是控制地下水蒸发排泄区DIC迁移转化的主要水-岩相互作用。白云石和钙长石溶解过程释放的钙有效地促进了方解石的沉淀,是该区地下水成为碳汇的主要原因。The carbon-related water-rock interactions occurring in groundwater evaporation discharge areas have a significant impact on the terrestrial carbon cycle.However,there is limited research on the migration and transformation of dissolved inorganic carbon(DIC)during the groundwater evaporation discharge processes.This study,taking the Hohhot Basin in Inner Mongolia as an example,established a carbon balance equation in groundwater evaporation discharge areas using the principle of mass conservation and hydrogeochemical simulation methods.It aimed to analyze the mechanisms behind the DIC migration and transformation during groundwater evaporation.Results indicate that the evaporation discharge area in the Hohhot Basin acted as a"carbon sink",releasing carbon to the atmosphere at a rate of 7.4 g/(m^(2)·a),while the rates of carbon sequestration through calcite precipitation and DIC entering groundwater are 37.1 g/(m^(2)·a).The calcite precipitation and dolomite dissolution were the primary water-rock interactions controlling the DIC migration and transformation in the groundwater evaporation discharge area.The calcium released from the dolomite and plagioclase dissolution effectively promoted the calcite precipitation,significantly contributing to the groundwater becoming a carbon sink in this region.

关 键 词：地下水 碳循环 溶解无机碳(DIC) 水-岩相互作用 

分 类 号：X523[环境科学与工程—环境工程]