广西会仙岩溶湿地水体主要离子和溶解无机碳来源及控制因素

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中文摘要：[研究目的]为查明会仙岩溶湿地水体主要离子和溶解无机碳(DIC)的来源及控制因素.[研究方法]于会仙岩溶湿地采集地下水和地表水样品,分析了水化学和溶解无机碳同位素(δ13CDIC)参数特征.[研究结果]会仙岩溶湿地大部分的地下水和地表水水化学类型为Ca-HCO3.湿地水体Ca2+、Mg2+与HCO3-主要来源于碳酸盐岩溶蚀;NO3-主要来源为农业化肥和土壤有机氮的硝化;K+、Na+和Cl-主要来源为化肥、粪肥和污水等;SO42-主要来源为酸雨和硫铁矿的氧化.湿地地下水中DIC主要来源于土壤CO2 和碳酸盐岩矿物的溶解,据同位素质量平衡,计算结果显示约 46%来自于土壤CO2,约 54%来源于矿物本身的贡献.会仙岩溶湿地不完全是CO2 参与下碳酸盐岩风化的结果,含硫矿物、酸雨和人类活动来源的H2SO4 作为侵蚀介质也参与碳酸盐岩的风化,此外,农业输入还原态氮肥的硝化作用不容忽视.湿地地表水中DIC主要来源于地下水,湿地地表水中δ13CDIC值受水生植物的光合作用和CO2 脱气的影响,组成较地下水相对富集偏正.[结论]水化学和δ13CDIC可以帮助理解岩溶湿地的风化和生物地球化学过程,同时还应结合湿地水文地质和人为活动等条件才能提供更准确的信息.

外文标题：Sources and control factors of main ions and dissolved inorganic carbon in karst water of the Huixian karst wetland,Guangxi

外文摘要：This paper is the result of hydrogeological survey engineering.[Objective]In order to determine the sources and control factors of main ions and dissolved inorganic carbon(DIC)in water of the Huixian karst wetland,[Methods]groundwater and surface water samples were collected from the Huixian karst wetland to analyze the hydrochemical ions and dissolved inorganic carbon isotope(δ13CDIC).[Results]The Ca-HCO3 water was identified as a main hydrochemical type in most water samples of the Huixian karst wetland.The dissolution of carbonate rock was primary contributor to Ca2+,Mg2+and HCO3-,while NO3-was mainly derived from synthetic fertilizers and soil organic nitrogen.Moreover,K+,Na+,and Cl-were driven by the mixed inputs of synthetic fertilizer,manure,and sewage,and the acid rain and pyrite oxidation contributed more to karst water SO42-.Further,karst water DIC was respectively derived from the soil CO2 with the contribution rate of 46％ and from the carbonate minerals with the contribution rate of 54％ according to the obtained result from isotopic mass balance.In addition to the H2CO3 produced from CO2 and H2O,the H2SO4 derived from sulfur-containing minerals,acid rain,and anthropogenic emissions was involved in carbonate weathering in the Huixian karst wetland.Additionally,microbial nitrification processes of the reduced nitrogen fertilizers could be also ignored in the study area.For the surface water,the DIC was mainly derived from groundwater recharges,and the value of δ13CDIC was affected by the photosynthesis of aquatic plants and CO2 degassing,thereby resulting in the more enrichment of δ13CDIC compared with that in groundwater.[Conclusions]The obtained results provided insights into the understanding of minerals weathering and biogeochemical processes,and also highlighted the control factors of hydrogeological conditions and human activities in precisely determining hydrochemical mechanisms in the karst wetland.

外文关键词：

karst wetlandhydrochemistrydissolved inorganic carbon isotopesourcecontrol factorshydrogeological survey engineeringGuilin CityGuangxi

作者：

赵一、邹胜章、申豪勇、蓝芙宁、谢浩、李军

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作者单位：

中国地质科学院岩溶地质研究所、广西岩溶资源环境工程技术研究中心/联合国教科文组织国际岩溶研究中心,广西桂林 541004

广西平果喀斯特生态系统国家野外科学观测研究站,广西平果 531406

西开普大学地球科学系,南非开普敦7535

河北建筑工程学院市政与环境工程系,河北省水质工程与水资源综合利用重点实验室,河北张家口 075000

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关键词：

岩溶湿地水化学溶解无机碳同位素来源控制因素水文地质调查工程桂林市广西

基金：

广西自然科学基金广西自然科学基金中国地质调查局项目中国地质调查局项目中国地质调查局项目

项目编号：

2021JJA1500412023JJD150024DD20230425DD20230081DD20221758

出版年：

2024

DOI：

10.12029/gc20221025002

中国地质

中国地质调查局

中国地质

CSTPCD北大核心

影响因子：2.317

ISSN：1000-3657

年,卷(期)：2024.51(5)

参考文献量31