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    赵一, 邹胜章, 申豪勇, 蓝芙宁, 谢浩, 李军. 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[J]. 中国地质. DOI: 10.12029/gc20221025002
    引用本文: 赵一, 邹胜章, 申豪勇, 蓝芙宁, 谢浩, 李军. 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[J]. 中国地质. DOI: 10.12029/gc20221025002
    ZHAO Yi, ZOU Shengzhang, SHEN Haoyong, LAN Funing, XIE Hao, LI Jun. Source and control factors of main ions and dissolved inorganic carbon in the lakes of Huixian Karst Wetland[J]. GEOLOGY IN CHINA. DOI: 10.12029/gc20221025002
    Citation: ZHAO Yi, ZOU Shengzhang, SHEN Haoyong, LAN Funing, XIE Hao, LI Jun. Source and control factors of main ions and dissolved inorganic carbon in the lakes of Huixian Karst Wetland[J]. GEOLOGY IN CHINA. DOI: 10.12029/gc20221025002

    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

    Source and control factors of main ions and dissolved inorganic carbon in the lakes of Huixian Karst Wetland

    • 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了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。

       

      Abstract: Objective In order to find out the sources and control factors of main ions and dissolved inorganic carbon(DIC) in karst wetland water. Method Groundwater and surface water samples were collected from Huixian karst wetland, and the characteristics of hydrochemistry and dissolved inorganic carbon isotope(δ13CDIC) were analyzed. Results The hydrochemical type of most groundwater and surface water of Huixian karst wetland is Ca-HCO3. Ca2+, Mg2+ and HCO3- are mainly from carbonate rock dissolution; NO3- mainly from agricultural fertilizer and nitrification of soil organic nitrogen; K+, Na+ and Cl- mainly from fertilizer, manure and sewage; SO42- mainly from acid rain and pyrite oxidation. DIC in wetland groundwater mainly comes from the dissolution of soil CO2 and carbonate minerals. According to the isotopic mass balance, the calculation results show that about 46% comes from soil CO2, and about 54% comes from the contribution of minerals themselves. Huixian Karst Wetland is not entirely the result of carbonate weathering under the participation of CO2. Sulfur-containing minerals, acid rain, and human activity derived H2SO4 also participate in the weathering of carbonate rocks as erosion media. In addition, the nitrification of agricultural input reduced nitrogen fertilizer cannot be ignored. Wetland surface water DIC mainly comes from groundwater. Wetland surface water δ13CDIC value is affected by photosynthesis of aquatic plants and CO2 degassing, and its composition is relatively positive compared with that of groundwater. Conclusion Water Chemistry and δ13CDIC can help understand the weathering and biogeochemical processes of karst wetlands, and it should also be combined with wetland hydrogeology and human activities to provide more accurate information.

       

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