摘要
尽管大气中CO2浓度不断增加,但全球碳源与碳汇相抵后还存在遗失碳汇(missing sink)。一般认为遗失碳汇主要为地质碳汇。而碳酸盐岩的溶蚀作用可在短时间内产生大量的地质碳汇,与此同时,该过程也伴随着HCO3-、Ca2+、Mg2+等离子进入水中。由于水中的Ca2+、Mg2+比HCO3-稳定,故探讨Ca2+、Mg2+与HCO3-的关系,可以间接得到影响碳汇的各种主要因素。本文通过对岩溶区3种岩性5个监测点的Ca2+、Mg2+与HCO3-数据建立关系模型发现:(1)灰岩地区Ca2+可以与HCO3-建立良好的关系模型,相关性较好,而白云岩区Ca2+、Mg2+与HCO3-的相关关系比Ca2+与HCO3-的相关关系好;总之,在岩溶动力系统下,Ca2+、Mg2+全面考虑可更好指示碳汇的去向;(2)Ca2+、Mg2+与HCO3-的关系模型可以间接说明碳汇主要影响因子;由Ca2+、Mg2+与HCO3-的关系模型可得岩溶区地表明流段,水生生物的光合作用是碳汇主要影响因子,而地下河或泉水出口处,地质作用、CO2分压可能是碳汇的主要影响因子。得出碳汇主要影响因素,为潮田河流域碳汇研究区域划分以及准确计算地质碳汇提供依据与基础。
Although atmospheric CO2 concentration increases continuously,losing carbon(missing sink),which is called carbon sinks,exist beyond the carbon source and carbon sinks imbalance.Generally speaking,the missing carbon sinks are geological carbon sinks.Carbonate is dissolved and produced a considerable amount of carbon sinks(which is refers as to geological carbon sinks),with Ca2+,Mg2+ and HCO-3 coming into water in a short time.Because Ca2+ and Mg2+ are more instability than HCO-3,Ca2+ and Mg2+ can be obtained indirectly from carbon sinks under the influence factors.Five sampling points including 3 kinds of lithology are selected in this article and the results show that(1) Ca2+ and HCO-3 is found to have a good relation model to reflect carbon sinks orientation in limestone areas,and Ca2+ and Mg2+ are used as carbon sinks better in dolomite areas than in limestone areas.The considered Ca2+and Mg2+ are better than only Ca2+ in karst dynamic systems in karst area;(2) The relationship model between Ca2+,Mg2+ and HCO-3 can indicate which factors are the main element.According to the relationship model it can be know that the geological and CO2 pressure are the main factors in underground rivers or spring water discharge,and aquatic organism photosynthesis is the main factor in water flow.Identification of the carbon sinks influencing factors can provide a base on calculation of carbon sink.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2013年第4期106-111,共6页
Hydrogeology & Engineering Geology
基金
国家自然科学基金资助项目(40872213)
中国地质调查局工作项目(水[2011]矿评01-15-02)
关键词
岩溶
关系模型
地质碳汇
桂林潮田河
karst
relation model
geological carbon sinks
Chaotian River in Guilin
