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花溪河水溶解无机碳同位素的季节变化
引用本文:闫慧,李中轩,陈杰.花溪河水溶解无机碳同位素的季节变化[J].地球与环境,2011,39(3):300-304.
作者姓名:闫慧  李中轩  陈杰
作者单位:许昌学院城市与环境学院,河南许昌,461000
基金项目:国家自然科学基金资助项目(基金号:40403010); 许昌学院校级项目(2011A004)
摘    要:对乌江上游支流花溪河水进行了一年的监测,测定了DIC含量和δ13 CDIC。结果显示DIC含量在1.73~4.53mmol/L之间,δ13 CDIC的变化范围-9.6‰~-3.6‰,反映了碳酸盐岩的主要控制作用,δ13 CDIC和DIC含量之间存在负相关关系,表明有机质分解作用、生物作用对河水DIC也有着重要影响。冬季...

关 键 词:溶解无机碳  碳同位素  有机质降解  花溪

Seasonal Variations in Dissolved Inorganic Carbon and δ13C of the Huaxi River
YAN Hui,LI Zhong-xuan,CHEN Jie.Seasonal Variations in Dissolved Inorganic Carbon and δ13C of the Huaxi River[J].Earth and Environment,2011,39(3):300-304.
Authors:YAN Hui  LI Zhong-xuan  CHEN Jie
Institution:YAN Hui,LI Zhong-xuan,CHEN Jie(College of Urban Planning and Environment Science,Xuchang University,Xuchang 461000,China)
Abstract:The Huaxi River,one of the tributaries of the Wujiang River,had been monitored for one year to determine the DIC concentrations and δ13CDIC.The results showed that DIC ranges from 1.73 to 4.53 mmol/L,and δ13CDIC varies from-9.6 ‰ to-3.6 ‰,reflecting the main control of carbonates,negative correlation between δ13CDIC and DIC indicated that the decomposition of organic matter and biological activities of the river also have an important influence on the DIC pool.Groundwater recharge and the dissolution of atmospheric CO2 in the winter led to higher δ13CDIC and DIC concentrations.With the onset of spring,enhancement of photosynthesis would cause an increase in δ13CDIC,a decrease in DIC concentrations,and the highest δ13CDIC value.During the summer,the decomposition of organic matter is a predominant control on shifts in the DIC pool,δ13CDIC reaches the lowest value,and due to the dilution effect of rainfall makes the DIC concentrations at the lower level.During the late summer,photosynthesis and elevated CO2 escape would cause an increase in δ13CDIC and a decrease in DIC concentrations.Decomposition of organic matter in the autumn would lead to a negative shift of δ13CDIC,accompanied by an increase in DIC concentrations.
Keywords:dissolved inorganic carbon  carbon isotope  decomposition of organic matter  Huaxi River  
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