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岩溶地下河补给的地表溪流溶解无机碳及其稳定同位素组成的时空变化
摘要点击 1636  全文点击 661  投稿时间:2016-07-25  修订日期:2016-09-03
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中文关键词  岩溶地表溪流  溶解无机碳(DIC)  δ13CDIC  碳酸盐岩风化  广西
英文关键词  karst surface stream  dissolved inorganic carbon (DIC)  δ13CDIC  carbonate dissolution  Guangxi
作者单位E-mail
李丽 中国地质科学院岩溶地质研究所/国土资源部, 广西岩溶动力学重点实验室, 桂林 541004
西南大学地理科学学院, 重庆 400715 
894123302@qq.com 
蒲俊兵 中国地质科学院岩溶地质研究所/国土资源部, 广西岩溶动力学重点实验室, 桂林 541004  
李建鸿 中国地质科学院岩溶地质研究所/国土资源部, 广西岩溶动力学重点实验室, 桂林 541004 jianhongli1988@karst.ac.cn 
张陶 中国地质科学院岩溶地质研究所/国土资源部, 广西岩溶动力学重点实验室, 桂林 541004
西南大学地理科学学院, 重庆 400715 
 
中文摘要
      岩溶水体中溶解无机碳(DIC)主要以HCO3-形式存在,其同位素(δ13CDIC)被广泛用于示踪DIC的不同来源及其影响因素.为了解亚热带典型岩溶溪流溶解无机碳及其稳定同位素的分布规律,本文以广西柳州官村地下河补给的地表溪流为研究对象,对其水化学特征和δ13CDIC进行分析.结果表明,溪流上游和下游的DIC与δ13CDIC都表现出明显的时空变化特征,地下河出口(G1点)HCO3-旱季浓度变化范围为(4.73±0.14)mmol·L-1,而雨季为(4.23±0.68)mmol·L-1.溪流下游(G2点)HCO3-旱季浓度变化范围为(4.56±0.23)mmol·L-1,而雨季为(4.20±0.59)mmol·L-1.溪流上游的旱季δ13CDIC变化范围为-12.22‰±0.49‰,雨季的变化范围为-12.28‰±0.82‰;溪流下游的旱季变化范围为-10.73±0.71‰,雨季的变化范围为-11.10‰±0.90‰.两个点水体DIC含量旱季均高于雨季,且G1点要高于下游G2点.两个点水体δ13CDIC值旱季较雨季偏重,且G2点水体δ13CDIC值显著高于G1点δ13CDIC值.地下河水和溪流DIC主要来源于土壤CO2和碳酸盐岩溶蚀,但是溪流上游与下游DIC和δ13CDIC值差异表明水体的CO2脱气作用,水生植物的光合作用显著影响了水体DIC和δ13CDIC值.
英文摘要
      Stable carbon isotope of dissolved inorganic carbon (δ13CDIC), which is mainly constituted by HCO3- in karst water, is widely used to trace the different sources and influential factors of dissolved inorganic carbon (DIC). In order to understand the distribution of DIC and δ13CDIC in subtropical karst area, this paper researched the water chemistry and δ13CDIC in a karst surface stream in detail, which is fed by Guancun subterranean stream in Liuzhou City, Guangxi Province, in the southwest of China. The results showed that the contents of DIC in subterranean stream outlet (G1 site) ranged from 4.60 to 4.90 mmol·L-1 with an average of 4.73 mmol·L-1 in dry season, and from 2.80 to 4.70 mmol·L-1 with an average of 4.23 mmol·L-1 in rainy season. The contents of DIC in 1.35 km downstream site (G2 site) ranged from 4.30 to 4.90 mmol·L-1 with an average of 4.56 mmol·L-1 in dry season, and from 3.00 to 4.70 mmol·L-1 with an average of 4.20 mmol·L-1 in rainy season. The δ13CDIC of subterranean stream outlet (G1 site) varied from -12.8‰ to -11.53‰ with an average of -12.22‰ in dry season, and from -13.12‰ to -11.01‰ with an average of -12.28‰ in rainy season. The δ13CDIC of stream downstream site (G2 site) ranged from -11.71‰ to -9.55‰ with an average of -10.73‰ in dry season, and ranged from -12.18‰ to -9.85‰ with an average of -11.10‰ in rainy season. The contents of DIC of G1 site were higher than those of G2 site. The DIC contents in dry season in both G1 and G2 site were higher than those in rainy season. The values of δ13CDICof G1 and G2 site in dry season were more positive than those in rainy season. The δ13CDICvalue of G1 site was more negative than that of G2 site. The main sources of DIC in underground river and surface stream were soil CO2and carbonate dissolution. However, the differences of DIC and δ13CDICbetween G1 and G2 site showed that CO2degassing and photosynthesis of aquatic plants had significant influence on water DIC and δ13CDIC value. This study is helpful to understand the dynamic change and distribution of DIC and δ13CDIC in karst surface stream.

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