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为了深入研究岩溶泉水水化学性质与溶解无机碳同位素(δ13CDIC)的变化特征及其影响因素,在雨季(2014年6月~2014年10月)对柏树湾泉、兰花沟泉、后沟泉进行监测,并与旱季进行对比分析.结果表明,3个岩溶泉在雨季的碳酸盐岩溶蚀量大于旱季,但消耗的CO2量却小于旱季,其中兰花沟泉和后沟泉的CO2消耗量为负值.相对于雨季其它月份,7月与旱季一样,岩溶作用减弱但消耗的CO2量增加.因为受到水动力条件影响,7月H2CO3对碳酸盐岩溶蚀的贡献增加,而HNO3与H2SO4对碳酸盐岩溶蚀的贡献则降低.另外,HNO3与H2SO4溶蚀碳酸盐岩及其对HCO-3产生的脱水作用都会导致δ13CDIC偏正,因此δ13CDIC与NO-3+SO2-4浓度呈现出正相关性,而与HCO-3浓度呈现出负相关性.这说明水动力条件以及HNO3与H2SO4的参与对岩溶泉水化学性质及δ13CDIC的变化具有重要影响.
In order to further study the variation characteristics of water chemistry and dissolved inorganic carbon isotope (δ13CDIC) in karst springs and their influencing factors, The results showed that the carbonate karst dissolution rate of three karst springs in the rainy season was greater than that in the dry season, but the CO2 consumption was less than that in the dry season, and the CO2 consumption in the Langhuagou and Hougou springs was Negative.Compared with other months in the rainy season, like July, the karstification decreased but the amount of CO2 consumed increased due to the hydrodynamic conditions in July, while the contribution of H2CO3 to carbonate dissolution increased in July, while the correlation between HNO3 and H2SO4 While the contribution of carbonate dissolution to carbonate dissolution decreases. In addition, δ13CDIC is positively offset by HNO3 and H2SO4 dissolution of carbonate rocks and their dehydration effect on HCO-3, so δ13CDIC and NO-3 + SO2-4 concentrations are positive But negatively correlated with the concentration of HCO-3, indicating that hydrodynamic conditions and the involvement of HNO3 and H2SO4 have an important influence on the chemical properties of karst springs and the variation of δ13CDIC.