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本文探讨了灞河流域岩溶特征、ＣＯ２估算方法和ＣＯ２吸收量。观测资料表明，灞河流 域河水中ｐＨ值在冬春季高，夏秋季低，而ＨＣＯ３含量通常与ｐＨ相反。河水和黄土地下水中 ｐＨ值、ＨＣＯ３等化学成分含量与北方南部石灰岩区岩溶水基本相同，表明该区现代岩溶作用 明显，黄土地层也在不断吸收ＣＯ２，并对全球碳循环有重要影响。雨水富含ＣＯ２，其中约有 ８２％的ＣＯ２被岩溶过程吸收，１８％左右的随河水流失。根据一个流域ＣＯ２输入量和输出量，可 以计算岩溶过程中 ＣＯ２吸收量。计算表明，灞河流域现代岩溶过程中每年吸收的 ＣＯ２约为５６３２．８ｔ。
This article explored the karst features, CO2 estimation method and CO2 absorption in Bahe River Basin. Observational data show that the pH value in the Bahe River watershed is high in winter and spring, low in summer and autumn, and the content of HCO3 is usually opposite to pH. The chemical composition of pH value and HCO3 in groundwater of loess and loess is basically the same as that of karst water in the northern limestone area, indicating that the karstification of the area is obvious. Loess strata are also constantly absorbing CO2 and have a significant impact on the global carbon cycle. Rainwater is rich in CO2, of which about 82% of the CO2 is absorbed by the karst process and about 18% is lost with the river. Based on the CO2 input and output of a river basin, CO2 absorption during karstification can be calculated. Calculations show that the annual CO2 absorption in the karst river basin is about 5632.8t.