热带地理Issue(5)：575-581,7.
土壤CO2、土壤水的动态特征及其对岩溶作用的驱动
Dynamic Characteristics of the Soil CO2 and Soil Water Chemistry, and Their Driving Action on Karstification
摘要
Abstract
In order to understand the occurrence degree of karstification under different soil CO2 concentration and soil water chemistry, the soil CO2 concentration, water content and erosion rate of limestone were monitored in the area of Guilin, Guangxi Province.The results showed that: 1) The soil CO2 concentration had seasonal variation obviously with a trend of that the highest in summer and the lowest in winter, the soil CO2 concentration in summer was 3~5 times as many as those in other seasons on the whole, the maximum was 60 899.64 mg/m2, while the minimum only 5 587.21 mg/m2;2) The CO2 concentration in the soil of depression was higher than that in the soil of slope at the layers of the same depth, the former was nearly 20 000 mg/m2 more than that of the latter in summer, and the concentration was higher at deep layer than that at surface, and the mean value was 4 353.54 mg/m2 more than the concentration at surface;3) The average values of soil water chemistry in the soil of slope and depression were as follows:pH 7.49 and 6.41, conductivity 300μS/cm and 78μS/cm, Ca2+60 mg/L and 15.43 mg/L, 3HCO 2.78 mg/L and 0.44 mg/L, respectively;the pH value, conductivity, Ca2+and 3HCO in soil water of slope were all higher than those of the depression;4) Corrosion test indicated that the Karstification was very obvious in the study area, and was closely related to soil CO2 and soil water. So it is concluded that the karstification was driven by soil CO2 and soil water.关键词
土壤CO2/土壤水/溶蚀量/岩溶作用Key words
soil CO2/soil water/erosion volume/karstification分类
天文与地球科学引用本文复制引用
李涛,赵东兴,张美良,曹建华,朱晓燕..土壤CO2、土壤水的动态特征及其对岩溶作用的驱动[J].热带地理,2013,(5):575-581,7.基金项目
国家自然科学基金项目--中国西南50-15万年来石笋记录的气候事件及全球意义（40772216）；中国地质调查项目--CO2同位素仪测定大气和洞穴空气中δ13C的季节性变化（2012006）；中国气候变化岩溶沉积物记录研究 （）
