Study on response of carbonate rock dissolution rate to the season in Zhongliang Mountain, Chongqing
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摘要: 在重庆市中梁山岩溶槽谷,选取林地、园地、耕地和菜地4种不同土地利用类型,通过野外下三叠统嘉陵江组白云质灰岩石试片的溶蚀试验分析不同土地利用方式下溶蚀速率对季节的响应关系。结果表明:不同土地利用方式将造成土壤性质发生不同的变化,进而对岩石的溶蚀速率产生明显的影响。但无论是从夏半年还是从全年来看,试片的溶蚀速率的大小变化均表现为:林地>菜地>耕地>园地。夏半年在全年的试片溶蚀作用过程中贡献较大,其绝对溶蚀量占全年比例都大于50%;除林地、菜地和园地土下50cm试片外,其余试片的夏半年溶蚀速率都大于全年溶蚀速率。究其原因,主要是由于夏半年气温高,降水量大,使土壤中CO2和水分等增加,从而有利于岩溶作用的进行Abstract: Taking the karst area of Zhongliang Mountain as a case study, response relation of dolomitic limestone solution rate under different land using tapes to the season is analyzed through solution rate test on Jialingjiang dolomitic limestone piece of lower Triassic System in the field. In the test, four different types of land use, wood land, orchard land, farmland and vegetable field are chosen. The results indicate that the soil properties are highly different with the change of land use types, which affect the dissolution rate obviously. Both in summer and the whole year, dissolution rates under different land use tapes are (from high to low) wood land, vegetable land, farmland and orchard land. The dissolution amount in summer accounts for more than 50% of that in the whole year. And the dissolution rate in summer is higher than the average rate in whole year, except that in the 50cm deep in the wood land, vegetable field and orchard land. The reason is that the CO2 and moisture increase in summer because of the high temperature and more rainfall, which are in favor of solution.
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