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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。
In the Zhongliangshan karst trough in Chongqing, four types of land use such as forest land, garden land, farmland and vegetable land were selected to study the dissolution rate of dolomitic limestone samples from the Lower Triassic Jialingjiang Formation under different land use patterns Response to the season. The results show that different land use patterns will cause different changes of soil properties, which will have a significant impact on the rock erosion rate. However, no matter from the summer half year or from the whole year point of view, the changes of the dissolution rate of the specimen showed as follows: woodland> vegetable field> arable land> garden land. During the summer half of the year, there was a large contribution to the dissolution process of the test piece throughout the year, and the absolute erosion amount accounted for more than 50% of the total annual; in addition to the 50 cm test pieces of soil, woodland, Rate is greater than the annual rate of dissolution. The reason is mainly due to the high temperature and precipitation in the summer of the year, increasing the amount of CO2 and water in the soil, which is in favor of the karstification.