Study on response of carbonate rock dissolution rate to the season in Zhongliang Mountain, Chongqing

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.