Abstract:

The purpose of the study was to research the changes of soil CO2 concentration after planting Castanea mollissima in the Karst areas, taking two kinds of lands as the research object, which were under Castanea mollissima and grassland in Karst areas of Long’an County, Guangxi, tests the pH values and CO2 concentration of the soils in corresponding depths which included 10 cm, 20 cm, 40 cm, 60 cm and 80 cm at the dry and rainy seasons; then conducts a comparison study on the soil’s CO2 concentration between them, with aim to study the change of the soil’s CO2 concentration after planting Castanea mollissima in Typical Karst area. The results showed that under the same condition, the soil’s pH value of Castanea mollissima was lower than others. Relate to rainy season and dry season, the soil pH value of rainy season was lower than dry season. Relate to the soil CO2 concentration, under the same condition, the soil CO2 concentration of Castanea mollissima was higher than others, and soil CO2 concentration of rainy season was higher than dry season. Based on the analysis of soil pH values and soil CO2 concentration, the soil CO2 concentration had significant negative correlation with soil pH. The soil CO2 concentration had significant correlation with rainfall, temperature etc.