Rock Dissolution Rate and Soil Properties of Karst Soil under Different Land Use Ways

PurposeTo study the rock dissolution rate and its main influencing factors under different land uses.

Method The quantitatively study on rock dissolution rate and its main soil properties under different land uses were conducted based on field sampling, laboratory measurement and geostatistical analysis. The main environmental factors affecting the rock dissolution rate were analyzed by using the canonical analysis method.

ResultThe range of dissolution rate under different land use patterns was 85.14-195.59 mg/(m²·d). The rock dissolution rate of different land uses followed the order: natural forest land>natural grassland>artificial grassland>natural shrub land>artificial forest land; the rock dissolution under natural land use patterns was stronger than that under artificial intervention, and the rock dissolution rate of forest land was better than that of grassland in terms of land use patterns. The dissolution rate had a extremely significant positive correlation with soil bulk density (P<0.01), with a correlation coefficient of 0.664; it had a extremely significant negative correlation with soil porosity and soil water content (P<0.01), with a correlation coefficient of −0.711 and −0.521, respectively. Each factor was related to each other and restricted each other, which jointly affected the dissolution intensity.

ConclusionHuman activities can promote rock dissolution rate, and the effect of planting grass is better than that of planting forest.