ACCUMULATION OF SOIL ORGANIC CARBON UNDER THE EFFECTS OF CLIMATE, SOIL PROPERTIES AND AGRICULTURAL PRACTICE

Abstract

Soil organic carbon accumulation affects soil health, atmospheric CO₂ absorption and carbon sequestration in soil. This study aims to evaluate the effects of climate conditions, soil types, soil texture and properties, agricultural practices, surface organic material and use types (acacia, rice, pomelo, grassland, bare land) on soil organic carbon (SOC). The study applied a multivariate linear regression model using SPSS to build a predictive model and appreciate the effects of the factors on SOC accumulation. The results indicated that four factors, including pH, total N, total K₂O and surface organic material, accounted for 85.4% of the SOC changes. Of which, surface organic material correlated the best with SOC reserves (R² = 0.74). For the less disturbed land use types, the correlations of pH and surface organic material with SOC contents were better than other factors. In contrast, total N and total K₂O had the best linear correlation with SOC contents in land use types with additional fertilizer application and tillage.