Figure 3

Determine the soil organic carbon density (SOCD, kg·m⁻²) and soil nutrient factor content under each sample, and correlate between soil organic carbon density (SOCD, kg·m⁻²) and soil factors (mg·kg⁻¹) (including Soil P, K, Ca, Mg, N, C/N, C/P, N/P, Bulk Density, pH, EC, TOC, TN, NH4⁺–N and NO3⁻–N) in the same space.