Effect of land uses of Huai Lam Kradon Sub-watershed on quantifying soil carbon potential with process base model

The study the effect of land use on soil carbon is importantly for the future management of greenhouse gases and climate change, and soil carbon budget is one activity mention of the United Nations Framework Convention on Climate Change (UNFCCC) for decreasing effect from climate change. Previous studies based on field observations have provided direct information about soil carbon storage and fluxes at specific sites, but soil carbon is highly dynamic in space and time and that is driven by complex combinations of hydrology, soil vegetation and management condition. The observation results was soil carbon higher in mixed deciduous forest 17,472.30 Kg C/ha than para rubber plantation 8,304.52 Kg C /ha at depth 0-5 cm and at depth 5-20 cm 8,304.52 Kg C /ha and 6,776.65, respectively. The DNDC model has shown that it can perform well in its representation of the effects of both land uses change in this study area. Simulation results showed significant loss of soil carbon from system under both land use types and eight scenarios of land use change from mixed deciduous forest to para rubber plantation and para rubber tree change to mixed deciduous forest. The annual 50 year soil carbon was 17,960 and 8,300 C /ha/yr for mixed deciduous forest and para rubber plantation, respectively. The simulated soil carbon under land uses change scenarios. The result for soil carbon content in three scenarios for mixed deciduous forest change to para rubber plantation scenarios. The soil carbon decrease in all scenarios and the mean decrease highest of litter carbon in MDF 10 Year to Para rubber 40 Year scenario was 8,770.42 C /ha/yr or 49.79% and mean lowest of soil carbon MDF 40 Year to Para rubber 10 Year scenario was 4,700.47 /ha/yr or 26.68 %. The result for soil carbon content in three scenarios for mixed deciduous forest change to para rubber plantation scenarios. The mean soil carbon and decrease highest of litter carbon in para rubber plantation 10 year change to mixed deciduous forest 40 year was 6931.22 C /ha/yr or 45.57% and mean lowest of soil carbon para rubber plantation 40 year change to mixed deciduous forest 10 year was 3452.57 C /ha/yr or 22.70%.