Estimate of soil organic carbon and greenhouse gas emissions in para rubber (Hevea brasiliensis Mull. Arg) plantation by DNDC model in Upland Area Northern, Thailand

The process-oriented model DNDC describing biogeochemical cycling of C and N and greenhouse gases (GHGs) fluxes carbon dioxide (CO2), nitrous oxide (N2O), nitric oxide (NO) in para rubber plantation was applied to simulate carbon sequestration and GHGs emissions in a para rubber plantation of small watershed in the lower part of northern Thailand. The results indicated that the simulated gross primary production (GPP) and soil organic carbon (SOC) of the para rubber plantation was strongly affected by temperature. The annual total GPP was 2,765.8 kg C /ha/yr, and net primary production (NPP) was 2,032.4. The SOC in 0-10 cm. were 4,983 kg C /ha/yr for 2011.The simulated seasonal variation in CO2 emissions generally followed the seasonal variations in temperature and precipitation. The annual total CO2 emission was 976.53 kg C /ha/yr for 2011, the simulated annual total N2O emissions from the plantation's soil was 10.51 kg N ha-1yr-1 for 2011, the annual total NO emissions were 0.87 kg N /ha/yr for 2011, and the annual Dissolved Organic Matter (DOM) leaching was 0.23 kg C /ha/yr