Simulation Analyses of Terrestrial Carbon Cycle Balance Model in Northeast China

We have estimated vegetation carbon and soil organic carbon based on the fourth national forest inventory with 121 plots and second national soil survey with 388 soil profiles. Our estimate indicates that the amount of vegetation and soil organic carbon for Northeast China are 2.81×10 15 gC and 26.43×10 15 gC respectively, and that the densities of vegetation and soil organic carbon are 2.27 kgC/m 2 and 21.27 kgC/m 2 respectively. The eastern and northern parts of the region have much higher carbon storage than the rest of the region. Meanwhile, based on climate material, the simplified Terrestrial Carbon Cycle Balance (TCCB) model was established,which is semi mechanism and semi statistics. Through the TCCB model, this paper calculated the litter carbon pool, NPP, carbon fluxes and described the spatial characters of carbon pools and fluxes in Northeast China. Based on the TCCB model simulation, under current climate conditions, NPP in Northeast China is 5.16×10 8 tC/a, vegetation litterfall rate is 5.16×10 8 tC/a, litter mineralization rate is 3.61×10 8 tC/a, soil organic inputting rate is 1.55×10 8 tC/a, the litter carbon pool is 4.67×10 8 tC, and the soil decomposition rate is 1.55×10 8 tC/a. The carbon budget was also analyzed based on the estimates of carbon pools and fluxes. The spatial distribution of carbon pools and carbon fluxes in different compartments of terrestrial ecosystem was depicted with map respectively in Northeast China.