Carbon Dynamics Of Forest Ecosystems In Jiangxi:CBM-CFS3 Model Simulation

Forest ecosystem has the largest carbon pool in the terrestrial ecosystem, which directly contributes carbon to global carbon cycling. Carbon Budget Model of the Canadian Forest Sector(CBM-CFS3) was driven by growth and yields, which was defined by the age and volume relationship. This model was used to simulate forest carbon stocks and their changes in Jiangxi major forest ecosystems. Furthermore, I also explored the forest fires carbon emissions by using 2005-2014 fire events data, which were obtained from Jiangxi annual statistical report from 2005 to 2014 of Jiangxi. The main conclusions are as follows:(1) Age-volume growth modelsA total of 245 growth curves was generated by fitting the forest inventory data through Richards model. The growth curves were defined by leading species and soil fertility within each region. The forest region was adopted China classification scheme.The goodness of fit coefficients, R2, was as follows: from 0.52~0.91 in the Northeast;0.587~0.93 in the south; 0.56~0.97 in Boyang region, 0.55~0.97 in the northwest,0.56~0.96 in the mid-east, and 0.55~0.93 in the mid-west. Quality control and assurance procedures were also performed to ensure the quality of the growth-yield information produced by the approximation.(2) Carbon stocks of JiangxiThe six region's total biomass stocks were: 54.33 Tg C in GDB, 159.49 Tg C in GN,GPY was 55.74 Tg C in GPY, 68.02 Tg C in GXB, 51.19 Tg C in GZD, and 104.77 Tg C in GZX. The 6 division of Jiangxi forest biomass carbon density respectively: GDB was47.57 t. hm-2, GN was 61.94 t. hm-2, GPY was 51.84 t. Hm- 2, GXB was 55.68 t. hm-2,GZD was 64.24 t. hm-2, GZX was 75.26 t · hm- 2.the provincial forest biomass carbon density of 60.17 t · hm-2The 6 partition forest of Jiangxi DOM carbon stocks reserves are: 258.32 Tg C in GDB, 611.63 Tg C in GN, 224.88 Tg C in GPY, 278.91 Tg C in GXB, 185.75 Tg C in GZD,347.62 Tg C in GZX;The 6 division of Jiangxi forest DOM carbon density respectively:GDB was 226.18 t. hm-2, GN was 237.53 t. hm-2, GPY was 209.17 t. hm- 2,GXB was 228.31 t. hm-2, GZD was 233.13 t. hm-2, GZX was 249.70 t · hm- 2. jiangxi province, the total DOM carbon carbon density of 232.50 t · hm- 2.(3) Carbon emissions caused by the fireWith CBM- CFS3 model to estimate the jiangxi province from 2005 to 2014 fire cause of carbon emissions.Results show that in these 10 years, the province's total carbon gas emissions to 418 790.15 tg C, quantity of CO2 emissions of 383 953.24 tg C,accounted for 92.0% of total emissions.CO emissions quantity of 31 354.71 tg C,accounting for 7.0% of the total emissions;CH4 emissions amount to 3 484.04 tg C,accounted for 1.0% of total emissions..