Biomass And Carbon Density Of Five Plantation Ecosystem Types In Beijing

With the rapid development of the economy, the encironmental problem has become increasingly outstanding, greenhouse effect, which caused by a lot of fossil fuel combustion, has become a serious challenge for human. As main part of the terrestrial ecosystem, forests have very important position in the terrestrial ecosystem carbon cycle. Now on the study of forest ecosystem biomass and carbon density, there are still many uncertainties. Based on the results of forests sample plot investigation and sampling determination, vegetation layer biomass, litter layer contents, soil organic carbon content and their carbon density of Pinus tabuliformis, Acer truncatum plantations in Beijing rocky moutainous area and Poplar plantation, mixed Poplar and Pinus tabuliformi plantations, mixed Poplar and Black Locust plantations in Beijing plain area in different land density were studied, and also the influence of forest management (eg. stand density and tree species) to the biomass and carbon density of plantation ecosystem were evaluated, in order to reduce the uncertainty when estimate plantation ecosystem carbon sink in Beijing area, and provide suggestions and theory support to the scientific plantation management in Beijing area. Results showed that:(1) Total tree biomass of YS and YB in Beijing rocky moutainous area ranged from 137.00～ 240.33 t/hm2 and 110.47～146.49 t/hm2, respectively. Total tree biomass of YC, YSH and YHH in Beijing plain area ranged from 36.10～75.25 t/hm2,35.79～50.06 t/hm2 and 39.67～90.59 t/hm2, respectively.(2) Shrub biomass of YS and YB in Beijing rocky moutainous area ranged from 0.08～0.75 t/hm2 and 0.12～0.44 t/hm2, respectively. Herb biomass of YS and YB in Beijing rocky moutainous area ranged from 0.62～0.84 t/hm2 and 0.36～0.55 t/hm2, respectively. Shrub biomass of YC, YSH and YHH in Beijing plain area ranged from 0.00～1.04 t/hm2,0.00～2.18 t/hm2 and 0.00～3.81 t/hm2, respectively. Herb biomass of YC, YSH and YHH in Beijing plain area ranged from 0.21～0.68 t/hm2, 0.31～0.51 t/hm2 and 0.33～1.42 t/hm2, respectively.(3) The total vegetation carbon density of YS and YB in Beijing rocky moutainous area ranged from 68.97～120.52 t/hm2 and 55.57～73.65 t/hm2, respectively. The total vegetation carbon density of YC, YSH and YHH in Beijing plain area ranged from 18.39～38.29 t/hm2,18.45～26.27 t/hm2 and 20.09～45.24 t/hm2, respectively.(4) Litter contents of YS and YB in Beijing rocky moutainous area ranged from 65.35-37.21 t/hm2 and 10.52～15.44 t/hm2, respectively. Litter carbon density of YS and YB in Beijing rocky moutainous area ranged from 32.67～37.21 t/hm2 and 5.26～7.72 t/hm2, respectively. Litter contents of YC, YSH and YHH in Beijing plain area ranged from 1.04～4.81 t/hm2,3.95～5.49 t/hm2 and 4.20～ 5.21 t/hm2, respectively. Litter carbon density of YC, YSH and YHH in Beijing plain area ranged from 0.52～2.41 t/hm2,1.98～2.74 t/hm2 and 2.10～2.61 t/hm2, respectively.(5) SOC density of YS and YB in Beijing rocky moutainous area ranged from 136.32-173.49 t/hm2 and 181.77～209.32 t/hm2, respectively. SOC density of YC, YSH and YHH in and mixed Poplar and Black Locust plantation Beijing plain area ranged from 64.79～89.51 t/hm2,63.37～80.38 t/hm2 and 65.78～73.51 t/hm2, respectively.(6) The ecosystem total carbon density of YS and YB in Beijing rocky moutainous area ranged from 242.50～319.97 t/hm2 and 263.14～270.15 t/hm2, respectively. The ecosystem total carbon density of YC, YSH and YHH in Beijing plain area ranged from 86.85～121.51 t/hm2,88.85～104.46 t/hm2 and 93.14～113.38 t/hm2, respectively.