森林碳固定能力计算方法及长株潭区域碳年固定量估算

Computing model for carbon storage in forest ecosystem and the estimation of annual storage in area of Changsha Zhuzhou and Xiangtan

根据森林生态系统碳(CO2)平衡原理方程式[Fc=Nc(植物年净C)+Dc(凋落物C)+Mc(微生物C)+Ec(土壤动物及其它有机物C)-Rs(土壤放出C)],建立了森林生态系统碳(CO2)年固定量计算式:Fc=∑m∑nBEFcij·Xcij·11λi·Mkij·113-0.6Rij·Sij式中:Xcij———森林植物年净生产量;3+113Dcij+∑Hk=1j=1i=1Dcij———凋落物碳(CO2)固定量;Mkij———微生物自身碳素量;Rij———土壤呼吸放出CO2量;Sij———面积;i———森林类型序号;j———地域或土类序号。求算出长株潭地区森林生态系统年CO2固定量为3945.3×104t,是长株潭三市2000年工业燃料燃烧排放CO2总量的2.38倍。森林生态系统碳(CO2)固定能力,变幅在6.784～54.163t/(hm2·a-1)之间,大小排序为毛竹林>国外松林>阔叶林>四旁林>柏木林>马尾松林>杉木林>灌丛疏林>经济林。

In terms of the balance theory of carbon dioxide in the forest ecosystem, and based on the equation of Fc=Nc(annual plant carbon)+Dc(defoliation carbon)+Mc(microorganism carbon)+Ec(other zoological and organic carbon)-Rs(carbon releasfrom soil),amodel, Fc=∑mj=1∑ni=1BEF_(cij)·X_(cij)·113+113D_(cij)+∑Hk=1λ_i·M_(kij)·113-0.6?R_(ij)·S_(ij).Of the model, X_(cij)=the annual net production of forest plants;D_(cjj)=carbon dioxide stored in defoliation;M_(kij)=carbon content of microorganism; R_(ij)=carbon dioxide release from soil; S_(ij)=area; i=serial number of forest type, j=serial number of soil type or regional. Based on previous research data, parameters were identified, and the amount of CO_2 annually storied in the forest ecosystem within the three cities, Changsha, Zhuzhou and Xiangtan was up to (3?946.4)×10~4?t, which was 2.38 times of the total carbon dioxide released from fuel burning in industries within the three cities in year 2000. The data showed that the forest ecosystem is great pool of CO_2 storage . Also there were great differences of CO_2 storage capacity in different types of forest, which range from 6.784?t?/hm^2.a to 54.163?t?/hm^2.a. And ranked from large capacity to small, forests sort order was: bamboo forest >slash pine forest>broadleaved forest>rounding trees>cypress forest> massion pine> Chinese fir>open and shrub forest>economic forest. Among of the total CO_2 stored in different forest ecosystems, microorganisms of soil stored 25.98?% to 70.61?%, while in economic forest microorganisms stored 135.68?%.