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对杉木林生物量和净生产力、碳含量进行了动态观测 ,对杉木林生态系统碳收支平衡公式进行了探讨与推算 .结果表明 :杉木不同器官中碳含量排列顺序为树皮 >树叶 >树干 >树根 >球果 >树枝 ;不同年龄枝、叶碳含量以多年生枝、叶较高 ,11年生的杉木各器官碳含量略高于 10年生的 ;同一林分中各层次的碳含量高低顺序为乔木层 >灌木层 >草本层 ;死地被物层碳含量为 43.40 % ,土壤各层次的碳含量随着土壤层次加深而减少 ;7年生至 11年生的杉木林生态系统的碳库总量为 10 6.0 1～ 14 4.2 2 t· hm- 2 ,其中植被层为 15 .37～ 35 .0 9t· hm- 2 ,凋落物层为 0 .31～ 2 .5 8t· hm- 2 ,土壤层为 88.0 6～ 10 7.73t· hm- 2 ;10年生至 11年生杉木林植被层 CO2 同化年净增量为 19.0 5～ 18.0 8t· hm- 2 ,凋落物层为 1.12～ 4.2 2 t· hm- 2 ;随着林龄的增长 ,系统 CO2 的平衡值由负值变为正值 ,杉木林生态系统 10年生以前主要向大气释放 CO2 ,10年生后则吸收固定 CO2 ,这时才具有 CO2 汇的功能 .
The biomass, net productivity and carbon content of Cunninghamia lanceolata forest were observed and the carbon balance equation of Cunninghamia lanceolata forest ecosystem was explored and calculated. The results showed that the order of carbon content in different organs of Chinese fir was bark> leaves> > Tree roots> cones> branches; carbon content of branches and leaves of different ages was higher than that of perennial branches and leaves, and the carbon content of organs of 11-year-old Chinese fir was slightly higher than that of 10-year-old; The results showed that the carbon content of dead layer was 43.40%, and the carbon content of soil layer decreased with the deepening of soil layer. The total carbon pool of Chinese fir forest ecosystem from 7th-11th year to 11th year was 10 6.0 1 ~ 14 4.2 2 t · hm -2, in which the vegetation layer was 15.37 ~ 35.09t · hm -2, the litter layer was 0.31-2.58 t · hm -2, the soil layer was 88.0 6-10.73 t · hm-2. The net CO2 assimilation years of the 10-year-old and 11-year-old Chinese fir plantations were 19.0 5-18.0 8 t · hm -2 and the litter layer was 1.12-4.2 2 t · hm -2 ; With the increase of forest age, the equilibrium value of the system CO2 changed from negative to positive, and the Chinese fir forest ecosystem 10 The main raw CO2 released into the atmosphere before the absorption of CO2 fixation after 10 years old, then only with CO2 sink function.