速生阶段杉木人工林碳素密度、贮量和分布

DENSITY, STORAGE AND DISTRIBUTION OF CARBON IN CHINESE FIR PLANTATION AT FAST GROWING STAGE

利用定位观测取得的数据 ,对速生阶段杉木人工林的碳素密度、贮量及其空间分布特征进行了研究。结果表明 :杉木不同器官中碳素密度变化范围在 0 4 5 5 8gC·g- 1 ～ 0 5 0 0 3gC·g- 1 之间 ,各器官碳素密度的排列顺序为 :树皮 >树叶 >树干 >树根 >球果 >树枝 ,多年生枝、叶的碳素密度比其他年龄的枝、叶要高 ;灌木层、草本层的碳素密度分别为 0 4 344gC·g- 1 、0 4 0 0 9gC·g- 1 ,死地被物层碳素密度为 0 4 341gC·g- 1 ,土壤中各层次碳素密度分布不均 ,表土层的碳素密度略低于亚表土层 ;碳贮量在杉木不同器官中的分配 ,基本与各器官的生物量成正比例关系 ,树干生物量占林分生物量的 4 7 7% ,其碳贮量占林分碳素贮量的 4 7 5 % ,枝、叶、皮、根等当中的碳贮量占 5 2 5 % ;在速生阶段杉木林生态系统中 ,碳库的总贮量为 12 7 88tC·hm- 2 ,其中植被层中碳总贮量为 35 883tC·hm- 2 ,土壤层 (包括死地被物层 )的碳总贮量为 91 997tC·hm- 2 ;速生阶段杉木林年净生产力为 7 35 1t·hm- 2 a- 1 ,有机碳年净固定量为 3 4 89tC·hm- 2 a- 1 。

Based on the data collected by located observation, the density, storage and spatial distribution of carbon were studied in Chinese fir plantation at fast growing stage. The results showed that carbon density in different organs of Chinese fir ranged from 0.4558?gC·g -1 to 0.5003?gC·g -1 ,and was in the order as: bark>leaf> trunk>root>cone >branch. The carbon density in the perennial branch and leaf was higher than that of the youngers'. Carbon density in shrub, herb and floor was 0.4344?gC·g -1 , 0.4009?gC·g -1 and 0.4341?gC·g -1 , respectively. Carbon density of the surface soil was a little lower than that of the second surface soil. Carbon storage in different organs was basically in direct proportion to the biomass of respective organ ,biomass of trunk made up 47 7% of the standing forest biomass, correspondingly its carbon storage amounted for 47 5% of the standing forest carbon storage , the rest in branch, leaf, bark and root, etc., seized 52 5%. The total carbon storage in Chinese fir plantation at fast growing stage was up to 127 88?tC·hm -2 ,including 35 883?tC·hm -2 in the plant, and 91 997?tC·hm -2 in the soil (including floor). The annual net productivity of Chinese fir plantation at fast growing stage was 7 351?t·hm -2 a -1 , stored carbon up to 3 489?tC·hm -2 a -1 . Forest was an important sink of atmospheric CO 2