【摘要】 对杉木二代林碳贮量和碳素年净固定量的动态特征进行了研究。结果表明,8、11和14年生杉木二代林生态系统碳贮量分别为136.24、147.59和161.83t·hm-2,其分布序列为土壤层(0～60cm)>植被层>凋落物层。随着林分林龄的增加,乔木层碳积累量明显增加,由8年生的17.09t·hm-2增加到14年生的37.29t·hm-2,分别占生态系统碳贮量的12.54%和23.04%。碳贮量在林木各器官中的分配,基本上与各自生物量成正比,其中树干碳贮量占乔木层碳贮量的46.05%以上,并随林木生长而明显增加。3种杉木林林地土壤层(0～60cm)碳贮量分别为117.60、119.26和122.06t·hm-2,占生态系统总碳贮量的75.42%以上,其中表层土壤(0～20cm)分别占土壤总碳贮量的56.45%、54.29%和57.37%。3种林分的年净生产力分别为5.49、6.18和7.62t·hm-2·a-1,碳素年净固定量分别为2.62、3.04和3.74t·hm-2·a-1。更多还原

【Abstract】 An experiment was conducted to study the dynamic change of carbon storage and annual net carbon fixation in the second rotation Chinese fir plantations. Results showed that the total carbon storage values in the 8-year-old,14-year-old,and 28-year-old second rotation Chinese fir plantation ecosystems were 136.24,147.59 and 161.83t·hm-2,respectively. The carbon storage in soil layer (0~60cm) was the highest,and then followed by vegetation layer and litter layer in order. The carbon storage of tree layer increased with stand age,the carbon storage of the trees increased from 17.09t·hm-2 at the 8-year-old to 37.29t·hm-2 at the 14-year-old,taking up 12.54 percent and 23.04 percent of the total carbon stock of the whole ecosystem,respectively. The carbon storage in different organs was positively related to the biomass of corresponding organs. Carbon storage of the stem occupied the greatest proportion of that of the tree (46.05 percent),and increased with stand age. Carbon storages in soil layer (0~60cm) of the second rotation Chinese fir plantations at 8-,14-,28-year-old were 117.60,119.26 and 122.06t·hm-2,accounting for more than 75.42 percent of the total,and carbon storages of the surface soil (0~20cm) layer at 8-,14-,28-year-old held 56.45 percent,54.29 percent and 57.37 percent of that in the soil layer,respectively. Annual net primary productivity values at 8-,14-,28-year-old were 5.49,6.18 and 7.62t·hm-2·a-1,and the values of annual net carbon fixation were 2.62,3.04 and 3.74t·hm-2·a-1,respectively.更多还原