樟树人工林生态系统碳素贮量与分布研究

Carbon storage and distribution in Cinnamomum camphor plantation

对 1 8年生樟树人工林生物量、碳素含量、贮量及其空间分布进行测定。结果表明 ,樟树各器官的碳素含量为 4 2 1 2 %～ 5 5 4 2 % ,排列顺序为树叶 >树枝 >树根 >树干 >树皮。林冠上层与下层叶的碳素含量比中层叶的碳素含量低 ,但差别不大 ;下层枝条碳素含量明显比上、中层枝条高。灌木层植物的碳素含量平均为 5 1 30 % ,草本植物为 4 8 90 % ,死地被物层为4 0 89%。土壤的碳素含量为 1 2 5 % ,随土层深度的增加 ,各层次土壤碳素含量逐渐减少。樟树林生态系统总的碳贮量为 2 0 0 4 4× 1 0 3 kgC·hm-2 ,其中乔木层为 4 5 0 1× 1 0 3 kgC·hm-2 ,占整个生态系统总贮量的 2 2 4 5 % ,灌木层为 2 2 9× 1 0 3 kgC·hm-2 ,占 1 1 4 % ,草本层为 1 0 9×1 0 3 kg·C·hm-2 ,占 0 5 5 % ,死地被物层为 5 0 8× 1 0 3 kg·C·hm-2 ,占 2 5 4 % ,林地土壤 (0～ 1m)的碳贮量为 1 4 6 97× 1 0 3 kg·C·hm-2 ,占 73 32 %。樟树各器官的碳素贮量与其生物量成正比例关系 ,树干的生物量最大 ,其碳贮量也最高 ,占乔木层碳贮量的 4 0 0 6 %。樟树碳贮量的垂直分布随高度的增加而减少 ,在 8～ 1 0m区段出现明显增加的现象。樟树林年净生产力为9 5 5× 1 0 3 kg·hm-2 ·a-1 ,碳的年净固定量为 4

The biomass,carbon content,storage and distribution in Cinnamomum camphora plantation were studeied.The results showed that carbon content in different organs of C.camphora trees ranged from 42.12% to 55.42%,and decreased in the order of leaf > branch > root > bole > bark.In the canopy,the carbon content varied with layers.Carbon content in the leaves of upper and lower layer was lower than that in the leaves of the middle,and carbon content in the branch of the lowelayer was higher than that of the middle and the upper.The carbon content in shrub,herb and litter floor were 51.30%,48.90% and 40.89%,respectively.Carbon content in the soil was 1.25% and declined with soil depth.The total carbon storage in C.camphora plantation ecosystem amounted to 200 44×10 3 kg·C·hm -2 ,of which overstorey of camphor trees stored 45 01×10 3 kg·C·hm -2 and accounted for 22 45%,and soil within the depth from 0 to 1?m stored 146 97×10 3 kg·C·hm -2 and accounted for 73.32%.The carbon storage in different organs was positively related to the biomass of corresponding organs.Stem accumulated the highest carbon storage and comprised 40.06% of carbon storage in overstorey trees.Carbon storage decreased with the increase of height.However,carbon storage of C.camphora trees increased at the height from 8 to 10m.The annual net productivity of camphor trees was 9 55?t·hm -2 ·yr -1 and annual carbon storage was up to 4 89×10 3 kg·C·hm -2 ·yr -1 .