福建省典型生长区毛竹林生态系统碳密度研究

Carbon Density of Phyllostachys edulis Plantation Ecosystem in Typical Growth Area of Fujian Province

以福建省永安市、建阳市为代表性研究区，在野外调查估算毛竹林生态系统生物量的基础上，研究毛竹林生态系统的碳密度空间分布特征。结果表明：毛竹林生态系统碳密度为164.750 t/hm2，其空间分布为土壤层＞乔木层＞凋落物层＞灌草层，其中土壤层碳密度占总碳密度的比例最大（75.6％），凋落物层和土壤层的总碳密度是地上部分（乔木层和灌草层）的3.18倍；毛竹林乔木层各器官按碳密度大小排序为竹秆＞鞭根＞竹枝＞竹蔸＞竹叶；毛竹林土壤有机碳含量和碳密度均表现为随着土层深度的增加而逐渐降低，0～40 cm土层的有机碳密度占整个土壤层碳密度的75.33％；就毛竹林生态系统整体而言，其碳密度小于我国生态系统的平均碳密度，其碳汇能力还有较大的发展空间。

Taking Yong’an and Jianyang municipalities in Fujian Province as the typical research areas,the carbon density and its spatial distribution characteristics of Phyllostachys edulis plantation ecosystem were studied by estimating the biomass of P.edulis ecosystem through the field investigation.The results showed that the carbon density of P.edulis plantation ecosystem was 164.750 t/hm2 and its spatial distribution was in the order as soil layer〉orbor layer 〉litter layer 〉shrub and herb layer.Among the four layers,the soil layer had the highest car-bon density which accounted for 75.76%of the total carbon density.The total carbon density of the litter layer and the soil layer was 3.18 times that of the aboveground （arbor layer,shrub layer and herb layer）.The distribution of carbon density among the organs of P.edulis was ranked in the order of trunk 〉root 〉branches 〉underground trunk 〉leaves.Both of the organic carbon content and carbon density in the P.edulis plantation soil decreased with the soil depth.The carbon density in the 0-40 cm soil layer accounted for 75.33%of the total soil profile.In terms of P.edulis ecosystem as a whole,its carbon density was less than the average carbon density of different ecosystems in China,which suggested that there was much development space for carbon fixation capacity of P.edulis plantations.