川西退耕还林地苦竹林碳密度、碳贮量及其空间分布

Density, Storage and Spatial Distribution of Carbon in Pleioblastus amarus Forest Returned from Farmland

利用标准样方法研究了退耕还林地苦竹林碳素密度和碳贮量及其空间分布。结果表明：苦竹不同器官碳素密度波动在0．348498-0．51863gC^0／g，按碳素密度高低排列依次为竹秆〉竹蔸〉竹鞭〉竹枝〉竹根〉竹叶；枯落物碳素含量为0．341655gC^0／g，土壤碳素密度由上至下呈下降趋势。碳贮量在苦竹不同器官中的分配以竹秆所占比例最大，为53．06％，其次为竹叶，占13．83％，占比例最小的是竹根，仅占3.14％；苦竹林生态系统中碳总贮量为135．808110t／hm^2，其中乔木层为46．032420t／hm^2，占33．9％，林下及其枯落物层为2．60068t／hm^2，占1．91％。土壤层0-60cm总计为87．1750t／hm^2，占64．19％；退耕还林地苦竹林乔木层年固碳量约为8．142t／（hm^2·a）。

Study on density, storage and spatial distribution of carbon in Pleioblastus amarus forest returned from farmland by sample plot demonstrated that carbon density of different bamboo organs was ranged from 0.348 498 to 0.518 63 gC^0g^-1, ordered as follow： culm 〉 underground trunk 〉 rhizome 〉 branch 〉 root 〉 leaf. Carbon content in litter was 0.341655 g C^0g^-1, the carbon density in the soil declined with depth. Carbon distribution in organ was 53.06% of culm, 13.83% of leaf and 3.14% of root. The total carbon storage in P. amarus ecosystem was 135.808110 t/ha, of which 46.032 420 t/hm^2 in the aboveground arbor, about 33.9%, and 2.600 68t/hm^2 in the litter, about 1.91%, and 87.1750t/hm^2 in the soil layer （ 0 - 60 cm ） , accounted for 64.19%. Annual carbon fixation of tree story in P. amarus forest returned from farmland was 8.142 t/hm^2 a year.