吊丝单竹林生态系统碳储量及其垂直空间分配特征

利用标准样方法研究了吊丝单竹(Dendrocalamopsis vario-striata)林的碳储量及其空间分布特征。结果表明,吊丝单竹不同器官的碳密度为0.4684~0.5092 g g^-1,依次为竹秆>竹蔸>竹根>竹枝>竹叶;碳储量在吊丝单竹不同器官中的分配以竹秆最大(达50.46%),其次为竹蔸(20.71%),竹叶的最小(仅5.01%)。整个吊丝单竹林生态系统碳库主要由乔木层、灌草层、枯落物层和土壤层4部分组成,总碳贮量为104.9321 t hm^-2,其空间分布为土壤层>乔木层>枯落物层>灌草层,其中土壤层占总碳储量的比例最大(59.74%);整个吊丝单竹林乔木层年固碳量为6.4460 t hm^-2a^-1,相当于每年同化CO₂的量为23.6353 t hm^-2a^-1,这略低于我国森林植被的平均年固碳量,表明吊丝单竹林还有较大的发展空间。

Carbon Storage and Vertical Spatial Distribution of Dendrocalamopsis vario-striata Ecosystem

Carbon storage and spatial distribution characteristics of Dendrocalamopsis vario-striata were studied by using quadrat method.The results showed that carbon density in different organs of D. vario-striata ranged from 0.4684 to 0.5092 g g^-1, with in order as: culm>rhizome>root>branch>leaf. The organ distribution of carbon storage was 50.46% for culm, 20.71% for rhizome, 14.31% for root, 9.24% for branch and 5.01% for leaf. The total carbon pool, counting for 104.9321 t hm^-2, mainly consisted of four components, such as arbor layer, shrub and herb layer, litter layer and soil layer, which spatial distribution was in order as: soil layer (59.74%)>arbor layer (36.86%)> litter layer (2.30%)>shrub and herb layer (1.10%). Annual fixed carbon content of bamboo forest was 6.4460 t hm^-2, equivalent to 23.6353 t hm^-2 CO₂, which was lower than that of average value of forests in China. It suggested that there was much development space for fixed carbon capacity of D. vario-striata.