秃杉林和连栽杉木林生态系统C积累及其分布格局

Accumulation and distribution pattern of carbon in ecosystems of Taiwania flousiana and successive rotations of Cunninghamia lanceolata plantations

通过野外调查和室内分析,对广西南丹县山口林场23年生秃杉林和连栽杉木林C储量及其分布特征进行了研究。结果表明:秃杉各器官中C含量为426.0~503.9 g·kg^(-1),不同器官C含量排序为:皮>干>根>枝>叶,草本层、灌木层和凋落物层平均C含量分别为452.7、408.0和428.9 g·kg^(-1),土壤(0~80 cm)C含量为16.59 g·kg^(-1)。杉木各器官中C含量为464.5~508.9 g·kg^(-1),不同器官C含量排序为:皮>干>枝>根>叶,草本层、灌木层和凋落物层平均C含量分别为456.2、416.3和468.1 g·kg^(-1),土壤(0~80 cm)C含量为15.77 g·kg^(-1)。秃杉林和连栽杉木林生态系统C储量分别为245.82、213.52 t·hm^(-2),不同层次C储量排序为:土壤层>乔木层>凋落物层或灌草层。秃杉林和连栽杉木林乔木层净生产力分别为10.75、7.14 t·hm^(-2)·a^(-1),C年净固定量分别为5.05、3.47 t·hm^(-2)·a^(-1),年净吸收CO2量分别为18.53、12.73 t·hm^(-2)·a^(-1)。

The 23-year-old Taiwania flousiana plantations and successive rotations of Cunninghamia lanceolata plantations at Nandan Shankou Forestry Farm of Guangxi were tested by the methods of plot investigation combined with biomass measurement.Carbon storage and spatial distribution of different components in the 2 forest type were analyzed.The results showed that the carbon content in different organs of T.flousiana ranged from 426.0 g·kg-1 to 503.9 g·kg-1,ranking in the order of bark>stem>root>branch>leaf.The carbon content of shrub,herb and litter floor were 452.9,407.7 and 430.7 g·kg-1,respectively.The carbon content of the soil(0-80 cm)was 16.59 g·kg-1.The carbon content of different organs of C.lanceolata ranged from 464.5 g·kg-1 to 508.9 g·kg-1,ranking in the order of bark>stem>branch>root>leaf.The carbon content of shrub,herb and litter floor were 456.2,416.3 and 468.1 g·kg-1,respectively.The carbon content of the soil(0-80 cm)was 15.77 g·kg-1.The total carbon storage was 245.82 t·hm-2 for T.flousiana plantations and was 213.52 t·hm-2 for successive rotations of C.lanceolata plantations.The carbon storage of the T.flousiana and C.lanceolata plantations ecosystems ranked in the order of soil layer(0-80 cm)>vegetation>standing litter.Annual net productivity in the arbor layer of T.flousiana and C.lanceolata plantations were 10.75 and 17.14 t·hm-2·a-1,annual net carbon accumulation was 5.05 and 3.47 t·hm-2·a-1,and annual net CO 2 absorption of 18.53 and 12.73 t·hm-2·a-1,respectively.