西南桦纯林与混交林生态系统C贮量的对比研究

利用测定生物量的方法对13年生西南桦人工纯林、西南桦+肉桂混交林、西南桦次生林和热带次生林进行了C贮量的对比研究。结果发现4种林分的C密度分别为148.42、140.33、108.25、129.38 t.hm-2;年固C量分别为4.01、4.59、3.71、2.42 t.hm-2.a-1;地上生物质C密度分别为42.18、45.61、40.12、23.08 t.hm-2;地下生物质C密度分别为9.73、14.06、8.10、8.41 t.hm-2;林分凋落物C密度分别为6.03、8.81、3.03、2.61 t.hm-2;林地土壤C密度分别为82.38、79.94、57.00、95.28 t.hm-2。结果表明西南桦是开展以固C为目标的生态造林项目的适合树种。

Comparative analysis of ecosystem carbon stocks for pure and mixed stands of Betula alnoides

Biomass measurement method was applied to conduct comparative study of carbon storage capacity between 13 years old Betula alnoides monoculture,mixed plantation with Cinnamomum cassia,B.alnoides secondary forest and tropical secondary forest.The results showed that the carbon density in monoculture,mixed plantation,B.alnoides secondary forest and tropical secondary forest were 148.42,140.33,108.25,and 129.38 t·hm-2 respectively.The annual rate of carbon sequestration of these 4 forests were 4.01,4.59,3.71,and 2.42 t·hm-2·a-1 respectively.The carbon density of above ground part of these 4 stands were 42.18,45.61,40.12,and 23.08 t·hm-2 respectively.The root system carbon densities of these 4 stands were 9.73,14.06,8.10,and 8.41 t·hm-2 respectively.The litter carbon density of these 4 stands were 6.03,8.81,3.03,and 2.61 t·hm-2 respectively.The soil carbon density of 4 stands were 82.38,79.94,57.00,and 95.28 t·hm-2 respectively.This implies that B.alnoides is promising species for reforestatation taking the carbon sequestration as the management purpose.