连栽对杉木人工林碳贮量的影响研究

选择不同栽植代数(1、23、代)、不同发育阶段(幼龄林、中龄林和成熟林)的杉木人工林进行不同栽植代数杉木林含C率、C贮量和年净固C量比较研究结果表明,不同栽植代数杉木林的含C率在45%~55%之间,不同代数间差异不明显,同一栽植代数相同发育阶段杉木林乔木层各器官含C率表现为皮>叶>干>根>枝。随栽植代数增加,杉木林C贮量和年净固C量明显降低,但不同发育阶段杉木林代数间差异程度不同,中龄林代数间差异最明显,与1代中龄林相比,2、3代杉木林C贮量分别下降16.98%和63.60%,年净固C量分别下降14.01%和25.14%。

Effects of successive planting on carbon storage of Chinese fir forest

The effect of successive planting on the carbon content,carbon storage and annual net carbon fixation of Chinese fir with different ages were measured.The results show that the carbon content is not influenced significantly by the planting generation,and the carbon contents of the organs in the same generation and age are in the sequence as following:bark>leaf>stem>root>branch.Whereas there are significant differences of carbon storage and annual net fixation(among) different generation stands,which decrease with the increment of planting generation.The maximum differences of carbon storage and annual net carbon fixation are those of the middle-aged stand.Compared with the first generation of the middle-aged stand,the second generation stand and the third generation stand own decreased carbon storage,which are lower by 16.98% and 63.60%,respectively,and annual net carbon fixation which are lower by 14.01% and 25.14%.