Carbon storage and their allocation of young-and-middle aged conifer-broadleaf mixed forests in southern subtropical region
ZHOU Li;ZHANG Weiqiang;TANG Honghui;CHEN Weiguang;WEI Dan;PAN Lijun;SU Murong;Guangdong Academy of Forestry;Maintenance Center for Yunyong Ecological Forest of Foshan;
To evaluate the carbon storages and their allocations in young-and-middle aged conifer-broadleaf mixed forests in southern subtropical region of China. 12 plots belonging to different forest ages were selected and plant biomass and soil carbon content were measured. The biomass of tree layer was calculated through analyzing the 12 sampling sites and the existing biomass models by typical plot investigation, while the biomasses of shrub, herb and litter layers were calculated using the full harvest method. The soil layer was investigated using soil profile method in combination with soil drilling method. Carbon content of representative samples was measured using potassium dichromate-external heating method. The average carbon concentration of root, stem, branch and leaf were 45.07%, 46.73%, 46.30% and 47.72%, respectively. The average carbon concentration of plant followed the order: tree shrub herb. Carbon storage of tree accounted for 63.38%~94.08% of the plant, carbon storage in shrub accounted for 3.55%~12.67%, while carbon storage in herb accounted for 1.28%~23.95%. The average carbon storage of tree and shrub increased with increasing forest age, on the contrary, average carbon storage of herb decreased with forest age. Carbon storage in soil layer ranged from 106.73 to 136.61 t·hm-2, and that of soil first decreased and then increased with increasing forest age. The total carbon storage of conifer-broadleaf mixed forests with different forest ages ranged from 134.79 to 162.60 t·hm-2, and carbon storage and their allocation were in the order of soil layervegetation layerlitter layer. Carbon storage of soil, vegetation and litter layers accounted for 78.34%~94.45%, 4.84%~20.16%, and 0.71%~1.50% of total carbon storage of conifer-broadleaf mixed forests, respectively. Soil layer was the dominant bank in young-and-middle aged conifer-broadleaf mixed forest. The study provided insight into the tree species selection, carbon sequestration potential in planted forests and the management of forest carbon sinks plantations.
【Fund】： 国家林业公益性行业科研专项(201404301);; 广东省林业科技创新专项项目(2010KJCX013-02);; 佛山市生态景观林培育技术研究与推广示范;; 国家林业局广东东江源森林生态站联合资助
【CateGory Index】： S718.55
【CateGory Index】： S718.55