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Carbon Storage and Allocation in Castanopsis kawakamii and Cunninghamia lanceolata Plantations in Subtropical China

Yang Yusheng1 Chen Guangshui1 Wang Yixiang2 Xie Jinsheng3 Yang Shaohong3 Zhong Xianfang1(1.Fujian Key Lab. of Subtropical Resources and Environment College of Geography Science,Fujian Normal University Fuzhou 350007;2. Fujian Academy of Agricultural Sciences Fuzhou 350002; 3. College of Forestry,Fujian Agricuture and Forestry University Fuzhou 350002)  
Carbon storage and component was compared between two 33_year_old plantations of broad-leaved species,Castanopsis kawakamii (CaK),and conifer species,Cunninghamia lanceolata (Chinese Fir,CF),in Sanming,Fujian Province. Total carbon storage was 325.9 and 228.3 t·hm -2 ,respectively,in the CaK and the CF,of which the tree layer accounted for 65.9% and 57.5% and the mineral soil occupied 32.5% and 40.3%,respectively. The contributions of the undergrowth,litter layer,coarse woody debris (CWD) and dead fine root to the total carbon pool was no more than 1%. In the CaK,55.8% of the tree carbon pool was comprised of stem woods plus barks,compared with 75.4% in the CF. Though annual current C accumulation rate in the CaK prior to 6_year_old was slightly lower than in the CF,it gradually exceeded that in the CF after 7_year_old. The annual current C accumulation rate peaked at age 15 in the CaK and at age 10 in the CF. The maturity age for carbon accumulation was 20-year-old in the CF and was longer than 33_year_old in the CaK. With respect to carbon sequestration,CaK was superior to CF as a carbon plantation.
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