关键词: 人工林, 碳库, 格氏栲, 杉木

Abstract:

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.

Key words: plantation, carbon storage, Castanopsis kawakamii, Cunninghamia lanceolata