33年生福建柏人工林碳库与碳吸存

Carbon Stock and Carbon Sequestration of a 33-Year-old Fokienia hodginsii Plantation

通过对福建三明33 a生福建柏和杉木人工林生态系统碳库和碳吸存的研究,结果表明,福建柏人工林碳库总量为 236.317 t/hm^2,低于杉木林(244.008 t/hm^2),其中地上部分和地下部分碳贮量分别占碳库总量 55.92％和44.08％。杉木人工林的林下植被和枯枝落叶层碳贮量分别是福建柏人工林的1.19倍和1.20倍。福建柏人工林乔木层有机碳年均积累量 11～20 a阶段达最大值,为 5.576t/hm^2·a^(-1),而杉木人工林最大值(5.817t/hm^2·a^(-1)较早出现于6～10 a阶段。福建柏人工林乔木层32至33 a碳净固定量为9.907 t/hm^2·a^(-1),折算成 CO2为36.326 t/hm^2·a^(-1),是杉木人工林的1.54倍,其中凋落物和死细根碳当年归还量分别为3.769 t/hm^2·a^(-1)和1.647 t/hm^2·a^(-1),分别是杉木人工林的1.75倍和1.31倍。

Carbon pool and carbon sequestration of a 33-year-old Fokienia hodginsii and a Cunninghamia Lance-olata plantation ecosystem were studied in Sanming, Fujian, China. The results showed that the amount of the carbon pool of F. hodginsii plantation ecosystem was 236.317 t/hm2, which was lower than that of Cunninghamia Lanceolata plantation ecosystem (244.008 t/hm2) , with above-ground and under-ground parts accounted for 55.92 % and 44.08 % , respectively. Carbon storage of undergrowth and forest floor in the C. lanceolata plantation was 1.19 and 1.20 times, respectively, as great as those in the F. hodginsii plantation. Greatest mean annual accumulation of organic carbon of tree layer of the F. hodginsii plantation was 5.576 t/hm2.a-1 during 11 to 20 year-old phrase, while that of C. lanceolata plantation was 5.817 t/hm2. a-1, came earlier during 6 to 10 year-old phrase. Current annual carbon net fixation of tree layer of the F. hodginsii plantation during 32 to 33 year-old was 9.907 t/hm2 . a-1, converted to 36.326 t/hm2 . a-1 of CO2, 1.54 times as great as that of the C. lanceolata plantation, of which current annual carbon return by literfall and dead fine roots was 3.769 t/hm2. a-1 and 1.647 t/hm2. a-1, respectively, and 1.75 and 1.31 times, respectively, as great as those in the C. Lanceolata plantation.