不同栽杉代数杉木林C库与C吸存

Carbon Stock and Carbon Sequestration of Successive Planting Chinese Fir in Different Rotations

对福建南平市王台镇溪后村安曹下及邓窠的不同代数杉木林C库和C吸存的研究结果表明,1代杉木林C库总量为251.165t/hm2,分别为2代(193.471t/hm2)和3代(161.716t/hm2)的1.29倍和1.55倍,其中活植物体和死生物体C贮量分别占72.91%和27.09%。而林下植被碳贮量随着连载代数的增加而增加,3代林分别为2代林、1代林的2.33倍和3.67倍。1代杉木林枯枝落叶层的C贮量为2.799t/hm2,是2代和3代的1.09倍和1.52倍。1代杉木林土壤的C贮量分别是2代和3代的1.09倍和1.19倍。1代、2代和3代杉木林土壤有机碳贮量均随深度的增加而减少。1代杉木林乔木层C当年净固定量为7.653t/hm2,分别是2代和3代的1.46倍和1.9倍。1代杉木林C年归还总量(凋落物量)是1.25t/(hm2·a),分别是2代和3代的1.1倍和1.34倍。

The carbon stock and carbon sequestration of Chinese fir in different generations were investigated in Aneaoxia and Denke of Xihou Village, Nanping City, Fujian Province. Results showed that the total carbon stock of the first generation （FG） stands was up to 251.165 t/hm^2, being 1.29 and 1.55 times as much as that in the second generation （SG, 193.471 t/hm^2） and the third generation （TG, 161.716 t/hm^2） stands, respectively. The living plants and dead organisms accounted for 72.91% and 27.09% in the generation one. Carbon storage of undergrowth reduced with the increase of generation, which in the TG stand was 2.33 and 3.67 times as much as that in the SG and FG stands. The carbon storage of litterfall in the FG stand was 2.799 t/hm^2, which was 1.09 and 1.52 times as much as that in the SG and TG stands. The carbon storage of soil in the FG stand was 1.09 and 1.19 times as much as that in the SG and TG stands. Net carbon fixation of the tree layer were 7.653 t/hm^2 in the FG stand, being 1.46 and 1.9 times as much as that in the SG and TG stands. The annual carbon return by litterfaU in the FG stand was 1.25 t/（hm^2·a）, which was 1.10 and 1.34 times as much as that in the SG and TG stands.