关键词: 速生阶段, 杉木人工林, 碳素密度, 碳贮量

Abstract:

Based on the data collected by located observation, the density, storage and spatial distribution of carbon were studied in Chinese fir plantation at fast growing stage. The results showed that carbon density in different organs of Chinese fir ranged from 0.4558 gC·g^-1 to 0.5003 gC·g^-1,and was in the order as: bark>leaf> trunk>root>cone >branch. The carbon density in the perennial branch and leaf was higher than that of the youngers'. Carbon density in shrub, herb and floor was 0.4344?gC·g^-1, 0.4009 gC·g^-1 and 0.4341 gC·g^-1, respectively. Carbon density of the surface soil was a little lower than that of the second surface soil. Carbon storage in different organs was basically in direct proportion to the biomass of respective organ ,biomass of trunk made up 47 7% of the standing forest biomass, correspondingly its carbon storage amounted for 47.5% of the standing forest carbon storage , the rest in branch, leaf, bark and root, etc., seized 52.5%. The total carbon storage in Chinese fir plantation at fast growing stage was up to 127.88 tC·hm^-2,including 35.883 tC·hm^-2 in the plant, and 91.997 tC·hm^-2 in the soil (including floor). The annual net productivity of Chinese fir plantation at fast growing stage was 7.351 t·hm^-2a^-1, stored carbon up to 3.489 tC·hm^-2a^-1. Forest was an important sink of atmospheric CO₂.

Key words: Fast growing stage, Chinese fir plantation, Carbon density, Carbon storage