摘要
对杉木林生物量和净生产力、碳含量进行了动态观测 ,对杉木林生态系统碳收支平衡公式进行了探讨与推算 .结果表明 :杉木不同器官中碳含量排列顺序为树皮 >树叶 >树干 >树根 >球果 >树枝 ;不同年龄枝、叶碳含量以多年生枝、叶较高 ,11年生的杉木各器官碳含量略高于 10年生的 ;同一林分中各层次的碳含量高低顺序为乔木层 >灌木层 >草本层 ;死地被物层碳含量为 43.40 % ,土壤各层次的碳含量随着土壤层次加深而减少 ;7年生至 11年生的杉木林生态系统的碳库总量为 10 6.0 1~ 14 4.2 2 t· hm- 2 ,其中植被层为 15 .37~ 35 .0 9t· hm- 2 ,凋落物层为 0 .31~ 2 .5 8t· hm- 2 ,土壤层为 88.0 6~ 10 7.73t· hm- 2 ;10年生至 11年生杉木林植被层 CO2 同化年净增量为 19.0 5~ 18.0 8t· hm- 2 ,凋落物层为 1.12~ 4.2 2 t· hm- 2 ;随着林龄的增长 ,系统 CO2 的平衡值由负值变为正值 ,杉木林生态系统 10年生以前主要向大气释放 CO2 ,10年生后则吸收固定 CO2 ,这时才具有 CO2 汇的功能 .
After a carbon balance formula was formulated, the dynamics and balance of carbon was studied based on the mobile observation of biomass, net productivity and carbon content in the second generation Chinese fir plantation. The results show as follows. The carbon content in different organs of Chinese fir ranks in the order as:bark>leaf>trunk>root>cone>branch. The perennial branch and leaf has the highest carbon content among Chinese fir forests at different age. In 11 year old Chinese fir plantation, the carbon content in different organs is higher than that of 10 year olds'. The carbon content of different layer within stand is in the order as:tree>shrub>herb. The carbon content in litter accounts for 43.40%. The carbon content in the soil decreases as the depth increases. The total carbon storage varies from 106.01 to 144.22 t·hm -2 with the forest growth for 7 to 11 years. Among this, the trees occupy 15.37~35.09 t·hm -2 , the litter 0.31~2.58 t·hm -2 , and the soil 88.06~107.73 t·hm -2 . For the 10 year old and 11 year old forests, the annual net accumulation of CO 2 in the vegetation is 19.05~18.08 t·hm -2 a -1 , and in the litter 1.12~4.22 t·hm -2 a -1 . And CO 2 budget value changes from below zero to above zero with the increase of the age. Chinese fir plantation also whows absorptive and solidifying function of CO 2 after 10 years' growth.
出处
《中南林学院学报》
CSCD
2002年第1期1-6,共6页
Journal of Central South Forestry University
基金
国家科技部重点野外科学观测试验站 (编号 :[2 0 0 0 ]国科基便字第 0 76)
国家自然科学基金重大项目 (编号 :39899370 )
国家林业局重点项目 (编号 :2 0 0 1-0 7)
湖南省科委重大项目 (编号 :99JZY10 0 4)资助
关键词
幼林
生态系统
碳动态
第二代杉木林
碳平衡
碳贮量
second generation Chinese fir plantation
carbon dynamics
carbon balance
carbon storage