南亚热带杉木生态系统生物量和碳素积累及其空间分布特征  

Characteristics of Biomass,Carbon Accumulation and Its Spatial Distribution in Cunninghamia lanceolata Forest Ecosystem in Low Subtropical Area

作　　者：康冰[1,2] 刘世荣[2] 蔡道雄[3] 卢立华[3] 

机构地区：[1]西北农林科技大学生命科学学院,杨凌712100 [2]中国林业科学研究院森林生态环境与保护研究所,北京100091 [3]中国林业科学研究院热带林业实验中心,凭祥532600

出　　处：《林业科学》2009年第8期147-153,共7页Scientia Silvae Sinicae

基　　金：国家林业科技支撑资助项目(2006BAD03A0402;2006BAD03A040101);西北农林科技大学人才基金

摘　　要：Carbon accumulation and distribution were studied in three plots of a 13 years old Chinese fir （Cunninghamia lanceolata） forest in Daqingshan,Guangxi. The results showed that the average carbon concentration in all organs was in the following order: leaf （510.5）>bark （501.8）>wood （485.1）>root （476.5）>branch（462.1） （g·kg -1 ）. The carbon concentration of soil （to 60 cm depth） ranged from 11.4 to 21.1 （g·kg -1 ）,with an average of 16.6 （g·kg -1 ）. Carbon concentration of surface soil （to 20 cm） was higher than the other layer. The average carbon concentrations （g·kg -1 ） in different layers were in the order as: trees （497）> shrub （437.5） >standing litters （437.5）>herb （407.8）. The carbon storage of the forest ecosystem was in order of soil layer>vegetation >standing litter. Of total average carbon,23.87% was in vegetation component,74.27% in soil （60 cm depth）,and only 1.86% in standing ground litter layer. The tree layer occupied 22.93% of total carbon storage in the ecosystem and 96.07% of carbon storage in the vegetation layer. The carbon storage in different organs was positively related to the biomass of corresponding organs. Trunk accumulated the highest carbon storage,comprising 58.40% of carbon storage in tree layer. Secondly,root made up 20.09% of total tree carbon. The annual net productivity of Chinese fir plantation was 10.10 t·hm -2 a -1 ,stored carbon up to 4.67 t·hm -2 a -1 ,equal to 17.13 t·hm -2 a -1 of CO2. Chinese fir plantation was an important sink of atmospheric CO2. But its capacity of C sequestration decreased gradually in this region.Carbon accumulation and distribution were studied in three plots of a 13 years old Chinese fir （Cunningharnia lanceolata） forest in Daqingshan, Guangxi. The results showed that the average carbon concentration in all organs was in the following order： leaf （510.5） 〉 bark （501.8） 〉 wood （485.1） 〉 root（476.5） 〉 branch（462.1） （g·kg^-1）. The carbon concentration of soil （to 60 cm depth） ranged from 11.4 to 21.1 （g·kg^-1）, with an average of 16.6 （g·kg^-1）. Carbon concentration of surface soil （ to 20cm） was higher than the other layer. The average carbon concentrations （ g·kg^-1） in different layers were in the order as ： trees （497） 〉 shrub （437.5） 〉 standing litters （437.5） 〉 herb （407.8）. The carbon storage of the forest ecosystem was in order of soil layer 〉 vegetation 〉 standing litter. Of total average carbon, 23.87 % was in vegetation component, 74.27 % in soil （60 cm depth）, and only 1.86 % in standing ground litter layer. The tree layer occupied 22.93 % of total carbon storage in the ecosystem and 96.07 % of carbon storage in the vegetation layer. The carbon storage in different organs was positively related to the biomass of corresponding organs. Trunk accumulated the highest carbon storage, comprising58.40% of carbon storage in tree layer. Secondly, root made up 20.09% of total tree carbon. The annual net productivity of Chinese fir plantation was 10.10 t·hm^-2a^-1, stored carbon up to 4.67 t·hm^-2a^-1, equal to 17.13 t·hm^-2a^-1 of CO2. Chinese fir plantation was an important sink of atmospheric CO2.But its capacity of C sequestration decreased gradually in this region.

关 键 词：生物量 碳贮存 空间分布 杉木人工林 极限分布区 南亚热带 

分 类 号：S718.556[农业科学—林学]