亚热带日本落叶松人工林生态系统碳密度及其分配特征  

Density and distribution of organic carbon of Larix kaempferi plantation ecosystem in Subtropics

作　　者：马丰丰[1] 张灿明[1] 李有志[1] 

机构地区：[1]湖南省林业科学院,湖南长沙410004

出　　处：《中南林业科技大学学报》2016年第1期94-100,共7页Journal of Central South University of Forestry & Technology

基　　金：国家"十一五"科技支撑项目(2006BAD24B0603)

摘　　要：对亚热带日本落叶松人工林生态系统的有机碳密度进行了估算,结果表明：（1）乔木层平均含碳率为56.15%-64.51%,表现出树干〉树枝〉树皮〉树根〉树叶,灌木层、草本层以及凋落物层平均含碳率分别为53.79%、41.61%、54.98%,0-80 cm土壤层的平均含碳率为2.42%,且随着土层厚度的增加而减少;（2）日本落叶松人工林总碳密度为268.92 t/hm^2,其中,植被层、凋落物层、土壤层分别占总碳密度的35.23%（94.74t/hm^2）、0.72%（1.93 t/hm^2）、64.05%（172.25 t/hm^2）。土壤碳密度约为植被碳密度的1.81倍;（3）混交林生态系统碳密度略高于纯林;（4）中龄林（317.53 t/hm^2）约为幼龄林（235.56 t/hm2）的1.35倍。乔木层、凋落物层碳密度在日本落叶松林生态系统的比重随着林龄的增长而升高,而土壤层所表现的趋势与之相反。（5）日本落叶松人工林生态系统各组分的有机碳密度均明显高于20年生的杉木人工林,从侧面也反映了同样作为亚热带地区的造林树种,日本落叶松林要优于杉木人工林。For that, the density of organic carbon in tree plantation ecosystem （L.kaempferi） was large-scale investigated in Subtropics. The results show that （1） the average carbon content rates of the tall tree layer ranged from 56.15% to 64.51%, the average carbon content rates in various organs ordered from big to small： trunk 〉 branch 〉 bark 〉 root 〉 leaf; Carbon content rates of the shrub layer, herb layer and litter layer was 53.79%, 41.61%, 54.98% respectively; And the carbon content rate of 0 - 80 cm soils was 2.42% and decreased with the increase of soil depths. （2） Total organic carbon density was 268.92 t/hm^2, of them 94.74 t/hm^2 （35.23%） in vegetations, 1.93 t/hm^2 （0.72%） in litter layer, and 172.25 t/hm^2 （64.05%） in soils; The density of organic carbon in soils was 1.81 times of that in vegetations. （3） The organic carbon density in mixed forest was slight higher than that in pure forest. （4） The organic carbon density in middle-aged forest （317.53 t/hm^2） was 1.35 times of young forest （235.56 t/hm^2）; The proportion values of organic carbon density in tall tree layer and litter layer increased with the increase of stand-age, while that in soil layer was opposite. （5） The organic carbon density in various groups of L.kaempferi plantation ecosystem were obviously higher than those of 20-years-old Cunninghamia lanceolata plantation. Its reflected from the side that L. kaempferi forest was superior to C.lanceolata plantation as the same afforestation species in subtropical areas.

关 键 词：日本落叶松人工林 生态系统 有机碳密度 有机碳分配特征 亚热带 

分 类 号：S791.223[农业科学—林木遗传育种] S718.56[农业科学—林学]