不同林龄桤木人工林生态系统的碳素密度  

Carbon density of Alnus cremastogyne plantation ecosystem with different ages

作　　者：杨丽丽[1] 文仕知[1] 

机构地区：[1]中南林业科技大学,湖南长沙410004

出　　处：《湖南林业科技》2010年第4期5-8,共4页Hunan Forestry Science & Technology

基　　金：中南林业科技大学青年基金项目2009013B资助

摘　　要：对不同年龄阶段桤木人工林生态系统碳素密度进行研究,结果表明：3年生桤木各器官的平均碳素密度变化范围为0.395 5~0.519 9 gC/g,5年生为0.419 9~0.543 5 gC/g,8年生为0.4337~0.545 3 gC/g,14年生为0.425 0~0.551 3 gC/g,变异系数均在0.25%~9.58%之间。不同年龄桤木各器官碳素密度表现大致为：树干〉树枝〉树叶〉树根〉树皮。随着桤木林年龄的增长,林下植被各组分、死地被物的碳素密度变化规律不明显。同一林分中各层次植物的碳素密度高低排列顺序为：乔木层〉活地被物层〉死地被物层。不同年龄桤木人工林生态系统土壤层平均碳素密度随着年龄的增加逐渐增加,且土壤各层的碳素密度随着土层深度的增加而逐渐下降。The carbon density of Alnus cremastogyne plantation ecosystem with different ages was studied in this paper.The results showed that the average carbon density of different organs varied from 0.3955gC/g to 0.5199gC/g for the 3-year-old plantation,from 0.4199gC/g to 0.5435gC/g for the 5-year-old stands,from 0.4337gC/g to 0.5453gC/g for the 8-year-old stands,and 0.4250gC/g to 0.5513gC/g for the 14-year-old plantation.The variation coefficient ranged from 0.25% to 9.58%.The carbon density of different organs ranked in the order as： stemsbranchesleavesrootsbark.No obvious trends were detected for the carbon density in different groups of under-storey of plants or the litter layer as the forest aged.The carbon density of different layers within a stand varied in the following order： tree layerground coverlitter layer.The soil carbon density of Alnus cremastogyne plantation ecosystem with different ages increased along with the increase of age while decreased as the soil depth increased.

关 键 词：桤木人工林 生态系统 年龄阶段 碳素密度 

分 类 号：S792.14[农业科学—林木遗传育种]