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.
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
关键词
桤木人工林
生态系统
年龄阶段
碳素密度
Alnus cremastogyne plantation
ecosystem
different age
carbon density
