摘要
根据不同龄级和大小的龙竹个体生物量数据,建立了以胸径（D）为自变量的不同龄级龙竹各器官的生物量回归模型,测定了龙竹单株各器官的含水率和林分的生物量,分析了3个不同林龄的人工龙竹林的生物量组成和分配特征及其变化趋势。龙竹不同器官的含水率均随林龄呈现逐渐下降的趋势,茎秆的含水率下降幅度最大,枝次之,而根的含水率变化幅度最小。龙竹林的生物量随林龄而迅速增长,4年生龙竹林的生物量（19905.6kg/hm2）分别为3年生和2年生龙竹林生物量的3.27倍和8.73倍。3个不同林龄的龙竹林生物量的器官分配比例虽有所不同,但均以茎秆所占的比例最大（42.9%~49.4%）,根次之（21.6%~24.1%）,叶最小（11.8%~14.8%）,其器官分配的比例大小均呈现出茎秆〉根〉枝〉叶的规律性。
In order to study the biomass dynamics of artificial Dendrocalamus giganteus forest within different stand ages,three plots with a size of 25 m × 20 m were established,respectively,in three different artificial Dendrocalamus giganteu forests which were cultivated in 2007,2008 and 2009,in Menghai County,Xishuangbanna,Yunnan Province.By using the investigation data of sample individual of Dendrocalamus giganteu with different age and diameter at breast height,the moisture content in different organs of Dendrocalamus giganteu were measured,and the regression models of different organs biomass relating with D（diameter at breast height,1.3 m） were established to estimate the biomass of Dendrocalamus giganteu forests with different stand age.The results show that the moisture contents in different organs decreased gradually with increase of stand age,the degression of moisture content in stem was the biggest and of root was the smallest in four organs.Total biomass in 4-year-stand（19 905.6 kg/hm2） was 3.27 times and 8.73 times as much as that in 3-year-stand and 2-year-stand,respectively,which shows that total biomass rapidly increased with stand age.Concerning different parts allocation of biomass in three stands,the biomass of stem accounted 42.9 % ~ 49.4% of the total,and roots,twigs and leaves made up 21.6 % ~ 24.1%,15.7 % ~ 18.2% and 11.8 % ~ 14.8 %,respectively,which was ranked as stems 〉 roots 〉 twigs 〉 leaves in three different stands.
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2011年第12期54-60,共7页
Journal of Central South University of Forestry & Technology
基金
中法农村CDM试点开发试点与能力建设项目
关键词
人工龙竹林
生物量
回归模型
西双版纳
artificial Dendrocalamus giganteu forest
biomass
regression models ~ Xishuangbanna
