粉单竹秆形结构与生物量

Culm Form Structure and Biomass of Bambusa chungii

在广西南宁市测量粉单竹竹秆的全高、材长、胸径、节间数量及每节间三要素(直径、长度和壁厚)等秆形指标,对砍倒的立竹进行分段称重,研究这些指标与竹材生物量的关系。结果表明:材长、节间数量及三要素均与胸径相关密切,幂函数和线性方程拟合程度高。最长节间出现在第9~12节,最粗直径多在第4~6节。全株生物量中竹秆所占份额最大,为76.82%,各器官生物量依次为秆>蔸>枝>叶。单株竹秆鲜质量与胸径高度显著相关,可用二次线性方程进行较精确估算。研究秆形结构变化规律、全株及每段竹秆鲜质量分配格局,有利于促进粉单竹竹秆科学利用。

The total culm height,culm length,DBH,the number of internode and the three elements(diameter,length and wall thickness)of each internode of Bambusa chungii are measured in Nanning City,Guangxi,and the felled bamboo is weighed in sections,in order to study the relationship between the above indicators and the bamboo biomass.The results show that there is a significant correlation between the culm length,the number of internodes and the three elements of each internode and the DBH.The longest internode is the 9 th^12 th internode,and the internode with the largest diameter is often the 4 th^6 th node.Bamboo culm takes up the largest part of the biomass of the whole plant,accounting for 76.82%,and the biomass of each organ is ordered as culm>stump>branch>leaf.There is a significant correlation between the fresh weight of culm and DBH and height,which can be precisely estimated by quadratic linear equation.The study of the change rule of culm form structure and the distribution pattern of fresh weight of the whole plant and each section will facilitate the scientific utilization of the culms of B.chungii.