冷箭竹无性系分株生物量分配与估测模型

Biomass Allocation and Estimation Models of Bashania faberi Clonal Ramets

通过对大熊猫国家公园卧龙片区的冷箭竹无性系分株地上部分地径、株高及分株各构件(秆、枝、叶)生物量进行调查,研究了其地上部分生物量的分配结构和垂直分布规律,构建了基于地径、株高和D^(2)H与不同龄级各构件和分株生物量之间的异速生长模型。研究表明:冷箭竹各分株含水率随年龄增长呈下降趋势,同一龄级分株构件含水率高低表现为叶>枝>秆,各构件含水率的垂直分布规律不同,竹秆呈现为“U”型分布模式,竹枝随高度增加而递增,竹叶为正态分布特征;冷箭竹不同龄级分株生物量表现出多年生>2年生>1年生的分配特征,而同一龄级分株的各构件间则表现为竹秆>竹枝>竹叶的生物量分配格局,各龄级的竹秆生物量都表现出随着高度的增加而递降的趋势,而竹枝和竹叶近似于正态分布模式;除1年生竹的竹叶外,地径、株高和D^(2)H分别与各龄级各构件生物量和分株生物量之间均具有显著相关性;以地径、株高和D^(2)H为自变量分别建立的异速生长模型可为相似区域冷箭竹不同龄级分株各构件生物量的估测提供参考。

By measuring the basal diameter,plant height and biomass of each aboveground part(stem,branch and leaf)of arrow bamboo(Bashania faberi)clonal ramets in Wolong area of the Giant Panda National Park,the allocation pattern and vertical distribution of the aboveground biomass were studied,and the allometric models were constructed based on the basal diameter(D),culm height(H)and D^(2) H to predict the biomass of each part and the whole ramet of different age groups.The results showed that the water content of ramets decreased as their age increased.Parts of ramets in the same age group,ranked in descending order of water content,were as follows,leaf,branch and stem.The vertical distributions of water contents of all parts were different.The water content of stems appeared to have a U-shape distribution,the water content of branches increased with the increase of height,and the water content of leaves showed a normal distribution.The biomass allocation among B.faberi ramets of different age groups showed a descending pattern as follows,perennial(3y/o and above),2y/o and 1y/o,while the biomass allocation among different ramet parts of the same age group followed a descending order of stems,branches and leaves.The biomass of bamboo stems of all age groups decreased with the increase of height,while the biomasses of branches and leaves nearly followed a normal distribution.The basal diameter,plant height and D^(2) H were significantly correlated with the biomass of each part and the whole ramet of different age groups,except for the leaves of 1y/o bamboo.The allometric models established with basal diameter,culm height and D^(2) H as independent variables can provide reference for the estimation of the biomass of each ramet part of different age groups in similar areas.