峨热竹无性系种群地上部分生物量结构与模型研究

A Study of Aboveground Biomass Structure and Models of Clonal Population of Arundinaria spanostachya

通过对四川省石棉县栗子坪自然保护区峨热竹分株地上部分基径、枝下高、全高及分株各构件生物量进行调查和测量,研究了其地上部分生物量分配结构和形态可塑性,构建了地上部分生物量模型。研究表明:峨热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;峨热竹分株总生物量表现出多年生>2年生>1年生的分配特征,而同一分株各构件间则表现出秆>枝>叶的生物量分配格局;基径分别与各龄级秆生物量和总生物量具有显著相关性,而全高与2年生及多年生枝叶生物量具有显著相关性;以基径和全高为自变量分别建立的线性模型可为相似区域峨热竹不同龄级分株秆和枝叶构件生物量的估测提供借鉴。

Based on the investigation and measurement of the diameter at the base, under branch height, full height and organ biomass ofArundinaria spanostachya in Liziping Nature Reserve in Shimian County, Sichuan Province, the aboveground biomass structure and the morphological plasticity were studied, and the models of aboveground biomass were constructed. The results showed that： （1） The water content of ramets tends to decrease with age, but at the same age, water content of ramets could be ordered by leaves 〉 branches 〉 culms; （2） The total biomass of all ramets presented as perennial bamboo 〉 two-year bamboo 〉 annual bamboo, while the biomass was different among organs in a same ramet with the order of culms 〉 branches 〉 leaves; （3） The diameter at the base had significant correlation respectively with the clum biomass and the total biomass among different ages, and the full height had significant correlation with the biomass of leaves of two- year bamboo and perennial bamboo; （4） The linear models constructed with the diameter at the base and the full height could speculate the leave, culm and branch biomass ofA. spanostachya among different ages in the similar areas.