摘要
毛竹是一种克隆植物,具有复杂的地下鞭根系统。由于研究手段的缺乏和鞭根系统较强的克隆生长特性,关于毛竹地下竹鞭空间分支系统及其功能属性的研究较少。本文对地下竹鞭及其立竹进行分级,进而结合实测的数据,分析毛竹同一竹鞭的长度和直径沿着鞭级的变化规律,以及同级竹鞭与鞭根、不同级别地上立竹的数量特征。结果发现,与母竹相连的竹鞭直径和长度沿着去鞭的方向不断增加,同级鞭根与竹鞭的生物量具有很好的幂函数关系,鞭径与其对应的1~4级母株具有显著的相关关系,与第五级母株没有相关性,而且1~2级比3~4级母竹对地下竹鞭的支持作用更大。本文提出的竹鞭及其立竹分级框架,有助于深入研究毛竹地下竹鞭分支结构及其功能属性的关系。
As a clonal plant, Phyllostachys edulis, commonly called moso bamboo, can grow rap- idly with a complex belowground branching system. Owing to the lack of effective research method and the strong clonal expansion ability of belowground rhizome system, few researches have been conducted on the horizontally spatial hierarchical system and its relation to the functional attrib- utes of bamboo rhizome. Here, a hierarchical system of bamboo rhizome and its standing culm of P. edulis were presented. Then, the change of both diameter and length of bamboo rhizome with rhizome order, and the correlations between rhizome and its rhizome root and between below- ground rhizome and its standing culm, were examined. Both diameter and length of moso bamboo rhizome decreased with the increasing rhizome order; in other words, they increased from the proximal end to the distal end. The relationship between biomass of bamboo rhizome and its corre- sponding rhizome root was best characterized by a power function. The diameter of belowground bamboo rhizome was significantly correlated to the diameter at breast height of the first four-order standing culms, but not to that of the fifth order. Regression analysis indicated that the first two orders contributed more to the growth of belowground bamboo rhizome than both the third and the fourth orders of standing culms. These results of the present paper suggested that the belowground rhizome system of P. edulis is a highly heterogeneous hierarchical system, and the hierarchical rhizome system proposed here is conducive to carry out a more in-depth research into bamboo rhi- zome hierarchical structure and its functional attributes.
出处
《生态学杂志》
CAS
CSCD
北大核心
2017年第12期3479-3484,共6页
Chinese Journal of Ecology
基金
国际竹藤中心基本科研业务费重点专项(1632015005)
国家自然科学基金项目(31300177)资助
关键词
异速生长关系
竹鞭
分级系统
鞭级
鞭根
allometry
bamboo rhizome
hierarchy system
rhizome order
rhizome root.
