不同生境中慈竹克隆生长的密度调节

Density Regulation of Clonal Growth of Neosinocalamus affinis in Different Habitats

为了全面认识竹类植物克隆生长的密度调节机制,通过对两种生境的野外调查,本文在基株和分株两个层次上分析了慈竹克隆繁殖的数量和质量、竹笋高生长速度以及根茎长度等克隆生长特征与密度的关系.结果表明,慈竹的一些克隆生长特征(如:出笋数、死笋数、出笋速度、活笋基径和根茎长度)与分株密度呈不同程度的正相关,而竹笋高生长速度与分株密度无关.仅西山慈竹的出笋数和北湖公园的活笋数与基株密度呈显著的正相关.这些结果显示慈竹的克隆生长受分株密度和基株密度的共同调节,且以分株调节为主.不同生境中,慈竹克隆生长及其密度制约的规律存在差异.

A field experiment was conducted in Nanchong,Sichuan, to investigate the mechanism of density regulation in Neosinocalamus affinis. We have analyzed the relationships between the number and quality of clonal propagation, growth rate of new shoots, rhizome length and density at the ramet and genet levels in two different habitats. There are significantly positive correlation between some characteristics of clonal growth (such as the number of emerging and dead new shoots, the emerging rate of new shoots, basal diameter of surviving new shoots and rhizome length) and ramet density. Significantly positive correlations occur only between the number of emerging new shoots at Xishan, the number of surviving new shoots at Beihu Park and genet density. The results show the clonal growth of N. affinis is regulated by ramet density and genet density, but mainly by ramet density. Different habitats differ in clonal growth of N. affinis and its density regulation.