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在毛竹和高节竹分布的界面区,由于相互侵入,常形成混交竹林,为比较毛竹、高节竹地下鞭根系统的可塑性和竞争能力,调查分析了毛竹、高节竹纯林及其混交林地下鞭根系统的形态结构特征和生物量分配规律。结果表明:高节竹鞭径、鞭节长、比根长、根长密度、根表面积密度、根体积密度和鞭生物量、根生物量、鞭根总生物量均显著低于毛竹,而比鞭长、鞭长密度和鞭节密度则相反,根径、分形维数差异不显著。高节竹与毛竹混交,会引起二竹种地下鞭根系统形态特征和生物量分配的明显变化,毛竹鞭径、鞭节长和高节竹鞭节长显著提高,毛竹鞭长密度、鞭节密度、比鞭长和高节竹鞭长密度、鞭节密度显著降低;毛竹、高节竹根长密度、表面积密度、体积密度、鞭生物量、根生物量、鞭根总生物量和根生物量比例显著下降,比根长和鞭生物量比例显著升高。毛竹、高节竹鞭根系统相对产量显著小于1,竞争平衡指数(高节竹/毛竹)显著小于0,且鞭根竞争平衡指数显著高于竹鞭。研究表明,毛竹比高节竹具有更高的地下鞭根系统可塑性,两竹种间存在激烈的种间竞争,毛竹竞争能力明显强于高节竹,鞭根在地下系统竞争中占主导作用。
In order to compare the plasticity and competitive ability of the rhizobium system of Moso bamboo and Takao bamboo, the mixed bamboo forest is formed due to mutual invasion, and the mixed bamboo Morphological and Structural Characteristics and Biomass Allocation of Rhizobium Root System in Forest Land. The results showed that the root length, root length, root length density, root surface area density, root bulk density and whip biomass, root biomass and total whorl biomass were all significantly lower than those of Phyllostachys pubescens Whip length, whip length and whip density is the opposite, root diameter, fractal dimension difference was not significant. The high bamboo and bamboo mixed, will cause the two bamboo species rhizobial root system morphological characteristics and biomass distribution of significant changes in the bamboo whip diameter, whip length and high section bamboo whip length significantly increased, bamboo whip length, whip The density of bamboo rhizome and the density of rhizome and the density of whip were significantly decreased. The density of bamboo root, surface area density, bulk density, whip biomass, root biomass, total rhizome biomass and root organism The proportion decreased significantly, the ratio of root length and whip biomass increased significantly. Phyllostachys pubescens, Phyllostachys pubescens root system relative yield was significantly less than 1, the competitive equilibrium index (high section bamboo / bamboo) was significantly less than 0, and whip competition root balance index was significantly higher than the bamboo whip. The results showed that the bamboo had higher root system plasticity than the bamboo, and there was intense interspecific competition between the two bamboo species. The competitive ability of bamboo was obviously stronger than that of the superior bamboo, and the rhizome root played a leading role in the underground system competition.