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为探寻石灰岩山地优势种淡竹(Phyllostachys glauca)的表型可塑性变化,对赣西北连续土、半连续土和零星土3种石灰岩土被生境设置样地进行调查,分析了不同生境淡竹的分株种群特征、分株与构件生物量及其分配、分株构件形态特征,结果表明:(1)随着裸岩率增加,淡竹的分株密度降低,平均分株生物量增加,种群生物量以半连续土生境最高,零星土和连续土生境大致相当;(2)在分株水平方面,3类生境的根冠比没有显著差异(P>0.05);与连续土生境相比,半连续土和零星土生境的淡竹叶生物量分配显著减少,秆生物量分配显著增加(P<0.05);(3)表征淡竹分株大小的指标(株高、基径、枝下高、节数等)随着裸岩率升高而增大;半连续土和零星土生境淡竹的分枝数、地下茎分枝角度和比叶面积显著增高,使淡竹叶片分布更分散,提高了光能利用效率。研究认为,淡竹在分株水平和分株构件水平均产生了对石灰岩高异质生境的表型可塑性调整。在水分亏缺的高裸岩率生境,淡竹减少叶生物量分配和增加秆生物量分配可能是降低水分消耗和提高水分贮存的表型调节行为;叶片散布及光能利用效率提高则是对叶生物量分配减少的补偿。
In order to explore the phenotypic plasticity change of Phyllostachys glauca in limestone mountainous area, three kinds of limestone soil samples from continuous, semi-continuous and scattered soil in northwestern Jiangxi Province were investigated for habitat setting. The ramets in different habitats were analyzed. The results showed: (1) With the increase of bare rock rate, the ramets’ density decreased, the average ramets biomass increased, and the biomass of the ramets in half (2) There was no significant difference in the ramet level between the three types of habitats (P> 0.05). Compared with the continuous soil habitats, the semi-continuous soils (3) The indexes (plant height, basal diameter, branch height, number of nodes, etc.) characterizing the size of light-colored bamboo stand were significantly different with those of the control While the rate of bare rock increased. The number of branches, the branch angle of underground stem and the specific leaf area of semi-continuous soil and scattered soil were significantly increased, which made the distribution of light bamboo leaves more dispersed and improved the utilization efficiency of light energy. The study suggests that the light bamboo at the ramets and ramets members have produced a high heterogeneous habitat limestone phenotypic plasticity adjustment. In the water-deficit high-bare-rock habitat, light bamboo reduced leaf biomass allocation and increased stalk biomass allocation may be phenotypic adjustment behaviors that reduce water consumption and improve water storage; leaf dispersal and light energy utilization efficiency are the opposite Compensation for reduced biomass allocation.