Phenotypic Plasticity of A Dominant Bamboo Species( Phyllostachys glauca) in Limestone Mountain in Northwest of Jiangxi Province
The soil in limestone mountain is highly heterogeneous due to the high rock coverage in Ruichang,northwestern Jiangxi Province.Phyllostachys glauca,a bamboo species,is a dominant species in the limestone mountain.According to the rock coverage,the soil habitats were divided into three types,which are continuous soil(CS),semi continuous soil(SCS) and sporadic soil(SS) respectively.In order to explore the phenotypic plasticity of P. glauca,the ramet population characteristics,the biomass of ramet and modular,the biomass allocation pattern of ramet, and modular morphological characteristics were analyzed. The results showed that:(1) With the increasing of soil rock coverage,the ramet density decreased and the ramet biomass increased to maintain the population biomass,while the root/shoot ratio was similar between the CS,SCS and SS(P>0.05).(2) In SCS and SS,the fraction of leaf biomass declined dramatically,and the fraction of stem biomass boosted significantly compared with that of CS(P<0.05).Those plastic changes are an adaptation strat-egy to soil water deficit,which helps to reduce the water consumption and store more water in stem.(3) The indices of ramet size such as height,basal diameter,height under branch,number of nodes etc. increased with the increasing of rock coverage,and it promoted the ramet biomass.Meanwhile,the number of branching,angle of rhizome branching and specific leaf area( SLA) were higher in SCS and SS than those of CS. Based on the morphological alterations,the ramet dispersed the leaf more uniformly in the horizontal and vertical directions. Thus,it enhanced the efficiency for solar energy utilization,and offset the reduction of leaf biomass fraction.The results indicated that P. glauca.show strong clonal plasticity in ramet leavel and modular level in the limestone mountain,and the modification is more precise in modular level.
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