苦竹-杉木混交林界面区克隆分株秆形和地上生物量分配的适应策略

Pleioblastus amarus, a bamboo species with wide distribution, can be utilized for its high quality shoot and timber. The culm form and the biomass distribution pattern of aboveground components in the interface area P. amarus were analyzed to understand how the bamboo species adapt to heterogeneous habitats by this test. In this paper, pure stand of P. amarus, Cunninghamia lanceolata and mixed forest with P. amarus —C. lanceolata were selected to investigate culm form, aboveground biomass of 1-2 year-old P. amarus in the central and boundary zone of the pure forest and mixed forests. Results show that the differences of biomass accumulation and allocation of one-year old P. amarus in the interface area increased. Furthermore, the relative biomass of components and leaf biomass allocation under the interface area of P. amarus forest increased, while the relative biomass of components and leaf biomass allocation under the mixed forest interface decreased. However, the differences of biomass accumulation and allocation of two-year old bamboos decreased, and there was no significant difference on relative biomass of components and biomass allocation of two-year old bamboos on the two sides of the interface area. Meanwhile culm shape and the allometric growth of components biomass of the one-year old bamboo changed slightly, while allometric growth of culm biomass of two-year old bamboo increased in the interface area of P. amarus stand, and those of the branches and leaves decreased. All those results indicated that the culm shape and biomass allocation pattern of P. amarus obviously changed under the interface area by balancing the relationship of nutrients allocation to enhance suitability and fitness to heterogeneous environment.