关键词: 核桃, 核桃, 光合, 种植密度, 光能利用效率

Abstract: In order to rationally configure Phoebe bournei updated layer, a research for the growth influence and the phenotypic plasticity of 10-years-old of P. bournei with different habitats was conducted in Mingxi Fujian. The results showed that: (1) Understory habitats had a significant impact on the growth of 10-year-old of P. bournei plantations, and the sequence of promoting growth of P. bournei plantations form high to low was canopy gap, understory. Understory habitat selection and configuration is a key measure of understory P. bournei plantations. (2)Understory habitats had a very significant impact on the plant morphology, showed a strong phenotypic plasticity. crown length, and the crown rate of P. bournei in canopy gap were significantly greater than those in the understory habitats. (3) understory habitats didn’t bring significantly change on stem biomass allocation, root biomass allocation and crown-root ratio. branch biomass allocation, leaf biomass allocation of Phoebe bournei in canopy gap were significantly higher than those in understory habitat, showed a strong phenotypic plasticity. In the appropriate understory habitats, P. bournei plantations were rapid resource acquisition, including increased leaf and branch biomass allocation ratio. Otherwise, P. bournei plantations reduced leaf and branch biomass allocation ratio, adopted a conservative consumed strategies.