桢楠种源幼苗细根形态和生物量研究

Fine Root Morphology and Biomass of Phoebe zhennan Provenance Seedlings

摘要:

为了解桢楠(Phoebe zhennan)不同种源细根形态和生物量分配的差异,采用全根调查的方法,对桢楠自然分布区13个种源2.5年生幼苗的细根形态和生物量进行了研究。结果表明,桢楠种源间各级细根的平均直径、总根长和表面积差异显著,在种源内细根的平均直径随根序的增加而增加,但根序间总根长和表面积差异规律不明显。根序生物量分配随根序增加而增加,1~4级根生物量分配分别为6.33%、14.47%、25.03%和54.17%。通过综合评价,以HT、LF、ES和WC种源的根系最优,具有较高的生长潜力。

Abstract:

In order to understand the differences of fine root morphology and biomass allocation among different provenances of Phoebe zhennan, the fine root morphology and biomass of 2.5-year-old seedlings of 13 provenances in natural distribution areas were studied by root investigation method. The results showed that the average diameter, total root length and surface area of fine roots among P. zhennan provenances were different significantly, with root order increased the average diameter of fine roots enlarged within provenances, but the difference of total root length and surface area between root orders was not obvious. Allocation of biomass enhanced as root order increased, which from 1- to 4- grade-root accounting for 6.33%, 14.47%, 25.03% and 54.17%, respectively. Through comprehensive evaluation, the root system of HT, LF, ES and WC provenances were optimized with high growth potential.