油松人工林根系生物量的研究

在油松人工林中设置标准地，分别径阶选定样木，测定根径大于１厘米的根系生物量，用土柱法测定根径小于１厘米的根系生物量。结果表明，３５年生人工林每公顷根系生物量占林木总生物量的１４．３２％，根系生物量与林木径阶的变化有极显著的相关性，根径小于１厘米的根系集中分布于０－２０厘米的土层中。

STUDY ON THE ROOT BIOMASS OF PINUS TABULAEFORMIS CARR

Setting up standard field in 35 years old standing forest of Pinus tabulaeformis Carr., in every diameter group we select sample trees and measure the roots(thicker than 1cm) biomass. the biomass of roots (thinner than 1cm) is measured by means of the so-called earth-column-method. Results show that for the 35-year-old Pinus tabulaeformis Carr., roots biomass of every hectare makes up 14.32 percent of the total tree biomass. There is a very significant relation between root biomass and the change of tree diameter. The roots (thinner than 1cm) are distributed mainly in the soil layer of 0-20cm.