河北省最近拟订了从1965～1970年的全省公路绿化规划,规划内容针五年内专业养护路线植乔木833.8万株,矮林4603.8万墩;群众养护路线植乔木1163.9万株,矮林2241.7万墩。经过五年的发展,在专业养护和群众养护的路线上实现基本绿化,并基本上能达到以树养树,绿化经费自给自足。其具体安排如下: 一、公路绿化的规格要求 1.专业道班养护路线。要求公路两侧有两行乔木,作为基本绿化目标,株距一般为3～4米。1970年以后,对一些现有老龄林木开始逐步更新(有些路段,因需要而营造的防护林带,均不包括在规划内)。 Hebei province recently formulated a provincial highway greening plan from 1965 to 1970. The planning contents include 8,338,000 trees and 4,838,800,000 dwarf trees in the five-year professional conservation route. Eleven,963,000 trees were planted by masses and 22,417,000 Pier. After five years of development, basic greening has been achieved on the line of professional conservation and mass conservation and can basically be self-sufficient in tree-raising and afforestation funds. The specific arrangements are as follows: First, the specifications of highway greening 1. Professional road classes conservation line. Requires two rows of trees on both sides of the road, as the basic goal of afforestation, plant spacing is generally 3 to 4 meters. After 1970, some existing aged trees are gradually being updated (some sections of shelter belt due to need are not included in the plan).