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最近,日本王子造纸公司林木育种研究所进行的“密植银白杨快速收获”法能使单位面积木材的产量提高一倍,而且成材的时间只需两年。方法和过程大致如下: 在耕耘平整的土地上,栽植如铅笔粗细大小的银白杨树苗,株距二十至四十厘米,行距七十至一百厘米。从每公倾试验田栽植的密度,分四万、六万和八万株三类。植树的季节为春季。
Recently, the “close planting of Populus alba fast harvesting” by the Prince Plantations Research Institute in Japan’s Princes Paper Company has doubled the production of timber per unit area, and it took only two years to materialize. The method and process are as follows: On cultivated land, silver poplar seedlings, planted in pencil size, are planted at intervals of twenty to forty centimeters and seventy to one hundred centimeters. The density of cultivation from each test field, divided into 40,000, 60,000 and 80,000 strains of three categories. The season of planting trees is spring.