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本文采用插条育秧移栽的方法研完了毛白杨1、2年生苗木的适宜密度。在一定范围内密度与平均苗高和直径的生长呈负相关;只有在适宜的密度下单位面积上干物质积累量才最高。在年周期中测定了苗木叶面积的消长,据此分析了不同密度下苗木个体间相互关系的变化。文章提出培育一年生毛白杨苗木的适宜密度是每亩2600—3900株,培育二年生苗木的适宜密度是每亩1300—2600株。在肥沃的土壤上密度应取下限,在肥力较低的土壤上密度可取上限。
In this paper, cuttings transplanting method research finished Populus tomentosa 1, 2-year-old seedlings of the appropriate density. Within a certain range of densities, there is a negative correlation between the density and the average growth of seedling height and diameter; the dry matter accumulation per unit area is the highest under suitable densities. The growth and decline of the seedling leaf area were measured in the annual cycle. Based on this, the changes of the relationship among seedlings and seedlings under different densities were analyzed. The article puts forward that the appropriate density for cultivating annual young Populus tomentosa seedlings is 2600-3900 plants per acre and the suitable density for growing biennial seedlings is 1300-2600 acre per acre. In fertile soil density should take the lower limit, in the lower fertility of the soil densities upper limit.