毛白杨育苗密度的研究

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。

A STUDY ON DENSITY OF STOCKS OF POPULUS TOMENTOSA RAISED IN NURSERY

The appropriate density of raising stocks of Populus tomen-tosa has been studied. Within a certain range of density,the average height and diameter of raising stock are negatively correlated with the density. At the appropriate density the raising stocks obtained the highest dry mater yield. The leaf area index, has been messured in a period of year, its fluctuation shows the interrelation among the plants of different density. An appropriate density is 2600-3900 saplings per mu (667m2) for one year old stocks and 1300-2600 saplings per mu for two years old stocks. on the fertile soil the lower part of density range should be used, and on the infertile soil the upper part of density range should be used.