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该项研究是佳木斯市林科所于1981—1987年在黑龙江省桦南县开展的。经过观察分析,A_(15)(小黑×波)等十个杨树新品系的树高、胸径年生长季节周期性节律是同步的,大部分品系的速生期具有一个生长高峰。其生长与气温、降水、日照时数的回归分析表明,日照时数是影响树高、胸径生长的重要因子。A_(15)等十个杨树新品系的大部分树高生长从第三年开始加速,第六年左右出现高峰;胸径生长从第二年开始加速,第六年左右出现高峰,而材积生长是逐年增加的,其高峰也在第六年出现。在研究涉及的时间范围内,材积连年生长量始终大于平均生长量,说明各品系的数量成熟龄尚未到来。
The study was conducted by Linke Jiamusi in Huanan County, Heilongjiang Province from 1981 to 1987. After observation and analysis, ten tree poplars such as A_ (15) (black × wave) have synchronized annual seasonal rhythms of annual growth, and most of the strains have a growth peak at the fast-growing stage. Regression analysis of growth and temperature, precipitation and sunshine duration showed that sunshine duration was an important factor affecting tree height and DBH growth. Most of the new poplar trees such as A_ (15) accelerated their tree height growth from the third year and peaked around the sixth year. The DBH growth accelerated from the second year and peaked at the sixth year, while the volume growth was year by year Increase, its peak also appeared in the sixth year. Within the time frame of the study, the annual growth volume of the product is always greater than the average growth, indicating that the number of mature lines of each line has not yet come.