A_(15)(小黑×波)等十个杨树新品系生长规律的研究

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。

A STUDA ON GROWTH LAW OF 10 POPLAR NEW STRAINS

Growth of height and diameter of A_(15) and other poplar new strains are synchroulsm with periodic rhythm of growth seasons. During the test-growing period, Most of the popular new strains have a peak value of growth. Regression analysis with temperature, precipitation, and sunshine-hours of which is an important factor and it affects the growth of height and diameter in test area. For the most new strains the height grow fast from the third year, and the Peak value is about the sixth year. The diameter grows fast from the second year and the peak valae is also about the sixth year. However, the volume growth increases annually and the peak value is also about the sixth year, In range of age, all of the annual increment of volume is larger than average that the quantitive maturity does not reach of each poplar new strains.