美洲黑杨新无性系苗期年生长规律研究

以5个黑杨派(P.deltoides)杨树无性系为材料,利用Logistic方程对各个无性系的1a生扦插苗木的苗高、地径的年生长节律进行拟合。根据因素数列的几何形状发展态势的接近程度,将苗木的生长量与影响苗木生长的气象因子空气温度、空气相对湿度、降水量和日照时数组成1个灰色系统,进行面积关联度分析。结果表明:利用Logistic方程拟合效果显著,相关系数皆在0.95以上。关联度分析表明降水量对苗木的高生长影响最大,日照时数影响最小;而日照时数对苗木的粗生长影响较大,降水量影响最小。

Study on Annual Growth Rules for New Clones of Populus Deltoides at Seedling Stage

Logistic equation is applied to fit annual growth rhythm in seedling height and ground diameter for one—year old cutting seedling from 5 clones of P. deltoides. According to degree closeness of development trend in geometrical shape of factorial sequence,analysis was carried out on area correlation degree by constituing one grey system from seedling increment,and climatic factors influencing seedling growth such as air temperature, relative humidity, rainfall and illuminating hours. The results show that the effect from fitting with logistic equation is significant,with all above 0.95 of correlation coefficient. Analysis on correlation degree shows that rainfall is believed to have the most significant influence on the height growth and the least influence on illumination hours, while illumination hours have relatively more significant influence on the thick growth of the seedling,but precipitation is the least.