沿海平原南方型杨树生长特性*

连续3a的试验研究表明:南方型杨树在宁波沿海平原地区的年生长可分为4个时期，即生长前期、速生期Ⅰ、速生期Ⅱ和生长后期。生长过程能较好地用Richards生长曲线拟合。树高、胸径和材积的速生期分别在2~6a，3~7a和4~9a。土壤含盐量对杨树生长有抑制作用，但与其他平原树种相比仍表现出显著的速生特性。与我国南方型杨树引种区生长比较，宁波市沿海平原属适宜引种区。

Gorwth Characteristics of Southern Type Poplars in Coastal Plain of Ningbo.

Three years continuous study indicated that anuual growth process of southern type poplars in coastal plain, Ningbo, Zhejiang, could be divided into four stages: early growing stage, fast growing stage Ⅰ, fastgrowing stageⅡand late growing stage, and could be fit by Rechards function. The fast growing periods of height, DBH and volume appeared at 2~6, 3~7 and 4~9 years old respectively. The growth of the tree was restrained by the saIt content of soil, but it still growed faster than other species in the same site. The coastal plain in Ningbo is a favourable area for its intruduction.