一、引言松树在形态解剖上都具有旱生结构的特征,因此人们往往忽视了它对水分条件的要求。其实松属各种间对水分的要求有很大差异。种植松树时因忽视水分条件而遭受失败的例子不少。例如近年来我国南方各地引种冬雨型地区的意大利松Pinus pinea、南欧海松P.pinastes等,第一年育苗时生长旺盛,到第二年夏季就生长不良或发病死去,吴中伦分析我国马尾松分布区时,就曾指出 I. INTRODUCTION The pine tree has the characteristic of xerophytic structure both in morphology and anatomy, so people often neglect its requirement of moisture condition. In fact, all kinds of pine between the water requirements are very different. There are quite a few examples of unsuccessful pine tree planting due to neglect of water conditions. For example, Pinus pinea, Pinus pinea introduced in the winter rainy region in southern China in recent years, P. pinastes, etc., grow vigorously in the first year of seedling growth, and then grow poorly or die in the following summer. Wu Zhonglun analyzed the distribution of Pinus massoniana District, it was pointed out