摘要： <正>本文将树木的冠形概括成三种基本几何形体:圆锥体、圆球体、圆柱体,应用投影几何原理研究了上述基本冠形在地面的影子形状,推导了影子面积的计算公式。文中还从气象学的角度对树冠影子的形状、位移作了较详细的讨论。

Abstract: In the study, tree crowns are grouped into three types: Conical, Spherical, and Cylindrical shape. Shadow forms on the ground of different crown shapes are studied on the principles of projective geometry, and formulae for shadow areas are developed. In addition, the change of shadow forms and its movement orbits are also discussed in detail.