The utility of Leap function in the crown growth process with changing point is better than the usual regression methods , and the Monadic power model is the best one.

• 阶跃函数模型在具有变点的桉树林分树冠生长过程中的应用优于一般回归拟合模型效果，而且以 阶跃幂函数模型为最佳。