樟子松种群自疏规律为：平均胸径与密度的关系符合负幂函数模型。
Regulation of self- thinning is that relationship between DBH and average density of population accords with negative power function.
模型优化结果表明：在所有参与模拟的树冠生长的阶跃模型中，以幂函数模型为最优。
The optimizing model results show that the power model is the best one in all models tested.
用幂函数模型描述的回归曲线以及根据试验参数得到模拟曲线与试验值比较误差均较小。
The errors of the data obtained using the power function model are very small from the test data.
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