摘要
以数值求解的方法建立单株树下的辐射分布模型。模型给出不同纬度、不同坡向、不同树形几何参数、不同树下的平面位置和不同时刻的辐射强度。由此编制了标准的Ｃ 和ＦＯＲ－ＴＲＡＮ 数值函数Ｉ＝ ｆ（ψ，α，Ｓ，Ａ，Ｈｂ，Ｈｃ，Ｒｏ，Ｘ，Ｙ，ｔ）。以新疆和田地区的核桃树下所测得的辐射数据进行拟合运算的结果说明，模型能较好的描述单株树下的实际辐射分布。最后，对树下的平均辐射的全年变化的分析表明，对树冠形状近于锥体的单株树，当树高和冠幅为定值时。
A numerical model was developed to model the radiation distribution under an indivi dual tree crown with different tree geometric parameters,different geographical locations and different topographical parameterrs and different transmissivity of the tree crown.The model was encoded into C and FORTRAN functions and could be utilized in agroforestry ecosystem modeling.The analysis showed that when the tree crown was more or less a conical shape with fixed tree height and crown radius,an increase in crown volume could even increase the average radiation under the tree.
基金
国家自然科学基金
关键词
农林复合生态系
林间辐射
数值模型
Agroforestry ecosystem
Radiation under tree
Numerical models
