DEFINING LEAF-AREA INDEX FOR NON-FLAT LEAVES
DEFINING LEAF-AREA INDEX FOR NON-FLAT LEAVES
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DOI：
10.1111/j.1365-3040.1992.tb00992.x
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发表时间：
1992-05-01
影响因子：
7.3
通讯作者：
BLACK, TA
中科院分区：
文献类型：
--
作者：
CHEN, JM;BLACK, TA
为了消除L(音译)对非平坦叶片叶面积指数定义的混乱，通过对一系列椭球形角分布的数学推导和数值计算，研究了球体、圆柱体、半圆柱体、三角形和方棒等几种物体的投影系数。结果表明，当目标的倾角呈随机(球状)分布时，根据总截获面积的一半计算的投影系数接近于一个常数0.5，而根据目标的最大投影面积计算的结果强烈依赖于目标的形状。因此，建议将非平坦叶的叶面积指数定义为单位地表面积总截留面积的一半，放弃L根据叶面积推算的定义。
To eliminate the confusion in the definition of leaf area index (L) for non-flat leaves, the projection coefficients of several objects including spheres, cylinders, hemicircular cylinders, and triangular and square bars are investigated through mathematical derivation and numerical calculation for a range of ellipsoidal angular distributions. It is shown that the projection coefficient calculated based on half the total intercepting area is close to a constant of 0.5 when the inclination angle of the objects is randomly (spherically) distributed, whereas the calculated results based on the object's largest projected area are strongly dependent on the shape of the objects. Therefore, it is suggested that the leaf area index of non-flat leaves be defined as half the total intercepting area per unit ground surface area and that the definition of L based on the projected leaf area be abandoned.