Application of a Three-Dimensional Radiative Transfer Model to Retrieve the Species Composition of a Mixed Forest Stand from Canopy Reflected Radiation
Application of a Three-Dimensional Radiative Transfer Model to Retrieve the Species Composition of a Mixed Forest Stand from Canopy Reflected Radiation
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DOI：
10.3390/rs10101661
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发表时间：
2018-10
期刊：
影响因子：
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通讯作者：
N. Levashova;D. Lukyanenko;Yulia Mukhartova;A. Olchev
中科院分区：
文献类型：
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作者：
N. Levashova;D. Lukyanenko;Yulia Mukhartova;A. Olchev
本文介绍了一种三维模型，用于导出具有多物种结构的不均匀森林冠层反射和吸收的光合有效辐射（PAR）的空间模式，以及一种模型算法应用程序，用于从沿林分上方某些轨迹测量的反射 PAR 中检索森林冠层组成。该辐射传输模型基于稳态传输方程，最初由 Ross 提出，并将辐射传输视为单个树木和森林冠层的结构、不同树种的光合作用和非光合作用部分的光学特性、土壤反射以及传入的直接太阳辐射和漫射太阳辐射的比率的函数。数值实验表明，由针叶树和落叶树种组成的典型混交林的反射太阳辐射受冠层结构、土壤性质和太阳高度的强烈控制。基于所开发模型的建议算法允许从测量的树冠反射系数中检索混合林中不同树种的比例。该方法的精度严格取决于冠层反射测量的点数。
The paper introduces a three-dimensional model to derive the spatial patterns of photosynthetically active radiation (PAR) reflected and absorbed by a non-uniform forest canopy with a multi-species structure, as well as a model algorithm application to retrieve forest canopy composition from reflected PAR measured along some trajectory above the forest stand. This radiative transfer model is based on steady-state transport equations, initially suggested by Ross, and considers the radiative transfer as a function of the structure of individual trees and forest canopy, optical properties of photosynthesizing and non-photosynthesizing parts of the different tree species, soil reflection, and the ratio of incoming direct and diffuse solar radiation. Numerical experiments showed that reflected solar radiation of a typical mixed forest stand consisting of coniferous and deciduous tree species was strongly governed by canopy structure, soil properties and sun elevation. The suggested algorithm based on the developed model allows for retrieving the proportion of different tree species in a mixed forest stand from measured canopy reflection coefficients. The method accuracy strictly depends on the number of points for canopy reflection measurements.