FluorMODleaf: A new leaf fluorescence emission model based on the PROSPECT model
FluorMODleaf: A new leaf fluorescence emission model based on the PROSPECT model
复制标题
DOI：
10.1016/j.rse.2009.08.019
复制
发表时间：
2010-01
影响因子：
13.5
通讯作者：
R. Pedrós;Y. Goulas;S. Jacquemoud;J. Louis;I. Moya
中科院分区：
文献类型：
--
作者：
R. Pedrós;Y. Goulas;S. Jacquemoud;J. Louis;I. Moya
提出了一种新的植物叶片叶绿素a荧光发射模型--荧光叶模型。这是一种广泛使用的树叶光学性质模型，它将树叶视为一堆N吸收和扩散的基本板，是对PROSPECT的扩展。在FluorMODLeaf中，厚度为DX的无限小层的荧光发射被积分到整个基本板上。荧光源函数基于稀释类囊体的激发光谱和独立光系统的发射光谱，PSI和PSII是参与光合作用初始阶段的主要色素-蛋白质复合体。叶片内的散射是由基本板内部和之间的多次反射产生的。σ-5的输入变量是：基板数N，也称为叶片结构参数，总叶绿素含量Cab，总类胡萝卜素含量Ccx，当量水厚度Cw，干物质含量Cm(或单位面积叶质量)，加上参考PSi和PSII的相对吸收截面的PsI/σIatio，以及作为平均荧光寿命的PsI和τIi和τII的荧光量子效率。该模型考虑了叶片内发射光的再吸收，可以很好地定量估计在400~700 nm不同激发波长下向上和向下的表观光谱荧光产额(ASFY)。它还强调了散射在具有高叶绿素含量的叶片的荧光发射中的作用。
A new model of chlorophyll a fluorescence emission by plant leaves, FluorMODleaf, is presented. It is an extension of PROSPECT, a widely used leaf optical properties model that regards the leaf as a pile of N absorbing and diffusing elementary plates. In FluorMODleaf, fluorescence emission of an infinitesimal layer of thickness dx is integrated over the entire elementary plate. The fluorescence source function is based on the excitation spectrum of diluted isolated thylakoids and on the emission spectra of isolated photosystems, PSI and PSII, which are the main pigment–protein complexes involved in the initial stages of photosynthesis. Scattering within the leaf is produced by multiple reflections within and between elementary plates. The input variables of FluorMODleaf are: the number of elementary plates N, also called leaf structure parameter, the total chlorophyll content Cab, the total carotenoid content Ccx, the equivalent water thickness Cw, and the dry matter content Cm(or leaf mass per area), as in the new PROSPECT-5, plus the σII/σIratio referring to the relative absorption cross section of PSI and PSII, and the fluorescence quantum efficiency of PSI and PSII, τIand τII, that are introduced here as mean fluorescence lifetimes. The model, which considers the reabsorption of emitted light within the leaf, allows good quantitative estimation of both upward and downward apparent spectral fluorescence yield (ASFY) at different excitation wavelengths from 400nm to 700nm. It also emphasizes the role of scattering in fluorescence emission by leaves having high chlorophyll content.