基于辐射传输模型的叶片含水量定量反演研究  

Quantitative Inversion of Leaf Water Content Based on Radiation Transfer Model

作　　者：曾凡超 赵静 王英修 姚付启[1] ZENG Fanchao;ZHAO Jing;WANG Yingxiu;YAO Fuqi(School of Hydraulic Engineering,Ludong University,Yantai 264039,China;Yangtze River Water Resources Commission Yangtze River Academy of Sciences,Wuhan 430012,China)

机构地区：[1]鲁东大学水利工程学院,山东烟台264039 [2]长江水利委员会长江科学院,武汉430012

出　　处：《鲁东大学学报（自然科学版）》2023年第3期251-257,共7页Journal of Ludong University:Natural Science Edition

基　　金：山东省自然科学基金(ZR2020ME254,ZR2020QDO61)。

摘　　要：为了快速、准确地估测出植物的叶片含水量,为研究植物生长发育状况提供数据支持,本研究通过叶片内部辐射传输机制的PROSPECT模型模拟出大量不同生化含量和叶肉结构的叶片光谱反射率,深入探讨有效反演叶片含水量的植被水分指数,并对各指数的稳定性和抗干扰能力进行评估。结果显示,各植被水分指数对叶片含水量的敏感性差异不大,除水应力指数(moisture stress index, MSI)和归一化多波段干旱指数(normalized multi-band drought index, NMDI)两种指数外,其他指数值均随叶片含水量的增加而增加。叶绿素含量的差异对各植被水分指数的影响较小,干物质次之,叶肉结构影响最大。在抵抗干物质影响和叶肉结构影响方面,水分指数(water index, WI)相比其他11种指数来说具有较大优势,简单水比指数(simple ratio water index, SRWI)次之。通过使用叶片光学模型的模拟光谱来研究叶片含水量变化的光谱响应及其影响因素,具有较强的理论性和普适性,是研究植物生长发育状况的一种重要手段。In order to quickly and accurately estimate the leaf water content of plants and provide data support for studying the growth and development status of plants,this study simulated a large number of leaf spectral reflectance with different biochemical contents and mesophyll structures through the PROSPECT model of the internal radiation transmission mechanism of leaves,deeply explored the effective vegetation water index for in-verting leaf water content,and evaluated the stability and anti-interference ability of each index.The results showed that there was no significant difference in the sensitivity of various vegetation moisture indices to leaf moisture content.Except for the moisture stress index(MSI)and normalized multiband drought index(NMDI),all other indices increased with the increase of leaf moisture content.The difference in chlorophyll content has a smaller impact on the water index of each vegetation,followed by dry matter,and the mesophyll structure has the greatest impact.In terms of resistance to the effects of dry matter and mesophyll structure,the water index(WI)has a significant advantage over the other 11 indices,followed by the simple water ratio index(SRWI).Studying the spectral response and influencing factors of leaf water content changes through the use of simulated spectra of leaf optical models has strong theoretical and universal applicability,and is an important means of studying plant growth and development status.

关 键 词：辐射传输模型 叶片含水量 高光谱 植被水分指数 反演 

分 类 号：S127[农业科学—农业基础科学]