文献类型： 外文期刊

第一作者： LIANG Shou-zhen

作者： LIANG Shou-zhen;SUI Xue-yan;WANG Meng;WANG Fei;HAN Dong-rui;WANG Guo-liang;LI Hong-zhong;MA Wan-dong

作者机构：

关键词： Anthocyanin; Sensitivity analysis; Radiative transfer model; Remote sensing

期刊名称：SPECTROSCOPY AND SPECTRAL ANALYSIS （ 影响因子：0.7； 五年影响因子：0.6 ）

ISSN： 1000-0593

年卷期： 2024 年 44 卷 1 期

页码：

收录情况： SCI

摘要： Anthocyanin (Anth) is the third major group of leaf pigments. It can provide valuable information about plant physiology, and the information on the dynamics of their concentrations is a key to understand plants' the physiological reaction and resistance to different environmental stress factors brought about by episodic events or seasonal fluctuations. Traditionally, pigments are extracted from vegetation with spectrophotometry or high-pressure liquid chromatography, which are destructive and do not permit repeated measurements on the same samples. Optical methods monitoring plant physiological status through measuring leaf optical properties (absorbance or reflectance) possess several advantages over traditional destructive methods. However, there is a lack of research on the inversion of Anth through optical methods. Overlapping features in the specific absorption coefficient of pigments makes retrieving Anth content through remote sensing challenging. Understanding the relationship between Anth and leaf optical properties is necessary and helpful to estimate Anth content from leaves. This research used PROSPECT-D, a radiative transfer model including Anth parameter, to construct leaf spectral data in different parameter conditions. The global sensitivity analysis was conducted to quantify the influence of Anth on leaf optical properties through the modified Sobol method. we aimed to find sensitive Anth bands and calculate spectral indices relating to Anth content. Furthermore, inversing strategies based on hyperspectral narrow wavebands and spectral indices, including the Anthocyanin Reflectance Index (ARI) and modified Anthocyanin Reflectance Index (mARI), were discussed. The results showed that: (1) Anth can influence leaf optical properties in the 400 similar to 689 nm range, and leaf reflectance decreased in the visible band when Anth concentration increased. (2) The leaf reflectance in 467 similar to 589 nm was sensitive to the dynamics of Anth concentrations. There was the highest total sensitivity index of Anth at 509 nm. Chlorophyll and carotenoid had an impact on leaf reflectance in 467 similar to 589 nm. According to total sensitivity indices of chlorophyll and carotenoid, three spectral regions can be formed: 467 similar to 505 nm (influenced by carotenoids, chorophylls and Anth), 506 similar to 541 nm (influenced by Anth and carotenoids), 542 similar to 589 nm (influenced by chorophylls and Anth). (3) Anth concentration correlated best with leaf reflectance at 560 nm. Because of the pigments' overlapping absorption features, including chorophylls and carotenoids, Anth had better relationship with spectral indices than reflectance in individual narrow wavebands. Spectral indices partly removed other plant pigments' influence on plant leaf reflectance. Consequently, they can describe the dynamics of Anth concentrations accurately. This research will provide a theory method for remote sensing estimation of Anth content at the leaf scale.

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