The Effect of Epidermal Structures on Leaf Spectral Signatures of Ice Plants (Aizoaceae)
The Effect of Epidermal Structures on Leaf Spectral Signatures of Ice Plants (Aizoaceae)
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DOI：
10.3390/rs71215862
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发表时间：
2015-12-01
期刊：
影响因子：
5
通讯作者：
Oldeland, Jens
中科院分区：
文献类型：
--
作者：
Heim, Rene Hans-Juergen;Juergens, Norbert;Oldeland, Jens
已知叶的表皮结构（ES）影响功能性质和光谱响应。光谱研究主要集中在头发或蜡层的影响。我们研究了更广泛的不同ES及其对光谱特性的影响。此外，我们确定了光谱区域，可以区分不同的ES。我们使用了一个现场光谱仪测量离体叶片光谱响应从350 nm-2500 nm。建立了番木鳖科25种肉质植物的光谱库。根据ES将其划分为五种功能类型：扁平表皮细胞表面、凸起至乳头状表皮细胞表面、膀胱细胞、毛发和蜡覆盖。我们使用偏最小二乘判别分析（PLS-DA）的光谱数据的基础上测试的ES的可分性。随后，计算变量重要性（VIP），以确定与区分我们的功能类型（类）相关的光谱区域。分类性能很高，Kappa值为0.9，表明可分离的光谱类别。VIP计算确定了六个光谱区域的重要性增加的分类。我们证实并扩展了先前关于可见-近红外光谱区域的发现。我们的实验还证实，表皮叶性状可以进行分类，由于明确区分的光谱特征，跨物种和属内的Aizoaceae。
Epidermal structures (ES) of leaves are known to affect the functional properties and spectral responses. Spectral studies focused mostly on the effect of hairs or wax layers only. We studied a wider range of different ES and their impact on spectral properties. Additionally, we identified spectral regions that allow distinguishing different ES. We used a field spectrometer to measure ex situ leaf spectral responses from 350 nm-2500 nm. A spectral library for 25 species of the succulent family Aizoaceae was assembled. Five functional types were defined based on ES: flat epidermal cell surface, convex to papillary epidermal cell surface, bladder cells, hairs and wax cover. We tested the separability of ES using partial least squares discriminant analysis (PLS-DA) based on the spectral data. Subsequently, variable importance (VIP) was calculated to identify spectral regions relevant for discriminating our functional types (classes). Classification performance was high, with a kappa value of 0.9 indicating well-separable spectral classes. VIP calculations identified six spectral regions of increased importance for the classification. We confirmed and extended previous findings regarding the visible-near-infrared spectral region. Our experiments also confirmed that epidermal leaf traits can be classified due to clearly distinguishable spectral signatures across species and genera within the Aizoaceae.