The Effect of Epidermal Structures on Leaf Spectral Signatures of Ice Plants (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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2015-12-01
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| Series: | Remote Sensing |
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| Online Access: | http://www.mdpi.com/2072-4292/7/12/15862 |
| _version_ | 1798031652390174720 |
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| author | René Hans-Jürgen Heim Norbert Jürgens André Große-Stoltenberg Jens Oldeland |
| author_facet | René Hans-Jürgen Heim Norbert Jürgens André Große-Stoltenberg Jens Oldeland |
| author_sort | René Hans-Jürgen Heim |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T19:59:53Z |
| format | Article |
| id | doaj.art-172f7bfc9fec41f98ecbf57a3fbaba90 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-04-11T19:59:53Z |
| publishDate | 2015-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-172f7bfc9fec41f98ecbf57a3fbaba902022-12-22T04:05:38ZengMDPI AGRemote Sensing2072-42922015-12-01712169011691410.3390/rs71215862rs71215862The Effect of Epidermal Structures on Leaf Spectral Signatures of Ice Plants (Aizoaceae)René Hans-Jürgen Heim0Norbert Jürgens1André Große-Stoltenberg2Jens Oldeland3Biodiversity Ecology and Evolution of Plants, Biocenter Klein Flottbek and Botanical Garden, University of Hamburg, Ohnhorststraße, Hamburg 18 22609, GermanyBiodiversity Ecology and Evolution of Plants, Biocenter Klein Flottbek and Botanical Garden, University of Hamburg, Ohnhorststraße, Hamburg 18 22609, GermanyInstitute of Landscape Ecology, Heisenbergstraße, Münster 2 48149, GermanyBiodiversity Ecology and Evolution of Plants, Biocenter Klein Flottbek and Botanical Garden, University of Hamburg, Ohnhorststraße, Hamburg 18 22609, GermanyEpidermal 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.http://www.mdpi.com/2072-4292/7/12/15862Aizoaceaebiophysical propertiesleaf epidermisfield spectrometryhyperspectral classificationleaf traitsoptical typesplant functional typessucculent plants |
| spellingShingle | René Hans-Jürgen Heim Norbert Jürgens André Große-Stoltenberg Jens Oldeland The Effect of Epidermal Structures on Leaf Spectral Signatures of Ice Plants (Aizoaceae) Remote Sensing Aizoaceae biophysical properties leaf epidermis field spectrometry hyperspectral classification leaf traits optical types plant functional types succulent plants |
| title | The Effect of Epidermal Structures on Leaf Spectral Signatures of Ice Plants (Aizoaceae) |
| title_full | The Effect of Epidermal Structures on Leaf Spectral Signatures of Ice Plants (Aizoaceae) |
| title_fullStr | The Effect of Epidermal Structures on Leaf Spectral Signatures of Ice Plants (Aizoaceae) |
| title_full_unstemmed | The Effect of Epidermal Structures on Leaf Spectral Signatures of Ice Plants (Aizoaceae) |
| title_short | The Effect of Epidermal Structures on Leaf Spectral Signatures of Ice Plants (Aizoaceae) |
| title_sort | effect of epidermal structures on leaf spectral signatures of ice plants aizoaceae |
| topic | Aizoaceae biophysical properties leaf epidermis field spectrometry hyperspectral classification leaf traits optical types plant functional types succulent plants |
| url | http://www.mdpi.com/2072-4292/7/12/15862 |
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