DOI: 10.1016/j.jag.2015.01.010
Scopus记录号: 2-s2.0-84927617232
论文题名: Plant phenolics and absorption features in vegetation reflectance spectra near 1.66 μm
作者: Kokaly R ; F ; , Skidmore A ; K
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2015
卷: 43 起始页码: 55
结束页码: 83
语种: 英语
英文关键词: Canopy chemistry
; Continuum removal
; Polyphenols
; Remote sensing
; Spectral feature analysis
; Spectroscopy
; Tannin
Scopus关键词: absorption
; canopy reflectance
; phenolic compound
; plant
; plant-herbivore interaction
; plant-insect interaction
; remote sensing
; tannin
; vegetation cover
; Acer rubrum
; Acer saccharum
; Arctostaphylos
; Artemisia tridentata
; Hexapoda
; Rhus
英文摘要: Past laboratory and field studies have quantified phenolic substances in vegetative matter from reflectance measurements for understanding plant response to herbivores and insect predation. Past remote sensing studies on phenolics have evaluated crop quality and vegetation patterns caused by bedrock geology and associated variations in soil geochemistry. We examined spectra of pure phenolic compounds, common plant biochemical constituents, dry leaves, fresh leaves, and plant canopies for direct evidence of absorption features attributable to plant phenolics. Using spectral feature analysis with continuum removal, we observed that a narrow feature at 1.66 μm is persistent in spectra of manzanita, sumac, red maple, sugar maple, tea, and other species. This feature was consistent with absorption caused by aromatic C H bonds in the chemical structure of phenolic compounds and non-hydroxylated aromatics. Because of overlapping absorption by water, the feature was weaker in fresh leaf and canopy spectra compared to dry leaf measurements. Simple linear regressions of feature depth and feature area with polyphenol concentration in tea resulted in high correlations and low errors (% phenol by dry weight) at the dry leaf(r2 = 0.95, RMSE = 1.0%, n = 56), fresh leaf(r2 = 0.79, RMSE = 2.1%, n = 56), and canopy (r2 = 0.78, RMSE = 1.0%, n = 13) levels of measurement. Spectra of leaves, needles, and canopies of big sagebrush and evergreens exhibited a weak absorption feature centered near 1.63 μm, short ward of the phenolic compounds, possibly consistent with terpenes. This study demonstrates that subtle variation in vegetation spectra in the shortwave infrared can directly indicate biochemical constituents and be used to quantify them. Phenolics are of lesser abundance compared to the major plant constituents but, nonetheless, have important plant functions and ecological significance. Additional research is needed to advance our understanding of the spectral influences of plant phenolics and terpenes relative to dominant leaf biochemistry (water, chlorophyll, protein/nitrogen, cellulose, and lignin). © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79560
Appears in Collections: 气候变化事实与影响
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作者单位: U.S Geological Survey (USGS), Denver Federal Center, MS 973 Box 25046, Denver, CO, United States; Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, P.O. Box 217, Enschede, Netherlands
Recommended Citation:
Kokaly R,F,, Skidmore A,et al. Plant phenolics and absorption features in vegetation reflectance spectra near 1.66 μm[J]. International Journal of Applied Earth Observation and Geoinformation,2015-01-01,43