DOI: 10.1016/j.jag.2013.09.011
Scopus记录号: 2-s2.0-84897476008
论文题名: Detecting leaf-water content in Mediterranean trees using high-resolution spectrometry
作者: de Jong S ; M ; , Addink E ; A ; , Doelman J ; C
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2014
卷: 27, 期: PARTB 起始页码: 128
结束页码: 136
语种: 英语
英文关键词: Equivalent water thickness (EWT)
; Field experiment
; Lithological substrates
; Spectral leaf-water indices
Scopus关键词: canopy
; environmental conditions
; leaf
; leaf area index
; lithology
; sensitivity analysis
; spectrometry
; substrate
; tree
; water availability
; water content
; France
; Mediterranean Region
英文摘要: Water content of the vegetation canopy or individual leaves is an important variable in physiological plant processes. In Mediterranean regions where water availability is an important production limiting factor, it is a strong indicator of vegetation stress. Spectroscopic earth-observation techniques in the solar part of the electromagnetic spectrum provide opportunities to determine leaf and canopy-water content dueto the presence of water-absorption bands around 970 and 1200 nm. We investigated the possibilities to predict leaf-water content of three dominant tree species in a study area in Mediterranean Franceusing spectral indices. During a field campaign leaf-water content (EWT) was determined and high-resolution spectra were measured of the same leaves. The spectra were measured in two ways: using anoptical cable with a field of view of 25{ring operator}and using a leaf clip with its own artificial illumination source. The spectra were analyzed and related to leaf-water content as original reflectance spectra and as continuum-removed spectra using eight spectral leaf-water indices. Next, reflectance spectra were simulated to explore their sensitivity to environmental conditions like leaf area index and illumination angle using aradiative transfer model. Results show that a good correlation (0.70) exists between leaf-water content and spectral indices using the right slope of the 970 nm water-absorption band. Continuum-removal correction of the spectra improved the relations. The model sensitivity analysis illustrated that from aset of five environmental variables leaf area index has, as may be expected, an important impact on leaf-water estimates. This field and model study illustrates that it is feasible to determine foliar water contenton the basis of spectral indices located around the minor water-absorption bands with a limited effect of environmental conditions. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79666
Appears in Collections: 气候变化事实与影响
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作者单位: Faculty of Geosciences, Utrecht University, P.O. Box 80.115, NL-3508 TC Utrecht, Netherlands
Recommended Citation:
de Jong S,M,, Addink E,et al. Detecting leaf-water content in Mediterranean trees using high-resolution spectrometry[J]. International Journal of Applied Earth Observation and Geoinformation,2014-01-01,27(PARTB)