Multi-resolution imaging spectroscopy resolving the structure of heterogeneous canopies for forest fire fuel properties mapping

Kötz, Benjamin; Schaepman, Michael E.; Morsdorf, Felix; Itten, K.I.; Allgöwer, Britta; Bowyer, Paul K.

doi:10.1109/igarss.2003.1294614

Cited by 1 publication

(1 citation statement)

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“…Various approaches and techniques have been used with different application perspectives and varying level of success, for estimating leaf water content with wide ranging spatial scales, including terrestrial lidar (Elsherif et al, 2019a;Junttila et al, 2019;Junttila et al, 2021), imaging spectroscopy (Kotz et al, 2004), terahertz radiation spectroscopy (Browne et al, 2020) and microwave remote sensing (Konings et al, 2019). However, considering leaf water content monitoring from single trees several times a day (which is required for monitoring diurnal differences in leaf water content) there are still many limiting factors with existing remote sensing methodologies.…”

Section: Introductionmentioning

confidence: 99%

Close-range Hyperspectral Spectroscopy Reveals Leaf Water Content Dynamics

Junttila¹,

Hölttä²,

Saarinen³

et al. 2021

Preprint

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Water plays a crucial role in maintaining plant functionality and drives many ecophysiological processes. The distribution of water resources is in a continuous change due to global warming affecting the productivity of ecosystems around the globe, but there is a lack of non-destructive methods capable of continuous monitoring of plant and leaf water content that would help us in understanding the consequences of the redistribution of water. We studied the utilization of novel small hyperspectral sensors in the 1350-2450 nm spectral range in non-destructive estimation of leaf water content in laboratory and field conditions. We found that the sensors captured up to 96% of the variation in equivalent water thickness (EWT, g/m2) and up to 90% of the variation in relative water content (RWC). These laboratory findings were supported by field measurements, where repeated leaf spectra measurements were in good agreement (R2=0.79) with a time-lagged change of tree xylem diameter. Further tests were done with an indoor plant (Dracaena marginate Lem.) by continuously measuring leaf spectra while drought conditions developed, which revealed detailed diurnal dynamics of leaf water content. We conclude that close-range hyperspectral spectroscopy can provide a novel tool for continuous measurement of leaf water content at the single leaf level and help us to better understand plant responses to varying environmental conditions.

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