Preprint Article Version 1 This version is not peer-reviewed

Terrestrial Laser Scanning Intensity Captures Diurnal Variation in Leaf Water Potential

Version 1 : Received: 25 May 2020 / Approved: 26 May 2020 / Online: 26 May 2020 (08:26:48 CEST)

How to cite: Junttila, S.; Hölttä, T.; Puttonen, E.; Katoh, M.; Vastaranta, M.; Kaartinen, H.; Holopainen, M.; Hyyppä, H. Terrestrial Laser Scanning Intensity Captures Diurnal Variation in Leaf Water Potential. Preprints 2020, 2020050426 (doi: 10.20944/preprints202005.0426.v1). Junttila, S.; Hölttä, T.; Puttonen, E.; Katoh, M.; Vastaranta, M.; Kaartinen, H.; Holopainen, M.; Hyyppä, H. Terrestrial Laser Scanning Intensity Captures Diurnal Variation in Leaf Water Potential. Preprints 2020, 2020050426 (doi: 10.20944/preprints202005.0426.v1).

Abstract

Drought-induced plant mortality has increased globally during the last decades and is forecasted to influence global vegetation dynamics. Timely information on plant water dynamics is essential for understanding and anticipating drought-induced plant mortality. The most common metric that has been used for decades for measuring water stress is leaf water potential (ΨL), which is measured destructively. To obtain information on water dynamics from trees and forested landscapes, remote sensing methods have been developed. However, the spatial and temporal resolution of the existing methods have limited our understanding of water dynamics and diurnal variation of ΨL within single trees. Thus, we investigated the capability of terrestrial laser scanning (TLS) intensity in observing diurnal variation in ΨL during a 50 hour monitoring period and aimed to improve understanding on how large part of the diurnal variation in ΨL can be captured using intensity observations. We found that TLS intensity at 905 nm wavelength was able to explain 78% of the variation in ΨL for three trees of two tree species with a root-mean square error of 0.137 MPa. Based on our experiment with three trees, time-series of TLS intensity measurements can be used in detecting changes in ΨL, and thus it is worthwhile to expand the investigations to cover a wider range of tree species and forests and further increase our understanding of plant water dynamics at wider spatial and temporal scales.

Subject Areas

leaf water potential; lidar intensity; terrestrial laser scanning; diurnal variation; leaf water content; drought; tree health; plant water dynamics

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