Terrestrial laser scanning intensity captures diurnal variation in leaf water potential

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Junttila , S , Hölttä , T , Puttonen , E S , Katoh , M , Vastaranta , M , Kaartinen , H , Holopainen , M & Hyyppä , H 2021 , ' Terrestrial laser scanning intensity captures diurnal variation in leaf water potential ' , Remote Sensing of Environment , vol. 255 , 112274 . https://doi.org/10.1016/j.rse.2020.112274

Title: Terrestrial laser scanning intensity captures diurnal variation in leaf water potential
Author: Junttila, Samuli; Hölttä, Teemu; Puttonen, Eetu Severi; Katoh, Masato; Vastaranta, Mikko; Kaartinen, H.; Holopainen, Markus; Hyyppä, Hannu
Contributor organization: Department of Forest Sciences
Forest Health Group
Laboratory of Forest Resources Management and Geo-information Science
Viikki Plant Science Centre (ViPS)
Ecosystem processes (INAR Forest Sciences)
Forest Ecology and Management
Date: 2021-03-15
Language: eng
Number of pages: 10
Belongs to series: Remote Sensing of Environment
ISSN: 0034-4257
DOI: https://doi.org/10.1016/j.rse.2020.112274
URI: http://hdl.handle.net/10138/327848
Abstract: During the past decades, extreme events have become more prevalent and last longer, and as a result drought-induced plant mortality has increased globally. Timely information on plant water dynamics is essential for understanding and anticipating drought-induced plant mortality. Leaf water potential (Psi(L)), which is usually measured destructively, is the most common metric that has been used for decades for measuring water stress. Remote sensing methods have been developed to obtain information on water dynamics from trees and forested landscapes. However, the spatial and temporal resolutions of the existing methods have limited our understanding of the water dynamics and diurnal variation of Psi(L) within single trees. Thus, we investigated the capability of terrestrial laser scanning (TLS) intensity in observing diurnal variation in Psi(L) during a 50-h monitoring period. We aimed to improve the understanding on how large a part of the diurnal variation in Psi(L) can be captured using TLS intensity observations. We found that TLS intensity at the 905 nm wavelength measured from a static position was able to explain 77% of the variation in Psi(L) for three trees of two tree species with a root mean square error of 0.141 MPa. Based on our experiment with three trees, a time series of TLS intensity measurements can be used in detecting changes in Psi(L), 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: Leaf water potential
Lidar intensity
Terrestrial laser scanning
Diurnal variation
Leaf water content
Tree health
Plant water dynamics
1172 Environmental sciences
1181 Ecology, evolutionary biology
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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