The potential of dual-wavelength terrestrial lidar in early detection of Ips typographus (L.) infestation – Leaf water content as a proxy

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Junttila , S , Holopainen , M , Vastaranta , M , Lyytikäinen-Saarenmaa , P , Kaartinen , H , Hyyppä , J & Hyyppä , H 2019 , ' The potential of dual-wavelength terrestrial lidar in early detection of Ips typographus (L.) infestation – Leaf water content as a proxy ' , Remote Sensing of Environment , vol. 231 , 111264 . https://doi.org/10.1016/j.rse.2019.111264

Title: The potential of dual-wavelength terrestrial lidar in early detection of Ips typographus (L.) infestation – Leaf water content as a proxy
Author: Junttila, S.; Holopainen, M.; Vastaranta, M.; Lyytikäinen-Saarenmaa, P.; Kaartinen, H.; Hyyppä, J.; Hyyppä, H.
Contributor: University of Helsinki, Forest Health Group
University of Helsinki, Department of Forest Sciences
University of Helsinki, Finnish Geospatial Research Institute FGI
University of Helsinki, Forest Health Group
Date: 2019-09-15
Language: eng
Number of pages: 15
Belongs to series: Remote Sensing of Environment
ISSN: 0034-4257
URI: http://hdl.handle.net/10138/304282
Abstract: Climate change is causing novel forest stress around the world due to changes in environmental conditions. Forest pest insects, such as Ips typographus (L.), are spreading toward the northern latitudes and are now able to produce more generations in their current range; this has increased forest disturbances. Timely information on tree decline is critical in allowing forest managers to plan effective countermeasures and to forecast potential infestation areas. Field-based infestation surveys of bark beetles have traditionally involved visual estimates of entrance holes, resin flow, and maternal-gallery densities; such estimates are prone to error and bias. Thus, objective and automated methods for estimating tree infestation status are required. In this study, we investigated the feasibility of dual-wavelength terrestrial lidar in the estimation and detection of I. typographus infestation symptoms. In addition, we examined the relationship between leaf water content (measured as gravimetric water content and equivalent water thickness) and infestation severity. Using two terrestrial lidar systems (operating at 905 nm and 1550 nm), we measured 29 mature Norway spruce (Picea abies [L.] Karst.) trees that exhibited low or moderate infestation symptoms. We calculated single and dual-wavelength lidar intensity metrics from stem and crown points to test these metrics' ability to discriminate I. typographus infestation levels using regressions and linear discriminant analyses. Across the various I. typographus infestation levels, we found significant differences (p 
Subject: 4112 Forestry
Tree health
Dual-wavelength lidar
Terrestrial laser scanning
Leaf water content
Bark beetle infestation
Multispectral lidar
BARK
BEETLE
INTENSITY
CLIMATE-CHANGE
TREE MORTALITY
DECLINE
REFLECTANCE
Ips typographus
LASER SCANNER
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