Authors:	Kunz, Marcel Esper, Jan Kuhl, Eileen Schneider, Lea Büntgen, Ulf Hartl, Claudia
Title:	Combining tree-ring width and density to separate the effects of climate variation and insect defoliation
Online publication date:	10-Aug-2023
Year of first publication:	2023
Language:	english
Abstract:	Though frequently used in dendroclimatology, European larch (Larix decidua Mill.) is regularly defoliated by mass outbreaks of the larch budmoth (Zeiraphera griseana Hb., LBM). The near-cyclic growth depressions are unrelated to but possibly coincide with cold summers, which challenges signal detection on interannual timescales. LBM defoliation events cause sharp maximum latewood density declines and irregular earlywood/latewood ratios in the outbreak year, followed by one or two anomalously narrow rings. Here, we present a process-based method integrating these diverse response patterns to identify and distinguish LBM-related signals from climate-induced deviations. Application to larch sites along elevational transects in the Swiss Alps reveals the algorithm to perform better than existing extreme event detection methods, though our approach enables additional differentiation between insect- and climate-induced signatures. The new process-based multi-parameter algorithm is a suitable tool to identify different causes of growth disturbances and will therefore help to improve both tree-ring-based climate and insect defoliation reconstructions.
DDC:	550 Geowissenschaften 550 Earth sciences 580 Pflanzen (Botanik) 580 Botanical sciences 910 Geografie 910 Geography and travel
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 09 Chemie, Pharmazie u. Geowissensch.
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-9367
Version:	Published version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Forests 14 7
Pages or article number:	1478
Publisher:	MDPI
Publisher place:	Basel
Issue date:	2023
ISSN:	1999-4907
Publisher DOI:	10.3390/f14071478
Appears in collections:	JGU-Publikationen