We compiled a dendrochronological network of more than 5000 tree-ring series from 70 larch host and 73 spruce nonhost sites within the European Alps and Tatra Mountains. We developed annual maps of reconstructed defoliation showing historical persistence of cyclic outbreaks at the site level, recurring c. every 8–9 yr. Our study demonstrates the persistence of recurring insect outbreaks during ad 1700–2000 and emphasizes that a widely distributed tree-ring network and novel analysis methods can contribute towards an understanding of the changes in insect outbreaks and climate dependence.
COBISS.SI-ID: 2396582
Ring width, maximum latewood density, annual height increment and latewood cellulose carbon isotope composition were determined at both sites and the resulting time-series compared with and verified against instrumental climate data for their common period (AD1960-AD2002). Results indicate that ring width sensitivity to summer temperature is very site-dependent, with opposing responses at alpine and lowland sites. Stable carbon isotopes have most potential, responding strongly to summer temperature in both alpine and lowland stands.
COBISS.SI-ID: 2249894