Contemporary tree growth shows altered climate memory.

Autor: Peltier DMP; Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, Arizona, USA., Anderegg WRL; School of Biological Sciences, University of Utah, Salt Lake City, Utah, USA., Guo JS; Arizona Experiment Station, College of Agriculture and Life Sciences, University of Arizona, Tucson, Arizona, USA., Ogle K; Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, Arizona, USA.; School of Informatics, Computing, and Cyber-Systems, Northern Arizona University, Flagstaff, Arizona, USA.
Jazyk: angličtina
Zdroj: Ecology letters [Ecol Lett] 2022 Dec; Vol. 25 (12), pp. 2663-2674. Date of Electronic Publication: 2022 Oct 18.
DOI: 10.1111/ele.14130
Abstrakt: Trees are long-lived organisms, exhibiting temporally complex growth arising from strong climatic "memory." But conditions are becoming increasingly arid in the western USA. Using a century-long tree-ring network, we find altered climate memory across the entire range of a widespread western US conifer: growth is supported by precipitation falling further into the past (+15 months), while increasingly impacted by more recent temperature conditions (-8 months). Tree-ring datasets can be biased, so we confirm altered climate memory in a second, ecologically-sampled tree-ring network. Predicted drought responses show trees may have also become more sensitive to repeat drought. Finally, plots near sites with relatively longer precipitation memory and shorter temperature memory had significantly lower recent mortality rates (R 2  = 0.61). We argue that increased drought frequency has altered climate memory, demonstrate how non-stationarity may arise from failure to account for memory, and suggest memory length may be predictive of future tree mortality.
(© 2022 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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