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===Frost rings===
Frost ring is a term used to designate a layer of deformed, collapsed [[tracheid]]s and traumatic [[parenchyma]] cells in tree ring analysis. They are formed when air temperature falls below freezing during a period of [[cambial]] activity. They can be used in dendrochronology to indicate years that are colder than usual.<ref>{{cite journal |display-authors=etal|last1=David Montwé |title=Cold adaptation recorded in tree rings highlights risks associated with climate change and assisted migration |journal=Nature Communications |date=Apr 23, 2018 |volume=9 |doi=10.1038/s41467-018-04039-5 |url=https://www.nature.com/articles/s41467-018-04039-5|doi-access=free }}</ref>
== Applications ==
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