Decoupling of temperature and growth of white spruce at western treeline, Alaska, is unrelated to intrinsic water stress.

ABSTRACT: Late 20th century warming has weakened the relationship between temperature and growth in northern forests. This loss of sensitivity to temperature, often attributed to drought stress in warmer regions of the boreal forest, has also been observed in cool, mesic environments, where warming-related growth declines are poorly understood. We used annually resolved ring-width and carbon stable isotope (δ¹³C) chronologies from white spruce forest and woodland stands in southwest Alaska to examine tree responses to climate during a recent warming period (1970-2011). Trends in ring-width index (RWI) varied by stand type: RWI increased in forests and woodlands in the first half of the record (1970-1990), but only woodlands continued that trend in the latter half (1991-2011). Warmer sprin

SUBMITTER: Miller AE 

PROVIDER: S-EPMC12224199 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature