Dec 12, 2017

Evidence for declining forest resilience to wildfires under climate change

by
Camille S. Stevens‐Rumann, Kerry B. Kemp, Philip E. Higuera, Brian J. Harvey, Monica T. Rother, Daniel C. Donato, Penelope Morgan, Thomas T. Veblen
,
Ecology Letters
  • Uses a multi‐regional dataset of 1485 sites across 52 wildfires from the US Rocky Mountains to ask if and how changing climate over the last several decades impacted post‐fire tree regeneration, a key indicator of forest resilience
  • Results highlight significant decreases in tree regeneration in the 21st century
  • Finds that annual moisture deficits were significantly greater from 2000 to 2015 as compared to 1985–1999, suggesting increasingly unfavourable post‐fire growing conditions, corresponding to significantly lower seedling densities and increased regeneration failure
  • Finds that dry forests that already occur at the edge of their climatic tolerance are most prone to conversion to non‐forests after wildfires