Fire Severity Controlled Susceptibility to a 1940s Spruce Beetle Outbreak in Colorado, USA
Fig 3
Dates of establishment expressed as a percentage of total trees established (black bars represent pith or estimated pith dates and gray bars represent minimum ages), mortality expressed as a percentage of total trees alive at the time (last complete year of growth), and releases expressed as a percentage of total trees alive at the time (abrupt > 200% increases in ring-width growth sustained > 10 years) of trees in 20 year bins in (a-c) stands characterized by a pulse of establishment in the 19th or 20th century with no remnant trees, data aggregated from 11 stands; (d-f) stands characterized by a pulse of establishment in the 19th or 20th centuries with remnant trees, data aggregated from 9 stands; and (g-i) stands characterized by heterogeneous age structures, data aggregated from 12 stands.
