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Defining Old Growth for Fire-adapted Forests of the Western United States Ecology and Society
Kaufmann, Merrill R.; U.S. Forest Service (retired); mkaufmann@fs.fed.us; Binkley, Daniel; Colorado Forest Restoration Institute; dan@cnr.colostate.edu; Johnson, Marlin; U.S. Forest Service, Southwest Region; majohnson02@fs.fed.us; Stephens, Scott L.; University of California Berkeley; stephens@nature.berkeley.edu; Swetnam, Thomas W.; Lab of Tree Ring Research, University of Arizona; tswetnam@ltrr.arizona.edu.
There are varying definitions of old-growth forests because of differences in environment and differing fire influence across the Intermountain West. Two general types of forests reflect the role of fire: 1) forests shaped by natural changes in structure and species makeup—plant succession—that are driven by competitive differences among species and individual trees and by small-scale disturbances, and 2) forests where plant succession processes are disrupted by major biological disturbances (fire, insects, wind, or drought) extending across larger areas. Some case examples of old-growth forests where fire was historically frequent are used. The examples sketch out the typical biophysical settings, fire regime, natural disturbance...
Tipo: Peer-Reviewed article Palavras-chave: Fire-adapted forests; Fire frequency; Fire intensity; Fire interval; Fire severity; Old-growth forests; Old-growth landscapes; Old-growth patches; Old-growth stands.
Ano: 2007
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Environmental changes during the last millennium based on multi-proxy palaeoecological records in a savanna-forest mosaic from the northernmost Brazilian Amazon region Anais da ABC (AABC)
MENESES,MARIA ECILENE N.S.; COSTA,MARCONDES L.; ENTERS,DIRK; BEHLING,HERMANN.
ABSTRACTThe environmental changes and the dynamics of the savanna-forest mosaic, over the last 1050 years, have been reconstructed by pollen, charcoal, radiocarbon dating mineralogical and geochemical analyses of sediment cores taken from three different Mauritia flexuosapalm swamps in the northernmost part of the Brazilian Amazon region (northern state of Roraima). Studies on the relationship between the modern pollen rain and the regional vegetation provide additional information for the interpretation of the fossil pollen records. The fossil pollen assemblages and geochemical results indicate relatively wet climatic conditions throughout the recorded period. Despite these moist conditions, fires were frequent and are one of the reasons for the dominance...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fire frequency; Late Holocene; Roraima state-Brazil; Vegetation dynamic.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401623
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