Evergreen coniferous forests of the Pacific northwest [Conifer dominance, USA]

The massive, evergreen coniferous forests in the Pacific Northwest are unique among temperate forest regions of the world. The region's forests escaped decimation during Pleistocene glaciation; they are now dominated by a few broadly distributed and well-adapted conifers that grow to large size...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 1979-06, Vol.204 (4400), p.1380-1386
Hauptverfasser: Waring, R.H, Franklin, J.F
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container_title Science (American Association for the Advancement of Science)
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creator Waring, R.H
Franklin, J.F
description The massive, evergreen coniferous forests in the Pacific Northwest are unique among temperate forest regions of the world. The region's forests escaped decimation during Pleistocene glaciation; they are now dominated by a few broadly distributed and well-adapted conifers that grow to large size and great age. Large trees with evergreen needle- or scale-like leaves have distinct advantages under the current climatic regime. Photosynthesis and nutrient uptake and storage are possible during the relatively warm, wet fall and winter months. High evaporative demand during the warm, dry summer reduces photosynthesis. Deciduous hardwoods are repeatedly at a disadvantage in competing with conifers in the regional climate. Their photosynthesis is predominantly limited to the growing season when evaporative demand is high and water is often limiting. Most nutrients needed are also less available at this time. The large size attained by conifers provides a buffer against environmental stress (especially for nutrients and moisture). The long duration between destructive fires and storms permits conifers to outgrow hardwoods with more limited stature and life spans.
doi_str_mv 10.1126/science.204.4400.1380
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identifier ISSN: 0036-8075
ispartof Science (American Association for the Advancement of Science), 1979-06, Vol.204 (4400), p.1380-1386
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source American Association for the Advancement of Science; JSTOR
subjects 510200 - Environment, Terrestrial- Chemicals Monitoring & Transport- (-1989)
BIOLOGICAL MODELS
Biomass
CENOZOIC ERA
CHEMICAL REACTIONS
Climate models
Coniferous forests
CONIFERS
Deciduous forests
ENVIRONMENTAL EFFECTS
ENVIRONMENTAL SCIENCES
EVAPORATION
FEDERAL REGION X
FIRES
Forest soils
Forest stands
Forests
Forests and forestry
GEOLOGIC AGES
GROWTH
Hardwood forests
Hardwoods
NORTH AMERICA
NUTRIENTS
PHASE TRANSFORMATIONS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
QUATERNARY PERIOD
SYNTHESIS
Temperate regions
TREES
USA
title Evergreen coniferous forests of the Pacific northwest [Conifer dominance, USA]
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