Evergreen Coniferous Forests of the Pacific Northwest

  title={Evergreen Coniferous Forests of the Pacific Northwest},
  author={Richard H. Waring and Jerry F. Franklin},
  pages={1380 - 1386}
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… 

Setting the Stage: Vegetation Ecology and Dynamics

The moist coniferous forests of the Pacific Northwest are notable for the dominance of long-lived evergreen conifers, productivity, and the massiveness of the older forests (Franklin and Dyrness

Vegetation Zonation and Conifer Dominance Along Latitudinal and Altitudinal Gradients in Humid Regions of the Western Pacific

  • S. Aiba
  • Environmental Science, Geography
  • 2016
In humid regions of the western Pacific, conifers and deciduous broadleaf trees dominate in colder climate while evergreen broadleaf trees dominate in warmer climate. There are two geographically

A montane Mediterranean climate supports year-round photosynthesis and high forest biomass.

Year-round photosynthesis helps explain the large biomass observed in the Sierra Nevada, and implies adaptive strategies that may contribute to the resiliency or vulnerability of Sierran vegetation to climate change.

Arthropod Diversity and Conservation in Old-Growth Northwest Forests'

Old-growth forests of the Pacific Northwest extend along the coastal region from southern Alaska to northern California and are composed largely of conifer rather than hardwood tree species and the arthropod complex provides a sensitive barometer of the conditions of the forest.

Title Controls on gross production by a semiarid forest growing near its warm and dry ecotonal limit

Climate change is expected to move the spatial patterns of temperature and water availability poleward and upslope, with concomitant shifts in vegetation distribution. Vegetation growing near its

The Relationship of Evergreenness, Crown Architecture, and Leaf Size

  • D. Sprugel
  • Environmental Science
    The American Naturalist
  • 1989
It is suggested that evergreenness and needle leaves go together because small, needle-shaped leaves can readily be displayed in a pattern that disperses the incoming light over a larger number of leaves, which increases total photosynthesis by reducing the energy wastage that occurs when light energy falls on leaves that are already light-saturated.

Exploring The Effects Of Heat and Drought on Conifer Trees: From Semi-Arid Woodlands to Coast Redwoods

Periods of low precipitation and increasing atmospheric temperature are having adverse effects on tree and forest growth and survival in part via limitations upon photosynthesis. Understanding how



The Pygmy Forest Region of Northern California: Studies on Biomass and Primary Productivity

A most striking effect of soil on vegetation occurs on the coastal terraces of Mendocino County, northern California (longitude 123? 50' W, latitude 39? 20' N). Giant forests of the coastal redwood

Fire and Nutrient Cycling in a Douglas-Fir/Larch Forest

Twenty control burns performed with a wide range of fuel loadings and moisture conditions were used to study the effectiveness of old fuel reduction under standing Douglas—fir/larch forest, showing this soil is young and capable of withstanding many years of cyclic intensive burns.

Relationships of Environment to Composition, Structure, and Diversity of Forest Communities of the Central Western Cascades of Oregon

Temperature and moisture stress of conifer saplings and needle nitrogen content of conifer saplings were measured at reference stands representing 16 forest communities in the central portion of the

Old‐Growth Pseudotsuga menziesii Communities of a Western Oregon Watershed: Biomass Distribution and Production Budgets

Living biomass, organic matter distribution, and organic matter production budgets were determined for plant communities of a small watershed dominated by 450—yr—old Pseudotsuga menziesii (Mirb.)


Minor variations in the water content pattern of yellow birch due to precipitation, evapotranspiration, and winter insolation lend little support to the view that birch dieback is due to an increase in temperature or to drought, except possibly through their effects on some unknown biotic factor.

Primary Productivity of Red Alder Ecosystems

Fifty red alder communities from 1 to 65 years old were studied in western Oregon. Highly significant correlations were found between an index of volume and dry weights of whole trees, individual

Analysis of Temperate Forest Ecosystems

  • D. Reichle
  • Environmental Science
    Ecological Studies
  • 1973
Analysis of an Ecosystem.- 1. Combination of Qualitative and Quantitative Approaches.- 2. Analysis of Ecosystems.- 3. Studying the Effects of Environmental Factors on Ecosystems.- 4. Phenology in

Sapwood water storage: its contribution to transpiration and effect upon water conductance through the stems of old‐growth Douglas‐fir

Abstract Enough water is stored in the sapwood of large Douglas-fir to significantly contribute to transpiration. Sapwood water content falls through the season, causing the wood's conductivity to

Factors affecting the canopy resistance of a Douglas-fir forest

The physiological nature of canopy resistance was studied by comparing the stomatal and canopy resistance of a 10-m high Douglas-fir forest. Stomatal resistance of the needles was measured using