2 edition of Nonlinear models of height growth for Douglas-fir in southwestern Oregon found in the catalog.
Nonlinear models of height growth for Douglas-fir in southwestern Oregon
John A. Scrivani
Written in English
|Statement||by John Scrivani.|
|The Physical Object|
|Pagination||, 99 leaves, bound :|
|Number of Pages||99|
Light Detection and Ranging (LiDAR) has been successfully used to describe a wide range of forest metrics at local, regional and national scales. However, little research has used this technology in young Douglas-fir stands to describe key stand characteristics used as criterion for operational thinning. The objective of this research was to develop models of Cited by: CHD = ~Hi*Pi, where n is the number of height classes, Hi is the relative height of height class i, calculated by dividing the upper limit of a height class by the upper limit of the lowest height class, and P~ is the percent canopy cover in height class i divided by a threshold value of Cited by:
The old‐growth study sites are located in Mount Rainier National Park, USA, (centered around ° N, ° W), ~50–60 km south of the young forest plots. At least years have passed since the most recent stand‐replacement wildfire at each of the study by: development of tree size distributions in douglas‐fir forests under differing disturbance regimes Eric K. Zenner Department of Forest Resources, University of Minnesota, Cleveland Avenue North, Green Hall, St. Paul, Minnesota USACited by:
tic variability on the growth of Douglas-fir along an elevational gradient in the North Cascade Range, Washington (USA), at annual timescales during the 20th century. Multivariate analysis and correlation analysis were used to identify climate– growth relationships. Large-scale commercial thinning of young forests in the Pacific Northwest is currently promoted on public lands to accelerate the development of late-seral forest structure for the benefit of wildlife species such as northern spotted owls (Strix occidentalis caurina) and their prey, including the northern flying squirrel (Glaucomys sabrinus).
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Nonlinear models of height growth for Douglas-fir in southwestern Oregon and the effects of reparameterizations. Alternate models of individual tree height growth are compared on the basis of mean square error, intrinsic nonlinearity, parameter effects nonlinearity, and estimated bias.
Stem analysis data on Douglas-fir height growth in Cited by: 1. Analysis and comparison of nonlinear tree height prediction strategies for Douglas-fir forests H.
Temesgen, V.J. Monleon, and D.W. Hann Abstract: Using an extensive Douglas-fir data set from southwest Oregon, we examined the (1) performance and suitabil- ity of selected prediction strategies, (2) contribution of relative position and stand-density measures in improving tree.
Equations and graphs for dominant height growth and site index (base age 50 years) are presented for Douglas-fir and ponderosa pine in the mixed conifer zone of southwest Oregon.
height growth equations for pure plantations of Douglas-fir, western hemlock, and red alder. Using this technique, fits were significantly improved for all three species by embedding a multi-level nonlinear mixed-effects framework (likelihood ratio test: p Cited by: excellent characterization of the height growth of each individual tree and exhibited the best nonlinear statistical properties.
To develop an equation for predicting dominant height growth of Douglas-fir in southwestOregon, Scrivani () used the combined data from all 89 site-quality trees to examine five parameter-izations of the Weibull.
Analysis and comparison of nonlinear tree height prediction strategies for Douglas-fir forests Article (PDF Available) in Canadian Journal of Forest Research 38(3). The Douglas fir tree is Oregon's state tree.
It is a tall evergreen timber tree of Northwest North America, having short needles and egg-shaped cones. Keywords: Increment (height), site index, Douglas-fir, Oregon (Willamette National Forest).
Research Summary This study provides height growth and site index curves for Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) on hot, dry sites in the Willamette National Forest in western Oregon.
excellent characterization of the height growth of each individual tree and exhibited the best nonlinear statistical properties. To develop an equation for predicting dominant height growth of Douglas—fir in southwest Oregon, Scrivani () used the combined data from all 89 site—quality trees to examine five parameter.
Crown recession rates were estimated by branch mortality dating on sectioned Douglas fir (Pseudotsuga menziesii) stems from temporary plots in SW Oregon in Numerous nonlinear, logarithmic, and gamma-theory generalized linear models were developed for predicting 5-year crown recession across a range in tree, stand and site by: Fang Z, Bailey RL () Nonlinear mixed effects modeling for slash pine dominant height growth following intensive silvicultural treatments.
For Sci – Google Scholar Huang S, Price D, Titus S () Development of ecoregion-based height–diameter models for Cited by: Earliest colonizing Douglas fir (Pseudotsuga menziesii) were sampled for tree-ring dating at eight sites on lowland ( m a.s.l.), recently formed surfaces of known age near three Cascade volcanoes - Mount Rainier, Mount St.
Helens and Mount Hood - in southwestern Washington and northwestern Oregon. Increment cores or stem sections were taken. Developmental decline in height growth in Douglas‐fir. Tree Physiol – Impact of competitor species composition on predicting diameter growth and survival rates of Douglas‐fir trees in southwestern Oregon.
Canadian Journal of Forest Research 31 Nonlinear models for stand table projection in northern. Douglas-fir seedling height growth in old-growth stands was intermediate between that in thinned and unthinned stands.
Download: Download full-size image; Fig. The stand-average age vs. height of Douglas-fir and western hemlock seedlings based on data for (a) thinned, (b) unthinned, and (c) old-growth by: growth Douglas-fir stands in the Pacific Northwest (Waring et al.
These values, which far exceed those for other temperate coniferous forests (Gholz et al.Grier and RunningWaring et al.Jarvis and Leverenz ), suggest that old-growth Douglas-fir forests have an unusual photosynthetic ca.
Dolph KL () Nonlinear equations for predicting diameter inside bark at breast height for young-growth red fir in California and southern Oregon. USDA For. Serv., Pac. S.W. For. Range Exp. Stn., Berkeley, CA. Res. Pap. PSW, p 4Cited by: Modeling stem taper of three central Oregon species using nonlinear mixed effects models and Garber, Sean M.; Maguire, Douglas A.
Variable exponent taper models were developed for three species in the central Oregon Cascades using nonlinear mixed effects models. Introduction of two random effects partially reduced.
The full text of this article hosted at is unavailable due to technical difficulties. Brutian pine (Pinus brutia Ten.) is the most widespread conifer species in the Eastern Mediterranean.
Aboveground biomass equations for small diameter brutian pine trees are needed for accurate fuel inventory and to assess carbon sequestration potential. In this study, we developed tree biomass models based on brutian pine saplings measured in 11 research Cited by: 1.
ORGANON is an individual tree growth model developed for Southwest Oregon, Northwest Oregon, the lands of the Stand Management Cooperative, and red alder plantations in Oregon and Washington. It will project stand development for several species mixes, stand structures and management activities.
Each installation covered hectare and contained 24–48 plot-tree Douglas-fir on a m grid (Littke et al., c).Plot-trees were individual dominant or co-dominant Douglas-fir surrounded by a 5-m radius treatment area (81 m 2).Plot centers were skipped if the understory changed species changed, if the overstory was dominated by species other than Douglas-fir, or if the slope or Cited by: 2.Average daily streamflow in summer (July through September) in basins with to year-old plantations of Douglas-fir was 50% lower than streamflow from reference basins with to year-old forests dominated by Douglas-fir, western hemlock, and other conifers.Project Methods The principal collaborators in this study have discussed the key question regarding which age classes of Douglas-fir--western hemlock forests would provide data on clustering patterns in natural stands most relevant to development of thinning prescriptions in young forests.
Our initial conclusion is that data from mature ( to year-old) and early .