Thinning Shock And Response To Fertilizer Less Than Expected In Young Douglas Fir Stand At Wind River Experimental Forest

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Thinning Shock and Response to Fertilizer Less Than Expected in Young Douglas-fir Stand at Wind River Experimental Forest

Dean S. DeBell,Constance A. Harrington,John S. Shumway
Thinning Shock and Response to Fertilizer Less Than Expected in Young Douglas fir Stand at Wind River Experimental Forest Book PDF

Author : Dean S. DeBell,Constance A. Harrington,John S. Shumway
Publisher : Unknown
Page : 20 pages
File Size : 54,6 Mb
Release : 2002
Category : Douglas fir
ISBN : LCCN:00241874

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Thinning Shock and Response to Fertilizer Less Than Expected in Young Douglas-fir Stand at Wind River Experimental Forest by Dean S. DeBell,Constance A. Harrington,John S. Shumway Pdf

Research Paper PNW.

Anonim
Research Paper PNW Book PDF

Author : Anonim
Publisher : Unknown
Page : 318 pages
File Size : 41,8 Mb
Release : 1978
Category : Forests and forestry
ISBN : UCBK:C077310895

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Research Paper PNW. by Anonim Pdf

Forest of Time

Margaret J. Herring,Sarah Greene
Forest of Time Book PDF

Author : Margaret J. Herring,Sarah Greene
Publisher : Unknown
Page : 204 pages
File Size : 47,6 Mb
Release : 2007
Category : Nature
ISBN : UOM:39015064953477

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Forest of Time by Margaret J. Herring,Sarah Greene Pdf

The Wind River Experimental Forest has been called the cradle of forestry in the Pacific Northwest. Located in the Gifford Pinchot National Forest in southwest Washington, the forest is a nexus of groundbreaking discoveries in forest genetics and ecology, and is one of more than seventyfive Forest Service landscapes across the U.S. devoted to forest and range research. Forest of Time follows one hundred years of forest science at Wind River, as social and scientific changes transformed the twentieth century and the Pacific Northwest forest itself. The Forest Service began research at Wind River in 1908 to learn the secrets of the giant Douglas fir. During the course of the century, generations of scientists studied the forest from different angles, and their conclusions changed through time. Initially, Wind River scientists saw the region in need of protec tion from fire and careless logging. They saw scorched, cutover land that required replanting. Later they saw the forest in need of improvement, needing to be freed from pests and unprofitable s pecies and replaced with thrifty, fastgrowing plantations. Wind River soon became a laboratory where foresters from around the world came to learn how to grow the best possible lumber in the shortest amount of time. As plantations replaced natural forest stands, scientists came to Wind River to explore the complexity of oldgrowth forest ecosystems. And today, Wind River is the center of a twentyfirst century exploration of forest canopies and the global connec tion between forests and atmos phere. In Forest of Time, Margaret Herring and Sarah Greene show readers how science grows and changes in unexpec ted ways, much like a forest through time. It is a story of discovery and blindness, of opportunities taken and missed, in a forest dedicated to longterm research.

Annual Report

Oregon State University. Swiss Needle Cast Cooperative
Annual Report Book PDF

Author : Oregon State University. Swiss Needle Cast Cooperative
Publisher : Unknown
Page : 102 pages
File Size : 54,8 Mb
Release : 2004
Category : Douglas fir
ISBN : MINN:31951D02728692R

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Annual Report by Oregon State University. Swiss Needle Cast Cooperative Pdf

Silviculture and Ecology of Western U.S. Forests

John C. Tappeiner,Douglas Alan Maguire,Timothy Brian Harrington
Silviculture and Ecology of Western U S Forests Book PDF

Author : John C. Tappeiner,Douglas Alan Maguire,Timothy Brian Harrington
Publisher : Unknown
Page : 452 pages
File Size : 41,9 Mb
Release : 2007
Category : Nature
ISBN : STANFORD:36105123255775

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Silviculture and Ecology of Western U.S. Forests by John C. Tappeiner,Douglas Alan Maguire,Timothy Brian Harrington Pdf

"An essential reference for forest managers, policy makers, forest scientists, and students, this authoritative volume provides a basis for silviculture practices and contemporary management of western forests."--BOOK JACKET.

Equations for Predicting Height-to-crown-base, 5-year Diameter-growth Rate, 5-year Height-growth Rate, 5-year Mortality Rate, and Maximum Size-density Trajectory for Douglas-fir and Western Hemlock in the Coastal Region of the Pacific Northwest

David W. Hann,David D. Marshall,Mark L. Hanus
Equations for Predicting Height to crown base 5 year Diameter growth Rate 5 year Height growth Rate 5 year Mortality Rate and Maximum Size density Trajectory for Douglas fir and Western Hemlock in the Coastal Region of the Pacific Northwest Book PDF

Author : David W. Hann,David D. Marshall,Mark L. Hanus
Publisher : Unknown
Page : 88 pages
File Size : 50,7 Mb
Release : 2003
Category : Douglas fir
ISBN : MINN:31951D02273882G

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Equations for Predicting Height-to-crown-base, 5-year Diameter-growth Rate, 5-year Height-growth Rate, 5-year Mortality Rate, and Maximum Size-density Trajectory for Douglas-fir and Western Hemlock in the Coastal Region of the Pacific Northwest by David W. Hann,David D. Marshall,Mark L. Hanus Pdf

Using existing permanent research plot data, we developed equations for predicting height-to-crown-base (HCB), 5-yr diametergrowth rate (delta D), 5-yr height-growth rate (delta H), 5-yr mortality rate (PM), and the maximum size-density trajectory for Douglasfir and western hemlock in the coastal region of the Pacific Northwest. With the exception of the HCB equation, the equations developed for predicting trees from untreated plots agreed in predictive behavior with previously published equations for the study area. The HCB equation predicted shorter HCB (and therefore longer crown lengths [CL]) than previously published equations for the study area. Western hemlock showed no response to fertilization. Modifiers for fertilization response were incorporated into the final equations for predicting delta D, delta H, and PM in Douglas-fir. All three modifiers for Douglas-fir predicted an increase in growth and mortality rates with the amount of nitrogen applied and a decrease with number of years since fertilization, with most of the fertilization effect gone within 15 yr of application. For the delta D and delta H modifiers, the size of the increase varied by the site index (SI) of the plot, with plots of lower site quality showing greater increases. For delta D, fertilization response did not appear to vary by plot density, tree size, or tree position within the plot. Modifiers for thinning response were incorporated into the final equations for predicting tree delta D for both species and delta H for Douglas-fir. For both species, the delta D thinning-effects modifier predicted an increased growth rate with the proportion of the BA removed and a decrease with years since thinning; most of the thinning effect was gone within 10 yr. For Douglas-fir, the delta H thinning-effects modifier predicted a reduced growth rate immediately after thinning, with the size of the reduction increasing with the intensity of thinning. Most of the reduction was gone by about 10 yr. For Douglas-fir, the combined effect on delta D and delta H of applying both thinning and fertilization could be adequately characterized by the product of the thinning modifier and the fertilization modifier. The percent increase in predicted growth rate due to a combined treatment thus was greater than the sum of the percent increases for each treatment alone. Analysis of the maximum size-density trajectory data strongly suggests that plots of neither species approach a single maximum stand density index value (SDI) as they develop. The potential yield for a given site therefore depends, not only on its SI, but also on its maximum SDI. Fertilization does not appear to affect the intercept of the maximum size-density line for Douglas-fir. The strengths and weaknesses of the existing data sets and the modeling and analytical approaches tested during development of these equations are presented to aid future modelers, and alternative modeling approaches are explored.

Accelerating Development of Late-successional Conditions in Young Managed Douglas-fir Stands

Steven Lee Garman
Accelerating Development of Late successional Conditions in Young Managed Douglas fir Stands Book PDF

Author : Steven Lee Garman
Publisher : Unknown
Page : 64 pages
File Size : 42,8 Mb
Release : 2003
Category : Douglas fir
ISBN : MINN:31951D02996597B

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Accelerating Development of Late-successional Conditions in Young Managed Douglas-fir Stands by Steven Lee Garman Pdf

The goal of this simulation study was to provide information for defining thinning regimes for young Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stands in the Central Cascades Adaptive Management Area, located in west-central Oregon. Specifically, this study used the ZELIG. PNW (3.0) gap model to evaluate effects of experimental thinning treatments on the development of late-successional attributes and on extracted merchantable volume. Sixty-four thinning treatments were simulated for four rotation intervals (260, 180, 100, and 80 years) starting with a 40-year-old managed Douglas-fir stand. The amount of time for five late successional attributes to reach defined threshold levels, long-term developmental trends of these attributes, and amount of extracted merchantable volume were recorded for each treatment. Stand conditions of selected treatments were used in a subsequent harvest rotation in which 64 additional experimental thinning treatments were applied and evaluated. A total of 1,744 thinning treatments was evaluated in this study. Results of this study confirm previous recommendations for accelerating development of late-successional attributes in young managed stands. Additionally, results show the potential for a range of thinning treatments to attain late-successional conditions in about the same amount of time, but with different tradeoffs in terms of merchantable volume and long-term stand conditions. In general, heavy thinning of existing stands at ages 40 and 60 years promoted rapid development of large boles, vertical diversity, and tree-species diversity, but provided the least amount of extracted volume and required artificial creation of dead wood. Treatments that retained more than 40 percent of the original overstory and thinned to 99 trees per hectare at age 60 delayed attainment of late-successional conditions by 10 to 30 years but provided 12 to 20 percent more extracted volume, resulted in higher levels of most late-successional attributes at the end of a rotation, and required less artificial creation of dead wood. Treatments providing the fastest development of late-successional conditions in subsequent rotations varied with the amount of canopy cover retained at the end of the first rotation. For stands starting with ÃÃY30 percent canopy cover, delaying the first commercial thin for 40 years promoted the most rapid development of vertical structure and shadetolerant stems. Lower canopy-retention levels required heavy or light thins in subsequent entries, depending on the rotation interval, for rapid development of late-successional attributes.

Effects of Fertilization on the Growth and Foliar Nutrition of Immature Douglas-fir in the Interior Cedar-hemlock Zone of British Columbia

Robert Peter Brockley,British Columbia. Forest Science Program
Effects of Fertilization on the Growth and Foliar Nutrition of Immature Douglas fir in the Interior Cedar hemlock Zone of British Columbia Book PDF

Author : Robert Peter Brockley,British Columbia. Forest Science Program
Publisher : University of British Columbia Press
Page : 68 pages
File Size : 42,5 Mb
Release : 2006
Category : Douglas fir
ISBN : MINN:31951D02339294K

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Effects of Fertilization on the Growth and Foliar Nutrition of Immature Douglas-fir in the Interior Cedar-hemlock Zone of British Columbia by Robert Peter Brockley,British Columbia. Forest Science Program Pdf

"The effects of fertilization with nitrogen (N) alone, and in combination with sulphur (S), on the growth and foliar nutrition of six immature, managed Douglas-fir (Pseudotsuga menziesii var. glauca [Beissn.] Franco) stands in the Interior Cedar-Hemlock (ICH) biogeoclimatic zone of British Columbia are reported 6 years after treatment. Results indicate that interior Douglas-fir stands growing on circummesic sites within the ICH zone are generally responsive to fertilization. Disregarding results from one installation that was damaged by Armillaria root disease, average net volume response following fertilization with N alone was 13.5 m3/ha (range: 6.5-24 m3/ha) compared to the control treatment. Six-year volume gains from N+S additions averaged 16 m3/ha (range: 10-23 m3/ha). In relative terms, stand volume responses to fertilization with N and N+S averaged 24% (range: 8-41%) and 28% (range: 16-39%), respectively. Growth projections generated by the tipsy growth and yield program indicate that the accelerated stand development following a single fertilizer application will likely reduce biological rotations (i.e., culmination of mean annual increment) and technical rotations (e.g., minimum harvestable age) by 2-3 years. Relative growth responses compare favourably with results from Douglas-fir fertilization studies in other jurisdictions.‍?‍?Pre- and post-fertilization foliar nutrient analyses indicate that several of the sites were marginally S deficient, and that S status deteriorated 1 year following N fertilization. Added S was readily taken up, thereby maintaining a favourable N:S balance in trees fertilized with N+S. Despite improvements in foliar S status, the incremental growth benefits of added S may be too small on most sites to justify the extra expense involved in blending and applying N+S fertilizers in large-scale aerial operations.‍?‍?Results from this study, and others, indicate that pre-fertilization levels of foliar N and sulphate S (SO4) may have utility in selecting candidate stands and in making appropriate fertilizer prescriptions. For example, the largest growth responses following fertilization may be expected in stands with pre-fertilization foliar N levels less than 11.5 g/kg ( 13 g/kg when using dry combustion analytical methods). Also, low foliar N combined with small amounts of pre-fertilization foliar SO4 (