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Title | Date | Description | Subjects |
---|---|---|---|
Notes and Design Models on Growth Response from 1981-1982 | Various notes and graphs on a two year study of growth responses. ""Two-year growth response results 1981-1982."" | research notes; | |
A Simulation Approach for Predicting the Effect of Douglas-Fir Tussock Moth Defoliation on Juvenile Tree Growth and Stand Dynamics | 1981 | A spatially dependent tree growth projection model was developed and used to simulate juvenile grand fir, Abies grandis (Dougl.) Lindl., Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, and ponderosa pine, Pinus ponderosa Laws., in northern Idaho. Simulated experiments using the model examined the effects of Douglas-fir tussock moth, Orgyia pseudotsugata McDunnough, defoliation on stand dynamics during the first 40 years of stand development. The sequence and intensity of the defoliation episodes were varied for different combinations of age, stand density, and tree species composition at the time of the first defoliation. The results are summarized in statistical models which predict the long-term effects of tussock moth defoliationon stand dynamics. Results indicate that the insect regulates primary forest production by reducing stand biomass and by redistributing growth energy from host to nonhost trees by altering intertree competitive relationships to the advantage of nonhosts. | research; |
Relationships of Douglas-fir Tussock Moth Defoliation to Site and Stand Characteristics in Northern Idaho | 1981 | Relationships between intensity of defoliation caused by Douglas-fir tussock moth, Orgyia pseudotsugata McDunnough, and descriptive characteristics of forest sites and stands in an outbreak area of northern Idaho were quantified. Defoliation hazard predictive models were developed from inventory data collected in 70 stands covering a range of successional stages and site and stand conditions within the grand fir-western red cedar ecosystem. Two models are presented, each accounting for approximately 50 percent of the variation in defoliation intensity. Defoliation was heavier on upper slope and ridgetop sites, negatively correlated with depth of volcanic ash mantle, and positively correlated with host tree age, proportion of grand fir in the stand, and the ratio of stand density or biomass to site index. A hypothesis that tussock moth outbreaks develop in response to changes in host foliage quality resulting from stresses is presented. | research; forest management; moths; data modeling; |
IFTNC - Annual Report | 1981-04-01 | Forest fertilization for enhancing tree growth and improving the value of harvested timber has been an effective silvicultural practice in the Inland Northwest forests. Early large scale study trials were installed in 1980, 1981 and 1982 to study the effects of nitrogen fertilization on forest nutrition, growth and survival of second-growth, even-aged Rocky Mountain Douglas-fir. A total of 98 research sites located across six ecologically diverse geographic regions throughout the Intermountain Northwest were respectively monitored for twelve, fourteen and sixteen years after establishment. Subsequent evidence from the Douglas-fir trials suggested that elements other than nitrogen, particularly potassium, may be limiting on some forest site types and may have significant influence on forest health. In response, a subset of the original trials was retreated in 1987 and 1988 with nitrogen and/or nitrogen plus potassium treatments. Technical and refereed documents include initial establishment and growth responses. Additional documentation is also presented for the 1987 and 1988 retreatment. | Forest Nutrition; Forest Fertilization; Forest soils; Douglas-fir Growth Response; Nutrient cycles; Forest ecology; Forest Fertilization; Conifer; Pesudotsuga menziesii; Douglas-fir; Forest Nutrition |
IFTNC - 2nd Annual Report | 1982-04-01 | Forest fertilization for enhancing tree growth and improving the value of harvested timber has been an effective silvicultural practice in the Inland Northwest forests. Early large scale study trials were installed in 1980, 1981 and 1982 to study the effects of nitrogen fertilization on forest nutrition, growth and survival of second-growth, even-aged Rocky Mountain Douglas-fir. A total of 98 research sites located across six ecologically diverse geographic regions throughout the Intermountain Northwest were respectively monitored for twelve, fourteen and sixteen years after establishment. Subsequent evidence from the Douglas-fir trials suggested that elements other than nitrogen, particularly potassium, may be limiting on some forest site types and may have significant influence on forest health. In response, a subset of the original trials was retreated in 1987 and 1988 with nitrogen and/or nitrogen plus potassium treatments. Technical and refereed documents include initial establishment and growth responses. Additional documentation is also presented for the 1987 and 1988 retreatment. | Forest Nutrition; Forest Fertilization; Forest soils; Douglas-fir Growth Response; Nutrient cycles; Forest ecology; Forest Fertilization; Conifer; Pesudotsuga menziesii; Douglas-fir; Forest Nutrition |
IFTNC - 3rd Annual Report | 1983-04-01 | Forest fertilization for enhancing tree growth and improving the value of harvested timber has been an effective silvicultural practice in the Inland Northwest forests. Early large scale study trials were installed in 1980, 1981 and 1982 to study the effects of nitrogen fertilization on forest nutrition, growth and survival of second-growth, even-aged Rocky Mountain Douglas-fir. A total of 98 research sites located across six ecologically diverse geographic regions throughout the Intermountain Northwest were respectively monitored for twelve, fourteen and sixteen years after establishment. Subsequent evidence from the Douglas-fir trials suggested that elements other than nitrogen, particularly potassium, may be limiting on some forest site types and may have significant influence on forest health. In response, a subset of the original trials was retreated in 1987 and 1988 with nitrogen and/or nitrogen plus potassium treatments. Technical and refereed documents include initial establishment and growth responses. Additional documentation is also presented for the 1987 and 1988 retreatment. | Forest Nutrition; Forest Fertilization; Forest soils; Douglas-fir Growth Response; Nutrient cycles; Forest ecology; Forest Fertilization; Conifer; Pesudotsuga menziesii; Douglas-fir; Forest Nutrition |
IFTNC - Technical Document Report | 1984 | Forest fertilization for enhancing tree growth and improving the value of harvested timber has been an effective silvicultural practice in the Inland Northwest forests. Early large scale study trials were installed in 1980, 1981 and 1982 to study the effects of nitrogen fertilization on forest nutrition, growth and survival of second-growth, even-aged Rocky Mountain Douglas-fir. A total of 98 research sites located across six ecologically diverse geographic regions throughout the Intermountain Northwest were respectively monitored for twelve, fourteen and sixteen years after establishment. Subsequent evidence from the Douglas-fir trials suggested that elements other than nitrogen, particularly potassium, may be limiting on some forest site types and may have significant influence on forest health. In response, a subset of the original trials was retreated in 1987 and 1988 with nitrogen and/or nitrogen plus potassium treatments. Technical and refereed documents include initial establishment and growth responses. Additional documentation is also presented for the 1987 and 1988 retreatment. | Forest Nutrition; Forest Fertilization; Forest soils; Douglas-fir Growth Response; Nutrient cycles; Forest ecology; Forest Fertilization; Conifer; Pesudotsuga menziesii; Douglas-fir; Forest Nutrition |
IFTNC - 4th Annual Report | 1984-04 | Forest fertilization for enhancing tree growth and improving the value of harvested timber has been an effective silvicultural practice in the Inland Northwest forests. Early large scale study trials were installed in 1980, 1981 and 1982 to study the effects of nitrogen fertilization on forest nutrition, growth and survival of second-growth, even-aged Rocky Mountain Douglas-fir. A total of 98 research sites located across six ecologically diverse geographic regions throughout the Intermountain Northwest were respectively monitored for twelve, fourteen and sixteen years after establishment. Subsequent evidence from the Douglas-fir trials suggested that elements other than nitrogen, particularly potassium, may be limiting on some forest site types and may have significant influence on forest health. In response, a subset of the original trials was retreated in 1987 and 1988 with nitrogen and/or nitrogen plus potassium treatments. Technical and refereed documents include initial establishment and growth responses. Additional documentation is also presented for the 1987 and 1988 retreatment. | Forest Nutrition; Forest Fertilization; Forest soils; Douglas-fir Growth Response; Nutrient cycles; Forest ecology; Forest Fertilization; Conifer; Pesudotsuga menziesii; Douglas-fir; Forest Nutrition |
MS 16 Report | 1984-04-10 | A report on a forest tree nutrition study conducted by the University of Idaho in cooperation with the USDA Forest Service, Potlatch Corporation, the Idaho Department of Lands, and others to evaluate the effects of thinning and nitrogen fertilization. | research; |
Economic Analysis of a Tree Improvent Program for Westerm Larch | 1984-11-01 | An individual-tree simulation model called Prognosis and an economic subroutine called CHEAPO were used to determine financial rotation ages (in this analysis defined as the age at which net present value is maximized) for stands grown with genetically improved and unimproved western larch (Larix occidentalis) in north Idaho. Three hypothetical but reasonable growth functions were tested on two site classes. Sensitivity analyses showed that the tree improvement investment was likely to be profitable at 4 and 5 percent discount rates on excellent sites and at 4 percent on good sites. The analysis was most sensitive to changes in discount rate, site quality, and cone production rate. It was moderately sensitive to variation in time to seed production, number of productive orchard years, and differences among the assumed biological functions. As the hypothetical growth functions were designed to be conservative, economic gains are likely to be larger than those indicated in the analysis. | research; |
Information Requirements for an Operational Fertilization Program | 1985 | A document detailing information about operational fertilization programs in simple bullet points. Some bullet points a blank indicating the document could be an outline or notes for a class or lecture. | research; |
IFTNC - 5th Annual Report | 1985-04 | Forest fertilization for enhancing tree growth and improving the value of harvested timber has been an effective silvicultural practice in the Inland Northwest forests. Early large scale study trials were installed in 1980, 1981 and 1982 to study the effects of nitrogen fertilization on forest nutrition, growth and survival of second-growth, even-aged Rocky Mountain Douglas-fir. A total of 98 research sites located across six ecologically diverse geographic regions throughout the Intermountain Northwest were respectively monitored for twelve, fourteen and sixteen years after establishment. Subsequent evidence from the Douglas-fir trials suggested that elements other than nitrogen, particularly potassium, may be limiting on some forest site types and may have significant influence on forest health. In response, a subset of the original trials was retreated in 1987 and 1988 with nitrogen and/or nitrogen plus potassium treatments. Technical and refereed documents include initial establishment and growth responses. Additional documentation is also presented for the 1987 and 1988 retreatment. | Forest Nutrition; Forest Fertilization; Forest soils; Douglas-fir Growth Response; Nutrient cycles; Forest ecology; Forest Fertilization; Conifer; Pesudotsuga menziesii; Douglas-fir; Forest Nutrition |
IFTNC - 5th Annual Meeting Presentations | 1985-04 | Forest fertilization for enhancing tree growth and improving the value of harvested timber has been an effective silvicultural practice in the Inland Northwest forests. Early large scale study trials were installed in 1980, 1981 and 1982 to study the effects of nitrogen fertilization on forest nutrition, growth and survival of second-growth, even-aged Rocky Mountain Douglas-fir. A total of 98 research sites located across six ecologically diverse geographic regions throughout the Intermountain Northwest were respectively monitored for twelve, fourteen and sixteen years after establishment. Subsequent evidence from the Douglas-fir trials suggested that elements other than nitrogen, particularly potassium, may be limiting on some forest site types and may have significant influence on forest health. In response, a subset of the original trials was retreated in 1987 and 1988 with nitrogen and/or nitrogen plus potassium treatments. Technical and refereed documents include initial establishment and growth responses. Additional documentation is also presented for the 1987 and 1988 retreatment. | Forest Nutrition; Forest Fertilization; Forest soils; Douglas-fir Growth Response; Nutrient cycles; Forest ecology; Forest Fertilization; Conifer; Pesudotsuga menziesii; Douglas-fir; Forest Nutrition |
IFTNC - Technical Document Report | 1985-04 | Forest fertilization for enhancing tree growth and improving the value of harvested timber has been an effective silvicultural practice in the Inland Northwest forests. Early large scale study trials were installed in 1980, 1981 and 1982 to study the effects of nitrogen fertilization on forest nutrition, growth and survival of second-growth, even-aged Rocky Mountain Douglas-fir. A total of 98 research sites located across six ecologically diverse geographic regions throughout the Intermountain Northwest were respectively monitored for twelve, fourteen and sixteen years after establishment. Subsequent evidence from the Douglas-fir trials suggested that elements other than nitrogen, particularly potassium, may be limiting on some forest site types and may have significant influence on forest health. In response, a subset of the original trials was retreated in 1987 and 1988 with nitrogen and/or nitrogen plus potassium treatments. Technical and refereed documents include initial establishment and growth responses. Additional documentation is also presented for the 1987 and 1988 retreatment. | Forest Nutrition; Forest Fertilization; Forest soils; Douglas-fir Growth Response; Nutrient cycles; Forest ecology; Forest Fertilization; Conifer; Pesudotsuga menziesii; Douglas-fir; Forest Nutrition |
IFTNC - 6th Annual Report | 1986-04 | Forest fertilization for enhancing tree growth and improving the value of harvested timber has been an effective silvicultural practice in the Inland Northwest forests. Early large scale study trials were installed in 1980, 1981 and 1982 to study the effects of nitrogen fertilization on forest nutrition, growth and survival of second-growth, even-aged Rocky Mountain Douglas-fir. A total of 98 research sites located across six ecologically diverse geographic regions throughout the Intermountain Northwest were respectively monitored for twelve, fourteen and sixteen years after establishment. Subsequent evidence from the Douglas-fir trials suggested that elements other than nitrogen, particularly potassium, may be limiting on some forest site types and may have significant influence on forest health. In response, a subset of the original trials was retreated in 1987 and 1988 with nitrogen and/or nitrogen plus potassium treatments. Technical and refereed documents include initial establishment and growth responses. Additional documentation is also presented for the 1987 and 1988 retreatment. | Forest Nutrition; Forest Fertilization; Forest soils; Douglas-fir Growth Response; Nutrient cycles; Forest ecology; Forest Fertilization; Conifer; Pesudotsuga menziesii; Douglas-fir; Forest Nutrition |
IFTNC - Technical Document Report | 1986-04 | Forest fertilization for enhancing tree growth and improving the value of harvested timber has been an effective silvicultural practice in the Inland Northwest forests. Early large scale study trials were installed in 1980, 1981 and 1982 to study the effects of nitrogen fertilization on forest nutrition, growth and survival of second-growth, even-aged Rocky Mountain Douglas-fir. A total of 98 research sites located across six ecologically diverse geographic regions throughout the Intermountain Northwest were respectively monitored for twelve, fourteen and sixteen years after establishment. Subsequent evidence from the Douglas-fir trials suggested that elements other than nitrogen, particularly potassium, may be limiting on some forest site types and may have significant influence on forest health. In response, a subset of the original trials was retreated in 1987 and 1988 with nitrogen and/or nitrogen plus potassium treatments. Technical and refereed documents include initial establishment and growth responses. Additional documentation is also presented for the 1987 and 1988 retreatment. | Forest Nutrition; Forest Fertilization; Forest soils; Douglas-fir Growth Response; Nutrient cycles; Forest ecology; Forest Fertilization; Conifer; Pesudotsuga menziesii; Douglas-fir; Forest Nutrition |
Growth and Yield of Leucaena in the Phillippines | 1987 | Empirical yield tables for leucaena plantations in the Phillippines were developed. Site index and height growth equations were developed as components of leucaena growth and yield. The relationships between volume and biomass per ha and top height were quantified. The yield tables and site index equation can be applied in the Phillippines and perhaps other geographic areas where leucaena grows under similar edaphic and management conditions. The methodology described in this paper should be applicable to a variety of tree species grown in even-aged stands. | research; |
IFTNC - 7th Annual Report | 1987-04 | Forest fertilization for enhancing tree growth and improving the value of harvested timber has been an effective silvicultural practice in the Inland Northwest forests. Early large scale study trials were installed in 1980, 1981 and 1982 to study the effects of nitrogen fertilization on forest nutrition, growth and survival of second-growth, even-aged Rocky Mountain Douglas-fir. A total of 98 research sites located across six ecologically diverse geographic regions throughout the Intermountain Northwest were respectively monitored for twelve, fourteen and sixteen years after establishment. Subsequent evidence from the Douglas-fir trials suggested that elements other than nitrogen, particularly potassium, may be limiting on some forest site types and may have significant influence on forest health. In response, a subset of the original trials was retreated in 1987 and 1988 with nitrogen and/or nitrogen plus potassium treatments. Technical and refereed documents include initial establishment and growth responses. Additional documentation is also presented for the 1987 and 1988 retreatment. | Forest Nutrition; Forest Fertilization; Forest soils; Douglas-fir Growth Response; Nutrient cycles; Forest ecology; Forest Fertilization; Conifer; Pesudotsuga menziesii; Douglas-fir; Forest Nutrition |
IFTNC - Technical Document Report | 1987-04 | Forest fertilization for enhancing tree growth and improving the value of harvested timber has been an effective silvicultural practice in the Inland Northwest forests. Early large scale study trials were installed in 1980, 1981 and 1982 to study the effects of nitrogen fertilization on forest nutrition, growth and survival of second-growth, even-aged Rocky Mountain Douglas-fir. A total of 98 research sites located across six ecologically diverse geographic regions throughout the Intermountain Northwest were respectively monitored for twelve, fourteen and sixteen years after establishment. Subsequent evidence from the Douglas-fir trials suggested that elements other than nitrogen, particularly potassium, may be limiting on some forest site types and may have significant influence on forest health. In response, a subset of the original trials was retreated in 1987 and 1988 with nitrogen and/or nitrogen plus potassium treatments. Technical and refereed documents include initial establishment and growth responses. Additional documentation is also presented for the 1987 and 1988 retreatment. | Forest Nutrition; Forest Fertilization; Forest soils; Douglas-fir Growth Response; Nutrient cycles; Forest ecology; Forest Fertilization; Conifer; Pesudotsuga menziesii; Douglas-fir; Forest Nutrition |
Technical Documentation Report | 1987-04-01 | A report of tables divided into five sections: 1. Experimental Design Statistical Models for Four Year Response. 2. Number and Volume of Mortality Trees by Region, Treatment and Cause. 3a. Soil Physical Properties for Douglas-fir Installations. 3b. Soil Chemical Properties for Douglas-fir Installations. 3c. Backdated Data to Time of Thinning for Individual Trees on 1981 Control Plots. 3d. Backdated Growth and Yeild Plot Data for 1981 Control Plots. 4. Summary Characteristics for all Douglas-fir Installations 5. Four Year Growth Response Summaries for all Douglas-fir Installations. | research; |
IFTNC - A Workshop for Member Organizations | 1988 | In 1980, 1981 and 1982 the Intermountain Forest Tree Nutrition Cooperative (IFTNC) established large scale fertilization study trials to study the effects of nitrogen fertilization on forest nutrition, growth and survival of second-growth, even-aged Rocky Mountain Douglas-fir. The purpose of this paper is to summarize the Douglas-fir study trial data results presented in the 1988 IFTNC workshop. | Forest Nutrition; Forest Fertilization; Forest soils; Douglas-fir Growth Response; Nutrient cycles; Forest ecology; Forest Fertilization; Conifer; Pesudotsuga menziesii; Douglas-fir; Forest Nutrition |
IFTNC - Workshop for Member Organizations | 1988-04 | Forest fertilization for enhancing tree growth and improving the value of harvested timber has been an effective silvicultural practice in the Inland Northwest forests. Early large scale study trials were installed in 1980, 1981 and 1982 to study the effects of nitrogen fertilization on forest nutrition, growth and survival of second-growth, even-aged Rocky Mountain Douglas-fir. A total of 98 research sites located across six ecologically diverse geographic regions throughout the Intermountain Northwest were respectively monitored for twelve, fourteen and sixteen years after establishment. Subsequent evidence from the Douglas-fir trials suggested that elements other than nitrogen, particularly potassium, may be limiting on some forest site types and may have significant influence on forest health. In response, a subset of the original trials was retreated in 1987 and 1988 with nitrogen and/or nitrogen plus potassium treatments. Technical and refereed documents include initial establishment and growth responses. Additional documentation is also presented for the 1987 and 1988 retreatment. | Forest Nutrition; Forest Fertilization; Forest soils; Douglas-fir Growth Response; Nutrient cycles; Forest ecology; Forest Fertilization; Conifer; Pesudotsuga menziesii; Douglas-fir; Forest Nutrition |
IFTNC - 9th Annual Report | 1989-04 | Forest fertilization for enhancing tree growth and improving the value of harvested timber has been an effective silvicultural practice in the Inland Northwest forests. Early large scale study trials were installed in 1980, 1981 and 1982 to study the effects of nitrogen fertilization on forest nutrition, growth and survival of second-growth, even-aged Rocky Mountain Douglas-fir. A total of 98 research sites located across six ecologically diverse geographic regions throughout the Intermountain Northwest were respectively monitored for twelve, fourteen and sixteen years after establishment. Subsequent evidence from the Douglas-fir trials suggested that elements other than nitrogen, particularly potassium, may be limiting on some forest site types and may have significant influence on forest health. In response, a subset of the original trials was retreated in 1987 and 1988 with nitrogen and/or nitrogen plus potassium treatments. Technical and refereed documents include initial establishment and growth responses. Additional documentation is also presented for the 1987 and 1988 retreatment. | Forest Nutrition; Forest Fertilization; Forest soils; Douglas-fir Growth Response; Nutrient cycles; Forest ecology; Forest Fertilization; Conifer; Pesudotsuga menziesii; Douglas-fir; Forest Nutrition |
IFTNC - Technical Document Report | 1989-04 | Forest fertilization for enhancing tree growth and improving the value of harvested timber has been an effective silvicultural practice in the Inland Northwest forests. Early large scale study trials were installed in 1980, 1981 and 1982 to study the effects of nitrogen fertilization on forest nutrition, growth and survival of second-growth, even-aged Rocky Mountain Douglas-fir. A total of 98 research sites located across six ecologically diverse geographic regions throughout the Intermountain Northwest were respectively monitored for twelve, fourteen and sixteen years after establishment. Subsequent evidence from the Douglas-fir trials suggested that elements other than nitrogen, particularly potassium, may be limiting on some forest site types and may have significant influence on forest health. In response, a subset of the original trials was retreated in 1987 and 1988 with nitrogen and/or nitrogen plus potassium treatments. Technical and refereed documents include initial establishment and growth responses. Additional documentation is also presented for the 1987 and 1988 retreatment. | Forest Nutrition; Forest Fertilization; Forest soils; Douglas-fir Growth Response; Nutrient cycles; Forest ecology; Forest Fertilization; Conifer; Pesudotsuga menziesii; Douglas-fir; Forest Nutrition |
Effects of Nitrogen Fertilization on Growth of Grand Fir and Douglas-Fir Stands in Northern Idaho | 1989-04-01 | A study of nitrogen fertilization response in thinned and unthinned stands of grand fir (Abies grandis) and Douglas-fir (Pseudotsuga menziesii) in northern Idaho showed that the application of one urea nitrogen treatment applied at a rate of 200 lb N/ac resulted in a significantly higher average basal area growth over a 6-year post-treatment period. Nitrogen fertilization also resulted in a significant height increment increase over the same period. Fourteen years after treatment, fertilization had increased average tree size, in terms of total cubic volume, by 14% in unthinned and by 23% in thinned stands. A comparison of thinned and unthinned stands suggested an increase in tree size (>300%) over the same period without significant reduction in average total cubic volume per acre. Patterns of stand development were altered by nitrogen fertilization. | research; forest management; fertilizer; timber (lumber); |