Download or read book Developing Ecoregion based Height diameter Models and Reference age Invariant Polymorphic Height and Site Index Curves for Black Spruce and Jack Pine in Manitoba written by Wenli Xu and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Eight different height-diameter models, five height prediction models with stand variables as predictors and six height and site index models were selected, examined, compared and developed for black spruce (Picea mariana [Mill.] B.S.P.) and jack pine (Pinus banksiana Lamb.) in Manitoba. Eight different height-diameter models were fitted using nonlinear modeling techniques and compared in each of the five ecoregions in Manitoba: Churchill River Upland (Ecoregion 88); Hayes River Upland (Ecoregion 89); Lac Seul Upland (Ecoregion 90); Lake of the Woods (Ecoregion 91); Mid-Boreal Lowland (Ecoregion 148). Results suggested that the Weibull-type and Chapman-Richards models were the most suitable models. Differences of the height-diameter relationship among and between ecoregions were tested. Testing results suggested that height-diameter models significantly differred between ecoregions, indicating ecoregion-based or 'local' height-diameter models are needed for prediction purposes. The ecoregion-based height-diameter models developed in this study may provide more accurate information for developing forest growth and yield models. Five height prediction models were examined with the addition of stand density variables into the base height-diameter model. Adding stand variable resulted in increased prediction accuracy. Six height and site index models were examined and compared for black spruce and jack pine based on the provincial stem analysis data and the most suitable models were selected for Manitoba and the provincial height and site index prediction tables were produced.
Download or read book Developing Ecoregion based Height diameter Models and Reference age Invariant Polymorphic Height and Site Index Curves for Black Spruce and Jack Pine in Manitoba microform written by Wenli Xu and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2004 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Eight different height-diameter models, five height prediction models with stand variables as predictors and six height and site index models were selected, examined, compared and developed for black spruce (Picea mariana [Mill.] B.S.P.) and jack pine (Pinus banksiana Lamb.) in Manitoba. Eight different height-diameter models were fitted using nonlinear modeling techniques and compared in each of the five ecoregions in Manitoba: Churchill River Upland (Ecoregion 88); Hayes River Upland (Ecoregion 89); Lac Seul Upland (Ecoregion 90); Lake of the Woods (Ecoregion 91); Mid-Boreal Lowland (Ecoregion 148). Results suggested that the Weibull-type and Chapman-Richards models were the most suitable models. Differences of the height-diameter relationship among and between ecoregions were tested. Testing results suggested that height-diameter models significantly differred between ecoregions, indicating ecoregion-based or 'local' height-diameter models are needed for prediction purposes. The ecoregion-based height-diameter models developed in this study may provide more accurate information for developing forest growth and yield models. Five height prediction models were examined with the addition of stand density variables into the base height-diameter model. Adding stand variable resulted in increased prediction accuracy. Six height and site index models were examined and compared for black spruce and jack pine based on the provincial stem analysis data and the most suitable models were selected for Manitoba and the provincial height and site index prediction tables were produced.
Download or read book Developing Ecoregion based Height diameter Models for Jack Pine and Black Spruce in Ontario written by Changhui Peng and published by Sault Ste. Marie : Ontario Forest Research Institute. This book was released on 2001 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecologically Based Reference age Invariant Polymorphic Height Growth and Site Index Curves for White Spruce in Alberta written by Shongming Huang and published by . This book was released on 1994 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Total and Merchantable Tree Height Equations for Lake States Tree Species written by Alan R. Ek and published by . This book was released on 1981 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymorphic Height and Site Index Curves for the Major Tree Species in Alberta written by C. J. Cieszewski and published by . This book was released on 1991 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In 1989 Cieszewski and Bella developed a new, two-coefficient variable-age-site index (VASI) height model for lodgepole pine in Alberta. This model 1) provided compatible site index (SI) and height-growth estimates, and 2) predicted height growth at any age, without prior knowledge of SI, as a function of any other height and corresponding age. The VASI model had fewer coefficients than the previously developed models used for the major tree species in Alberta, and also could predict height with greater accuracy and precision (Cieszewski and Bella 1989)"--Page [1].
Download or read book Developing and Evaluating Tree Height diameter Models at Three Geographic Scales for Black Spruce in Ontario written by and published by . This book was released on 2004 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of the study reported in this paper were to develop tree height-diameter models for black spruce at provincial, regional, & ecoregional scales in Ontario; to compare the different height-diameter relationships among different geographic scales; and to evaluate the consequences & biases resulting from the use of height-diameter models to ecoregions for which they were not parameterized. Results are presented & discussed based on 11,612 black spruce tree measurements made at permanent sample plots across the boreal & central regions of Ontario. The measurements were used to fit the Chapman-Richards growth model at the three scales of interest. The results suggest the presence of significant variations in height-diameter relationships for black spruce among different ecoregions, and indicate the improvement in accuracy achieved when using ecoregion-based height-diameter models as compared to models developed at regional or provincial scales.
Download or read book Height Growth and Site Index Curves for Managed Even aged Stands of Ponderosa Pine in the Pacific Northwest written by James Willis Barrett and published by . This book was released on 1978 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biological Growth Functions Describe Published Site Index Curves for Lake States Timber Species written by Allen L. Lundgren and published by . This book was released on 1970 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Evaluation of Site Index Models for Young Black Spruce and Jack Pine Plantations in a Changing Climate written by Nirmal Subedi and published by . This book was released on 2009 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report concerns the assessment of potential site productivity for forest planning and in the prediction of forest growth and yield. This was determined using site index (SI) models of young black spruce and jack pines from multiple plantations across Ontario. The equations for these sites were created with varied data of base age specific (BAS), base age invariant (BAI), and dynamic of these species. From here other gauges were given to determine the species models' level of growth and productivity and their variants.--Includes text from document.
Download or read book Prediction of Height Increment for Models of Forest Growth written by Albert R. Stage and published by . This book was released on 1975 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Functional forms of equations were derived for predicting 10-year periodic height increment of forest trees from height, diameter, diameter increment, and habitat type. Crown ratio was considered as an additional variable for prediction, but its contribution was negligible. Coefficients of the function were estimated for 10 species of trees growing in 10 habitat types of northern Idaho and northwestern Montana.
Download or read book Remarks on Height diameter Modeling written by Lei Yuancai and published by . This book was released on 2001 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Juvenile Height Models for Lodgepole Pine and Interior Spruce written by Gordon Donald Nigh and published by University of British Columbia Press. This book was released on 2004 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Juvenile height models have been developed with data collected from a small area of British Columbia for lodgepole pine and interior spruce. The purpose of the project described in this report is to validate these models with data from six biogeoclimatic zones where lodgepole pine & interior spruce commonly occur. Trees were sampled from plots in each zone and annual height was measured directly from pith nodes. A rigorous validation procedure was applied to validate the models for the province as a whole and on a zonal basis. A slight bias revealed in the models led to refitting of new models to the new data. A small validation of the new model for lodgepole pine demonstrates whether it is adequate for use in the interior Douglas fir zone.
Download or read book Height Prediction Equations for Even aged Upland Oak Stands written by Donald E. Hilt and published by . This book was released on 1982 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Method for Constructing Site Index Curves from Measurements of Tree Age and Height written by James Earl Brickell and published by . This book was released on 1968 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of a Subregion based Compatible Height site Index age Model for Black Spruce in Alberta written by Shongming Huang and published by . This book was released on 1997 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Site Index Curves for Ponderosa Pine and Engelmann Spruce in the Southwest Using the Guide Curve Method written by Pablo Fabian Parysow and published by . This book was released on 2003 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
