Download or read book Growth of Uneven aged Interior Douglas fir Stands as Influenced by Different Stand Structures written by Peter Lawrence Marshall and published by . This book was released on 1996 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report's objectives are to characterize the growth that has occurred on the PSPs on the Knife Creek Block of the Alex Fraser Research Forest, located near Williams Lake, British Columbia. Since establishment in terms of a number of variables including volume and various biomass components, and to relate the growth that has occurred to underlying stand structure conditions in each of the plots.

Download or read book Growth of Uneven aged Interior Douglas fir Stands as Influenced by Different Stand Structures written by Peter Lawrence Marshall and published by . This book was released on 1996 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report's objectives are to characterize the growth that has occurred on the PSPs on the Knife Creek Block of the Alex Fraser Research Forest, located near Williams Lake, British Columbia. Since establishment in terms of a number of variables including volume and various biomass components, and to relate the growth that has occurred to underlying stand structure conditions in each of the plots.

Download or read book Growth of Uneven aged Interior Douglas fir Stands written by Peter Lawrence Marshall and published by . This book was released on 1999 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thinning Even aged Douglas fir Stands written by Kevin Laughlin O'Hara and published by . This book was released on 1987 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Growth and Spacing in an Even aged Stand of Douglas fir written by George R. Staebler and published by . This book was released on 1951 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fifty year Development of Douglas fir Stands Planted at Various Spacings written by Donald L. Reukema and published by . This book was released on 1979 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Third Forest Vegetation Simulator Conference written by and published by . This book was released on 2008 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Forest Vegetation Simulator (FVS) is a suite of computer modeling tools for predicting the long-term effects of alternative forest management actions. FVS was developed in the early 1980s and is used throughout the United Sates and British Columbia. The Third FVS conference, held February 13-15, 2007, in Fort Collins Colorado, contains 20 papers. They describe the use of FVS on the stand and landscape scale, and to analyze fuels management in the presence of insects and fire. Several papers compare FVS predictions of the effects of insects and disease to field measurements. FVS is continually evolving and improving in technology and capability to meet the needs of its ever increasing user community. Papers describe new methods for data acquisition and preparation for input to FVS, new economic analysis capabilities within FVS, new methods for simulating forest regeneration, new developments in calculating growth and mortality, and future plans for incorporating the effects of climate change in model simulations.

Download or read book Proceedings RMRS written by and published by . This book was released on 1998 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigating Dominance in Douglas fir Stands written by Kenneth William Krueger and published by . This book was released on 1967 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Managing the Dry Douglas fir Forests of the Southern Interior written by Alan Vyse and published by . This book was released on 1998 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Workshop was organized to provide researchers with a forum to share research results, identify gaps, and set priorities for the future. Proceedings provide managers of dry Douglas-fir forests with an accessible source of information about the forest type.

Download or read book Natural Regeneration in Managed Uneven aged Douglas fir Stands in the IDFdk3 IDFxm and IDFxw Biogeoclimatic Subzones written by Cariboo Forest Region (B.C.). Research Section and published by . This book was released on 1998 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: Uneven-aged drybelt interior Douglas-fir (Pseudotsuga menziesii var. glauca) stands have been harvested for over 50 years in British Columbia, however, very little information is available on post-harvest natural regeneration success and stand basal area growth rates. In 1995, a retrospective study was initiated to increase understanding of how past harvesting practices have effected natural regeneration establishment and growth within uneven-aged Douglas-fir stands. This extension note summarizes the results from two unpublished reports (Catton 1997; Day 1996). The main results show that natural regeneration was abundant within all the sample blocks.

Download or read book WestPro a Computer Program for Simulating Uneven aged Douglas fir Stand Growth and Yield in the Pacific Northwest written by and published by . This book was released on 2003 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: WestPro is an add-in program designed to work with Microsoft Excel to simulate the growth of uneven-aged Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stands in the Pacific Northwest region of the United States. Given the initial stand state, defined as the number of softwood and hardwood trees per acre by diameter class, WestPro predicts the future stand state for each year of a predetermined time horizon. Management regimes are defined by a target stand distribution and a cutting cycle. Performance indicators include diversity of tree size and species, timber yield, and net present value of harvest over the given horizon. This paper contains background information on the WestPro program and instructions and suggestions for its application. By working the examples found in the text, the user will learn how to simulate the growth of a given initial stand and to predict how different management regimes may affect stand structure, yield, and diversity. Limitations of the model also are discussed.

Download or read book General Technical Report RM written by and published by . This book was released on 1992 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Economic Considerations in Douglas fir Stand Establishment written by T. A. McClay and published by . This book was released on 1955 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Old Growth Ponderosa Pine and Western Larch Stand Structures written by Stephen F. Arno and published by . This book was released on 1997 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamics of an Even aged Stand Structure Mortality Competition and Growth written by Chung-Muh Chen and published by . This book was released on 1976 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of three components - stand structure, competition and growth, and mortality. Data from an unthinned even-aged red pine stand were used for the analysis. Stand structure was described by diameter and height distributions. The red pine diameters over time were assumed to follow a Weibull distribution. The hypotheses were accepted at the 95% confidence level both by Chi-Square and K-S tests. The Weibull parameters were estimated bu the Maximum Likelihood method (MLE). The normal equations resulting from the MLE can be solved by iteration based on order statistics (see Nailey and Dell 1973). For this study, Newton-Raphson iteration was introduced for solving the normal equations. The initial value for the iteration was based on Menon's (1963) estimator of the Weibull shape parameter. The efficiency of this approach was demonstrated by the fast convergence of parameter estimates. Parameters of te diameter distribution were related to stand age, number of trees per aacre and average dominant height by Clutter and Bennet (1965), as well as Burkhart and Strub (1974). Only poor correlations were obtained in their studies. Inthis study, the Weibull parameters were found to be highly correlated with stand age, number of trees per acre, mean diameter and standard deviation of diameter respectively. The tree height probability distribution was estimated from the diameter distribution (the Weibull function) based on height-diametr relationships, a new approach in forestry. The hypothesis was accepted at the 95% confidence Iewel by the K-S test. This concept is not applicable to any situation where tree height and diameter are poorly correlated as would be the case for trees growing in uneven-aged stands. However, the method may be applicable for deriving distributions of crown width (of open-grown trees), functional crown surface or any other tree variable related to tree diameter. In the second component, existing individual tree competition indexes were classified and critically evaluated. The relative tree size concept of these indexes was explored. Currently the zone count competition index has received the greatest attention. In this phase of the study, a set of reasonable factors was presented for modifying and improving the zone zount approach. A strong correlation between the basal area growth and the index was noted for young stands when using the relative basal area as the weighting factor. For older stand ages, the relative live crown ratio was found to be a better weighting factor than the relative basal area. The highest correlation was noted when using the relative current diameter increment as the weighting factor for young and old stands. For future study, it is instructive to use relative functional crown surface and tree size as the weighting factor because crown ratio may not be applicable in many cases. For individual tree competition in uneven-aged stands of mixed species, one should also consider relative species tolerance and other factors in deriving a weighting factor. The existing tree size growth models (open-grown tree and empirical growth models) were discussed in detail. The open-grown tree approach is useful for describing tree size increment of dominant trees. However, it may not predict well the growth behavior of trees in lower crown classes after release. Further-more, lack of information on potential growth of open-grown trees will limit its application. Wxisting empirical growth functions are numerous. A major disadvantage of these models is that they can not explain logically the relationship between the dependent variables. In this second phase of the study, the existing open-grown tree model was modified for taking species tolerance into account. In addition to the open-grown tree approach, a set of nonlinear biological growth models was formulated and tested. For a given site and species in an even-aged stand, the individual tree basal area increment was assumed directly related to the tree initial basal area and inversely related to the tree competition index. A strong multiple correlation (R2=.81 to .85) of this model was noted for two sample plots (site index 65 and ages 32-37). The growth parameters were insensitive between plots. However, for a wider range of stand density, these parameters would be expected to vary density decause the growth parameters are generally related to site; density and age for a given species. The growth model was modified for trees growing in uneven-aged stands. Factors affecting tree-size growth in uneven-aged stands were also discused. In the third component, factors affecting tree mortality in even-aged and uneven-aged standswere cited. Similar to Dale's (1975) method, tree mortality was grouped by increment class and then the mortality in each class was simulated according to a binomial probability distribution. This study tested the approach for each growth period. Simulated mortality was close to the observed data. Tree mortality in each diameter class and each growth period was simulated in the same fashion. The results were also satisfactory. For a specific growth period, mortality proportions were highly related to diameter for each diameter class. Tree mortality was also grouped by stand age classes. Stochastic processes new to forestry were then introduced for estimating the survival probability and death rate over time. The results were consistent with the trend of the observed data over four growth periods. Furthermore, life length probability distributions of individual trees were presented and tested by assuming two mortality rate functions, again a new concept in forestry. The hypotheses were accepted by the K-S test and the 95% confidence level. When applying the above components for individual tree growth prediction, it is instructive to use the nonlinear basal area growth models (equations 21 and 22). For growth period t, deltaBc=f(Cstst-1, Bc-1, Cc-1) for a given site (54) and a given species. Then the basal area growth of individual trees in the next growth period t=1 can be predicted by using the equation deltaBc=f(Cst, Bc, Ct) ... (55) where deltaBt, deltaBc=1 = the basal area growth of a sample tree during the growth period t and t=1 respectively. Cst-1, Cst=the funtional crown surface of the sample tree at the beginning of growth period t and t=1 respectively. Bt-1, Bc = the basal area of the sample tree at the beginning of period t and t=1 respectively. Ct-1, Ct=the competiton index of the sample tree at the beginning of the growth period t and t=1 respectively. The parameters of equation (54) may be fixed for the parameters of equation (55) if observations on Bc=1 are not available for each tree in the model, and if the basal area growth rate will not change greatly from period from period t to period t=1. If information on Bc=1 is available, one would estimate the parameters of model (55) from these data and more reliable results could be expected. Stand structure at the beginning of the period t=1 can be described by the diameter distribution (the Weibull function) and the height distribution (the modified Weibull function) if height data is also available. Tree mortality in each diameter or increment class of period t=1 can be simulated according to the binominal probability.

Download or read book Correlated Guidelines for Management of Uneven aged Drybelt Douglas fir Stands in British Columbia written by British Columbia. Silviculture Interpretations Working Group and published by . This book was released on 1992 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: These guidelines are a correlation of many guidelines for uneven-aged stand management already in place in many forest districts and regions in British Columbia. The guidelines include a statement of principles, standards, and procedures and information on applicable stands; stratification; pre-harvest cruise and silviculture prescription; cutting permits; monetary assessments; pre-work guidance for harvesters; harvest monitoring; post-harvest assessments; stocking surveys; free growing surveys; and reporting.