scholarly journals An analysis of the Modeling and Inventory Support Tool: Yield curves vary with Forest Ecosystem Classification

2012 ◽  
Vol 88 (02) ◽  
pp. 147-153
Author(s):  
Daniel Marina ◽  
Sean C. Thomas
Keyword(s):  
Forest Ecosystem ◽  
Basal Area ◽  
Site Index ◽  
Growth And Yield ◽  
Management Planning ◽  
Support Tool ◽  
Forest Management Planning ◽  
Stand Productivity ◽  
Ecosystem Classification ◽  
Definition Of

Stand-level growth and yield models are essential to assessing sustainable levels of forest harvest; such assessments are supported in Ontario by the Modeling and Inventory Support Tool (MIST), which combines updated yield estimates and predicted successional trajectories to improve yield forecasts in Ontario. Currently, forest management planning and MIST stratifies the landbase by the Standard Forest Unit (SFU), but not ecosite as defined under the Forest Ecosystem Classification (FEC) system. Here we examined variation in MIST's input and output parameters (site index, top height, and basal area) for ecosites that fall within the definition of the PW1 SFU in Central Ontario (white-pine-dominated sites). Ecosites showed significant differences in site index values and top height, but not basal area, results indicating systematic differences in productivity among ecosites within the SFU. These results show that fine-scale variation in edaphic factors, as indicated by ecosite information, correspond to differences in stand productivity, and suggest the importance of a more harmonized approach between yield modeling, SFUs, and the FEC system in Ontario.

Strategic analysis of forest vulnerability to risk related to fire: an example from the coniferous boreal forest of Quebec

2015 ◽  
Vol 45 (5) ◽  
pp. 553-565 ◽  
Author(s):  
Sylvie Gauthier ◽  
Frédéric Raulier ◽  
Hakim Ouzennou ◽  
Jean-Pierre Saucier
Keyword(s):  
Boreal Forests ◽  
Coniferous Forest ◽  
Fire Risk ◽  
Growth And Yield ◽  
Management Planning ◽  
Forest Management Planning ◽  
Stand Productivity ◽  
Productive Area ◽  
Coniferous Boreal Forest ◽  
Good Productivity

As fire is a major disturbance in boreal forests, it is now recognized that it has to be taken into account in forest management planning. Moreover, as the time of exposure to fire is related to stand productivity, combining information on productivity and fire should help in assessing the potential to sustainably manage forests. We present a method to assess potential vulnerability to the risk of fire and illustrate it in the boreal coniferous forest of Quebec. This method takes into account some sources of uncertainty related to the estimation of productivity and fire risk. Spatialization of stand productivity from growth and yield curves allowed us to compute the area comprised of productive stands of each district with or without considering fire risk. Results showed that productive area is generally decreasing with decreasing degree-days, increasing elevation, or in relation to surficial geology. Furthermore, districts with moderate to good productivity were found to be vulnerable to fire when burn rates were greater than 0.333%·year–1. Our innovative approach allowed us to assess the vulnerability of the districts to fire and could be helpful in many regions in the context of a projected increase in future area burned under climate change.

A Growth and Yield Model for Improved Eastern Cottonwood Plantations in the Lower Mississippi Delta

1991 ◽  
Vol 15 (4) ◽  
pp. 213-216 ◽  
Author(s):  
Quang V. Cao ◽  
Kenneth M. Durand
Keyword(s):  
Populus Deltoides ◽  
Mississippi Delta ◽  
Basal Area ◽  
Site Index ◽  
Growth And Yield ◽  
Annual Increment ◽  
Yield Model ◽  
Eastern Cottonwood ◽  
Volume Yield ◽  
Growth And Yield Model

Abstract A compatible growth and yield model was developed based on remeasurement data collected from 183 plots on unthinned improved eastern cottonwood (Populus deltoides Bartr.) plantations in the lower Mississippi Delta. The Sullivan and Clutter (1972) equation form was selected for predicting cubic-foot volume yield and projecting volume from site index and initial age and basal area. Yield equations explained 97% and 94%, respectively, of the variations in total outside bark and merchantable inside bark volumes. Mean annual increment of merchantable volume culminated between 8 and 15 years, depending on site index and initial basal area. South. J. Appl. For. 15(4):213-216.

Stand growth responses after fertilization for thinned lodgepole pine, Douglas-fir, and spruce in forests of interior British Columbia, Canada

2019 ◽  
Vol 49 (11) ◽  
pp. 1471-1482
Author(s):  
Woongsoon Jang ◽  
Bianca N.I. Eskelson ◽  
Louise de Montigny ◽  
Catherine A. Bealle Statland ◽  
Derek F. Sattler ◽  
...  
Keyword(s):  
British Columbia ◽  
Picea Glauca ◽  
Lodgepole Pine ◽  
Basal Area ◽  
Stand Density ◽  
Site Index ◽  
Douglas Fir ◽  
Picea Sitchensis ◽  
Growth And Yield ◽  
Growth Responses

This study was conducted to quantify growth responses of three major commercial conifer species (lodgepole pine (Pinus contorta Douglas ex Loudon var. latifolia Engelm. ex S. Watson), interior Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. glauca (Beissn.) Franco), and spruce (white spruce (Picea glauca (Moench) Voss) and hybrid spruce (Picea engelmannii Parry ex. Engelm. × Picea glauca (Moench) Voss × Picea sitchensis (Bong.) Carrière))) to various fertilizer blends in interior British Columbia, Canada. Over 25 years, growth-response data were repeatedly collected across 46 installations. The fertilizer blends were classified into three groups: nitrogen only; nitrogen and sulfur combined; and nitrogen, sulfur, and boron combined. The growth responses for stand volume, basal area, and top height were calculated through absolute and relative growth rate ratios relative to a controlled group. Fertilizer blend, inverse years since fertilization, site index, stand density at fertilization, and their interactions with the fertilizer blend were used as explanatory variables. The magnitude and significance of volume and basal area growth responses to fertilization differed by species, fertilizer-blend groups, and stand-condition variables (i.e., site index and stand density). In contrast, the response in top height growth did not differ among fertilization blends, with the exception of the nitrogen and sulfur fertilizer subgroup for lodgepole pine. The models developed in this study will be incorporated into the current growth and yield fertilization module (i.e., Table Interpolation Program for Stand Yields (TIPSY)), thereby supporting guidance of fertilization applications in interior forests in British Columbia.

Postthinning growth and yield of row-thinned and selectively thinned loblolly and slash pine plantations

1989 ◽  
Vol 19 (2) ◽  
pp. 247-256 ◽  
Author(s):  
V. C. Baldwin Jr. ◽  
D. P. Feduccia ◽  
J. D. Haywood
Keyword(s):  
Loblolly Pine ◽  
Unit Area ◽  
Basal Area ◽  
Site Index ◽  
Slash Pine ◽  
Pine Plantations ◽  
Growth And Yield ◽  
Growth Responses ◽  
Diameter Increment ◽  
Study Results

This study compared growth responses in planted loblolly pine (Pinustaeda L.) and slash pine (P. elliottii Engelm.) stands thinned by using three row-felling methods and at the same density levels, three selective felling methods. The study plots were in six plantations, aged 15–22 years, located in central Louisiana. Growth was measured 5 and 10 years after plot installation. Site index varied from 19.5 to 31.7 m (base age 50) and initial planting densities ranged from 1993 to 2989 trees/ha. Study results show there will likely be less diameter increment and less net basal area and cubic-metre volume per unit area growth and yield, and the growth will be in smaller-sized trees, if row thinning is used rather than selective thinning from below. These differences will probably be greater in slash pine plantations than in loblolly pine plantations.

Accuracy of partially visually assessed stand characteristics: a case study of Finnish forest inventory by compartments

2004 ◽  
Vol 34 (4) ◽  
pp. 916-930 ◽  
Author(s):  
Annika Kangas ◽  
Elina Heikkinen ◽  
Matti Maltamo
Keyword(s):  
Basal Area ◽  
Visual Assessment ◽  
Management Planning ◽  
Forest Management Planning ◽  
Mixed Regression ◽  
Final Error ◽  
Variance Estimates ◽  
Accuracy Assessments ◽  
Measurement Strategies ◽  
Visual Assessments

In Finland, forest management planning is based on standwise assessment of forest variables. The data is traditionally gathered partly by (subjective) sampling and partly by visual assessment, which makes the accuracy assessments difficult. This study consists of an experiment where the visual assessments of field technicians were compared with the accurately measured values. The data consists of assessments from 18 sample plots made by 19 technicians. Each technician assessed four forest characteristics from each stand, for each tree species and each tree class. Basal area was observed in all cases; the other three variables varied according to 18 different measurement strategies. From these observations, mixed models were estimated to analyze to what extent the assessment errors depend on forest characteristics. Variation among both sample plots and field technicians was also considered. The results show that some of the variables could be interpreted as Berkson cases. The assessment errors were also often highly hetero sce dastic. Therefore, variance was explicitly modeled, and the final error models were estimated with weighted mixed regression using the variance estimates as weights. The results show clear variation among technicians, especially in characteristics that include personal judgment. The effect of training could be detected from variation between the technician groups. Furthermore, the broad-leaved tree classes were generally more difficult to assess than conifers.

scholarly journals A Framework for Addressing Multiple Ecosystem Services in Forest Management Planning

2020 ◽  
Author(s):  
Emin Zeki BASKENT ◽  
Jose Guilherme BORGES ◽  
Jan KASPAR
Keyword(s):  
Climate Change ◽  
Ecosystem Services ◽  
Forest Management ◽  
Ecosystem Management ◽  
Forest Ecosystem ◽  
State Of The Art ◽  
Management Planning ◽  
Forest Management Planning ◽  
Wide Range ◽  
Forest Ecosystem Management

Abstract Background: Forest policy and decision makers are challenged by the need to balance the increasing demand for multiple ecosystem services while addressing the impacts of natural disturbances (e.g. wildfires, droughts, wind, insect attacks) and global change scenarios (e.g. climate change) on its potential supply. This challenge provides the motivation for the development of a framework for incorporating concerns with a wide range of ecosystem services in multiple criteria management planning contexts. Thus, the paper focused on both the analysis of the current state-of-the art in forest management planning and the development of a conceptual framework to accommodate various components in a forest ecosystem management planning process.Results: Based on a thorough recent classification of forest management planning problems and the state-of-the-art research, the key dimensions of that framework and the process were defined. The emphasis is on helping identify how concerns with a wide range of ecosystem services may be analyzed and better understood by forest ecosystem management planning. This research discusses the potential of contemporary management planning approaches to address multiple forest ecosystem services. It highlights the need of a landscape-level perspective and of spatial resolution to integrate multiple ecosystem services. It discusses the importance of methods and tools that may help support the involvement of stakeholders and public participation in hierarchical planning processes. Conclusions: The research addressed the need of methods and tools that may encapsulate the ecological, economic and social complexity of forest ecosystem management to provide an efficient plan, information about tradeoffs between ecosystem services as well as the sensitivity of the plan to uncertain parameters (e.g. prices, climate change) in a timely manner.

scholarly journals Forest management planning in the Terai: sharing experiences from Sabaiya, Parsa

1970 ◽  
Vol 16 (1) ◽  
pp. 32-34
Author(s):  
Y.B. Thapa ◽  
P.L. Shaha ◽  
B. Ghimire ◽  
K.C. Arjun ◽  
S. Karmacharya
Keyword(s):  
Forest Management ◽  
Soil Conservation ◽  
Technical Information ◽  
Basal Area ◽  
Management Planning ◽  
Forest Management Planning ◽  
Volume Table ◽  
Stand Parameters ◽  
Area And Volume ◽  
Future Management

The Ministry of Forests and Soil Conservation is in the process of developing operational forest management mechanisms for the Terai regions of Nepal. The Sabaiya pilot scheme in Parsa is under implementation, which witnessed experiences in several issues in the process. The paper aims to share technical experiences with wider audiences. It highlights anomalies in scheme estimation and final enumeration in basic stand parameters such as basal area and volume. It presents possible reasons and provide analysis and insights for future management planning of Terai forests. The paper concludes with a need for more technical information generation, analysis and utilisation approaches in forest management in Nepal. Key words: Forest management, stand parameters, volume table, Sabaiya Banko Janakari Vol.16(1) 2006 pp32-34

Calibrating predicted diameter distribution with additional information in growth and yield predictions

2003 ◽  
Vol 33 (3) ◽  
pp. 430-434 ◽  
Author(s):  
Annika Kangas ◽  
Matti Maltamo
Keyword(s):  
Growth Models ◽  
Basal Area ◽  
Growth And Yield ◽  
Diameter Distribution ◽  
Individual Tree ◽  
Forest Management Planning ◽  
Growing Stock ◽  
Additional Information ◽  
Tree Models ◽  
Diameter Distributions

Diameter distribution of the growing stock is essential in many forest management planning problems. The diameter distribution is the basis for predicting, for example, timber assortments of a stand. Usually the predicted diameter distribution is scaled so that the stem number (or basal area) corresponds to the measured value (or predicted future value), but it may be difficult to obtain a distribution that gives correct estimates for all known variables. Diameter distributions that are compatible with all available information can be obtained using an approach adopted from sampling theory, the calibration estimation. In calibration estimation, the original predicted frequencies are modified so that they respect a set of constraints, the calibration equations. In this paper, an example of utilizing diameter distributions in growth and yield predictions is presented. The example is based on individual tree growth models of Scots pine (Pinus sylvestris L.). Calibration estimation was utilized in predicting the diameter distribution at the beginning of the simulation period. Then, trees were picked from the distribution and their development was predicted with individual tree models. In predicting the current stand characteristics, calibrated diameter distributions proved to be efficient. However, in predicting future yields, calibration estimation did not significantly improve the accuracy of the results.

RPGrow$: A Red Pine Analysis Spreadsheet for the Lake States

1994 ◽  
Vol 11 (4) ◽  
pp. 141-145
Author(s):  
Carol A. Hyldahl ◽  
Gerald H. Grossman
Keyword(s):  
Financial Analysis ◽  
Basal Area ◽  
Site Index ◽  
Red Pine ◽  
Growth And Yield ◽  
Stand Age ◽  
Management Scenarios ◽  
Stand Management ◽  
Lake States ◽  
Final Harvest

Abstract RPGrow$ is a spreadsheet that interactively projects standlevel growth and yield with financial analysis of red pine plantations in the Lake States. Three types of commonly found conditions related to red pine management can be analyzed: (1) an entire rotation from initial planting to final harvest; (2) an existing stand from any point in time until final harvest; and (3) conversion of an existing stand to red pine (marginal analysis). Stand growth projections are for 70 yr. User input includes site index, stand age, initial basal area, trees per acre, thinning regime, costs associated with establishment and culture, tax rates, inflation rate, and discount rate. RPGrow$ calculates and values pulpwood and sawtimber volumes from user-defined stumpage prices. The financial analysis uses discounted cash flow methods to calculate results both with and without tax effects. Different stand management scenarios and economic factors can be compared easily through sensitivity analysis. North. J. Appl. For. 11(4):141-145.

scholarly journals Polymorphic site index curves for Beech (Fagus sylvatica L.) in Central and Eastern Serbia

2021 ◽  
Vol 145 (1-2) ◽  
pp. 31-41
Author(s):  
Branko Stajić ◽  
Snežana Obradović ◽  
Zvonimir Baković ◽  
Marko Kazimirović ◽  
Živan Janjatović
Keyword(s):  
Forest Policy ◽  
Growth Function ◽  
Site Index ◽  
Polymorphic Site ◽  
Site Class ◽  
Management Planning ◽  
Forest Management Planning ◽  
Silvicultural Treatments ◽  
Forestry Sector ◽  
Fagus Sylvatica L

This study was mainly aimed at constructing polymorphic site index curves for beech in the central (Rudnik mountain – RU, about 15,000 ha) and eastern (Žagubica – ŽA, about 7,000 ha) part of its distribution in Serbia. To obtain suitable height-age data and evaluate the best-fit growth model we used 107 felled dominant beech trees. The Korf, Korsun and Chapman-Richards growth functions per site class were first parameterized and then mutually compared with respect to residual statistics and the significance of their parameters. They were additionally parameterized in line with empirical data on the value and age of the culmination of current annual height increment (CAI<sub>h</sub>). The obtained results indicated that the Chapman-Richards growth function showed the best results both by statistical (residuals standard error, significance of the parameters, distribution of residuals, and homoscedasticity) and by empirical criteria (the CAI<sub>h</sub> culmination time, the maximal values of the CAI<sub>h</sub>, and the attained height of trees at a certain age) of the height-age beech modelling in the analyzed regions. The obtained polymorphic site index curves which classify sites with regard to their productivity can be very helpful in planning appropriate silvicultural treatments, and for decision-making in forest management planning, forest policy and ecology and, consequently, in the sustainable management of beech forests in Serbia and some neighbouring countries with a similar forestry sector development.

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