scholarly journals Use data from permanent sampling points in growth and yield modeling

2007 ◽  
Vol 31 (1) ◽  
pp. 59-69 ◽  
Author(s):  
Alexandre José Pereira ◽  
Helio Garcia Leite ◽  
João Carlos Chagas Campos ◽  
Agostinho Lopes de Souza
Keyword(s):  
Eucalyptus Grandis ◽  
Basal Area ◽  
Site Index ◽  
Minas Gerais ◽  
Growth And Yield ◽  
Western Region ◽  
Independent Variables ◽  
Yield Modeling ◽  
Sampling Points ◽  
Growth And Yield Modeling

This study was carried to evaluate the efficiency of the Bitterlich method in growth and yield modeling of the even-aged Eucalyptus stands. 25 plots were setup in Eucalyptus grandis cropped under a high bole system in the Central Western Region of Minas Gerais, Brazil. The sampling points were setup in the center of each plot. The data of four annual mesurements were colleted and used to adjust the three model types using the age, the site index and the basal area as independent variables. The growths models were fitted for volume and mass of trees. The efficiency of the Bitterlich method was confirmed for generating the data for growth and yield modeling.

scholarly journals MODELAGEM DO CRESCIMENTO E PRODUÇÃO EM CLASSES DE PRECIPITAÇÃO PLUVIOMÉTRICA PARA Eucalyptus sp.

FLORESTA ◽  
2014 ◽  
Vol 45 (1) ◽  
pp. 117 ◽  
Author(s):  
Rodrigo Otávio Veiga Miranda ◽  
Andrea Nogueira Dias ◽  
Afonso Figueiredo Filho ◽  
Izabele Domingues Soares ◽  
Jovane Pereira Cruz
Keyword(s):  
Eucalyptus Grandis ◽  
Basal Area ◽  
Site Index ◽  
Growth And Yield ◽  
Eucalyptus Urophylla ◽  
Volumetric Growth ◽  
Dominant Height ◽  
Dominant Height Growth ◽  
Key Steps ◽  
A Site

Uma das etapas fundamentais na modelagem do crescimento e produção é a identificação dos sítios, geralmente determinados pela relação entre altura dominante e idade. Porém há situações em que se torna interessante o uso de outras variáveis, como a precipitação pluviométrica, devido à grande correlação com a produtividade do povoamento. O objetivo deste estudo foi verificar a influência da estratificação por classes de precipitação pluviométrica no crescimento e produção volumétrica de Eucalyptus sp. Os dados provêm de plantios de híbridos de Eucalyptus grandis W. Hill ex Maiden x Eucalyptus urophylla S. T. Blake, do estado da Bahia, distribuídos em sete classes de precipitação, consideradas como estratos conforme o teste de Dette e Neumeyer (2001). Foram determinados os índices de sítio a cada classe de precipitação, sendo utilizada a área basal inicial média em cada um desses sítios. O modelo de Clutter foi empregado para a modelagem e as estimativas de produção foram comparadas pelo teste F de Graybill. A precipitação média influenciou no crescimento em altura dominante. A modelagem realizada por classe de precipitação gerou resultados similares àqueles obtidos pela modelagem sem estratificação, porém com maior precisão, sendo considerada adequada para estimar a produção para povoamentos clonais de eucalipto.Palavras-chave: Eucalipto; ANCOVA não paramétrica; modelo de Clutter. AbstractModeling of growth and yield by pluviometric precipitation classes for Eucalyptus sp. One of the key steps in modeling of growth and yield is the identification of different sites, which are generally determined by the relation of dominant height and age. However, there are situations in which it becomes interesting to use other variables, such as pluviometric precipitation, due to the high correlation with the productivity of the stand. This research aims to investigate influence of stratification by classes of precipitation in volumetric growth and yield of Eucalyptus sp. We collected data in hybrid stands of Eucalyptus grandis W. Hill ex Maiden x Eucalyptus urophylla S. T. Blake, from the state of Bahia, Brazil; such stands were distributed in seven classes of precipitation, each considered a site accordingly to Dette and Neumeyer (2001) test. We determined the site index for each class of precipitation, using the initial average basal area in each site. The Clutter model was used for modeling, and production estimates compared by Graybill F test. The average precipitation influenced the dominant height growth. The modeling performed by precipitation classes generated similar results to those obtained by modeling without stratification, but more accurately; we can consider it appropriate to estimate production to clonal eucalyptus stands.Keywords: Eucalypt; nonparametric ANCOVA; Clutter model.

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.

scholarly journals Forest Growth and Yield Modeling

2011 ◽  
Author(s):  
Aaron R. Weiskittel ◽  
David W. Hann ◽  
John A. Kershaw ◽  
Jerome K. Vanclay
Keyword(s):  
Forest Growth ◽  
Growth And Yield ◽  
Yield Modeling ◽  
Growth And Yield Modeling ◽  
Forest Growth And Yield

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 Simulating Multiaged Coast Redwood Stand Development: Interactions between Regeneration, Structure, and Productivity

2009 ◽  
Vol 24 (1) ◽  
pp. 24-32 ◽  
Author(s):  
John-Pascal Berrill ◽  
Kevin L. O'Hara
Keyword(s):  
Stand Structure ◽  
Basal Area ◽  
Stand Density ◽  
Site Index ◽  
Growth And Yield ◽  
Stand Development ◽  
Area Index ◽  
Coast Redwood ◽  
Stand Growth ◽  
Upper Limit

Abstract Multiaged management regimes and harvesting scenarios were simulated in coast redwood (Sequoia sempervirens [D. Don.] Endl.) stands using models of stand growth and yield (CRYPTOS) and stocking assessment (redwood MASAM). Various stocking and age-class combinations were modeled on site index 100 and 130 ft (50 years). Results demonstrated how the number of cohorts, upper limit of stocking, and cohort densities affected growth and yield. Board foot volume increment reached a plateau in stands with a prescribed upper limit of stocking above leaf area index 7.2 to 8.6. Productivity did not differ between stands with two to five cohorts producing the same tree size at harvest. It was affected by stand structure when a cutting cycle of 20 years was prescribed in stands with three to five cohorts. Stands with the same density returned to the upper limit of stocking much sooner on better sites. Prolonging the cutting cycle by reducing stand density resulted in larger tree sizes at harvest and greater productivity. The growth of trees remaining after cutting 10–50% of stand basal area and growth of new stump sprouts were also simulated. Stands quickly returned to preharvest stocking after light cutting, implying that heavy or frequent light cutting is needed to sustain growth and vigor of regeneration in multiaged coast redwood stands.

The growth and yield responses of a high site quality red pine plantation to seven thinning treatments and two thinning intervals

1986 ◽  
Vol 16 (3) ◽  
pp. 513-520 ◽  
Author(s):  
Hal O. Liechty ◽  
Glenn D. Mroz ◽  
David D. Reed
Keyword(s):  
Volume Growth ◽  
Basal Area ◽  
Site Index ◽  
Red Pine ◽  
Growth And Yield ◽  
Site Quality ◽  
Pine Plantation ◽  
High Site ◽  
Yield Responses ◽  
Lower Site

Seven thinning treatments with residual densities between 60 and 160 ft3/acre (13.8 and 36.8 m2/ha) of basal area were applied to a highly productive (site index, 81 ft (24.7 m); base age, 50 years) red pine (Pinusresinosa Ait.) plantation. After 10 years, periodic basal area growth was maximized over a lower and much broader range of residual densities than previously found in lower site quality stands. Total and merchantable cubic foot volume growth for the 10 year period was not significantly different between treatments. Application of these thinning treatments on a 6- compared with a 10-year interval reduced total and merchantable cubic foot volume growth while increasing the average stand diameter.

scholarly journals La qualité des stations et la productivité des plantations de pin rouge (Pinus resinosa Ait.) au Québec.

1975 ◽  
Vol 51 (1) ◽  
pp. 16-20
Author(s):  
S. Popovich
Keyword(s):  
Basal Area ◽  
Pinus Resinosa ◽  
Site Index ◽  
Red Pine ◽  
Growth And Yield ◽  
Site Quality ◽  
Average Height ◽  
Stand Volume ◽  
Factors Affecting ◽  
The Relationship

This paper presents an evaluation of site quality based on the relationship between volume per square foot of basal area and age of plantation, for planted red pine (Pinus resinosa Ait.) in Quebec.A graph for the three site index classes is included with indication for its use. There is a table showing the values of volume per square foot of basal area as a function of average height and average form quotient of a stand, permitting a rapid evaluation of stand volume of a plantation. Finally, several factors affecting growth and yield of red pine plantations for various sites in Quebec are discussed.

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