Volume par unité de surface terrière, comme moyen d'évaluer la productivité de stations et la production des plantations d'épinette blanche au Québec

1974 ◽  
Vol 4 (1) ◽  
pp. 127-137
Author(s):  
S. Popovich
Keyword(s):  
Basal Area ◽  
White Spruce ◽  
Growth And Yield ◽  
Average Height ◽  
Site Productivity ◽  
Factors Influencing ◽  
Dominant Height ◽  
Average Form

This paper presents a method of evaluating site productivity by volume per square foot of basal area, comparing it with the method of dominant height. Based on this method, this study also offers tables for estimating the production of plantations in relation to the average height, the average form quotient, and to the average basal area of the stand. Moreover, this study gives practical instructions about several factors influencing growth and yield of white spruce (Piceaglauca, Moench.) plantations in the province of Quebec.

scholarly journals Modeling Growth and Yield ofSchizolobium amazonicumunder Different Spacings

2013 ◽  
Vol 2013 ◽  
pp. 1-10
Author(s):  
Gilson Fernandes da Silva ◽  
Salvador Alejandro Gezan ◽  
Carlos Pedro Boechat Soares ◽  
Luciano Zumerle Zaneti
Keyword(s):  
Basal Area ◽  
Site Index ◽  
Growth And Yield ◽  
Average Height ◽  
Study Region ◽  
Significant Bias ◽  
Dominant Height ◽  
Available Information ◽  
Area And Volume ◽  
Modeling Growth

This study aimed to present an approach to model the growth and yield of the speciesSchizolobium amazonicum(Paricá) based on a study of different spacings located in Pará, Brazil. Whole-stand models were employed, and two modeling strategies (Strategies A and B) were tested. Moreover, the following three scenarios were evaluated to assess the accuracy of the model in estimating total and commercial volumes at five years of age: complete absence of data (S1); available information about the variables basal area, site index, dominant height, and number of trees at two years of age (S2); and this information available at five years of age (S3). The results indicated that the 3 × 2 spacing has a higher mortality rate than normal, and, in general, greater spacing corresponds to larger diameter and average height and smaller basal area and volume per hectare. In estimating the total and commercial volumes for the three scenarios tested, Strategy B seems to be the most appropriate method to estimate the growth and yield of Paricá plantations in the study region, particularly because Strategy A showed a significant bias in its estimates.

scholarly journals A Dynamic Stand Growth Model System for Loblolly Pine Responding to Mid-Rotation Treatments

Forests ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 556
Author(s):  
Mauricio Zapata-Cuartas ◽  
Bronson P. Bullock ◽  
Cristian R. Montes ◽  
Michael B. Kane
Keyword(s):  
Growth Model ◽  
Loblolly Pine ◽  
Basal Area ◽  
Model System ◽  
Growth And Yield ◽  
Site Quality ◽  
Response To Treatment ◽  
Plantation Management ◽  
Vegetation Control ◽  
Dominant Height

Intensive loblolly pine (Pinus taeda L.) plantation management in the southeastern United States includes mid-rotation silvicultural practices (MRSP) like thinning, fertilization, competitive vegetation control, and their combinations. Consistent and well-designed long-term studies considering interactions of MRSP are required to produce accurate projections and evaluate management decisions. Here we use longitudinal data from the regional Mid-Rotation Treatment study established by the Plantation Management Research Cooperative (PMRC) at the University of Georgia across the southeast U.S. to fit and validate a new dynamic model system rooted in theoretical and biological principles. A Weibull pdf was used as a modifier function coupled with the basal area growth model. The growth model system and error projection functions were estimated simultaneously. The new formulation results in a compatible and consistent growth and yield system and provides temporal responses to treatment. The results indicated that the model projections reproduce the observed behavior of stand characteristics. The model has high predictive accuracy (the cross-validation variance explained was 96.2%, 99.7%, and 98.6%; and the prediction root mean square distance was 0.704 m, 19.1 trees ha−1, and 1.03 m2ha−1 for dominant height (DH), trees per hectare (N), and basal area (BA), respectively), and can be used to project the current stand attributes following combinations of MRSP and with different thinning intensities. Simulations across southern physiographic regions allow us to conclude that the most overall ranking of MRSP after thinning is fertilization + competitive vegetation control (Fert + CVC) > fertilization only (Fert) > competitive vegetation control only (CVC), and Fert + CVC show less than additive effect. Because of the model structure, the response to treatment changes with location, age of application, and dominant height growth as indicators of site quality. Therefore, the proposed model adequately represents regional growth conditions.

scholarly journals A Growth and Yield Model for Eucalyptus benthamii in the Southeastern United States

2019 ◽  
Author(s):  
Kevin B Hall ◽  
Jl Stape ◽  
Bronson P Bullock ◽  
Doug Frederick ◽  
Jeff Wright ◽  
...  
Keyword(s):  
United States ◽  
Cold Tolerance ◽  
Southeastern United States ◽  
Basal Area ◽  
Growth And Yield ◽  
Good Growth ◽  
Yield Model ◽  
Dominant Height ◽  
Growth And Yield Model ◽  
Rotation Age

Abstract In recent Eucalyptus cold-tolerance trials, E. benthamii has shown good growth rates as well as cold tolerance for USDA Plant Hardiness Zones 8 and 9. This study developed growth and yield models for E. benthamii in the southeastern United States. A network of 182 temporary sample plots of E. benthamii ranging in age from 1.5 to 13.3 years was established, and inventory data were collected. Site quality was determined by fitting a polymorphic site index curve, whereas a function for stand basal area based on age, dominant height, and site occupancy was fitted. Stand-level volume and dry-weight biomass prediction equations were fitted as a function of dominant height and basal area. Based on the growth and yield model results, mean annual increments ranged from 26.4 m3 ha–1 year–1 at rotation age 6 years on the best sites to 13.7 m3 ha–1 year–1 at rotation age 10 years on the poorest sites. This is the first published set of management-oriented models for land managers considering planting E. benthamii in the southeastern United States.

scholarly journals White spruce growth to age 44 in a provenance test at the Petawawa Research Forest

2006 ◽  
Vol 82 (4) ◽  
pp. 572-578 ◽  
Author(s):  
Kristian Morgenstern ◽  
Margaret Penner
Keyword(s):  
Experimental Design ◽  
New Brunswick ◽  
Basal Area ◽  
White Spruce ◽  
Growth And Yield ◽  
Eastern Canada ◽  
Provenance Test ◽  
Survival Differences ◽  
Late Expression ◽  
Area And Volume

Twenty-five provenances of white spruce were planted in 1963 in 144-tree plots and three replications as part of a provenance test series for eastern Canada. The experiment was well maintained and thinned to 50% of its original stocking in 1986 (age 26 years from seed).Measurements at age 44 were subjected to analyses of variance and correlation and compared with height and survival at age 15. The results demonstrated that at age 15, identification of the best provenances is ineffective because of changes in rank and the late expression of survival differences. At age 44, significant differences among provenances were observed for survival, mean height, diameter, basal area, and volume. The greatest volume was produced by a provenance from Cushing in the Ottawa Valley in Quebec, 287 m3 per ha, which was 11% greater than the volume of the local provenance, Chalk River, Ontario. When ranked on the basis of survival and volume, the best eight provenances included five from Quebec, and one each from New Brunswick, Ontario, and Wisconsin. The experiment shows that at the appropriate stage in a selection program, large plots can yield significant results, which has important implications for the design of experiments. Key words: provenance tests, jack pine, experimental design, growth and yield

scholarly journals Effects of Thinning on Dynamics and Drought Resistance of Aspen-White Spruce Mixtures: Results From Two Study Sites in Saskatchewan

2021 ◽  
Vol 3 ◽  
Author(s):  
Philip G. Comeau
Keyword(s):  
Drought Stress ◽  
Drought Resistance ◽  
Basal Area ◽  
White Spruce ◽  
Tree Size ◽  
Average Height ◽  
Negative Effects ◽  
Positive Effects ◽  
Commercial Thinning ◽  
Study Sites

Drought stress associated with warm temperatures is causing increased mortality and reduced growth of trees in drier portions of the boreal forests of western Canada with both warming and drought expected to increase over the coming decades. While thinning is often shown to reduce drought stress, there is little information on its effects in stands comprised of mixtures of trembling aspen and white spruce that are common in the forests of this region. This study examined effects of pre-commercial thinning on aspen and spruce growth, response to drought stress, and stand dynamics for two study sites located in Saskatchewan, Canada. In unthinned plots aspen densities declined from initial densities of 40,000 to 200,000 trees ha−1 to 2,639 trees ha−1 at age 26. Twenty-one years after thinning (i.e., at age 26) diameter of aspen and spruce had increased, with largest trees being found at the lowest aspen densities (200 aspen ha−1 for aspen and 0 aspen ha−1 for spruce). Aspen density affected average height but not height of aspen top height trees. Spruce height decreased significantly with increasing aspen density. Crown width and live crown ratio of both aspen and spruce declined with increasing aspen density. Data from cores collected from aspen and spruce indicate significant positive effects of tree size (basal area at beginning of the year), and CMI (Climate Moisture Index) on basal area increment of both aspen and spruce while increasing aspen basal area (m2ha−1) had negative effects on aspen and spruce growth. Increasing tree size (basal area) and aspen competition (basal area ha−1) both had negative effects on drought resistance and resilience for both aspen and spruce. Yield projections provided by the Mixedwood Growth Model (MGM) suggest that the mixture of 1,500 aspen ha−1 and 1,000 spruce ha−1 has the potential to provide a 23% increase in total mean annual increment (MAI) with a single harvest at age 100, compared to unthinned aspen stands, but with a 44% reduction in spruce MAI compared to pure spruce stands. Thinning of aspen to densities below 4,000 trees ha−1 at age 5 resulted in reduced aspen yields but increased spruce yields.

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.

Growth and yield comparisons for red pine, white spruce and black spruce plantations in northwestern Ontario

2011 ◽  
Vol 87 (04) ◽  
pp. 494-503 ◽  
Author(s):  
Krish Homagain ◽  
Chander Shahi ◽  
Willard Carmean ◽  
Mathew Leitch ◽  
Colin Bowling
Keyword(s):  
Black Spruce ◽  
Basal Area ◽  
White Spruce ◽  
Red Pine ◽  
Growth And Yield ◽  
Wood Production ◽  
Northwestern Ontario ◽  
Thunder Bay ◽  
Intensive Forest Management ◽  
Forest Lands

Intensive forest management for wood production requires that we identify our most productive forest lands as well as the most productive and most commercially valuable tree species that should be managed on these lands. The Thunder Bay Spacing Trial established in 1950 provides growth and yield comparisons on a productive site for red pine, white spruce, and black spruce. Our analysis based on six remeasurements from 1983 to 2007 show that red pine has produced more than twice the volume of white spruce and about three times the volume of black spruce. The greater volume for red pine in comparison to the spruces is attributed to taller trees, larger average diameters and more basal area.

scholarly journals GROWTH AND YIELD OF EVEN-AGED Cupressus lusitanica PLANTATIONS IN SOUTHERN BRAZIL

FLORESTA ◽  
2021 ◽  
Vol 51 (4) ◽  
pp. 980
Author(s):  
Mário Dobner Jr.
Keyword(s):  
Basal Area ◽  
Site Index ◽  
Growth And Yield ◽  
Site Quality ◽  
Timber Species ◽  
Southern Brazil ◽  
Cupressus Lusitanica ◽  
Dominant Height ◽  
Dominant Height Growth ◽  
Quality Variation

Plantation forestry in southern Brazil demands additional timber species to a higher market differentiation by providing high quality timber and exploitation of market niches. Cupressus lusitanica has long been recognized for this purpose but, until now, it was not properly region-wide quantified in terms of growth and yield. The present study delivers the lacking quantitative approach, which may encourage the commercial use of the species. With this study it was aimed at collecting and processing quantitative data from all known C. lusitanica stands in southern Brazil. Inventories were carried out (60 ha, 6-39 years of age) in order to model the development of dominant height (h100), basal area, volume and dominant diameter (d100). Dominant height was the basis for site quality evaluation, delivering site index curves, which, together with the commercial volume of the stands, allowed yield modelling. A wide amplitude of dominant height growth was detected (10-30 m at 20 years), indicating a great site quality variation. At age of 20 years, commercial volumes of 110 and 620 m³ ha-1 were observed for site indexes of 14 and 26, respectively, equivalent to a maximum of 6-31 m³ ha-1 year-1 at ages between 16-18 years. Results demonstrated in a robust manner that C. lusitanica has a high potential for cultivation in southern Brazil. Thus, offering the opportunity of market differentiation by promoting market niches whose demands timber for special solid end-uses.

Growth and Yield of Red Pine in Central Pennsylvania

1985 ◽  
Vol 2 (4) ◽  
pp. 111-113
Author(s):  
Brian R. Goss ◽  
Todd W. Bowersox ◽  
Rex E. Melton
Keyword(s):  
Basal Area ◽  
Site Index ◽  
Red Pine ◽  
Growth And Yield ◽  
Average Height ◽  
Internal Drainage ◽  
Central Pennsylvania ◽  
Natural Range ◽  
Stand Basal Area

Abstract Reforestation projects of the 1930s established plantations of red pine in central Pennsylvania. When planted in soils of shale or sandstone origin with good internal drainage, these plantations would achieve 65 to 90 ft in average height at 50 years of age. Unthinned stand basal area for trees planted at 6 x 6, 8 x 8, and 10 x 10 ft ranged from 200 to 290 ft² at 42 years of age. Periodic inventories from 16 thinned and 18 unthinned plantations between 15 and 42 years of age were used to determine the importance of original spacing, site index, and thinning on growth and yield. These central Pennsylvania plantations were comparable to natural range stands in accumulated volume and response to thinning, when age and site index were taken into account. North. J. Appl. For. 2:111-113, Dec. 1985.

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.

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