scholarly journals MODELAGEM DA RELAÇÃO HIPSOMÉTRICA PARA BRACATINGAIS DA REGIÃO METROPOLITANA DE CURITIBA-PR

FLORESTA ◽  
2002 ◽  
Vol 32 (2) ◽  
Author(s):  
Alexandra Consuelo De Plácido e Silva Bartoszeck ◽  
Sebastião Do Amaral Machado ◽  
Afonso Figueiredo Filho ◽  
Edílson Batista De Oliveira
Keyword(s):  
Standard Error ◽  
Permanent Plot ◽  
Metropolitan Region ◽  
Permanent Plots ◽  
Quadratic Mean ◽  
Permanent Sample Plots ◽  
Generic Models ◽  
Dominant Height ◽  
Stepwise Procedure ◽  
Site Classes

Este trabalho teve como objetivo testar vários modelos tradicionais e outros genéricos para o ajuste da relação hipsométrica para povoamentos de bracatinga (Mimosa scabrella Benth) da Região Metropolitana de Curitiba, Paraná. Os dados foram obtidos em 20 parcelas permanentes, cujos diâmetros e alturas foram medidos aproximadamente aos 4, 5, 6 e 7 anos de idade e de 124 parcelas temporárias, cobrindo idades de 3 a 18 anos. A existência de dados em vários sítios, idades e densidades permitiu realizar ao todo 751 análises envolvendo a combinação de 23 modelos com três classes de sítios (índices de sítio: 16,8; 13,5 e 10,2 m), idades de 4 a 7 anos para as parcelas permanentes e 3 a 18 para as temporárias, e quatro tratamentos de densidade inicial (testemunha, 2000, 4000 e 8000 árvores/hectare), sendo as temporárias sem tratamento algum. O Índice de Ajuste de Schlaegel (IA), o erro padrão da estimativa em porcentagem (Syx%), seguida da análise de resíduos foram os testes usados para selecionar o melhor modelo. Como se obteve um grande número de combinações e como nenhum dos modelos foi sempre o melhor para todas as combinações, procedeu-se a um ordenamento dos mesmos (ranking) usando as estatísticas (IA e Syx%) para verificar qual dos modelos que, de forma genérica apresentasse a melhor performance. Para as parcelas temporárias e a combinação destas com as testemunhas das parcelas permanentes, os modelos genéricos desenvolvidos por regressão passo a passo tiveram melhor performance. Estes modelos envolveram características do povoamento, tais como, altura dominante (hdom) e diâmetro médio quadrático (dg). MODELLING HEIGHT-DIAMETER RELATIONSHIP FOR Mimosa scabrella STANDS IN THE CURITIBA METROPOLITAN REGION Abstract This research was developed in order to test several traditional end generic models to fit the height-diameter relationship for stands of bracatinga (Mimosa scabrella Benth.) in the Curitiba Metropolitan Region. The data came from 20 permanent sample plots (325 m2 each), whose diameter and heights were measured approximately at ages 4, 5, 6 and 7 years and from 124 temporary sample plots covering ages from 3 to 18 years. The availability of data in several sites, ages and densities made possible to accomplish 751 analysis involving the combination of these mathematical models with three site classes (site indexes: 16.8; 13.5 and 10.2 m), ages from 4 to 7 years for the permanent plots and from 3 to 18 years for the temporary ones, and four treatments (control, 2000, 4000 and 8000 trees/hectare), being the temporary ones without any treatment. The Schlaegel fitting index (I.A.), the standard error of estimate in percent (syx%), followed by analysis of residuals were used to select the models. The existence of a large number of combinations, and given that none of the models was always the best for all combinations, led to the ranking based on I.A. and syx% to identify the best performance. Thus, for the permanent plot data, the Curtis model was the best one. For the temporary plots data, the generic models developed by stepwise procedure provided the best performance. These generic models involved characteristics of the stands, such as, dominant height and quadratic mean DBH.

scholarly journals EVOLUÇÃO DA ÁREA BASAL E DO VOLUME EM BRACATINGAIS NATIVOS SUBMETIDOS À DIFERENTES DENSIDADES INICIAIS E EM DIFERENTES SÍTIOS

FLORESTA ◽  
2002 ◽  
Vol 32 (1) ◽  
Author(s):  
Sebastião Do Amaral Machado ◽  
Ana Elizabete N. Tonon ◽  
Afonso Figueiredo Filho ◽  
Edilson Batista Oliveira
Keyword(s):  
Initial Density ◽  
Basal Area ◽  
Site Index ◽  
Metropolitan Region ◽  
Data Set ◽  
Permanent Sample Plots ◽  
Dominant Height ◽  
Site Classes ◽  
Volume Em ◽  
Area And Volume

Foram analisados os efeitos de quatro densidades iniciais (2, 4, 8 e 25,15 mil plantas por hectare) e de 3 classes de sítio, cujos índices de sítios são 10,2; 13,5 e 16,8 m de altura dominante aos 7 anos de idade, sobre a área basal e volume por hectare em povoamentos nativos de bracatinga (Mimosa scabrella Benth.) na região metropolitana de Curitiba. Os dados provieram de um experimento de densidades em blocos ao acaso medidos nas idades de 4,1; 5,1; 6,3 e 7,6 anos. Os efeitos da densidade inicial e do sítio sobre a área basal (G) e volume (V) por hectare foram verificados através de análise de variância seguida do teste de Tukey, quando pertinente. A densidade inicial de 4 mil plantas por hectare gerou maiores valores de G e V nas últimas idades de medição. A área basal/ha não sofreu efeitos significativos do sítio em nenhuma das medições, enquanto que o volume/ha foi afetado por este fator (sítio) até a idade de 6,3 anos. Evolution of Basal Area and Volume per Hectare in Native "Bracatingais" Submited to Different Initial Densities and Different Sites Abstract The objectives of this research were to study the effects of four initial densities (2000, 4000, 8000 and 25150 plants/ha) and three site classes (site index 10.2, 13.5 and 16.8 m of dominant height at age seven) on basal area (G) and volume per hectare (V) for native stands of bracatinga (Mimosa scabrella Benth.) in the Metropolitan Region of Curitiba, Brazil. The data set came from permanent sample plots of a density trial established in a random blocks design. These plots were measured at ages 4.1, 5.1, 6.3, and 7.6 years of age. The effects of initial density and site on basal area and volume per hectare were verified through graphics and analysis of variance followed by the Tukey test when necessary. The initial density of 4,000 plants/ha generated the highest values of basal area and volume in the last ages of measurement. The basal area/ha did not sufered significative effects of site at any one of the measurement ages, while volume/ha was affected by this factor (site) until the age of 6.3 years.

scholarly journals DENSITY MANAGEMENT DIAGRAM FOR Eucalyptus grandis W. Hill. ex Maiden STANDS CONTROLLED BY DOMINANT HEIGHT

FLORESTA ◽  
2020 ◽  
Vol 51 (1) ◽  
pp. 240
Author(s):  
Gabriel Paes Marangon ◽  
Emanuel Arnoni Costa ◽  
César Augusto Guimarães Finger ◽  
Paulo Renato Schneider ◽  
Matheus Teixeira Martins
Keyword(s):  
Eucalyptus Grandis ◽  
Strong Relationship ◽  
Site Index ◽  
Graphical Analysis ◽  
Coefficient Of Determination ◽  
Permanent Plots ◽  
Volume Number ◽  
Dominant Height ◽  
Development Site ◽  
Relationship Of

Density management diagram for eucalyptus stands controlled by dominant height. The present study aimed to elaborate Density Management Diagrams (DMD) for Eucalyptus grandis W. Hill. ex Maiden stands including the dominant height. Data were obtained from permanent plots installed in the Centro Oriental Riograndense region and the Porto Alegre Metropolitan area, both located in the state of Rio Grande do Sul. The models to describe the relationships between average volume, number of trees per hectare, mean diameter, and dominant height were assessed by the statistical criteria of coefficient of determination (R²), standard error of the estimate in percentage (Syx%), and graphical analysis of residuals. The developed DMD allows for a better control of stocks in the management of stands due to the strong relationship of dominant height with stand development site and forest yield.Keywords: Growth, Site index, Forest regulation, Yield.

scholarly journals Modeling dominant height growth using permanent plot data for Pinus brutia stands in the Eastern Mediterranean region

2021 ◽  
Vol 30 (1) ◽  
pp. eSC03
Author(s):  
Tammam Suliman ◽  
Uta Berger ◽  
Marieke Van der Maaten-Theunissen ◽  
Ernst Van der Maaten ◽  
Wael Ali
Keyword(s):  
Mediterranean Region ◽  
Eastern Mediterranean ◽  
Eastern Mediterranean Region ◽  
Site Index ◽  
Permanent Plots ◽  
Stand Age ◽  
Pinus Brutia ◽  
Dominant Height ◽  
Algebraic Difference ◽  
Generalized Algebraic Difference Approach

Aim of the study: At current, forest management in the Eastern Mediterranean region is largely based on experience rather than on management plans. To support the development of such plans, this study develops and compares site index equations for pure even-aged Pinus brutia stands in Syria using base-age invariant techniques that realistically describe dominant height growth.Materials and methods: Data on top height and stand age were obtained in 2008 and 2016 from 80 permanent plots capturing the whole range of variation in site conditions, stand age and stand density. Both the Algebraic Difference Approach (ADA) and the Generalized Algebraic Difference Approach (GADA) were used to fit eight generalized algebraic difference equations in order to identify the one which describes the data best. For this, 61 permanent plots were used for model calibration and 19 plots for validation.Main results: According to both biological plausibility and model accuracy, the so-called Sloboda equation based on the GADA approach showed the best performance.Research highlights: The study provides a solid classification and comparison of Pinus brutia stands growing in the Eastern Mediterranean region and can thus be used to support sustainable forest management planning.Keywords: site index; Generalized Algebraic Difference Approach (GADA); Sloboda equation.

An Empirical Examination of Dominant Height Projection Accuracy Using Difference Equation Models

2019 ◽  
Vol 66 (3) ◽  
pp. 267-274 ◽  
Author(s):  
Mingliang Wang ◽  
Cristian R Montes ◽  
Bronson P Bullock ◽  
Dehai Zhao
Keyword(s):  
Difference Equation ◽  
Loblolly Pine ◽  
Forest Growth ◽  
Growth And Yield ◽  
Coefficient Of Determination ◽  
Permanent Plots ◽  
Time Interval ◽  
Time Intervals ◽  
Empirical Examination ◽  
Dominant Height

Abstract Site index models developed using the difference equation method, otherwise known as the algebraic difference approach (ADA) along with its generalization (GADA), play an important role in forest growth and yield modeling for operational use. Their projection accuracy tends to be reduced over increasing time intervals, a common modeling phenomenon not yet well understood. In this study, dominant height projections given one single prior observation using three (G)ADA models were examined in relation to pairwise height correlations on an empirical dataset consisting of height remeasurements taken on permanent plots of a second-rotation loblolly pine (Pinus taeda L.) plantation experimental study. The results indicated that the decline in projection accuracy in terms of RMSE or Rp2 (analogical to the coefficient of determination R2) with increasing time intervals is closely associated with the weakening correlations imbedded in distant height remeasurements. The squared coefficient of correlation (ρ2) between paired heights can be set as an upper bound of Rp2 in (G)ADA model prediction of heights conditional on prior observations. An examination of correlation over time interval will be informative of how projection accuracy is likely to change and what the maximal Rp2 might be for any potential (G)ADA model to be developed.

Algorithmic versions of black spruce stand density management diagrams

1997 ◽  
Vol 73 (2) ◽  
pp. 257-265 ◽  
Author(s):  
P. F. Newton
Keyword(s):  
Black Spruce ◽  
Initial Density ◽  
Basal Area ◽  
Stand Density ◽  
File Transfer ◽  
Quadratic Mean ◽  
Dominant Height ◽  
Yield Production ◽  
Quadratic Mean Diameter ◽  
Stand Density Management

Algorithmic versions of stand density management diagrams (SDMDs) were developed for natural and managed black spruce (Picea mariana (Mill.) B.S.P.) stands. Specifically, the IBM-compatible PC-based algorithms (1) graphically illustrate site-specific size-density trajectories for eight user-specified initial density regimes, (2) given (1), calculate and subsequent tabulate periodic yield estimates (mean dominant height, density, mean volume, total volume, total merchantable volume, quadratic mean diameter, and basal area), and (3) given (2), graphically illustrate empirically-derived yield production curves for total merchantable volume ha−1 and stems m−3 with user-specified operability criteria superimposed. Instructions on acquiring the executable algorithmic versions including the required graphical subroutines via the Internet are described. Currently, the algorithms are restricted in applicability to central insular Newfoundland. Key words: stand density management diagrams, black spruce, algorithms, microcomputer, World-Wide Web (WWW), hypertext browser, file transfer protocol (FTP).

Adjustment of the age–height relationship for uneven-aged black spruce stands

2008 ◽  
Vol 38 (7) ◽  
pp. 2003-2012 ◽  
Author(s):  
Hakim Ouzennou ◽  
David Pothier ◽  
Frédéric Raulier
Keyword(s):  
Black Spruce ◽  
Information Criterion ◽  
Diversity Indices ◽  
Site Index ◽  
Diameter Distribution ◽  
Large Network ◽  
Permanent Sample Plots ◽  
Dominant Height ◽  
Spruce Stands ◽  
Height Model

Site index (SI) is commonly used in natural stands, even when their diameter distribution deviates from that of the monospecific, even-aged, fully stocked stands used to develop basic age–height relationships. Since deviations from basic age–height trajectories can be reflected in deviations of stand diameter distribution from a bell shape, we incorporated different diameter diversity indices into an age–height equation to help improve height predictions and determine which index is best related to stand dominant height. This procedure was performed using black spruce ( Picea mariana (Mill.) BSP) stands from a large network of permanent sample plots established across the province of Quebec, Canada. The age–height model that minimized the Akaike’s information criterion used the Shannon evenness index (ESh) as an equation modifier accounting for the diameter diversity variable. The model showed that for stands established on relatively poor sites (SI = 9), no substantial differences in dominant height were found between two contrasting ESh values. For SI = 15, however, the larger ESh value increased the dominant height by as much as 1 m at 80 years. These results suggest that introduction of ESh into an age–height model can improve calculation of site index, particularly in regions characterized by the presence of numerous uneven-aged stands.

scholarly journals Construction of site curves for native Mimosa scabrella stands in the metropolitan region of Curitiba

CERNE ◽  
2011 ◽  
Vol 17 (4) ◽  
pp. 489-497 ◽  
Author(s):  
Sebastião do Amaral Machado ◽  
Ronan Felipe de Souza ◽  
Eldemar Jaskiu ◽  
Ricardo Cavalheiro
Keyword(s):  
Biological Significance ◽  
Analysis Data ◽  
Growth And Yield ◽  
Metropolitan Region ◽  
Coefficient Of Determination ◽  
Site Classification ◽  
Richards Model ◽  
Graphic Analysis ◽  
Site Classes ◽  
Selection Of

This study aims to construct definitive sites curves for native bracatinga stands (Mimosa scabrella Benth) in the metropolitan region of Curitiba. Data used was extracted from 648 pairs of values of dominant height and age. Ten mathematical models were tested for guide curve fitting. Selection of the best performing model was based on adjusted coefficient of determination(Raj²), standard error of estimate in percentage (Syx%) and graphic analysis of residuals. Models were tested and the Chapman-Richards model was selected for construction of limit curves of site classes due to the biological significance of its coefficients, statistical performance and good distribution of residuals. Curve anamorphism and model validity were verified using the test proposed by Kirby (1975). Curve stability was demonstrated based on stem analysis data composing part of the database. Site classification for bracatinga stands was thus considered suitable and can potentially be applied to development of growth and yield equations for this particular species.

scholarly journals Models for estimating macronutrients in Mimosa scabrella Bentham

CERNE ◽  
2010 ◽  
Vol 16 (3) ◽  
pp. 323-334
Author(s):  
Saulo Jorge Téo ◽  
Sebastião do Amaral Machado ◽  
Afonso Figueiredo Filho ◽  
Carlos Bruno Reissmann
Keyword(s):  
Statistical Models ◽  
Metropolitan Region ◽  
Above Ground Biomass ◽  
Stem Biomass ◽  
Independent Variables ◽  
Macronutrient Content ◽  
Ground Biomass ◽  
The North ◽  
Dominant Height ◽  
Model Independent

The aim of this work was to adjust and test different statistical models for estimating macronutrient content in the above-ground biomass of bracatinga (Mimosa scabrella Bentham). The data were collected from 25 bracatinga trees, all native to the north of the metropolitan region of Curitiba, Paraná state, Brazil. To determine the biomass and macronutrient content, the trees were separated into the compartments leaves, branches < 4 cm, branches > 4 cm, wood and stem barks. Different statistical models were adjusted to estimate N, P, K, Ca and Mg contents in the tree compartments, using dendrometric variables as the model independent variables. Based on the results, the equations developed for estimating macronutrient contents were, in general, satisfactory. The most accurate estimates were obtained for the stem biomass compartments and the sum of the biomass compartments. In some cases, the equations had a better performance when crown and stem dimensions, age and dominant height were included as independent variables.

scholarly journals Methodology for the Re-location of Permanent Plot Markers Using Spatial Analysis

2007 ◽  
Vol 24 (1) ◽  
pp. 30-36 ◽  
Author(s):  
Erin D. Small ◽  
Jeremy S. Wilson ◽  
Alan J. Kimball
Keyword(s):  
Vegetation Dynamics ◽  
Essential Role ◽  
Permanent Plot ◽  
Lessons Learned ◽  
Aerial Photographs ◽  
Permanent Plots ◽  
Spatial Coordinates ◽  
Set Up ◽  
Term Data

Abstract A well-designed method of establishing, maintaining, and remeasuring permanent plots plays an essential role in long-term data collection. This article describes the re-location of plots set up 25 years earlier using conventional techniques of paced distances and compass directions. As a result, we needed to design and use a method for re-locating plot markers originally established without the benefit of spatial coordinates. Preplanned ground searches using a GIS, digital orthophotoquads, landmark maps, and aerial photographs improved our plot location efficiency and success. In 2003, we were able to re-locate 90% of the plots set up in 1978 to measure the vegetation dynamics after a fire in Baxter State Park, Maine. The spatial coordinates of these permanent plots were documented for future measurement. Lessons learned and techniques developed for this project can facilitate the re-location of permanent plots in other studies and can also be used to improve the documentation of newly established plot locations.

scholarly journals The Diversity and Diameter Growth Rate of Sprouting-Type Tree in Bukit Pinang-Pinang Forest Permanent Plots

2019 ◽  
Vol 4 (2) ◽  
pp. 184-193
Author(s):  
Ade Ayu Oksari ◽  
Irvan Fadli Wanda ◽  
Erizal Mukhtar ◽  
Chairul Chairul
Keyword(s):  
Growth Rate ◽  
Species Composition ◽  
Forest Regeneration ◽  
Permanent Plot ◽  
Survey Method ◽  
Permanent Plots ◽  
Diameter Growth ◽  
Plant Species Composition ◽  
Individual Tree ◽  
West Sumatra

The process of forest regeneration can take place within a certain period of time. Sprouting is a form of strategy for in adapting to its environment for success in regenerating. The Research on  the diversity and diameter growth rate of sprouting-type tree in Bukit Pinang-pinang forest permanent plots, West Sumatra was carried out from October 2012 to December 2016 in the forest of Bukit Pinang-Pinang, West Sumatra and Herbarium Department of Biology, Universitas Andalas, Padang. This research was conducted using a survey method by census. The parameters analyzed were plant species composition, Morishita Index, Mann-Whitney test, Regression and Correlation test as well as RDGR (Relative Diameter of Growth Rate). The result of experiment was found 40 species of trees sprouting type in forest permanent plot Bukit Pinang-Pinang. The pattern of sprouting type trees distribution in the study locations was found to have a clustered, random and uniform pattern. Relative Diameter Growth Rate (RDGR) of 40 sprouting types of trees in the Bukit Pinang-Pinang forest permanent plots ranged from 0.003 cm/cm/year to 0.0288 cm/cm/year. Altitude did not affect  RDGR of an individual tree sprouting type for 31 years

Sign in / Sign up

Export Citation Format

Share Document