ASSORTMENT DOWNGRADE CORRECTION FOR CLEAR CUT OF Pinus taeda L. WITH USE OF TRANSITION MATRIX

It is very important that the quantification of a forest's stock is determined efficiently and accurately, in such a way that more detailed information is desirable for the knowledge of the different multiproducts originated. However, the use of taper functions, a precise adjustment method for determining the assortments, does not foresee the appearance of defects in the stem that could disqualify the logs during the forest harvest. This study aimed to use the transition matrix method, a model traditionally used for predict the diametric structure of uneven-aged forests, to correct assortment estimates made by tapering functions, such as failures in tree processing, that provide a disqualification of the logs in the market values. Adapting the concept of the Markov Chain, for the correction of the assortment downgrade, the transition of the assortment classes can be obtained by dividing the actual volume obtained after the operation of the harvesting machine by the volume estimated by the tapering function. In this case, applying this alternative to the clear cut of a 16-year-old Pinus taeda plantation, it was possible to verify the existence of changes, mainly in assortment classes with a thin end diameter of 24 and 18 cm and presenting efficient correction in the estimates. In order to make realistic corrections to the assortment transition, probability matrices must be built for each compartment or forest site to be estimated. Divergences between processing machines or forestry operator’s qualifications can be decisive for the calibration of the model.

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Eight-Year Performance of Loblolly Pine with Pisolithus Ectomycorrhizae on a Good-Quality Forest Site

Southern Journal of Applied Forestry ◽

10.1093/sjaf/12.4.275 ◽

1988 ◽

Vol 12 (4) ◽

pp. 275-280 ◽

Cited By ~ 22

Author(s):

Donald H. Marx ◽

Charles E. Cordell ◽

Alexander Clark

Keyword(s):

Pinus Taeda ◽

Loblolly Pine ◽

Basal Area ◽

Site Index ◽

Forest Site ◽

Water Deficits ◽

Growing Seasons ◽

Area Growth ◽

Pinus Taeda L ◽

Crown Closure

Abstract Loblolly pine (Pinus taeda L) seedlings with different initial amounts of Pisolithus tinctorius (Pt) ectomycorrhizae (Pt index 0, 27, 46, 68, or 88) were planted on a good-quality site (site index 90 ft at age 50) in southwest Georgia. After 8 years and crown closure, trees with Pt indices of 88 and 68 had significantly better survival and greater heights, diameters, volumes, and green weights per tree and per ac than nursery-run, control seedlings (Pt index 0). Volume and weight yields per ac were over 50% greater and volume and weight yields per tree were over 20% greater for trees in the Pt index 88 treatment than they were for control trees. A special statistical analysis indicated that average per ac volume was positively correlated with initial Pt index values larger than 58. Tree-ring analyses showed that trees with a Pt index of 88 had significantly greater annual basal area growth than controls during growing seasons with water deficits of 8 to 13 in. Annual growth did not differ when water deficits were greater or less than these amounts. After 8 years, Pt basidiocarps were present throughout the study site. Mycorrhizal treatment integrity may have been lost after 3 or 4 years. South. J. Appl. For. 12(4):275-280

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Probability of Deriving a Yearly Transition Probability Matrix for Land-Use Dynamics

Sustainability ◽

10.3390/su11226355 ◽

2019 ◽

Vol 11 (22) ◽

pp. 6355 ◽

Cited By ~ 2

Author(s):

Shigeaki F. Hasegawa ◽

Takenori Takada

Keyword(s):

Land Use ◽

Transition Matrix ◽

Transition Probability ◽

Transition Probability Matrix ◽

Negative Solution ◽

Transition Matrices ◽

Positive Elements ◽

Land Use Dynamics ◽

Probability Matrices ◽

Use Studies

Takada’s group developed a method for estimating the yearly transition matrix by calculating the mth power roots of a transition matrix with an interval of m years. However, the probability of obtaining a yearly transition matrix with real and positive elements is unknown. In this study, empirical verification based on transition matrices from previous land-use studies and Monte-Carlo simulations were conducted to estimate the probability of obtaining an appropriate yearly transition probability matrix. In 62 transition probability matrices of previous land-use studies, 54 (87%) could provide a positive or small-negative solution. For randomly generated matrices with differing sizes or power roots, the probability of obtaining a positive or small-negative solution is low. However, the probability is relatively large for matrices with large diagonal elements, exceeding 90% in most cases. These results indicate that Takada et al.’s method is a powerful tool for analyzing land-use dynamics.

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Utilização das matrizes de transição na avaliação e simulação precoces do crescimento de povoamentos de Pinus taeda L.

FLORESTA ◽

10.5380/rf.v27i12.2299 ◽

1997 ◽

Vol 27 (12) ◽

Author(s):

JULIO E. ARCE ◽

WALQUIRIA PIZATTO ◽

CARLOS R. SANQUETTA ◽

JEFERSON L.G. WENDLING ◽

ROMUALDO MAESTRI

Keyword(s):

Pinus Taeda ◽

Transition Matrix ◽

Time Interval ◽

Transition Matrices ◽

Time Intervals ◽

Similar Time ◽

Growth Evaluation ◽

Pinus Taeda L ◽

Individual Trees ◽

Dynamic Cycle

É avaliado e simulado o crescimento de povoamentos jovens, equiâneos, monoespecíficos e homogêneos de Pinus taeda L. utilizando a técnica de simulação Matrizes de Transição. Os dados utilizados provêm de medições realizadas em árvores individuais em 1993 e 1996 (6o e 9o anos), em um experimento de espaçamentos em Pinus taeda L., instalado no município de Jaguariaíva - PR, na Fazenda Lageado, de propriedade da empresa Pisa Florestal. A construção das matrizes de transição a partir de observações diamétricas obtidas de povoamentos de Pinus taeda em duas idades é factível e permite obter simulações coerentes para um período igual ao intervalo entre estas idades. Já a simulação para intervalos de tempo maiores do que o período considerado para a construção das matrizes de transição é desaconselhável, por se tratar de povoamentos jovens e não estar disponível, portanto, informação do ciclo completo da dinâmica da floresta. Use of transition matrices in precocious growth evaluation and simulation of Pinus taeda L. stands Abstract The growth of young, even-aged, monospecific and homogeneous stands of Pinus taeda L. are evaluated and simulated with the Transition Matrix simulation technique. The used data was obtained from measurements over individual trees in 1993 and 1996 (6th and 9th years) in an spacing test of Pinus taeda L. at farm Fazenda Lageado in Jaguariaiva-PR, from the Pisa Florestal company. The transition matrixes construction from two diameter observations separated by a time interval are feasible and conduce to coherent simulations for a similar time interval that the used for the transition matrixes construction. Simulations for longer time intervals that the used for the transition matrixes construction are not recommended because the sampled stands are young and it is not disposable information about the complete dynamic cycle of the forest.

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Regional household poverty and mobility analysis – a transition probability approach

Nierówności społeczne a wzrost gospodarczy ◽

10.15584/nsawg.2020.3.15 ◽

2020 ◽

Vol 63 (3) ◽

pp. 286-302

Author(s):

Damian Mowczan ◽

Keyword(s):

Transition Probability ◽

General Level ◽

Transition Matrices ◽

Equivalent Unit ◽

Central Statistical ◽

Per Capita ◽

Probability Matrices ◽

General Mobility ◽

One Year ◽

The One

The main objective of this paper was to estimate and analyse transition-probability matrices for all 16 of Poland’s NUTS-2 level regions (voivodeship level). The analysis is conducted in terms of the transitions among six expenditure classes (per capita and per equivalent unit), focusing on poverty classes. The period of analysis was two years: 2015 and 2016. The basic aim was to identify both those regions in which the probability of staying in poverty was the highest and the general level of mobility among expenditure classes. The study uses a two-year panel sub-sample of unidentified unit data from the Central Statistical Office (CSO), specifically the data concerning household budget surveys. To account for differences in household size and demographic structure, the study used expenditures per capita and expenditures per equivalent unit simultaneously. To estimate the elements of the transition matrices, a classic maximum-likelihood estimator was used. The analysis used Shorrocks’ and Bartholomew’s mobility indices to assess the general mobility level and the Gini index to assess the inequality level. The results show that the one-year probability of staying in the same poverty class varies among regions and is lower for expenditures per equivalent units. The highest probabilities were identified in Podkarpackie (expenditures per capita) and Opolskie (expenditures per equivalent unit), and the lowest probabilities in Kujawsko-Pomorskie (expenditures per capita) and Małopolskie (expenditures per equivalent unit). The highest level of general mobility was noted in Małopolskie, for both categories of expenditures.

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Faculty Opinions recommendation of Apparent homology of expressed genes from wood-forming tissues of loblolly pine (Pinus taeda L.) with Arabidopsis thaliana.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.1015332.196410 ◽

2003 ◽

Author(s):

Guenter Theissen

Keyword(s):

Arabidopsis Thaliana ◽

Pinus Taeda ◽

Loblolly Pine ◽

Pinus Taeda L

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A Consensus Map for Loblolly Pine (Pinus taeda L.). I. Construction and Integration of Individual Linkage Maps From Two Outbred Three-Generation Pedigrees

Genetics ◽

10.1093/genetics/151.1.321 ◽

1999 ◽

Vol 151 (1) ◽

pp. 321-330 ◽

Cited By ~ 4

Author(s):

Mitchell M Sewell ◽

Bradley K Sherman ◽

David B Neale

Keyword(s):

Pinus Taeda ◽

Loblolly Pine ◽

Fragment Length Polymorphism ◽

Random Amplified Polymorphic Dna ◽

Mapping Function ◽

Genetic Maps ◽

Linkage Data ◽

Linkage Maps ◽

Consensus Map ◽

Pinus Taeda L

Abstract A consensus map for loblolly pine (Pinus taeda L.) was constructed from the integration of linkage data from two unrelated three-generation outbred pedigrees. The progeny segregation data from restriction fragment length polymorphism, random amplified polymorphic DNA, and isozyme genetic markers from each pedigree were recoded to reflect the two independent populations of parental meioses, and genetic maps were constructed to represent each parent. The rate of meiotic recombination was significantly greater for males than females, as was the average estimate of genome length for males {1983.7 cM [Kosambi mapping function (K)]} and females [1339.5 cM(K)]. The integration of individual maps allows for the synthesis of genetic information from independent sources onto a single consensus map and facilitates the consolidation of linkage groups to represent the chromosomes (n = 12) of loblolly pine. The resulting consensus map consists of 357 unique molecular markers and covers ∼1300 cM(K).

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Contrasting genotypes, soil amendments, and their interactive effects on short-term total soil CO2 efflux in a 3-year-old Pinus taeda L. plantation

Soil Biology and Biochemistry ◽

10.1016/j.soilbio.2013.10.050 ◽

2014 ◽

Vol 69 ◽

pp. 93-100 ◽

Cited By ~ 5

Author(s):

Michael C. Tyree ◽

John R. Seiler ◽

Chris A. Maier

Keyword(s):

Pinus Taeda ◽

Soil Amendments ◽

Soil Co2 Efflux ◽

Interactive Effects ◽

Co2 Efflux ◽

Soil Co2 ◽

Short Term ◽

Total Soil ◽

Pinus Taeda L

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Long-term effects of stand density management and genotype on wood properties of loblolly pine (Pinus taeda L.) in the mid-South USA

Forest Ecology and Management ◽

10.1016/j.foreco.2021.119176 ◽

2021 ◽

Vol 491 ◽

pp. 119176

Author(s):

Michael A. Blazier ◽

Thomas Hennessey ◽

Laurence Schimleck ◽

Scott Abbey ◽

Ryan Holbrook ◽

...

Keyword(s):

Pinus Taeda ◽

Loblolly Pine ◽

Stand Density ◽

Wood Properties ◽

Long Term Effects ◽

Stand Density Management ◽

Pinus Taeda L

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Comparative Dynamics of Above-Ground Litter Production and Decomposition from Eucalyptus Grandis Hill ex Maiden and Pinus Taeda L., and Their Contribution to Soil Organic Carbon

Forests ◽

10.3390/f12030349 ◽

2021 ◽

Vol 12 (3) ◽

pp. 349

Author(s):

Andrés Baietto ◽

Jorge Hernández ◽

Amabelia del Pino

Keyword(s):

Pinus Taeda ◽

Decomposition Rate ◽

Methodological Approach ◽

Eucalyptus Grandis ◽

Isotopic Analysis ◽

Forest Litter ◽

First Year ◽

Litter Production ◽

Forest Species ◽

Pinus Taeda L

The replacement of native pasture by exotic commercial forest species is an infrequent situation worldwide. In these systems, a new component is introduced, forest litter, which constitutes one of the main ways of incorporating carbon into the soil–plant system. The present work seeks to establish a methodological approach to study the dynamics of litter production and decomposition in an integrated way. The general objective was to characterize and compare the litter production dynamics in 14-year-old Eucalyptus grandis Hill ex Maiden and Pinus taeda L. commercial plantations. During two years, seasonal evaluations of fall, decomposition and accumulation of litter were carried out in stands of both species. In turn, the contribution of carbon from forest species to the soil through isotopic analysis techniques was quantified. Litterfall in E. grandis showed maximums during the spring of the first year and in the spring and summer of the second. In P. taeda, the maximums occurred in summer of the first year and in autumn of the second. In relation to the decomposition rate, the results based on short periods of evaluation between 15 and 21 months did not show differences between species, nor for the different moments of beginning of the evaluation, obtaining average values of 0.0369 month−1 for E. grandis and 0.0357 month−1 for P. taeda. In turn, both the decomposition rate of the material as a whole and the estimates of accumulated biomass in equilibrium state did not show significant differences between the species. Additionally, there was a relevant incorporation of carbon into the soil by forest species, fundamentally in the first few centimeters, substituting an important proportion of the carbon inherited by the original cover of native pastures. Finally, it is necessary to specify that the scope of the findings obtained is greatly limited by the sample size used in this study.

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