Consulta: subjectFacets:"Allometric equations"
Registros recuperados: 9
Data/hora: 12/06/2024 15:30:37

Almacenamiento de carbono en bosques manejados de Pinus patula en el Ejido La Mojonera, Zacualtipán, Hidalgo
Provedor de dados: 32
Autores: Figueroa Navarro, Consuelo Marisel.
La cantidad de biomasa se puede emplear para comparar la estructura y atributos funcionales de los ecosistemas forestales en condiciones climáticas similares. Con el objetivo de estimar la cantidad de biomasa y carbono (C) contenidos en rodales manejados de Pinus patula, se realizó este estudio en La Mojonera, Hidalgo. Este Ejido cuenta con programa de manejo en donde se aplica el método de regeneración de Árboles padres. El área está dividida en rodales señalados con la anualidad en la que se aplicó la corta. Para estimar la biomasa se ajustaron ecuaciones simultáneas para los componentes estructurales (fuste, ramas, follaje, corteza) a partir de la cosecha y pesaje de 18 individuos. Las ecuaciones obtenidas fueron: biomasa total, Bt = 5338.610 + 18.634...
Palavras-chave: Análisis de regresión; Biomasa; Bosque manejado; Captura de carbono; Ecuaciones alométricas; Pinus patula; Allometric equations; Biomass; Carbon capture; Managed forest; Maestría; Forestal.
Ano: 2010
URL: http://hdl.handle.net/10521/95

Estimación de volumen, biomasa y carbono aéreo en tres especies arbóreas de Pluma Hidalgo, Oaxaca.
Provedor de dados: 32
Autores: Aquino Ramírez, Martín.
Los reservorios y el potencial de almacenamiento de la cantidad biomasa y carbono se desconocen en la mayoría de los bosques tropicales de México, por lo que es importante realizar estimaciones precisas mediante el desarrollo de ecuaciones alométricas para conocer su variación espacial y temporal presente en los ecosistemas forestales. El presente estudio se realizó en el municipio de Pluma Hidalgo, Oaxaca, México, perteneciente a la región fisiográfica de la Sierra Madre del Sur, con el objetivo de desarrollar ecuaciones para estimar volumen comercial, biomasa y carbono aéreo total en las especies Cupania dentata DC., Alchornea latifolia Sw. e Inga punctata Willd. Se aplicó un muestreo destructivo a 48 árboles de los que se obtuvieron muestras de los...
Palavras-chave: Árboles tropicales; Análisis de regresión; Variable indicadora; Ecuaciones alométricas; Concentración de carbono; Tropical trees; Regression analysis; Indicator variable; Allometric equations; Carbon concentration; Ciencias Forestales; Maestría.
Ano: 2014
URL: http://hdl.handle.net/10521/2333

Almacenamiento de carbono en bosques manejados de Pinus patula en el Ejido La Mojonera, Zacualtipán, Hidalgo
Provedor de dados: 32
Autores: Figueroa Navarro, Consuelo Marisel.
La cantidad de biomasa se puede emplear para comparar la estructura y atributos funcionales de los ecosistemas forestales en condiciones climáticas similares. Con el objetivo de estimar la cantidad de biomasa y carbono (C) contenidos en rodales manejados de Pinus patula, se realizó este estudio en La Mojonera, Hidalgo. Este Ejido cuenta con programa de manejo en donde se aplica el método de regeneración de Árboles padres. El área está dividida en rodales señalados con la anualidad en la que se aplicó la corta. Para estimar la biomasa se ajustaron ecuaciones simultáneas para los componentes estructurales (fuste, ramas, follaje, corteza) a partir de la cosecha y pesaje de 18 individuos. Las ecuaciones obtenidas fueron: biomasa total, Bt = 5338.610 + 18.634...
Palavras-chave: Análisis de regresión; Biomasa; Bosque manejado; Captura de carbono; Ecuaciones alométricas; Pinus patula; Allometric equations; Biomass; Carbon capture; Managed forest; Maestría; Forestal.
Ano: 2010
URL: http://hdl.handle.net/10521/95

Individual plant and population biomass of dominant shrubs in Patagonian grazed fields
Provedor de dados: 67
Autores: Oñatibia,Gastón R; Aguiar,Martín R; Cipriotti,Pablo A; Troiano,Fernando.
Estimating aboveground biomass of vegetation is essential for population, community and ecosystem studies. In systems dominated or co-dominated by woody species, biomass estimation is difficult, and rapid and non-destructive methods are needed. In this study, we describe biomass distribution in different components (i.e., wood, leaves) and how this changes with shrub size for the three dominant species of shrubs in the Occidental District of the Patagonian steppe. We also describe the population size structure of the three species in grazed fields and estimate their contribution to total abundance and biomass through a non-destructive method. We developed allometric equations to estimate aboveground biomass components of individual shrubs from structural...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adesmia volckmannii; Allometric equations; Mulinum spinosum; Semi-arid ecosystems; Senecio filaginoides; Woody species.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2010000300006

Arbuscular mycorrhizal inoculation increases biomass of Euterpe edulis and Archontophoenix alexandrae after two years under field conditions
Provedor de dados: 90
Autores: Sgrott,Andressa Franzoi; Booz,Maristela R.; Pescador,Rosete; Heck,Teresinha Catarina; Stürmer,Sidney Luiz.
Inoculation with arbuscular mycorrhizal fungi (AMF) of tree seedlings in the nursery is a biotechnological strategy to improve growth, survival after transplanting, biomass production and to reduce the use of fertilizers. Archontophoenix alexandrae and Euterpe edulis are palm species used in southern Brazil to produce the palm heart, the latter being included in the list of threatened species due to the overexploitation of its native population. The purpose of this paper was to evaluate the effect of mycorrhizal inoculation on growth and physiological parameters of A. alexandrae and E. edulis. After germination, the seedlings were inoculated (AMF) or not (CTL) with AMF in the treatments. Values of chlorophyll content, biomass and shoot phosphorus were not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palm species; Soluble carbohydrates; Plant carbon; Field inoculation; Allometric equations.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000400005

Biomass equations for forest regrowth in the eastern Amazon using randomized branch sampling
Provedor de dados: 36
Autores: Ducey,Mark Jonathan; Zarin,Daniel Jacob; Vasconcelos,Steel Silva; Araújo,Maristela Machado.
Forest regrowth occupies an extensive and increasing area in the Amazon basin, but accurate assessment of the impact of regrowth on carbon and nutrient cycles has been hampered by a paucity of available allometric equations. We develop pooled and species-specific equations for total aboveground biomass for a study site in the eastern Amazon that had been abandoned for 15 years. Field work was conducted using randomized branch sampling, a rapid technique that has seen little use in tropical forests. High consistency of sample paths in randomized branch sampling, as measured by the standard error of individual paths (14%), suggests the method may provide substantial efficiencies when compared to traditional procedures. The best fitting equations in this...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Allometric equations; Secondary growth; Tropical forest.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672009000200013

New invariants and dimensionless numbers: futile renaissance of old fallacies?
Provedor de dados: 48
Autores: NESPOLO,ROBERTO F.
The necessity of the mathematical description of living processes and the recent advances in theoretical syntheses that fit surprisingly well with real data have led many scientists to experiment with new "generalizations," beginning with allometric equations. I present here, briefly, why caution is needed when allometric equations are multiplied or divided to make new ones. This practice is flawed by old and recognized problems, such as the fallacy of averages combined with misunderstandings that include error propagation, misuse of statistics and confounding scale.
Tipo: Journal article
Palavras-chave: Fallacy of averages; Dimensional analysis; Invariants; Allometric equations; Error term.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000100004

Time in physics and biology
Provedor de dados: 48
Autores: GÜNTHER,BRUNO; MORGADO,ENRIQUE.
In contrast with classical physics, particularly with Sir Isaac Newton, where time is a continuous function, generally valid, eternally and evenly flowing as an absolute time dimension, in the biological sciences, time is in essence of cyclical nature (physiological periodicities), where future passes to past through an infinitely thin boundary, the present. In addition, the duration of the present (DP) leads to the so-called 'granulation of time' in living beings, so that by the fusion of two successive pictures of the world, which are not entirely similar, they attain the perception of 'movement,' both in the real world as well as in the sham-movement in the mass media (TV).
Tipo: Journal article
Palavras-chave: Allometric equations; Biological time; Body mass; Physical time; Theory of biological similitude.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000500005

Homeostasis and Heterostasis: from Invariant to Dimensionless Numbers
Provedor de dados: 48
Autores: GÜNTHER,BRUNO; MORGADO,ENRIQUE; JIMÉNEZ,RAÚL F.
In the present paper we have examined the applicability of dimensionless and invariant numbers (DN &amp;amp; IN) to the analysis of the cardiovascular system of mammals, whose functions were measured at standard metabolic conditions. The calculated IN did not change when we compared these figures with those obtained in dogs while they were submitted to graded exercise on a treadmill. In both instances, rest and exercise, the constancy of the IN prevailed, in accordance with Cannon's principle of "homeostasis" (1929). On the contrary, when dogs were examined during a standardized hypovolemic shock, we observed a breakdown of the IN, and the resulting DN evolved as a reliable index of the condition of "heterostasis" as defined by H. Selye. The robustness of...
Tipo: Journal article
Palavras-chave: Dimensional analysis; Biological similarities; Allometric equations; Rest and exercise; Hemorrhagic shock; Integral feedback.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000200011