Browsing by Author "Posada, Juan M."
Now showing items 1-20 of 20
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Carbohydrate dynamics in roots, stems, and branches after maintenance pruning in two common urban tree species of North America
Ramirez J.A.; Handa I.T.; Posada, Juan M.; Delagrange S.; Messier C.The ability of plants to tolerate stress is determined in part by the carbon allocated to their reserves. We studied two common urban tree species in northeastern North America, Acer saccharinum (Silver maple, native) and ...Artículo. 2018
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Cattle and weedy shrubs as restoration tools of tropical montane rainforest
Posada, Juan M.; Cavelier,JaimeEn los últimos 150 años, una gran proporción de los bosques de América Latina se han convertido en pastizales. Cuando se abandonan estos pastos, los pastos pueden retrasar el restablecimiento de especies leñosas y limitar ...Artículo. 2000
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Climate severity and land-cover transformation determine plant community attributes in Colombian dry forests
González-M. R.; Norden N.; Posada, Juan M.; Pizano C.; García H.; Idárraga-Piedrahita Á.; López-Camacho R.; Nieto J.; Rodríguez-M G.M.; Torres A.M.; Castaño-Naranjo A.; Jurado R.; Franke-Ante R.; Galindo-T R.; Hernández R. E.; Barbosa A.; Salgado-Negret B.Tropical dry forests (TDF) are known to be resource-limited due to a marked seasonality in precipitation. However, TDF are also shaped by factors such as solar radiation, wind speed, soil fertility, and land-cover ...Artículo. 2019
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Contributions of leaf photosynthetic capacity, leaf angle and self-shading to the maximization of net photosynthesis in Acer saccharum: a modelling assessment
Posada, Juan M.; Sievänen, Risto; Messier, Christian; Perttunen, Jari; Nikinmaa, Eero; Lechowicz, Martin J.Se espera que las plantas maximicen sus ganancias fotosintéticas netas y utilicen eficientemente los recursos disponibles, pero los principios fundamentales que rigen las compensaciones en los conjuntos de rasgos relacionados ...Artículo. 2012
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Coping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forest
Verryckt, Lore T.; Van Langenhove, Leandro; Ciais, Philippe; Courtois, Elodie A.; Vicca, Sara; Peñuelas, Josep; Stahl, Clément; Coste, Sabrina; Ellsworth, David S.; Posada, Juan M.; Obersteiner, Michael; Chave, Jérôme; Janssens, Ivan A.Measuring leaf gas exchange from canopy leaves is fundamental for our understanding of photosynthesis and for a realistic representation of carbon uptake in vegetation models. Since canopy leaves are often difficult to ...Artículo. 2020
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Dynamic cloud regimes, incident sunlight, and leaf temperatures in espeletia grandiflora and Chusquea tessellata, two representative species of the Andean Páramo, Colombia
Sanchez, Adriana; Posada, Juan M.; Smith, William K.The alpine páramo of Chingaza National Park, Colombia, has a highly variable cloud regime typical of many tropical alpine areas. Yet, little information is available regarding the effects of such dynamic sunlight regimes ...Artículo. 2014
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Effect of temporally heterogeneous light on photosynthetic light use efficiency, plant acclimation and growth in Abatia parviflora
Rey-Sanchez, Camilo; Posada, Juan M.Individual leaves have a unique instantaneous photosynthetic photon flux density (PPFD) at which net photosynthetic light use efficiency (?L, the ratio between net photosynthesis and PPFD) is maximised (PPFD?max). When ...Artículo. 2019
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Effects of elevated CO2 and defoliation on compensatory growth and photosynthesis of seedlings in a tropical tree, Copaifera aromatica
Lovelock,Catherine E.; Posada, Juan M.; Winter, Klaus; Posada, Juan M.Después de la defoliación por herbívoros, algunas plantas exhiben tasas mejoradas de fotosíntesis y crecimiento que les permiten compensar la pérdida de tejido, manteniendo así su estado físico en relación con las plantas ...Artículo. 1999
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Estimating aboveground biomass and carbon stocks in periurban Andean secondary forests using very high resolution imagery
Clerici, Nicola; Rubiano, Kristian; Abd-Elrahman, Amr; Posada, Juan M.; Escobedo, Francisco JPeriurban forests are key to offsetting anthropogenic carbon emissions, but they are under constant threat from urbanization. In particular, secondary Neotropical forest types in Andean periurban areas have a high potential ...Artículo. 2016
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Functional structural plant models - Case LIGNUM
Perttunen, Jari; Nikinmaa, Eero; Posada, Juan M.The functional structural plant models (FSPMs) can be defined as models that combine descriptions of metabolic (physiological) processes with a presentation of the 3D structure of a plant. They contain usually the following ...Documento de conferencia. 2009
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Fusion of sentinel-1a and sentinel-2A data for land cover mapping: A case study in the lower Magdalena region, Colombia
Clerici, Nicola; Calderón, Cesar Augusto Valbuena; Posada, Juan M.Land cover–land use (LCLU) classification tasks can take advantage of the fusion of radar and optical remote sensing data, leading generally to increase mapping accuracy. Here we propose a methodological approach to fuse ...Artículo. 2017
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Globally, functional traits are weak predictors of juvenile tree growth, and we do not know why
Paine, C. E. Timothy; Amissah, Lucy; Auge, Harald; Baraloto, Christopher; Baruffol, Martin; Bourland, Nils; Bruelheide, Helge; Daïnou, Kasso; Gouvenain, Roland C.; Doucet, Jean?Louis; Doust, Susan; Fine, Paul V. A.; Fortunel, Claire; Haase, Josephine; Holl, Karen D.; Jactel, Hervé; Li, Xuefei; Kitajima, Kaoru; Koricheva, Julia; Martínez?Garza, Cristina; Messier, Christian; Paquette, Alain; Philipson, Christopher; Piotto, Daniel; Poorter, Lourens; Posada, Juan M.; Potvin, Catherine; Rainio, Kalle; Russo, Sabrina E.; Ruiz?Jaen, Mariacarmen; Scherer?Lorenzen, Michael; Webb, Campbell O.; Wright, S. Joseph; Zahawi, Rakan A.; Hector, AndyPlant functional traits, in particular specific leaf area (SLA), wood density and seed mass, are often good predictors of individual tree growth rates within communities. Individuals and species with high SLA, low wood ...Artículo. 2015
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Interplay of seasonal sunlight, air and leaf temperature in two alpine páramo species, Colombian Andes
Sanchez, Adriana; Rey-Sánchez A.C.; Posada, Juan M.; Smith W.K.In models of photosynthetic gas exchange, leaf temperature (Tleaf) is often calculated using a combination of derivations of the energy balance equation and measurements of air temperature (Tair). Yet, there are frequently ...Artículo. 2018
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Monitoring ecological change during rapid socio-economic and political transitions: Colombian ecosystems in the post-conflict era
Sierra, Carlos A.; Mahecha, Miguel; Poveda, Germán; Álvarez-Dávila, Esteban; Gutierrez-Velez, Víctor H.; Reu, Björn; Feilhauer, Hannes; Anáya, Jesús; Armenteras, Dolors; Benavides, Ana M.; Buendia, Corina; Duque, Álvaro; Estupiñan-Suarez, Lina M.; González, Catalina; Gonzalez-Caro, Sebastián; Jimenez, Rodrigo; Kraemer, Guido; Londoño, Maria C.; Orrego, Sergio A.; Posada, Juan M.; Ruiz-Carrascal, Daniel; Skowronek, SandraAfter more than 50-years of armed conflict, Colombia is now transitioning to a more stable social and political climate due to a series of peace agreements between the government and different armed groups. Consequences ...Artículo. 2017
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Near-infrared spectroscopy (NIRS) predicts non-structural carbohydrate concentrations in different tissue types of a broad range of tree species
Ramirez, Jorge A.; Posada, Juan M.; Handa, I. Tanya; Hoch, Günter; Vohland, Michael; Messier, Christian; Reu, BjörnThe allocation of non-structural carbohydrates (NSCs) to reserves constitutes an important physiological mechanism associated with tree growth and survival. However, procedures for measuring NSC in plant tissue are expensive ...Artículo. 2015
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Norway maple displays greater seasonal growth and phenotypic plasticity to light than native sugar maple
Paquette, Alain; Fontaine, Bastien; Berninger, Frank; Dubois, Karine; Lechowicz, Martin J.; Messier, Christian; Posada, Juan M.; Valladares, Fernando; Brisson, JacquesNorway maple (Acer platanoides L), which is among the most invasive tree species in forests of eastern North America, is associated with reduced regeneration of the related native species, sugar maple (Acer saccharum Marsh) ...Artículo. 2012
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Optimal photosynthetic use of light by tropical tree crowns achieved by adjustment of individual leaf angles and nitrogen content
Posada, Juan M.; Lechowicz, Martin J.; Kitajima, KaoruBackground and Aims Theory for optimal allocation of foliar nitrogen (ONA) predicts that both nitrogen concentration and photosynthetic capacity will scale linearly with gradients of insolation within plant canopies. ONA ...Artículo. 2009
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Relationships among precipitation regime, nutrient availability, and carbon turnover in tropical rain forests
Posada, Juan M.; Schuur E.A.G.The effect of high precipitation regime in tropical forests is poorly known despite indications of its potentially negative effects on nutrient availability and carbon (C) cycling. Our goal was to determine if there was ...Artículo. 2011
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Spatial and seasonal variation in leaf temperature within the canopy of a tropical forest
Rey-Sánchez A.C.; Slot M.; Posada, Juan M.; Kitajima K.Understanding leaf temperature (Tleaf) variation in the canopy of tropical forests is critical for accurately calculating net primary productivity because plant respiration and net photosynthesis are highly sensitive to ...Artículo. 2016
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Universidad y sociedad. Extensión del conocimiento
Gutiérrez-Rodríguez, Alejandro; Mejía-Pardo, Francisco; Silva-Lizarazo, Diana María; Garzón-Díaz, Karim; Isaza-Restrepo, Andres; Morales-Piedrahita, Mónica; Enriquez Guerrero, Carolina Lucero; Latorre-Santos, Catalina; Camargo Rojas, Diana Alexandra; Santacruz-González, ML; Salamanca-Matta, Alba Lucía; Ramírez-Clavijo, Sandra; Fayad-Naffah, Ramón; Posada, Juan M.; Fajardo Tiriath, Dalila; Cardona, Diego; Rodríguez, Gloria Amparo; Yheny-Erika, Jiménez; Rodríguez-Carrasco, Gloribel Lucía; Gutiérrez-Rodríguez, Alejandro; Rodríguez-Zárate, Claudia PatriciaEste libro hace un análisis de la educación y propone migrar de una institución educativa a una organización de extensión del conocimiento (Mejía, 2011) toma más fuerza cada día, ya que obtiene una participación más ...Libro. 2012