Search

Your search keyword '"Griffin K.L."' showing total 17 results
Start Over Author "Griffin K.L."
17 results on '"Griffin K.L."'

3. Leaf photosynthesis, photorespiration, and respiration in papaya genotypes (Carica papaya L.) with different leaf chlorophyll concentrations

Author

Paixão, J.S., primary, Ruas, K.F., additional, Aguilar, R.S., additional, Silva, J.R., additional, Rodrigues, W.P., additional, Machado Filho, J.A., additional, Abreu, D.P., additional, Bernado, W.P., additional, Ferreira, L.S., additional, Cabrera, J.A., additional, Griffin, K.L., additional, and Campostrini, E., additional

Published
2019
Full Text
View/download PDF

5. Separating species and environmental determinants of leaf functional traits in temperate rainforest plants along a soil-development chronosequence

Author

Turnbull, M.H. Griffin, K.L. Fyllas, N.M. Lloyd, J. Meir, P. Atkin, O.K.

Subjects
food and beverages
Abstract

We measured a diverse range of foliar characteristics in shrub and tree species in temperate rainforest communities along a soil chronosequence (six sites from 8 to 120000 years) and used multilevel model analysis to attribute the proportion of variance for each trait into genetic (G, here meaning species-level), environmental (E) and residual error components. We hypothesised that differences in leaf traits would be driven primarily by changes in soil nutrient availability during ecosystem progression and retrogression. Several leaf structural, chemical and gas-exchange traits were more strongly driven by G than E effects. For leaf mass per unit area (MA), foliar [N], net CO2 assimilation and dark respiration rates and foliar carbohydrate concentration, the G component accounted for 60-87% of the total variance, with the variability associated with plot, the E effect, much less important. Other traits, such as foliar [P] and N:P, displayed strong E and residual effects. Analyses revealed significant reductions in the slopes of G-only bivariate relationships when compared with raw relationships, indicating that a large proportion of trait-trait relationships is species based, and not a response to environment per se. This should be accounted for when assessing the mechanistic basis for using such relationships in order to make predictions of responses of plants to short-term environmental change.

Published
2016

6. Global variability in leaf respiration in relation to climate, plant functional types and leaf traits

Author

Atkin, O.K. Bloomfield, K.J. Reich, P.B. Tjoelker, M.G. Asner, G.P. Bonal, D. Bönisch, G. Bradford, M.G. Cernusak, L.A. Cosio, E.G. Creek, D. Crous, K.Y. Domingues, T.F. Dukes, J.S. Egerton, J.J.G. Evans, J.R. Farquhar, G.D. Fyllas, N.M. Gauthier, P.P.G. Gloor, E. Gimeno, T.E. Griffin, K.L. Guerrieri, R. Heskel, M.A. Huntingford, C. Ishida, F.Y. Kattge, J. Lambers, H. Liddell, M.J. Lloyd, J. Lusk, C.H. Martin, R.E. Maksimov, A.P. Maximov, T.C. Malhi, Y. Medlyn, B.E. Meir, P. Mercado, L.M. Mirotchnick, N. Ng, D. Niinemets, U. O'Sullivan, O.S. Phillips, O.L. Poorter, L. Poot, P. Prentice, I.C. Salinas, N. Rowland, L.M. Ryan, M.G. Sitch, S. Slot, M. Smith, N.G. Turnbull, M.H. Vanderwel, M.C. Valladares, F. Veneklaas, E.J. Weerasinghe, L.K. Wirth, C. Wright, I.J. Wythers, K.R. Xiang, J. Xiang, S. Zaragoza-Castells, J.

Abstract

Summary: Leaf dark respiration (R dark ) is an important yet poorly quantified component of the global carbon cycle. Given this, we analyzed a new global database of R dark and associated leaf traits. Data for 899 species were compiled from 100 sites (from the Arctic to the tropics). Several woody and nonwoody plant functional types (PFTs) were represented. Mixed-effects models were used to disentangle sources of variation in R dark . Area-based R dark at the prevailing average daily growth temperature (T) of each site increased only twofold from the Arctic to the tropics, despite a 20°C increase in growing T (8-28°C). By contrast, R dark at a standard T (25°C, R dark 25 ) was threefold higher in the Arctic than in the tropics, and twofold higher at arid than at mesic sites. Species and PFTs at cold sites exhibited higher R dark 25 at a given photosynthetic capacity (V cmax 25 ) or leaf nitrogen concentration ([N]) than species at warmer sites. R dark 25 values at any given V cmax 25 or [N] were higher in herbs than in woody plants. The results highlight variation in R dark among species and across global gradients in T and aridity. In addition to their ecological significance, the results provide a framework for improving representation of R dark in terrestrial biosphere models (TBMs) and associated land-surface components of Earth system models (ESMs). © 2015 New Phytologist Trust.

Published
2015

7. Light inhibition of leaf respiration as soil fertility declines along a post-glacial chronosequence in New Zealand: An analysis using the Kok method

Author

Atkin, O.K. Turnbull, M.H. Zaragoza-Castells, J. Fyllas, N.M. Lloyd, J. Meir, P. Griffin, K.L.

Abstract

Background and aims: Our study quantified variations leaf respiration in darkness (R D) and light (R L), and associated traits along the Franz Josef Glacier soil development chronosequence in New Zealand. Methods: At six sites along the chronosequence (soil age: 6, 60, 150, 500, 12,000 and 120,000 years old), we measured rates of leaf R D, R L (using Kok method), light-saturated CO2 assimilation rates (A), leaf mass per unit area (M A), and concentrations of leaf nitrogen ([N]), phosphorus ([P]), soluble sugars and starch. Results: The chronosequence was characterised by decreasing R D, R L and A, reduced [N] and [P] and increasing M A as soil age increased. Light inhibition of R occurred across the chronosequence (mean inhibition = 16 %), resulting in ratios of R L:A being lower than for R D:A. Importantly, the degree of light inhibition differed across the chronosequence, being lowest at young sites and highest at old sites. This resulted in R L:A ratios being relatively constant across the chronosequence, whereas R D:A ratios increased with increasing soil age. Log-log R-A-M A-[N] relationships remained constant along the chronosequence. By contrast, relationships linking rates of leaf R to [P] differed among leaves with low vs high [N]:[P] ratios. Slopes of log-log bivariate relationships linking R L to A, M A, [N] and [P] were steeper than that for R D. Conclusions: Our findings have important implications for predictive models that seek to account for light inhibition of R, and for our understanding of how environmental gradients impact on leaf trait relationships © 2013 Springer Science+Business Media Dordrecht.

Published
2013

16. Forest canopy hydraulic properties and catchment water balance: observations and modeling

Author

Engel, V.C., Stieglitz, M., Williams, M., and Griffin, K.L.

Subjects
*FOREST canopy ecology, *EVAPOTRANSPIRATION
Abstract

We present observations and simulations examining plant–water relations in a forested catchment characterized by strong topographic control over surface hydrology and stand structure. The system is dominated by xeric and mesic ecotypes of Quercus rubra L. Soil depths are typically very thin and the severity of seasonal water stress in these trees is determined largely by position along the local topographic gradient. Water balance related ecotypic differences in Q. rubra were measured during the 2000 growing season at an upland and lowland site. Significant site differences in stomatal conductance, sap flux density, and leaf to sapwood area ratios were observed. However, mid-day leaf water potentials and the leaf area-specific canopy hydraulic conductance were not significantly different despite a 20% increase in soil moisture content, an average 10 m increase in tree height, and a higher leaf area index at the lowland site. These results suggest a close coordination of tree morphology, stand structure, and the hydraulic conductance of the combined soil–root–leaf pathway that governs leaf-level water vapor exchange rates similarly across the topographic gradient. To place these stand-level observations in the context of catchment-scale water balance we linked the SPA canopy model with a 1-D soil column model and TOPMODEL hydrologic formulations. The SPA model was used to represent the canopy because of its specific inclusion of hydraulic constraints on transpiration and leaf water potential. The combined model is spatially explicit in the distribution of ecotype morphology, and calculates transpiration rates for TOPMODEL-derived saturated and unsaturated area fractions within the watershed separately. Model predictions of stomatal conductance, upland latent energy flux, stream discharge, and soil moisture content compared favorably with observations. Sensitivity analyses of canopy model parameters indicate stream discharge in this system is most sensitive to changes in the maximum leaf area index, the minimum leaf water potential, and belowground resistance. Discharge was least sensitive to changes in stem hydraulic conductivity and capacitance. Model results and observations are discussed with respect to adaptations to water stress, hydraulic controls on canopy water use, and ecosystem water use. [Copyright &y& Elsevier]

Published
2002
Full Text
View/download PDF

17. Global variability in leaf respiration in relation to climate, plant functional types and leaf traits

Author

Shuang Xiang, Trofim C. Maximov, Lucy Rowland, Stephen Sitch, Keith J. Bloomfield, Emanuel Gloor, Christopher H. Lusk, Danielle Creek, Nicholas Mirotchnick, Ülo Niinemets, Michael G. Ryan, Peter B. Reich, Jon Lloyd, Fernando Valladares, Joana Zaragoza-Castells, Mary A. Heskel, John J. G. Egerton, Matthew H. Turnbull, Erik J. Veneklaas, John R. Evans, Roberta E. Martin, Jens Kattge, Françoise Yoko Ishida, Kevin L. Griffin, Gerhard Bönisch, Norma Salinas, Michael J. Liddell, Desmond Ng, Jeffrey S. Dukes, Martijn Slot, Hans Lambers, Lina M. Mercado, Pieter Poot, Mark C. Vanderwel, Kirk R. Wythers, Ian J. Wright, Nicholas G. Smith, Lasantha K. Weerasinghe, Rossella Guerrieri, Chris Huntingford, Jen Xiang, Teresa E. Gimeno, Yadvinder Malhi, Paul P. G. Gauthier, Patrick Meir, Eric G. Cosio, Odhran S. O'Sullivan, Gregory P. Asner, Mark G. Tjoelker, Damien Bonal, Lucas A. Cernusak, Graham D. Farquhar, Christian Wirth, Lourens Poorter, Matt Bradford, I. Colin Prentice, Oliver L. Phillips, Tomas F. Domingues, Belinda E. Medlyn, Nikolaos M. Fyllas, Owen K. Atkin, Kristine Y. Crous, Ayal P. Maksimov, Atkin O.K., Bloomfield K.J., Reich P.B., Tjoelker M.G., Asner G.P., Bonal D., Bonisch G., Bradford M.G., Cernusak L.A., Cosio E.G., Creek D., Crous K.Y., Domingues T.F., Dukes J.S., Egerton J.J.G., Evans J.R., Farquhar G.D., Fyllas N.M., Gauthier P.P.G., Gloor E., Gimeno T.E., Griffin K.L., Guerrieri R., Heskel M.A., Huntingford C., Ishida F.Y., Kattge J., Lambers H., Liddell M.J., Lloyd J., Lusk C.H., Martin R.E., Maksimov A.P., Maximov T.C., Malhi Y., Medlyn B.E., Meir P., Mercado L.M., Mirotchnick N., Ng D., Niinemets U., O'Sullivan O.S., Phillips O.L., Poorter L., Poot P., Prentice I.C., Salinas N., Rowland L.M., Ryan M.G., Sitch S., Slot M., Smith N.G., Turnbull M.H., Vanderwel M.C., Valladares F., Veneklaas E.J., Weerasinghe L.K., Wirth C., Wright I.J., Wythers K.R., Xiang J., Xiang S., Zaragoza-Castells J., Australian National University (ANU), Hawkesbury Institute for the Environment [Richmond] (HIE), Western Sydney University, University of Minnesota [Twin Cities] (UMN), University of Minnesota System, Carnegie Institution for Science [Washington], Ecologie et Ecophysiologie Forestières [devient SILVA en 2018] (EEF), Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL), Max-Planck-Institut für Biogeochemie (MPI-BGC), CSIRO Land and Water, Commonwealth Scientific and Industrial Research Organisation [Canberra] (CSIRO), James Cook University (JCU), Pontificia Universidad Católica del Perú (PUCP), Universidade de São Paulo (USP), Purdue University [West Lafayette], National and Kapodistrian University of Athens (NKUA), Department of Geosciences [Princeton], Princeton University, School of Geography [Leeds], University of Leeds, Lamont-Doherty Earth Observatory (LDEO), Columbia University [New York], School of Geosciences [Edinburgh], University of Edinburgh, University of New Hampshire (UNH), Centre for Ecology and Hydrology [Wallingford] (CEH), Natural Environment Research Council (NERC), School of Plant Biology, Faculty of Natural and Agricultural Sciences, The University of Western Australia, The University of Western Australia (UWA), Department of Life Sciences, Imperial College London, Silwood Park Campus, Ascot, UK, University of Waikato [Hamilton], Institute of Biological Problems of the Cryolithozone, Russian Academy of Sciences [Moscow] (RAS), School of Geography and the Environment [Oxford] (SoGE), University of Oxford [Oxford], Macquarie University, College of Life and Environmental Sciences, University of Exeter, Department of Ecology and Evolutionary Biology [University of Toronto] (EEB), University of Toronto, Wageningen University and Research [Wageningen] (WUR), School of Biological Sciences, University of Canterbury, Colorado State University [Fort Collins] (CSU), Department of Biology [Gainesville] (UF|Biology), University of Florida [Gainesville] (UF), Smithsonian Tropical Research Institute, University of Regina (UR), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), University of Peradeniya, Universität Leipzig [Leipzig], Chinese Academy of Sciences [Beijing] (CAS), Western Sydney University (UWS), University of Minnesota [Twin Cities], National and Kapodistrian University of Athens = University of Athens (NKUA | UoA), School of Geography and the Environment [Oxford], Estonian University of Life Sciences, Wageningen University and Research Centre [Wageningen] (WUR), Department of Biology (University of Florida), University of Florida [Gainesville], Smithsonian Tropical Research Institute, Panama City, Republic of Panama., Consejo Superior de Investigaciones Científicas [Spain] (CSIC), and AXA Research Fund

Subjects
temperature sensitivity, Physiology, [SDV]Life Sciences [q-bio], Acclimatization, Climate, Plant Science, Photosynthesis, Aridity, Temperatures, Ecology, Respiration, Temperature, Biosphere, Plants, PE&RC, Phenotype, nitrogen concentration, Leaf nitrogen (N), Plant Leave, Life Sciences & Biomedicine, Woody plant, terrestrial carbon-cycle, thermal-acclimation, Nitrogen, Plant Biology & Botany, Cell Respiration, Climate change, Biology, FOTOSSÍNTESE, Climate model, Ecology and Environment, tropical rain-forests, Carbon cycle, Climate models, Carbon Cycle, Photosynthesi, 07 Agricultural and Veterinary Sciences, Bosecologie en Bosbeheer, Plant functional types (PFTs), elevated atmospheric co2, photosynthetic capacity, Science & Technology, Plant Sciences, Tropics, scaling relationships, Plant, 15. Life on land, Herbaceous plant, 06 Biological Sciences, Carbon Dioxide, Models, Theoretical, vegetation models, Photosynthetic capacity, Arid, Forest Ecology and Forest Management, Plant Leaves, Biology and Microbiology, 13. Climate action, dark respiration, Acclimation
Abstract

Owen K. Atkin [et al.].- Received: 8 July 2014, Accepted: 29 November 2014, Leaf dark respiration (Rdark) is an important yet poorly quantified component of the global carbon cycle. Given this, we analyzed a new global database of Rdark and associated leaf traits., Data for 899 species were compiled from 100 sites (from the Arctic to the tropics). Several woody and nonwoody plant functional types (PFTs) were represented. Mixed-effects models were used to disentangle sources of variation in Rdark., Area-based Rdark at the prevailing average daily growth temperature (T) of each site increased only twofold from the Arctic to the tropics, despite a 20°C increase in growing T (8–28°C). By contrast, Rdark at a standard T (25°C, Rdark25) was threefold higher in the Arctic than in the tropics, and twofold higher at arid than at mesic sites. Species and PFTs at cold sites exhibited higher Rdark25 at a given photosynthetic capacity (Vcmax25) or leaf nitrogen concentration ([N]) than species at warmer sites. Rdark25 values at any given Vcmax25 or [N] were higher in herbs than in woody plants., The results highlight variation in Rdark among species and across global gradients in T and aridity. In addition to their ecological significance, the results provide a framework for improving representation of Rdark in terrestrial biosphere models (TBMs) and associated land-surface components of Earth system models (ESMs).

Catalog

Books, media, physical & digital resources
See catalog results