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Diversity in plant hydraulic traits explains seasonal and inter-annual variations of vegetation dynamics in seasonally dry tropical forests

Xiangtao Xu, David Medvigy, Jennifer S. Powers, Justin M. Becknell, Kaiyu Guan
2016 New Phytologist  
We assessed whether diversity in plant hydraulic traits can explain the observed diversity in plant responses to water stress in seasonally dry tropical forests (SDTFs).  ...  The updated model generated realistic plant hydraulic dynamics, such as leaf water potential and stem sap flow.  ...  Acknowledgements The authors gratefully acknowledge support from a National Science Foundation CAREER Award DEB-1053237 (to J.S.P.), the US Department of Energy, Office of Science, Office of Biological  ... 
doi:10.1111/nph.14009 pmid:27189787 fatcat:h2ffouz4ejeedmr2quuntdaxea

Improved SWAT vegetation growth module for tropical ecosystem

Tadesse Alemayehu, Ann van Griensven, Willy Bauwens
2017 Hydrology and Earth System Sciences Discussions  
Our goal is to improve the vegetation growth module of the SWAT model for simulating the vegetation parameters such as the leaf area index (LAI) for tropics.  ...  (PET) – to initiate a new growing season after a defined dry season.  ...  The total number of heat units required for a 129 plant to reach maturity must be provided by the user that is calculated: The plant growth modeling in SWAT includes simulation of the leaf area development  ... 
doi:10.5194/hess-2017-104 fatcat:4u6zh2nchjak5iswtupvmqrh2i

Complete or over‐compensatory thermal acclimation of leaf dark respiration in African tropical trees

Myriam Mujawamariya, Maria Wittemann, Aloysie Manishimwe, Bonaventure Ntirugulirwa, Etienne Zibera, Donat Nsabimana, Göran Wallin, Johan Uddling, Mirindi Eric Dusenge
2020 New Phytologist  
Tropical climates are getting warmer, with pronounced dry periods in large areas.  ...  The productivity and climate feedbacks of future tropical forests depend on the ability of trees to acclimate their physiological processes, such as leaf dark respiration (Rd ), to these new conditions  ...  Leaf respiration responses to rising temperature and seasonal drought The effect of temperature on leaf dark respiration In tropical forests, leaf Rd constitute a high proportion of the total plant respiration  ... 
doi:10.1111/nph.17038 pmid:33113226 fatcat:bnffzuhff5e6ji4lmjthe7hzea

An improved SWAT vegetation growth module and its evaluation for four tropical ecosystems

Tadesse Alemayehu, Ann van Griensven, Befekadu Taddesse Woldegiorgis, Willy Bauwens
2017 Hydrology and Earth System Sciences  
Our goal is to improve the vegetation growth module of SWAT for simulating the vegetation variables – such as the leaf area index (LAI) – for tropical ecosystems.  ...  However, SWAT has limitations in simulating the seasonal growth cycles for trees and perennial vegetation in the tropics, where rainfall rather than temperature is the dominant plant growth controlling  ...  We also would like to thank the Water Resource Management Authority (WRMA) of Kenya for the provision of streamflow data.  ... 
doi:10.5194/hess-21-4449-2017 fatcat:ugnamq3d2vabffopkqvo7cs32m

Seasonal leaf dynamics for tropical evergreen forests in a process-based global ecosystem model

M. De Weirdt, H. Verbeeck, F. Maignan, P. Peylin, B. Poulter, D. Bonal, P. Ciais, K. Steppe
2012 Geoscientific Model Development  
We conclude that we introduced a realistic and generic litterfall dynamics scheme, but that other processes need to be improved in the model to achieve better simulations of GPP seasonal patterns for tropical  ...  </strong> The influence of seasonal phenology on canopy photosynthesis in tropical evergreen forests remains poorly understood, and its representation in global ecosystem models is highly simplified, typically  ...  Wofsy for making the eddy flux and leaf litterfall data of the Tapajós km 67 site available at the Oak Ridge National Laboratory Distributed Active Archive Center.  ... 
doi:10.5194/gmd-5-1091-2012 fatcat:25riis7hkvb27cczvjlhl2ov7i

Seasonal leaf dynamics for tropical evergreen forests in a process based global ecosystem model

M. De Weirdt, H. Verbeeck, F. Maignan, P. Peylin, B. Poulter, D. Bonal, P. Ciais, K. Steppe
2012 Geoscientific Model Development Discussions  
We conclude that we introduced a realistic and generic litterfall dynamics scheme, but that other processes need to be improved in the model to achieve better simulations of GPP seasonal patterns for tropical  ...  The influence of seasonal phenology on canopy photosynthesis in tropical evergreen forests remains poorly understood, and its representation in global ecosystem models is highly simplified, typically with  ...  Wofsy for making the eddy flux and leaf litterfall data of the Tapajós km 67 site available at the Oak Ridge National Laboratory Distributed Active Archive Center.  ... 
doi:10.5194/gmdd-5-639-2012 fatcat:pxmm3e5z5jfhvmsg2jqissurwq

Amazon forest structure generates diurnal and seasonal variability in light utilization

Douglas C. Morton, Jérémy Rubio, Bruce D. Cook, Jean-Philippe Gastellu-Etchegorry, Marcos Longo, Hyeungu Choi, Maria Hunter, Michael Keller
2016 Biogeosciences  
</strong> The complex three-dimensional (3-D) structure of tropical forests generates a diversity of light environments for canopy and understory trees.  ...  Our findings highlight how directional illumination and forest 3-D structure combine to influence diurnal and seasonal variability in light utilization, independent of further changes in leaf area, leaf  ...  In tropical forests, branches may account for one-third of the total aboveground biomass (Higuchi et al., 1998 ), yet few ecosystem models realistically account for the roles of branches and stem material  ... 
doi:10.5194/bg-13-2195-2016 fatcat:gl3x74scpjay3itosjbxf4bxhi

Amazon forest structure generates diurnal and seasonal variability in light utilization

D. C. Morton, J. Rubio, B. D. Cook, J.-P. Gastellu-Etchegorry, M. Longo, H. Choi, M. O. Hunter, M. Keller
2015 Biogeosciences Discussions  
The complex three-dimensional (3-D) structure of tropical forests generates a diversity of light environments for canopy and understory trees.  ...  Our findings highlight how directional illumination and forest 3-D structure combine to influence diurnal and seasonal variability in light utilization, independent of further changes in leaf area, leaf  ...  In tropical forests, branches may account for one-third of the total aboveground biomass (Higuchi et al., 1998 ), yet few ecosystem models realistically account for the roles of branches and stem material  ... 
doi:10.5194/bgd-12-19043-2015 fatcat:i3kon2mdlvbmnkv6bgac2yvb7i

Biophysical homoeostasis of leaf temperature: A neglected process for vegetation and land-surface modelling

N. Dong, I. C. Prentice, S. P. Harrison, Q. H. Song, Y. P. Zhang
2017 Global Ecology and Biogeography  
a tropical seasonal forest.  ...  We encourage consideration of leaf-and canopy-to-air temperature 28 differences (ΔΤ) as a benchmark for land-surface modelling, and an important feature 29 of plant and ecosystem function. 30 Location  ...  Diurnal time courses of the canopy-to-air temperature difference (ΔΤ, K) and 558 canopy temperature during the dry season (January 2013) in a continuous tropical 559 seasonal forest (Xishuangbanna Tropical  ... 
doi:10.1111/geb.12614 fatcat:6t3kogriuba3va5mxf2puu5ety

Modeling biogenic emissions of isoprene: exploration of model drivers, climate control algorithms, and use of global satellite observations

Christopher S. Potter, Susan E. Alexander, Joseph C. Coughlan, Steven A. Klooster
2001 Atmospheric Environment  
The NASA-CASA model results indicate that the annual isoprene flux from terrestrial plant sources is 559 Tg C: Three ecosystem types, broadleaf evergreen forest, dry tropical forest, and wooded grassland  ...  An improved global budget for isoprene emissions from terrestrial vegetation sources is fundamental to a better understanding of the oxidative capacity of the lower atmosphere and changes in the concentration  ...  We thank Alex Guenther for assistance in model algorithm development.  ... 
doi:10.1016/s1352-2310(01)00390-9 fatcat:wbxzdibvdvg57btgvmcunsb46y

Trait Acclimation Mitigates Mortality Risks of Tropical Canopy Trees under Global Warming

Frank Sterck, Niels P. R. Anten, Feike Schieving, Pieter A. Zuidema
2016 Frontiers in Plant Science  
We call for incorporating trait acclimation in field and experimental studies of plant functional traits, and in models that predict responses of tropical forests to climate change.  ...  Our model estimated the maximum effect of acclimation when trees optimize traits that are strongly plastic on a week to annual time scale (leaf photosynthetic capacity, total leaf area, stem sapwood area  ...  AUTHOR CONTRIBUTIONS All authors contributed to designing this study, drafting and revising the work. FS and FSc developed the plant model used and FS carried out the analysis for this study.  ... 
doi:10.3389/fpls.2016.00607 pmid:27242814 pmcid:PMC4863428 fatcat:qd5wf5ml7zfr5lgq7tzpb72ype

The biophysics, ecology, and biogeochemistry of functionally diverse, vertically- and horizontally-heterogeneous ecosystems: the Ecosystem Demography Model, version 2.2 – Part 2: Model evaluation

Marcos Longo, Ryan G. Knox, Naomi M. Levine, Abigail L. S. Swann, David M. Medvigy, Michael C. Dietze, Yeonjoo Kim, Ke Zhang, Damien Bonal, Benoit Burban, Plinio B. Camargo, Matthew N. Hayek (+5 others)
2019 Geoscientific Model Development Discussions  
on energy, water, and carbon cycles, as well as the priority areas for further model development.  ...  We also identified some of the model limitations, such as the model's tendency to overestimate the magnitude and seasonality of heterotrophic respiration, and to overestimate growth rates in a nutrient-poor  ...  The research was partially carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.  ... 
doi:10.5194/gmd-2019-71 fatcat:udlfsuzddzhd7bh2mx5u5l7gt4

The biophysics, ecology, and biogeochemistry of functionally diverse, vertically and horizontally heterogeneous ecosystems: the Ecosystem Demography model, version 2.2 – Part 2: Model evaluation for tropical South America

Marcos Longo, Ryan G. Knox, Naomi M. Levine, Abigail L. S. Swann, David M. Medvigy, Michael C. Dietze, Yeonjoo Kim, Ke Zhang, Damien Bonal, Benoit Burban, Plínio B. Camargo, Matthew N. Hayek (+5 others)
2019 Geoscientific Model Development  
We also identified several limitations, including the model's tendency to overestimate the magnitude and seasonality of heterotrophic respiration and to overestimate growth rates in a nutrient-poor tropical  ...  We also identify several priorities for further model development.  ...  Additional measurements of leaf and wood heat capacity for tropical forests could improve the accuracy of leaf and branch temperatures in the model.  ... 
doi:10.5194/gmd-12-4347-2019 fatcat:lnqpqryxhvfgpbbxc2ddwmp3z4

Contrasting leaf phenological strategies optimize carbon gain under droughts of different duration

S. Manzoni, G. Vico, S. Thompson, F. Beyer, M. Weih
2015 Advances in Water Resources  
Here we consider these theories in a unified framework using the same set of equations to describe gas exchanges and water transport in the soil-plant-atmosphere continuum, and quantify the effect of the  ...  to avoid water potentials with negative impacts on A net; (iii) a constant leaf water potential is maintained (isohydric behavior); and (iv) leaf area remains unaltered (i.e., summer-evergreen leaf habit  ...  We acknowledge partial support from the Faculty of Natural Resources and Agricultural Sciences and the vice-chancellor of the Swedish University of Agricultural Sciences, and from the US National Science  ... 
doi:10.1016/j.advwatres.2015.08.001 fatcat:kbswvdj2y5dbvbwdle7yyrnzwm

Evidence for strong seasonality in the carbon storage and carbon use efficiency of an Amazonian forest

Lucy Rowland, Timothy Charles Hill, Clement Stahl, Lukas Siebicke, Benoit Burban, Joana Zaragoza-Castells, Stephane Ponton, Damien Bonal, Patrick Meir, Mathew Williams
2014 Global Change Biology  
changes in the net carbon flux of tropical forests remains poorly quantified by both modelling and field studies.  ...  The resulting analysis quantifies, with uncertainty estimates, the seasonal changes in the net carbon flux of a tropical rainforest which experiences a pronounced dry season.  ...  Reay for their help and support, as well as two anonymous reviewers for their contributions. This study was part of the GUYAFLUX project funded by the French Ministry  ... 
doi:10.1111/gcb.12375 pmid:23996917 pmcid:PMC4298765 fatcat:nuupboiobjaejixzcc5w54jo4u
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