Book ChapterDOI
A Model Predicting Stomatal Conductance and its Contribution to the Control of Photosynthesis under Different Environmental Conditions
J. Timothy Ball,Ian E. Woodrow,Joseph A. Berry +2 more
- pp 221-224
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TLDR
In this article, a linear correlation between stomatal conductance (g) and CO2 assimilation rate (A) has been reported when photon fluence was varied and when the photosynthetic capacity of leaves was altered by growth conditions, provided CO2, air humidity and leaf temperature were constant.Abstract:
In the past, stomatal responses have generally been considered in relation to single environmental variables in part because the interactions between factors have appeared difficult to quantify in a simple way A linear correlation between stomatal conductance (g) and CO2 assimilation rate (A) has been reported when photon fluence was varied and when the photosynthetic capacity of leaves was altered by growth conditions, provided CO2, air humidity and leaf temperature were constant (1) Temperature and humidity are, however, not consistent in nature Lack of a concise description of stomatal responses to combinations of environmental factors has limited attempts to integrate these responses into quantitative models of leaf energy balance, photosynthesis, and transpiration Moreover, this lack has hindered progress toward understanding the stomatal mechanism We have taken a multi-variant approach to the study of stomatal conductance and we show that under many conditions the responses of stornata can be described by a set of linear relationships This model can be linked to models of leaf carbon metabolism and the environment to predict fluxes of CO2, H2O and energy In this paper, we show how the model of conductance can be linked to a description of CO2 assimilation as a function of intercellular CO2 (whether empirical or the output of a model) to predict the distribution of flux control between the stornata and leaf “biochemistry” under conditions in a gas-exchange cuvetteread more
Citations
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Journal ArticleDOI
Investigating soil moisture-climate interactions in a changing climate: A review
Sonia I. Seneviratne,T. Corti,Edouard Davin,Martin Hirschi,Eric B. Jaeger,Irene Lehner,Boris Orlowsky,Adriaan J. Teuling +7 more
TL;DR: In this paper, the authors provide a synthesis of past research on the role of soil moisture for the climate system, based both on modelling and observational studies, focusing on soil moisture-temperature and soil moistureprecipitation feedbacks, and their possible modifications with climate change.
Journal ArticleDOI
Climate–Carbon Cycle Feedback Analysis: Results from the C4MIP Model Intercomparison
Pierre Friedlingstein,Peter M. Cox,Richard Betts,Laurent Bopp,W. von Bloh,Victor Brovkin,Patricia Cadule,Scott C. Doney,Michael Eby,Inez Fung,Govindasamy Bala,Jasmin John,Chris D. Jones,Fortunat Joos,Tomomichi Kato,Michio Kawamiya,Wolfgang Knorr,Keith Lindsay,H. D. Matthews,H. D. Matthews,Thomas Raddatz,Peter Rayner,Christian Reick,Erich Roeckner,K.-G. Schnitzler,Reiner Schnur,K. M. Strassmann,Andrew J. Weaver,Chisato Yoshikawa,Ning Zeng +29 more
TL;DR: In this article, eleven coupled climate-carbon cycle models were used to study the coupling between climate change and the carbon cycle. But, there was still a large uncertainty on the magnitude of these sensitivities.
Journal ArticleDOI
A dynamic global vegetation model for studies of the coupled atmosphere-biosphere system
Gerhard Krinner,Nicolas Viovy,Nathalie de Noblet-Ducoudré,Jérôme Ogée,Jérôme Ogée,Jan Polcher,Pierre Friedlingstein,Philippe Ciais,Stephen Sitch,I. Colin Prentice +9 more
Abstract: This work presents a new dynamic global vegetation model designed as an extension of an existing surface-vegetation-atmosphere transfer scheme which is included in a coupled ocean-atmosphere general circulation model. The new dynamic global vegetation model simulates the principal processes of the continental biosphere influencing the global carbon cycle (photosynthesis, autotrophic and heterotrophic respiration of plants and in soils, fire, etc.) as well as latent, sensible, and kinetic energy exchanges at the surface of soils and plants. As a dynamic vegetation model, it explicitly represents competitive processes such as light competition, sapling establishment, etc. It can thus be used in simulations for the study of feedbacks between transient climate and vegetation cover changes, but it can also be used with a prescribed vegetation distribution. The whole seasonal phenological cycle is prognostically calculated without any prescribed dates or use of satellite data. The model is coupled to the IPSL-CM4 coupled atmosphere-ocean-vegetation model. Carbon and surface energy fluxes from the coupled hydrology-vegetation model compare well with observations at FluxNet sites. Simulated vegetation distribution and leaf density in a global simulation are evaluated against observations, and carbon stocks and fluxes are compared to available estimates, with satisfying results.
Journal ArticleDOI
The response of photosynthesis and stomatal conductance to rising [CO2]: mechanisms and environmental interactions.
TL;DR: Improved understanding of the molecular and biochemical mechanisms by which plants respond to elevated [CO2], and the feedback of environmental factors upon them, will improve the ability to predict ecosystem responses to rising [ CO2] and increase the potential to adapt crops and managed ecosystems to future atmospheric [CO 2].
Journal ArticleDOI
Stable Isotopes in Plant Ecology
TL;DR: How isotope measurements associated with the critical plant resources carbon, water, and nitrogen have helped deepen the understanding of plant-resource acquisition, plant interactions with other organisms, and the role of plants in ecosystem studies is reviewed.
References
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Journal ArticleDOI
Partitioning stomatal and non‐stomatal limitations to photosynthesis
TL;DR: The techniques that have been used for quantifying the relative importance of component processes in limiting net assimilation rate are reviewed and related to a fundamental definition based on sensitivity analysis.
Journal ArticleDOI
Leaf Conductance in Relation to Assimilation in Eucalyptus pauciflora Sieb. ex Spreng: Influence of Irradiance and Partial Pressure of Carbon Dioxide.
TL;DR: Rates of assimilation and transpiration in Eucalyptus pauciflora Sieb.