Physiological and environmental regulation of stomatal conductance, photosynthesis and transpiration: a model that includes a laminar boundary layer

Collatz, G. J.; Ball, J. Timothy; Grivet, Cyril; Berry, Joseph A.

doi:10.1016/0168-1923(91)90002-8

Cited by 2,034 publications

(1,769 citation statements)

References 33 publications

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“…The general decreasing trends in VPD under cloudy and overcast conditions ( Fig. 8c) induce stomatal openness and thus enhance leaf photosynthesis (Freedman et al, 1998;Collatz et al, 1991). In addition, according to Fig.…”

Section: Effect Of Cloudsmentioning

confidence: 99%

The effects of clouds and aerosols on net ecosystem CO<sub>2</sub> exchange over semi-arid Loess Plateau of Northwest China

et al. 2010

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Abstract. The impacts of clouds and atmospheric aerosols on the terrestrial carbon cycle at semi-arid Loess Plateau in Northwest China are investigated, by using the observation data obtained at the SACOL (Semi-Arid Climate and Environment Observatory of Lanzhou University) site. Daytime (solar elevation angles of larger than 50 • ) net ecosystem exchange (NEE) of CO 2 obtained during the midgrowing season (July-August) are analyzed with respect to variations in the diffuse radiation, cloud cover and aerosol optical depth (AOD). Results show a significant impact by clouds on the CO 2 uptake by the grassland (with smaller LAI values) located in a semi-arid region, quite different from areas covered by forests and crops. The light saturation levels in the canopy are low, with a value of about 434.8 W m −2 . Thus, under overcast conditions of optically thick clouds, the CO 2 uptake increases with increasing clearness index (the ratio of global solar radiation received at the Earth surface to the extraterrestrial irradiance at a plane parallel to the Earth surface), and a maximum CO 2 uptake and light use efficiency of vegetation occur with the clearness index of about 0.37 and lower air temperature. Under other sky conditions, CO 2 uptake decreases with cloudiness but light use efficiency is enhanced, due to increased diffuse fraction of PAR. Additionally, under cloudy conditions, changes in the NEE of CO 2 also result from the interactions of many environmental factors, especially the air temperature. In contrast to its response to changes in solar radiation, the carbon uptake shows a slightly negative response to increased AOD. The reason for the difference in the response of the semi-arid grassland from that of the forest and crop lands may be due to the difference in the canopy's architectural structure.

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Section: Effect Of Cloudsmentioning

confidence: 99%

The effects of clouds and aerosols on net ecosystem CO<sub>2</sub> exchange over semi-arid Loess Plateau of Northwest China

et al. 2010

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“…For the FWD, the forcing variables include measured incident radiation, mean streamwise velocity component, mean air temperature, mean CO 2 and water vapor concentrations above the canopy. The physiological and canopy attributes include leaf area density distribution along with the parameters of the Collatz et al [6] model as described in Lai et al [18,19]. Comparisons between the modeled fluxes and eddy-covariance measurements at the canopy top are also discussed.…”

Section: Resultsmentioning

confidence: 99%

“…The stomatal conductance G s ð¼ r À1 s Þ is computed by linking G s to leaf photosynthesis (A n ), relative humidity (rh) and CO 2 concentration at the leaf surface (c c s ), as described by Ball et al [4] and Collatz et al [6], and is given by…”

Section: Canveg Fwdmentioning

confidence: 99%

Quantifying net ecosystem exchange by multilevel ecophysiological and turbulent transport models

Siqueira

Katul

Lai

2002

Advances in Water Resources

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To quantify the interplay between scalar sources and sinks (S c ) and net ecosystem exchange (NEE), ''forward'' and ''inverse'' approaches have been proposed. The canonical form of forward approaches is a one-dimensional ecophysiological-radiative transfer scheme coupled to turbulent transport theory. In contrast, inverse approaches strictly rely on turbulent transport theory and mean scalar concentration as their primary input to infer S c and NEE. While the formulation of both approaches have evolved over the past decade, no systematic comparison between them was undertaken for the same data set, and over a wide range of atmospheric conditions. Our objective is to compare the predicted S c and NEE from these two approaches with eddy-covariance measurements. The results show that the forward method outperformed all three inverse methods for unstable and neutral conditions on short time scales ($30 min) but yielded comparable results at longer time scales. Poor agreement was obtained under stable conditions for all models. Hence, for modeling event-based flux variations, forward models are preferred. Since the forward method requires detailed knowledge of ecophysiological, drag, radiative transfer and other canopy attributes, all of which are difficult to obtain on a routine basis, a symbiotic use of forward and inverse approaches is most advantageous.

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“…It has a solid experimental basis with a linear relationship between g s and net photosynthetic rate, P N (e.g. Ball et al 1987, Di Marco et al 1990, Collatz et al 1991, Sellers et al 1992, Loreto et al 1992, Aphalo and Jarvis 1993, Leuning 1995, Kim and Lieth 2003, Tuzet et al 2003, Yu et al 2004, Messinger et al 2006, Miyazawa et al 2006, Bernacchi et al 2007, Buckley 2008, Warren 2008. The apparent simplicity of BWB model has led to its adoption by modellers working at the scale of individual leaves (e.g.…”

Section: --mentioning

confidence: 99%

“…The apparent simplicity of BWB model has led to its adoption by modellers working at the scale of individual leaves (e.g. Leuning 1990, Tenhunen et al 1990, Collatz et al 1991, Kim and Lieth 2003, Yu et al 2004, Messinger et al 2006, at the scale of canopies (Hatton et al 1992), at the landscape scale (McMurtrie et al 1992), and in some global climate models (Sellers et al 1992). However, BWB model and its subsequently revised model can not predict the irradiance (I)-response curve of g s of plant when relative humidity (h s ) and CO 2 concentration at leaf surface (C s ) are held constant.…”

Section: --mentioning

confidence: 99%

A coupled model of stomatal conductance and photosynthesis for winter wheat

Ye¹,

2008

Photosynt.

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The model couples stomatal conductance (g s ) and net photosynthetic rate (P N ) describing not only part of the curve up to and including saturation irradiance (I max ), but also the range above the saturation irradiance. Maximum stomatal conductance (g smax ) and I max can be calculated by the coupled model. For winter wheat (Triticum aestivum) the fitted results showed that maximum P N (P max ) at 600 μmol mol −1 was more than at 350 μmol mol −1 under the same leaf temperature, which can not be explained by the stomatal closure at high CO 2 concentration because g smax at 600 μmol mol −1 was less than at 350 μmol mol −1 . The irradiance-response curves for winter wheat had similar tendency, e.g. at 25 o C and 350 μmol mol −1 both P N and g s almost synchronously reached the maximum values at about 1 600 μmol m -2 s −1 . At 25 o C and 600 μmol mol −1 the I max corresponding to P max and g smax was 2 080 and 1 575 μmol m -2 s −1 , respectively.Additional key words: BWB model; irradiance; Triticum. --In the simulation of stomatal conductance (g s ), an empirical model for plant leaves by Ball et al. (1987), hereafter referred to as the BWB model, has been adopted widely in studies of ecological and physiological modelling. It has a solid experimental basis with a linear relationship between g s and net photosynthetic rate, P N (e.g. Ball et al. 1987, Di Marco et al. 1990

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Physiological and environmental regulation of stomatal conductance, photosynthesis and transpiration: a model that includes a laminar boundary layer

Cited by 2,034 publications

References 33 publications

The effects of clouds and aerosols on net ecosystem CO<sub>2</sub> exchange over semi-arid Loess Plateau of Northwest China

The effects of clouds and aerosols on net ecosystem CO<sub>2</sub> exchange over semi-arid Loess Plateau of Northwest China

Quantifying net ecosystem exchange by multilevel ecophysiological and turbulent transport models

A coupled model of stomatal conductance and photosynthesis for winter wheat

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Physiological and environmental regulation of stomatal conductance, photosynthesis and transpiration: a model that includes a laminar boundary layer

Cited by 2,034 publications

References 33 publications

The effects of clouds and aerosols on net ecosystem CO&lt;sub&gt;2&lt;/sub&gt; exchange over semi-arid Loess Plateau of Northwest China

The effects of clouds and aerosols on net ecosystem CO&lt;sub&gt;2&lt;/sub&gt; exchange over semi-arid Loess Plateau of Northwest China

Quantifying net ecosystem exchange by multilevel ecophysiological and turbulent transport models

A coupled model of stomatal conductance and photosynthesis for winter wheat

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The effects of clouds and aerosols on net ecosystem CO<sub>2</sub> exchange over semi-arid Loess Plateau of Northwest China

The effects of clouds and aerosols on net ecosystem CO<sub>2</sub> exchange over semi-arid Loess Plateau of Northwest China