Optimizing stomatal conductance for maximum carbon gain under water stress: a meta-analysis across plant functional types and climates

Manzoni, Stefano; Vico, Giulia; Katul, Gabriel G.; Fay, Philip A.; Polley, W.; Palmroth, Sari; Porporato, Amilcare

doi:10.1111/j.1365-2435.2010.01822.x

Cited by 231 publications

(218 citation statements)

References 69 publications

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“…Early planting in 2014/15 and mid planting in 2015/16 seasons experienced sufficient distribution of rainfall majorly in their growth and developmental stages which enhanced stomatal conductivity. Manzoni et al (2011) reported that high stomatal increased CO 2 diffusion inside the leaf thus improving photosynthetic rate. Low stomatal conductivity in late planting at both seasons might be due to stomatal closure which is widely thought to be plant's first line of defence in response to developing water stress.…”

Section: Discussionmentioning

confidence: 99%

Planting Dates and Harvesting Stages Influence on Maize Yield under Rain-Fed Conditions

Adelabu¹,

Modi²

2017

JAS

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Understanding the challenges associated with variation in weather conditions and stages of maturity in maize are essential for farmers to achieve continuous production under climate changes. This research evaluated the interactive effect of planting date and stages of maturity at harvest on maize yield (Zea mays L.). Field trials were conducted during the 2014/15 and 2015/16 seasons at university of KwaZulu-Natal research farm Pietermaritzburg South Africa. Planting dates comprised of early (November), mid (December) and late planting dates (January). While, harvesting occurred at milk stage, dent stage and physiological maturity. A split plotdesign with four replications was used. The main plot and sub-plot consisted of planting dates and harvesting stages respectively. Response of maize to planting dates and harvesting stages was determined by variables of plant physiological growth and yield parameters. Significant differences in growth and physiological parameters were more obvious in 2015/16 season which was a drier season than 2014/15. Early and mid-planting had positive effect on parameters measured at both seasons. However, mid planting date favoured maize growth and yield more in drier season. The interaction of planting dates and harvesting stages significantly influenced grain yield, thousand seed weight, ear length and diameter. Thousand seed weight, ear length and diameter obtained at dent stage under mid planting outperformed its counterpart from physiological maturity under which late planting. With the increase in climate variability there is high risk that maize planted lately would have lower yield irrespective of its planting dates and might not attain physiological maturity. However, maize harvested at dent stage under early and mid-planting dates gave substantially high yield.

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Section: Discussionmentioning

confidence: 99%

Planting Dates and Harvesting Stages Influence on Maize Yield under Rain-Fed Conditions

Adelabu¹,

Modi²

2017

JAS

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“…C 4 crops are generally found to have high phosphoenolpyruvate carboxylase activity (Still et al, 2003). In addition, many studies have found that C 4 plants exhibited increasing WUE in response to rising CO 2 with reductions in stomatal conductance and transpirational water loss compared to C 3 species (Manzoni et al, 2011;Traore et al, 2014). Nevertheless, WUE RS only captured the broad trend of WUE.…”

Section: Comparisons Of Wue From Flux Tower Measurements and Modis Esmentioning

confidence: 99%

Characterizing ecosystem water-use efficiency of croplands with eddy covariance measurements and MODIS products

Tang

Ding

et al. 2015

Ecological Engineering

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a b s t r a c tHow to quantify the variability in ecosystem water use efficiency (WUE) of croplands is of vital importance. Especially in the context of changing hydrologic environment, much attention need to be paid on how to use limited water to improve crop yield. However, the biophysical performances of environmental/biological controls, crop types, and effects of diverse farming practices on WUE remain unclear. Therefore, this study aims to address these questions through tower-based measurements from eddy covariance and satellite-based estimates from MODIS GPP and ET products at the two annual soybean/corn rotation fields. The results exhibited that temperature and solar radiation are the most important meteorological factors. MODIS WUE estimates captured the broad trend of 8-day tower-based observations. However, ecosystem WUE was overpredicted at the seedling stage and after harvest, and was severely underestimated at the peak periods of maize, which was mainly ascribed to the uncertainties in MODIS GPP. Finally, we evaluated the effects of two farming practices (conventional vs alternative) on WUE and carbon sequence (NEE). On annual time scale, WUE of both soybean and maize are improved obviously under the alternative management whereas contrasting effects are observed on NEE. But the overall carbon balance for both treatments is nearly identical over 2-year rotation.

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“…Our results indicate that the combined effects of soil moisture and atmospheric drought on stomatal conductance have to be taken into account. Moreover, model performance could be improved through the inclusion of non-stomatal limitations on plant photosynthesis, which have been considered to be important for the simulation of short-term plant responses to drought (Egea et al, 2011;Manzoni et al, 2011;Zhou et al, 2013). However, JSBACH is being continuously developed and the effect of soil water stress is to be accounted for according to Egea et al (2011) for both stomatal and nonstomatal processes, affecting both conductance and photosynthesis parameters.…”

Section: Differences Between Observations and Site Simulationsmentioning

confidence: 99%

Response of water use efficiency to summer drought in a boreal Scots pine forest in Finland

et al. 2017

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Abstract. The influence of drought on plant functioning has received considerable attention in recent years, however our understanding of the response of carbon and water coupling to drought in terrestrial ecosystems still needs to be improved. A severe soil moisture drought occurred in southern Finland in the late summer of 2006. In this study, we investigated the response of water use efficiency to summer drought in a boreal Scots pine forest (Pinus sylvestris) on the daily time scale mainly using eddy covariance flux data from the Hyytiälä (southern Finland) flux site. In addition, simulation results from the JSBACH land surface model were evaluated against the observed results. Based on observed data, the ecosystem level water use efficiency (EWUE; the ratio of gross primary production, GPP, to evapotranspiration, ET) showed a decrease during the severe soil moisture drought, while the inherent water use efficiency (IWUE; a quantity defined as EWUE multiplied with mean daytime vapour pressure deficit, VPD) increased and the underlying water use efficiency (uWUE, a metric based on IWUE and a simple stomatal model, is the ratio of GPP multiplied with a square root of VPD to ET) was unchanged during the drought. The decrease in EWUE was due to the stronger decline in GPP than in ET. The increase in IWUE was because of the decreased stomatal conductance under increased VPD. The unchanged uWUE indicates that the trade-off between carbon assimilation and transpiration of the boreal Scots pine forest was not disturbed by this drought event at the site. The JS-BACH simulation showed declines of both GPP and ET under the severe soil moisture drought, but to a smaller extent compared to the observed GPP and ET. Simulated GPP and ET led to a smaller decrease in EWUE but a larger increase in IWUE because of the severe soil moisture drought in comparison to observations. As in the observations, the simulated uWUE showed no changes in the drought event. The model deficiencies exist mainly due to the lack of the limiting effect of increased VPD on stomatal conductance during the low soil moisture condition. Our study provides a deeper understanding of the coupling of carbon and water cycles in the boreal Scots pine forest ecosystem and suggests possible improvements to land surface models, which play an important role in the prediction of biosphere-atmosphere feedbacks in the climate system.

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Optimizing stomatal conductance for maximum carbon gain under water stress: a meta-analysis across plant functional types and climates

Cited by 231 publications

References 69 publications

Planting Dates and Harvesting Stages Influence on Maize Yield under Rain-Fed Conditions

Planting Dates and Harvesting Stages Influence on Maize Yield under Rain-Fed Conditions

Characterizing ecosystem water-use efficiency of croplands with eddy covariance measurements and MODIS products

Response of water use efficiency to summer drought in a boreal Scots pine forest in Finland

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