Influence of temperature and leaf-to-air vapor pressure deficit on net photosynthesis and stomatal conductance in red spruce (Picea rubens)

Day, Michael E.

doi:10.1093/treephys/20.1.57

Cited by 112 publications

(70 citation statements)

References 27 publications

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“…Physiological experiments also provide evidence of temperature influencing plants through atmospheric water demand. When the direct effects of temperature increases on vegetation are isolated from the temperature-driven increase in vapor pressure deficit, the vapor pressure effects are large relative to the direct temperature effects at warmer temperatures (Day 2000). From this we expect increases in atmospheric water demand, in the form of vapor pressure deficit, to be the dominant constraint on vegetation in places with relatively warm temperatures (above 168C).…”

Section: F Removing Nonvegetated Terrestrial Grid Pointsmentioning

confidence: 96%

“…1 and 2 Bjorkman 1980), the water demand of the atmosphere (Day 2000), and the increased costs of respiration at higher temperatures (Sprugel et al 1995). Alternatively, b PRECIP will be influenced by a range of factors depending on the climatology of a region-from interannual variations in snowpack, water-supply-driven hydrologic stress, and light limitation from thick cloud cover during relatively high rainfall years.…”

Section: A Empirical Sensitivity Of Vegetation To Climatementioning

confidence: 99%

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Empirically Derived Sensitivity of Vegetation to Climate across Global Gradients of Temperature and Precipitation

Quetin

Swann

2017

Journal of Climate

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The natural composition of terrestrial ecosystems can be shaped by climate to take advantage of local environmental conditions. Ecosystem functioning (e.g., interaction between photosynthesis and temperature) can also acclimate to different climatological states. The combination of these two factors thus determines ecologicalclimate interactions. A global empirical map of the sensitivity of vegetation to climate is derived using the response of satellite-observed greenness to interannual variations in temperature and precipitation. Mechanisms constraining ecosystem functioning are inferred by analyzing how the sensitivity of vegetation to climate varies across climate space. Analysis yields empirical evidence for multiple physical and biological mediators of the sensitivity of vegetation to climate at large spatial scales. In hot and wet locations, vegetation is greener in warmer years despite temperatures likely exceeding thermally optimum conditions. However, sunlight generally increases during warmer years, suggesting that the increased stress from higher atmospheric water demand is offset by higher rates of photosynthesis. The sensitivity of vegetation transitions in sign (greener when warmer or drier to greener when cooler or wetter) along an emergent line in climate space with a slope of about 59 mm yr 21 8C 21, twice as steep as contours of aridity. The mismatch between these slopes is evidence at a global scale of the limitation of both water supply due to inefficiencies in plant access to rainfall and plant physiological responses to atmospheric water demand. This empirical pattern can provide a functional constraint for process-based models, helping to improve predictions of the global-scale response of vegetation to a changing climate.

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Section: F Removing Nonvegetated Terrestrial Grid Pointsmentioning

confidence: 96%

Section: A Empirical Sensitivity Of Vegetation To Climatementioning

confidence: 99%

Empirically Derived Sensitivity of Vegetation to Climate across Global Gradients of Temperature and Precipitation

Quetin

Swann

2017

Journal of Climate

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“…Thus, Rs may serves as physiological response trait for this species to reduce water loss under low water availability. Earlier findings explained the association of Rs with VDP and T as an adaptive mechanism to regulate stomatal opening and closure 26 , especially under water stress conditions 28 .…”

Section: Stomatal Resistancementioning

confidence: 93%

“…Some plants regulate their stomata as part of their strategy to withstand water stress 25 . This regulation is influenced by T and VPD 26 . In turn, VPD depends on seasonal atmospheric conditions during the year 27 and plant stress status 28 .…”

Section: Air-to-leaf Temperature Difference and Vapour Pressure Deficitmentioning

confidence: 99%

“…Water stress tends to increase stomatal resistance 24 as part of the plant strategy to withstand low water availability 25 . Leaf and air temperature and vapour pressure deficit (VPD) have a strong influence in regulating stomatal functions and hence affect net photosynthesis 26 . VPD varies according to the season of the year, leading to seasonal variation in stomatal opening and closure 27 .…”

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confidence: 99%

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Changes in Vapour Pressure Deficit and Air-To-Leaf Temperature Difference Due to the Effects of Watering Frequency and Seasonal Variation-Induced Adaptive Responses in <i>Balanites aegyptiaca</i> in Saudi Arabia

Elfeel

2017

Current Science

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This study examines intraspecific variability among three sources (KSA, SD5.1 and SD6.2) of Balanites aegyptiaca in Saudi Arabia in their response to different watering frequencies and seasonal changes in vapour pressure deficit (VPD) and air-to-leaf temperature difference (T) under field condition. Irrigation was done once a week, once every two weeks or once every three weeks. Traits measured include: tree height, diameter (DM), relative monthly height (RMHI) and diameter (RMDI) increments, stomatal resistance (Rs), specific leaf weight (SLW). VPD and T were measured during the same time of Rs and SLW measurements. Both Rs and SLW directly responded to irrigation treatment and seasonal variation in T and VPD. Interactive effects of hot weather and water stress increased leaf temperature, resulting in less T and more VPD that induced higher Rs and SLW values. SD5.1 accounted for better responses under water stress, due to its higher Rs and SLW in the same time maintained better growth. DM and RMDI were more responsive to watering stress and varied among the sources. Early seedlings root-toshoot ratio was associated with better growth performance later in the field. The results highlight the role of hot weather and water stress in producing large changes in T and VPD that have a major impact on Rs and SLW. In addition, there is large intraspecific variation in field growth and adaptive responses among seeds brought from different provenances.

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Convergent approaches to determine an ecosystem's transpiration fraction

Berkelhammer

Noone

Wong

et al. 2016

Global Biogeochemical Cycles

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The transpiration (T) fraction of total terrestrial evapotranspiration (ET), T/ET, can vary across ecosystems between 20–95% with a global average of ∼60%. The wide range may either reflect true heterogeneity between ecosystems and/or uncertainties in the techniques used to derive this property. Here we compared independent approaches to estimate T/ET at two needleleaf forested sites with a factor of 3 difference in leaf area index (LAI). The first method utilized water vapor isotope profiles and the second derived transpiration through its functional relationship with gross primary production. We found strong agreement between T/ET values from these two independent approaches although we noted a discrepancy at low vapor pressure deficits (VPD). We hypothesize that this divergence arises because stomatal conductance is independent of humidity at low VPD. Overall, we document significant synoptic‐scale T/ET variability but minimal growing season‐scale variability. This result indicates a high sensitivity of T/ET to passing weather but convergence toward a stable mean state, which is set by LAI. While changes in T/ET could emerge from a myriad of processes, including aboveground (LAI) or belowground (rooting depth) changes, there was only minimal interannual variability and no secular trend in our analysis of T/ET from the 15 year eddy covariance time series at Niwot Ridge. If the lack of trend observed here is apparent elsewhere, it suggests that the processes controlling the T and E fluxes are coupled in a way to maintain a stable ratio.

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Influence of temperature and leaf-to-air vapor pressure deficit on net photosynthesis and stomatal conductance in red spruce (Picea rubens)

Cited by 112 publications

References 27 publications

Empirically Derived Sensitivity of Vegetation to Climate across Global Gradients of Temperature and Precipitation

Empirically Derived Sensitivity of Vegetation to Climate across Global Gradients of Temperature and Precipitation

Changes in Vapour Pressure Deficit and Air-To-Leaf Temperature Difference Due to the Effects of Watering Frequency and Seasonal Variation-Induced Adaptive Responses in <i>Balanites aegyptiaca</i> in Saudi Arabia

Convergent approaches to determine an ecosystem's transpiration fraction

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