scholarly journals Impacts of Global Warming on the Radial Growth and Long-Term Intrinsic Water-Use Efficiency (iWUE) of Schrenk Spruce (Picea schrenkiana Fisch. et Mey) in the Sayram Lake Basin, Northwest China

Forests ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 380
Author(s):  
Li Qin ◽  
Yujiang Yuan ◽  
Huaming Shang ◽  
Shulong Yu ◽  
Weiping Liu ◽  
...  
Keyword(s):  
Global Warming ◽  
Radial Growth ◽  
Atmospheric Co2 ◽  
Lake Basin ◽  
Picea Schrenkiana ◽  
Co2 Concentrations ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency ◽  
Atmospheric Co2 Concentrations

Global warming and the sharp rise in atmospheric CO2 concentrations have a profound impact on forest ecosystems. To better manage these changes, a comprehensive understanding of forest ecosystem responses to global change is essential. There is a lack of knowledge about the growth response of Schrenk spruce (Picea schrenkiana Fisch. et Mey)—an endemic tree species found in the arid Central Asian region—to climate change and rising atmospheric CO2 concentrations. In this study, core samples of Schrenk spruce were collected in the Sayram Lake Basin, Xinjiang. Tree-ring radial growth and long-term intrinsic water-use efficiency (iWUE) chronologies were established based on standard tree-ring width and stable carbon isotope methods. The relationships between atmospheric CO2 concentrations, climate, radial growth, and iWUE were analyzed. Our results indicate that the iWUE of trees in this region has continued to rise rapidly but that radial growth has not increased over the past 160 years. The main factor affecting iWUE is atmospheric CO2 concentrations (Ca), whereas the radial growth is much more sensitive to water availability. This may explain why the increase Ca has not had a fertilizer effect on the radial growth of trees.

The effect of long-term atmospheric CO2 enrichment on the intrinsic water-use efficiency of sour orange trees

Chemosphere ◽  
2003 ◽  
Vol 50 (2) ◽  
pp. 217-222 ◽  
Author(s):  
S.W. Leavitt ◽  
S.B. Idso ◽  
B.A. Kimball ◽  
J.M. Burns ◽  
A. Sinha ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Co2 Enrichment ◽  
Atmospheric Co2 ◽  
Sour Orange ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency ◽  
Orange Trees

scholarly journals The hot and the cold: unravelling the variable response of plant respiration to temperature

2005 ◽  
Vol 32 (2) ◽  
pp. 87 ◽  
Author(s):  
Owen K. Atkin ◽  
Dan Bruhn ◽  
Vaughan M. Hurry ◽  
Mark G. Tjoelker
Keyword(s):  
Water Availability ◽  
Thermal Acclimation ◽  
Atmospheric Co2 ◽  
Co2 Efflux ◽  
Co2 Concentrations ◽  
Long Term Changes ◽  
Q10 Values ◽  
Atmospheric Co2 Concentrations ◽  
Plant Respiration

When predicting the effects of climate change, global carbon circulation models that include a positive feedback effect of climate warming on the carbon cycle often assume that (1) plant respiration increases exponentially with temperature (with a constant Q10) and (2) that there is no acclimation of respiration to long-term changes in temperature. In this review, we show that these two assumptions are incorrect. While Q10 does not respond systematically to elevated atmospheric CO2 concentrations, other factors such as temperature, light, and water availability all have the potential to influence the temperature sensitivity of respiratory CO2 efflux. Roots and leaves can also differ in their Q10 values, as can upper and lower canopy leaves. The consequences of such variable Q10 values need to be fully explored in carbon modelling. Here, we consider the extent of variability in the degree of thermal acclimation of respiration, and discuss in detail the biochemical mechanisms underpinning this variability; the response of respiration to long-term changes in temperature is highly dependent on the effect of temperature on plant development, and on interactive effects of temperature and other abiotic factors (e.g. irradiance, drought and nutrient availability). Rather than acclimating to the daily mean temperature, recent studies suggest that other components of the daily temperature regime can be important (e.g. daily minimum and / or night temperature). In some cases, acclimation may simply reflect a passive response to changes in respiratory substrate availability, whereas in others acclimation may be critical in helping plants grow and survive at contrasting temperatures. We also consider the impact of acclimation on the balance between respiration and photosynthesis; although environmental factors such as water availability can alter the balance between these two processes, the available data suggests that temperature-mediated differences in dark leaf respiration are closely linked to concomitant differences in leaf photosynthesis. We conclude by highlighting the need for a greater process-based understanding of thermal acclimation of respiration if we are to successfully predict future ecosystem CO2 fluxes and potential feedbacks on atmospheric CO2 concentrations.

scholarly journals 1982–2010 Trends of Light Use Efficiency and Inherent Water Use Efficiency in African vegetation: Sensitivity to Climate and Atmospheric CO2 Concentrations

2014 ◽  
Vol 6 (9) ◽  
pp. 8923-8944 ◽  
Author(s):  
Abdoul Traore ◽  
Philippe Ciais ◽  
Nicolas Vuichard ◽  
Natasha MacBean ◽  
Cecile Dardel ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Atmospheric Co2 ◽  
Light Use Efficiency ◽  
Co2 Concentrations ◽  
Use Efficiency ◽  
Atmospheric Co2 Concentrations

Disentangling the effects of atmospheric CO2 and climate on intrinsic water-use efficiency in South Asian tropical moist forest trees

2020 ◽  
Vol 40 (7) ◽  
pp. 904-916
Author(s):  
Mizanur Rahman ◽  
Mahmuda Islam ◽  
Aster Gebrekirstos ◽  
Achim Bräuning
Keyword(s):  
South Asian ◽  
Co2 Concentration ◽  
Atmospheric Co2 ◽  
Annual Variability ◽  
Intrinsic Water Use Efficiency ◽  
Moist Forest ◽  
Increasing Trend ◽  
Use Efficiency ◽  
Species Specific

Abstract Due to the increase in atmospheric CO2 concentrations, the ratio of carbon fixed by assimilation to water lost by transpiration through stomatal conductance (intrinsic water-use efficiency, iWUE) shows a long-term increasing trend globally. However, the drivers of short-term (inter-annual) variability in iWUE of tropical trees are poorly understood. We studied the inter-annual variability in iWUE of three South Asian tropical moist forest tree species (Chukrasia tabularis A.Juss., Toona ciliata M. Roem. and Lagerstroemia speciosa L.) derived from tree-ring stable carbon isotope ratio (δ13C) in response to variations of environmental conditions. We found a significantly decreasing trend in carbon discrimination (Δ13C) and an increasing trend in iWUE in all the three species, with a species-specific long-term trend in intercellular CO2 concentration (Ci). Growing season temperatures were the main driver of inter-annual variability of iWUE in C. tabularis and L. speciosa, whereas previous year temperatures determined the iWUE variability in T. ciliata. Vapor pressure deficit was linked with iWUE only in C. tabularis. Differences in shade tolerance, tree stature and canopy position might have caused this species-specific variation in iWUE response to climate. Linear mixed effect modeling successfully simulated iWUE variability, explaining 41–51% of the total variance varying with species. Commonality analysis revealed that temperatures had a dominant influence on the inter-annual iWUE variability (64–77%) over precipitation (7–22%) and atmospheric CO2 concentration (3–6%). However, the long-term variations in iWUE were explicitly determined by the atmospheric CO2 increase (83–94%). Our results suggest that the elevated CO2 and concomitant global warming might have detrimental effects on gas exchange and other physiological processes in South Asian tropical moist forest trees.

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