Temporal offset between precipitation and water uptake of Mediterranean pine trees varies with elevation and season

Juhlke, Tobias R.; Geldern, Robert van; Barth, Johannes A. C.; Bendix, Jörg; Bräuning, Achim; Garel, Émilie; Häusser, Martin; Huneau, Frédéric; Knerr, Isabel; Santoni, Sébastien; Szymczak, Sonja; Trachte, Katja

doi:10.1016/j.scitotenv.2020.142539

Cited by 15 publications

(10 citation statements)

References 59 publications

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“…Since many decades, stable isotopes of hydrogen and oxygen ( 2 H and 18 O) in the water molecule have proved valuable tools to quantify root water uptake and to assess transport processes and ecohydrological dynamics in forested catchments (recent examples: Allen et al, 2019;Evaristo et al, 2019;Knighton et al, 2020;Juhlke et al, 2021), and in agroforestry and agricultural ecosystems (Huo et al, 2020;Muñoz-Villers et al, 2020;Penna et al, 2020 and references therein). Despite the noteworthy advancements that the isotope technique added to the field of ecohydrology, recent research has questioned the reliability of many isotope-based plant water sourcing studies due to the discovery of several effects that prevent a robust quantification of the fractional contributions of different water sources to plant transpiration.…”

Section: Heterogeneity and Uncertainty In Isotope-based Estimates Of mentioning

confidence: 99%

“…In order to limit sampling and laboratory efforts for (ii), studies should be carefully designed from the beginning with the idea of providing useful data in space and time for upscaling (e.g., by accounting for requirements of geostatistical upscaling measures). Recently, Juhlke et al (2021) proposed an innovative method to avoid extensive soil water isotope sampling to understand water uptake patterns of one tree species along an elevation gradient. Furthermore, methods for temporally highresolution measurements of water isotopes in soils and plants are now available (see Beyer et al, 2020;Marshall et al, 2020) and can be adapted to cover larger spatial areas as well.…”

Section: How To Overcome Spatial Under-representativeness Of Isotope mentioning

confidence: 99%

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On the Spatio-Temporal Under-Representation of Isotopic Data in Ecohydrological Studies

Beyer

Penna

2021

Front. Water

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Section: Heterogeneity and Uncertainty In Isotope-based Estimates Of mentioning

confidence: 99%

Section: How To Overcome Spatial Under-representativeness Of Isotope mentioning

confidence: 99%

On the Spatio-Temporal Under-Representation of Isotopic Data in Ecohydrological Studies

Beyer

Penna

2021

Front. Water

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“…Recent studies have shown biome-scale correlations between rooting depths, stomatal regulation of transpiration and climate, and demonstrated their importance for understanding global hydrology (Canadell et al, 1996;Evaristo & McDonnell, 2017;Fan et al, 2017Fan et al, , 2019Hodge, 2004;Jing et al, 2021;Knighton et al, 2021;Yaling Liu et al, 2021;van Oorschot et al, 2021;Schenk & Jackson, 2005). There is also evidence that some species have flexible water use strategies in that they vary sources of root water uptake and stomatal regulation across local environmental gradients (Allen et al, 2019;Juhlke et al, 2021;Knighton, Souter-Kline, et al, 2019;Link et al, 2014;Martin et al, 2018;Mumbanza et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Water Use Strategy of Riparian Conifers Varies with Tree Size and Depends on Coordination of Water Uptake Depth and Internal Tree Water Storage

Knighton

2022

Preprint

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Abstract. Trees employ mechanisms to maintain safe xylem water transport including variations in trunk water storage and the depth of root water uptake. We tested the hypotheses that 1) trunk water storage is correlated with root water uptake in Eastern hemlock, 2) and that water use strategy varies with tree size. High spatiotemporal sampling of soil and hemlock xylem (30 trees) water isotopic ratios (2H, 18O) and tree tissue Relative Water Content (RWC) was conducted across seven months. Hemlock accessing more evaporatively enriched water from shallow soils stored less water within their trunks during dry periods, and more during wet periods. Soil and xylem water isotopic compositions revealed older and lower elevation hemlock primarily sourced water uptake from the upper 10 cm of soils, whereas younger and higher elevation trees sourced some water uptake from deeper soil layers. Larger diameter hemlock showed significant temporal changes in trunk RWC. In contrast, smaller diameter trees exhibited more temporally stable RWC. Observed species-level heterogeneity in xylem water isotope composition suggests the need for reporting of tree ages and a standardization of field sampling protocols to support our understanding of tree water use strategies. Our results inform the development of plant hydraulic strategies in ecohydrological- and terrestrial biosphere-models to understand forest responses to external stressors.

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“…Several studies indicate that greenhouses with controlled environmental variables are one of the great options to supply quality seedlings, guaranteeing their survival and symbiotic adaptation to the definitive development field [14,15]. Being one of the great challenges the control of environmental variables, such as: temperature, soil humidity, ambient humidity and lighting, each of them at certain intervals, for the production of Pinus radiata seedlings [16,17].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Control of Environmental Variables in a Pine Seedling Greenhouse

Carbajal-Morán¹,

Camarena²,

Galván-Maldonado³

et al. 2023

Pol. J. Environ. Stud.

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The objective of the research was to evaluate the control of environmental variables that allows obtaining a favorable environment inside a greenhouse for the development of Pinus radiata seedlings. A controller was implemented inside the greenhouse to maintain the variables in preset ranges: temperature from 19.0ºC to 25.0ºC; soil humidity from 50% to 100%; ambient humidity from 70% to 90% and illumination at levels greater than 450 lux. The control algorithm was implemented in the PIC 18F4550 microcontroller, as control actuators were used: a fan-exhaust fan and air heater for temperature; solenoid valves for soil and ambient humidity; LED lamps for illumination. As a result, the environmental variables controller, when tested for 24 hours for 10 days, maintained on average: temperature at 21.54ºC; soil humidity at 75.09%; relative humidity at 79.32% and illumination in the absence of sunlight at 451.62 lux. Likewise, it was found that the DQI of Pinus radiata seedlings of the average control group was 0.433 and the experimental group had an average DQI of 0.571; when evaluating the normalized DQI for both groups, a significant difference greater than 5% was obtained, with the t-test for two-tailed independent samples, with the p-value = 0.002, which is less than the significance level alpha = 0.05. Therefore, it is concluded that the controller generated a favorable environment for the development of the Pinus radiata seedlings of the experimental group, having a high possibility of survival when transferred to the final field.

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Temporal offset between precipitation and water uptake of Mediterranean pine trees varies with elevation and season

Cited by 15 publications

References 59 publications

On the Spatio-Temporal Under-Representation of Isotopic Data in Ecohydrological Studies

On the Spatio-Temporal Under-Representation of Isotopic Data in Ecohydrological Studies

Water Use Strategy of Riparian Conifers Varies with Tree Size and Depends on Coordination of Water Uptake Depth and Internal Tree Water Storage

Evaluation of the Control of Environmental Variables in a Pine Seedling Greenhouse

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