The relationship between deuterium and oxygen-18 delta values in leaf water

Allison, G.B.; Gat, J.R.; Leaney, Fred

doi:10.1016/0168-9622(85)90035-1

Cited by 145 publications

(109 citation statements)

References 11 publications

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“…O of leaf water with height in the vegetation canopy has been noted in coniferous [Allison et al, 1985] and tropical (J. P. Ometto et al, Oxygen isotope ratios of waters and respired CO 2 in Amazonian forest and pasture ecosystem, submitted to Ecological Applications, 2003) forests, but such variation is not always observed [Flanagan and Varney, 1995;Bowling, 1999].…”

mentioning

confidence: 99%

Oxygen isotope content of CO₂ in nocturnal ecosystem respiration: 2. Short‐term dynamics of foliar and soil component fluxes in an old‐growth ponderosa pine forest

Bowling

McDowell²,

Welker

et al. 2003

Global Biogeochemical Cycles

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The oxygen isotope contents (δ18O) of soil, xylem, and leaf water and ecosystem respiration were studied in a ponderosa pine forest during summer 2001. Our goal was to assess whether δ18O of CO2 could be used to quantify the relative contributions of soil and foliar respiration to total nocturnal ecosystem respiration. The δ18O in leaf and soil water showed enrichment over a 2‐week sampling period as the weather became hot and dry (leaves 0.9 to 15.0‰, and soil −10.4 to −3.1‰), while δ18O of xylem water remained constant (−12.9‰). Water in the soil was enriched in 18O near the soil surface (−6.4‰ at 5 cm depth) relative to greater depths (−11.1‰ at 20 cm). The δ18O of ecosystem respiration became gradually enriched over the 2‐week sampling period (from 24.2 initially to 32.9‰ at the end, VSMOW scale). Soil respiration contributed 80 ± 12 percent to the total respiratory flux, close to estimates from scaled‐up chamber data (77% [Law et al., 2001a]). Quantitative application of the isotopic approach to determine respiratory proportions required direct measurement of δ18O of soil and xylem water, air and soil temperature, and humidity. Better estimates of the isotopic signatures of component fluxes could be achieved with additional measurements and more detailed modeling. Results demonstrate that (1) there is variability in δ18O of precipitation inputs to ecosystems, (2) immediately following a precipitation event, δ18O of ecosystem respiration may reflect δ18O of precipitation, (3) periods of hot dry weather can substantially enrich ecosystem water pools and subsequently alter the isotope content of CO2 in ecosystem respiration, and (4) stable oxygen isotopes in CO2 can be used to quantify the foliar and soil components of ecosystem respiration.

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mentioning

confidence: 99%

Oxygen isotope content of CO₂ in nocturnal ecosystem respiration: 2. Short‐term dynamics of foliar and soil component fluxes in an old‐growth ponderosa pine forest

Bowling

McDowell²,

Welker

et al. 2003

Global Biogeochemical Cycles

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“…O in leaf water relative to groundwater (Allison et al, 1985;Yakir et al, 1990). Variations in relative humidity can therefore be recorded in the variations of tree-ring d…”

mentioning

confidence: 99%

“…O will come from the isotopic signature of precipitation (McCarroll and Loader, 2004 (Majoube, 1971), so it is regarded as a constant value of 9% (Allison et al, 1985). Additionally, the kinetic fractionation factor (o k ) and the biologic fractionation factor (o o ) are also considered to be constant with values of 28%, and 27%, respectively (Anderson et al, 2002).…”

mentioning

confidence: 99%

Specific climatic signals recorded in earlywood and latewood δ<sup>18</sup>O of tree rings in southwestern China

Liu

Leavitt

et al. 2012

Tellus B: Chemical and Physical Meteorology

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“…Secondly, there is a possibility that the quantity of water absorbed by roots from the irrigated side of the pot was perhaps sufficient to hydrate the above-ground plant parts but not sufficient enough to hydrate all roots in the drying soil given the relatively short time period over which the samplings were taken. Thirdly, the liberation of hydrogen (H) from breaking down of plant tissues or sap carbohydrates at high temperature of the azeotropic distillation technique might have modified the δ 2 H values of water [31]. Finally, deuterium might have been retained in the tissue matrix, or mixed and exchanged with hydrogen atoms of cell tissues in different compartments of the above-ground plant parts [34], which could have resulted in either loss of deuterium or slowed down the deuterium content reaching the roots growing in the drying soil, thereby reducing deuterium concentration.…”

Section: Discussionmentioning

confidence: 99%

“…The water extraction process took 2-3 h to complete. Water samples were purified with powder paraffin wax (solidifying point 63-66°C) for any impurities [30][31][32]. The purified water samples were stored in 2 ml vials at -30°C [6,27].…”

Section: Root Extractionmentioning

confidence: 99%

Hydraulic Redistribution from Wet to Drying Roots of Potatoes (Solanum tubersosum L.) During Partial Rootzone Drying

Boomer¹

2014

Adv Crop Sci Tech

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Hydraulic redistribution, redistribution of water upward or downward within a soil profile through roots as a consequence of root-soil water potential gradients, can be an important mechanism in transporting chemical signals (i.e. abscisic acid) to the shoot for stomatal closure or in maintaining the root system during dry periods of partial rootzone drying (PRD). PRD involves alternate irrigation to two sides of a plant root system. The study reported here investigated the occurrence and magnitude of hydraulic redistribution in glasshouse-grown potatoes (Solanum tuberosum L.) under PRD. Deuterium labelled water was applied to only one half of the root system to field capacity at tuber initiation. The roots from the drying side of the dual pot were extracted at 3, 6, 12, 18 and 24 h following watering by the dry sieving method. Water from the roots was extracted by azeotropic distillation and analysed for hydrogen isotope ratios. Hydraulic redistribution occurred the most at night when stomatal conductance was considerably lower and leaf water potential was higher (less negative). The magnitude of the redistributed water, however, did not exceed 3.5%, indicating limited water redistribution under PRD. The observed water redistribution would probably be of little significance for the survival of roots present in the upper drier portion of the soil under higher water demanding conditions but its role in sending the chemical signals to the shoot to conserve water by reducing transpiration would be of particular significance during drying periods of partial rootzone drying.

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The relationship between deuterium and oxygen-18 delta values in leaf water

Cited by 145 publications

References 11 publications

Oxygen isotope content of CO₂ in nocturnal ecosystem respiration: 2. Short‐term dynamics of foliar and soil component fluxes in an old‐growth ponderosa pine forest

Oxygen isotope content of CO₂ in nocturnal ecosystem respiration: 2. Short‐term dynamics of foliar and soil component fluxes in an old‐growth ponderosa pine forest

Specific climatic signals recorded in earlywood and latewood δ<sup>18</sup>O of tree rings in southwestern China

Hydraulic Redistribution from Wet to Drying Roots of Potatoes (Solanum tubersosum L.) During Partial Rootzone Drying

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The relationship between deuterium and oxygen-18 delta values in leaf water

Cited by 145 publications

References 11 publications

Oxygen isotope content of CO2 in nocturnal ecosystem respiration: 2. Short‐term dynamics of foliar and soil component fluxes in an old‐growth ponderosa pine forest

Oxygen isotope content of CO2 in nocturnal ecosystem respiration: 2. Short‐term dynamics of foliar and soil component fluxes in an old‐growth ponderosa pine forest

Specific climatic signals recorded in earlywood and latewood δ<sup>18</sup>O of tree rings in southwestern China

Hydraulic Redistribution from Wet to Drying Roots of Potatoes (Solanum tubersosum L.) During Partial Rootzone Drying

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Oxygen isotope content of CO₂ in nocturnal ecosystem respiration: 2. Short‐term dynamics of foliar and soil component fluxes in an old‐growth ponderosa pine forest

Oxygen isotope content of CO₂ in nocturnal ecosystem respiration: 2. Short‐term dynamics of foliar and soil component fluxes in an old‐growth ponderosa pine forest