Isotope Dendrochronology: Historical Perspective

Leavitt, Steven W.; Roden, John S.

doi:10.1007/978-3-030-92698-4_1

Cited by 3 publications

(2 citation statements)

References 139 publications

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“…Analysis of the systematic 13 C/ 12 C variation (commonly termed “ 13 C signal”; abbreviations in Table 1) across tree-ring series is widely used to study physiological traits such as water-use efficiency, plant-environment interactions, and past climate conditions (Leavitt & Roden, 2022). Signals found at the whole-tissue or whole-molecule level (Fig.…”

Section: Introductionmentioning

confidence: 99%

New insights into the mechanisms of plant isotope fractionation from combined analysis of intramolecular¹³C and deuterium abundances inPinus nigratree-ring glucose

Wieloch,

Holloway-Phillips,

et al. 2024

Preprint

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SummaryUnderstanding isotope fractionation mechanisms is fundamental for analyses of plant ecophysiology and paleoclimate based on tree-ring isotope data.To provide new insights into isotope fractionation, we analysed intramolecular13C discrimination in tree-ring glucose (Δi’,i= C-1 to C-6) and metabolic deuterium fractionation at H1and H2(εmet) combinedly.This dual-isotope approach enabled deconvolution of isotope signals. We found evidence for physiological processes affectingΔ1’ andΔ3’ which respond to air vapour pressure deficit (VPD), and processes affectingΔ1’,Δ2’, andεmetwhich respond to precipitation but notVPD. These relationships exhibit change points dividing a period of homeostasis (1961-1980) from a period of metabolic adjustment (1983-1995). Homeostasis may result from sufficient groundwater availability. Additionally, we foundΔ5’ andΔ6’ relationships with radiation and temperature which are temporally stable and consistent with previously proposed isotope fractionation mechanisms.Based on the multitude of climate covariables, intramolecular carbon isotope analysis has an extraordinary potential for climate reconstruction. While isotope fractionation beyond leaves is usually considered to be constant, we propose significant parts of the carbon and hydrogen isotope variation in tree-ring glucose originate in stems (precipitation-dependent signals). As basis for follow-up studies, we propose mechanisms introducingΔ1’,Δ2’,Δ3’, andεmetvariability.

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Section: Introductionmentioning

confidence: 99%

New insights into the mechanisms of plant isotope fractionation from combined analysis of intramolecular¹³C and deuterium abundances inPinus nigratree-ring glucose

Wieloch,

Holloway-Phillips,

et al. 2024

Preprint

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show abstract

“…Various physical and chemical parameters of tree rings have been analysed, especially in recent decades (Björklund et al 2019;Leavitt and Roden 2022). However, tree-ring width (TRW) is still the most popular parameter used for climatic reconstructions, although it has been demonstrated…”

Section: Introductionmentioning

confidence: 99%

Blue intensity of Swiss stone pine as a high-frequency temperature proxy in the Alps

et al. 2023

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Tree rings are widely used for climatic reconstructions and for improving our understanding of ongoing climate change in high-altitude sensitive areas. X-ray maximum latewood density is a very powerful parameter to reconstruct past climatic variations, especially if compared to tree-ring width, but this method is neither inexpensive nor timesaving. However, blue intensity (BI) has resulted in an excellent maximum wood density surrogate that measures the intensity of reflected light from latewood in the blue spectra. This methodology is still considered a prototype parameter, and more data are needed for validation of the method. We present the first BI values coming from Swiss stone pine (Pinus cembra L.) collected on the southern margin of the Alps. Analyses were performed by testing different solvents and polishing techniques, as well as different CooRecorder pixel percentage settings. The results demonstrate that solvents and software parameters have little influence on the final chronologies. Dendroclimatic analyses demonstrate that Swiss stone pine BI can be a useful tool to extract at least the high-frequency variations in July–August temperatures with a correlation coefficient of up to 0.6 (over the 1800–2017 time period). The immunity of Swiss stone pine to insect defoliator outbreaks further enhances the reliability of the BI values of this species in reconstructing past high-frequency temperature variations in high-altitude sensitive areas.

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New insights into the mechanisms of plant isotope fractionation from combined analysis of intramolecular ¹³C and deuterium abundances in Pinus nigra tree‐ring glucose

Wieloch,

Holloway‐Phillips,

et al. 2024

New Phytologist

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Summary Understanding isotope fractionation mechanisms is fundamental for analyses of plant ecophysiology and paleoclimate based on tree‐ring isotope data. To gain new insights into isotope fractionation, we analysed intramolecular 13C discrimination in tree‐ring glucose (Δi′, i = C‐1 to C‐6) and metabolic deuterium fractionation at H1 and H2 (εmet) combinedly. This dual‐isotope approach was used for isotope‐signal deconvolution. We found evidence for metabolic processes affecting Δ1′ and Δ3′, which respond to air vapour pressure deficit (VPD), and processes affecting Δ1′, Δ2′, and εmet, which respond to precipitation but not VPD. These relationships exhibit change points dividing a period of homeostasis (1961–1980) from a period of metabolic adjustment (1983–1995). Homeostasis may result from sufficient groundwater availability. Additionally, we found Δ5′ and Δ6′ relationships with radiation and temperature, which are temporally stable and consistent with previously proposed isotope fractionation mechanisms. Based on the multitude of climate covariables, intramolecular carbon isotope analysis has a remarkable potential for climate reconstruction. While isotope fractionation beyond leaves is currently considered to be constant, we propose significant parts of the carbon and hydrogen isotope variation in tree‐ring glucose originate in stems (precipitation‐dependent signals). As basis for follow‐up studies, we propose mechanisms introducing Δ1′, Δ2′, Δ3′, and εmet variability.

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Isotope Dendrochronology: Historical Perspective

Cited by 3 publications

References 139 publications

New insights into the mechanisms of plant isotope fractionation from combined analysis of intramolecular¹³C and deuterium abundances inPinus nigratree-ring glucose

New insights into the mechanisms of plant isotope fractionation from combined analysis of intramolecular¹³C and deuterium abundances inPinus nigratree-ring glucose

Blue intensity of Swiss stone pine as a high-frequency temperature proxy in the Alps

New insights into the mechanisms of plant isotope fractionation from combined analysis of intramolecular ¹³C and deuterium abundances in Pinus nigra tree‐ring glucose

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Isotope Dendrochronology: Historical Perspective

Cited by 3 publications

References 139 publications

New insights into the mechanisms of plant isotope fractionation from combined analysis of intramolecular13C and deuterium abundances inPinus nigratree-ring glucose

New insights into the mechanisms of plant isotope fractionation from combined analysis of intramolecular13C and deuterium abundances inPinus nigratree-ring glucose

Blue intensity of Swiss stone pine as a high-frequency temperature proxy in the Alps

New insights into the mechanisms of plant isotope fractionation from combined analysis of intramolecular 13C and deuterium abundances in Pinus nigra tree‐ring glucose

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New insights into the mechanisms of plant isotope fractionation from combined analysis of intramolecular¹³C and deuterium abundances inPinus nigratree-ring glucose

New insights into the mechanisms of plant isotope fractionation from combined analysis of intramolecular¹³C and deuterium abundances inPinus nigratree-ring glucose

New insights into the mechanisms of plant isotope fractionation from combined analysis of intramolecular ¹³C and deuterium abundances in Pinus nigra tree‐ring glucose