Correlations between oxygen isotope ratios of wood constituents of Quercus and Pinus samples from around the world

Barbour, Margaret M.; Andrews, T. John; Farquhar, Graham D.

doi:10.1071/pp00083

Cited by 126 publications

(179 citation statements)

References 25 publications

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“…We were surprised to find such a shallow slope between leaf a-cellulose d 18 O and bulk leaf tissue d 18 O, as previous studies have found slopes close to unity Barbour et al 2001). We hypothesize the shallow slope reflects differences in the extent to which leaf a-cellulose and bulk leaf tissue integrate over time.…”

Section: Variation In Leaf Physiology Within and Across Ecosystemsmentioning

confidence: 80%

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Variation in leaf physiology of Salix arctica within and across ecosystems in the High Arctic: test of a dual isotope (Δ13C and Δ18O) conceptual model

Sullivan

Welker

2006

Oecologia

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Leaf carbon isotope discrimination (Delta(13)C) varies with the balance between net photosynthesis (A) and stomatal conductance (g ( s )). Inferences that can be made with Delta(13)C are limited, as changes could reflect variation in A and/or g ( s ). Investigators have suggested that leaf delta(18)O enrichment above source water (Delta(18)O) may enable differentiation between sources of variation in Delta(13)C, as leaf Delta(18)O varies with transpiration rate (E), which is closely correlated with g ( s ) when leaves experience similar leaf to air vapor pressure differences. We examined leaf gas exchange of Salix arctica at eight sites with similar air temperatures and relative humidities but divergent soil temperatures and soil water contents near Pituffik, Greenland (76 degrees N, 38 degrees W). We found negative correlations at the site level between g ( s ) and Delta(18)O in bulk leaf tissue (r (2) = 0.62, slope = -17.9 per thousand/mol H(2)O m(-2) s(-1), P = 0.02) and leaf alpha-cellulose (r (2) = 0.83, slope = -11.5 per thousand mol H(2)O m(-2) s(-1), P < 0.01), consistent with the notion that leaf water enrichment declines with increasing E. We also found negative correlations at the site-level between intrinsic water-use efficiency (iWUE) and Delta(13)C in bulk leaf tissue (r (2) = 0.65, slope = -0.08 per thousand/mumol CO(2) /mol H(2)O, P = 0.02) and leaf alpha-cellulose (r (2) = 0.50, slope = -0.05 per thousand/[mumol CO(2) /mol H(2)O], P = 0.05). When increasing Delta(13)C was driven by increasing g ( s ) alone, we found negative slopes between Delta(13)C and Delta(18)O for bulk leaf tissue (-0.664) and leaf alpha-cellulose (-1.135). When both g ( s ) and A (max) increased, we found steeper negative slopes between Delta(13)C and Delta(18)O for bulk leaf tissue (-2.307) and leaf alpha-cellulose (-1.296). Our results suggest that the dual isotope approach is capable of revealing the qualitative contributions of g ( s ) and A (max) to Delta(13)C at the site level. In our study, bulk leaf tissue was a better medium than leaf alpha-cellulose for application of the dual isotope approach.

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Section: Variation In Leaf Physiology Within and Across Ecosystemsmentioning

confidence: 80%

“…Lignin, for instance, was found to be 6-7& depleted relative to acellulose in Quercus and Pinus wood samples from around the world (Barbour et al 2001). Subtle variation in leaf composition may, therefore, create additional scatter in the D 18 O:g s correlation for bulk leaf tissue.…”

Section: O Versus G Smentioning

confidence: 97%

Variation in leaf physiology of Salix arctica within and across ecosystems in the High Arctic: test of a dual isotope (Δ13C and Δ18O) conceptual model

Sullivan

Welker

2006

Oecologia

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“…Although the mechanisms contributing to ε cp are not well understood, δ 18 O p and δ 18 O c have been strongly correlated when measured on the same samples in both leaves and wood (Borella et al 1999;Barbour et al , 2001. Moreover, δ 18 O p was found to be more sensitive to variation in stomatal conductance than δ 18 O c by a factor of two .…”

Section: Introductionmentioning

confidence: 98%

Oxygen and carbon isotope composition of parasitic plants and their hosts in southwestern Australia

2004

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We measured leaf dry matter delta(18)O and delta(13)C in parasitic plants and their hosts growing in southwestern Australia. Parasite/host pairs included two mistletoe species, three species of holoparasites, and five species of root hemiparasites. Among these parasite functional types, significant variation was observed in parasite/host isotopic differences for both delta(18)O ( P<0.0001, n=65) and delta(13)C ( P<0.0001, n=64). Mistletoes were depleted in both (18)O and (13)C compared to their hosts; parasite/host differences were -4.0 per thousand for delta(18)O ( P<0.0001) and -1.9 per thousand for delta(13)C ( P<0.0001). The lower delta(18)O in mistletoe leaf dry matter compared to their hosts is consistent with the frequently observed high transpiration rates of these parasites. Root hemiparasites were also depleted in (18)O and (13)C compared to their hosts, but not to the same extent as mistletoes; parasite/host differences were -1.0 per thousand for delta(18)O ( P=0.04) and -1.2 per thousand for delta(13)C ( P=0.0006). In contrast to mistletoes and root hemiparasites, holoparasites were enriched in both (18)O and (13)C compared to their hosts; parasite/host differences were +3.0 per thousand for delta(18)O ( P<0.0001) and +1.5 per thousand for delta(13)C ( P=0.02). The enrichment in (18)O for holoparasite dry matter did not result from more enriched tissue water; holoparasite tissue water delta(18)O was less than host leaf water delta(18)O by a difference of -3.8 per thousand when sampled at midday ( P=0.0003). Enrichment of holoparasites in (13)C compared to their hosts is consistent with a generally observed pattern of enrichment in heterotrophic plant tissues. Results provide insights into the ecology of parasitic plants in southwestern Australia; additionally, they provide a context for the formulation of specific hypotheses aimed at elucidating mechanisms underlying isotopic variations among plants.

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“…Enrichment in d 18 O may be enhanced under drought conditions (Yakir and Sternberg 2000). Barbour et al (2001) showed that d 18 O is mostly negatively correlated with stomatal conductance, because changes in transpiration influence the leaf water enrichment by the replenishment of leaf water with unenriched soil water. A mixed d 18 O signal of source and leave/needle water enrichment is stored in the wood and cellulose of the tree rings (Saurer et al 1997b;Roden and Ehleringer 2000).…”

Section: Introductionmentioning

confidence: 99%

Do centennial tree-ring and stable isotope trends of Larix gmelinii (Rupr.) Rupr. indicate increasing water shortage in the Siberian north?

et al. 2009

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Tree-ring width of Larix gmelinii (Rupr.) Rupr., ratios of stable isotopes of C (delta(13)C) and O (delta(18)O) of whole wood and cellulose chronologies were obtained for the northern part of central Siberia (Tura, Russia) for the period 1864-2006. A strong decrease in the isotope ratios of O and C (after atmospheric delta(13)C corrections) and tree-ring width was observed for the period 1967-2005, while weather station data show a decrease in July precipitation, along with increasing July air temperature and vapor pressure deficit (VPD). Temperature at the end of May and the whole month of June mainly determines tree radial growth and marks the beginning of the vegetation period in this region. A positive correlation between tree-ring width and July precipitation was found for the calibration period 1929-2005. Positive significant correlations between C isotope chronologies and temperatures of June and July were found for whole wood and cellulose and negative relationships with July precipitation. These relationships are strengthened when the likely physiological response of trees to increased CO(2) is taken into account (by applying a recently developed delta(13)C correction). For the O isotope ratios, positive relationships with annual temperature, VPD of July and a negative correlation with annual precipitation were observed. The delta(18)O in tree rings may reflect annual rather than summer temperatures, due to the late melting of the winter snow and its contribution to the tree water supply in summer. We observed a clear change in the isotope and climate trends after the 1960s, resulting in a drastic change in the relationship between C and O isotope ratios from a negative to a positive correlation. According to isotope fractionation models, this indicates reduced stomatal conductance at a relatively constant photosynthetic rate, as a response of trees to water deficit for the last half century in this permafrost region.

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Correlations between oxygen isotope ratios of wood constituents of Quercus and Pinus samples from around the world

Cited by 126 publications

References 25 publications

Variation in leaf physiology of Salix arctica within and across ecosystems in the High Arctic: test of a dual isotope (Δ13C and Δ18O) conceptual model

Variation in leaf physiology of Salix arctica within and across ecosystems in the High Arctic: test of a dual isotope (Δ13C and Δ18O) conceptual model

Oxygen and carbon isotope composition of parasitic plants and their hosts in southwestern Australia

Do centennial tree-ring and stable isotope trends of Larix gmelinii (Rupr.) Rupr. indicate increasing water shortage in the Siberian north?

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