Hydrogen isotopic variability in leaf waxes among terrestrial and aquatic plants around Blood Pond, Massachusetts (USA)

Hou, Juzhi; D'Andrea, W. J.; MacDonald, Daniel G.; Huang, Yongsong

doi:10.1016/j.orggeochem.2006.12.009

Cited by 207 publications

(194 citation statements)

References 19 publications

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“…These precipitation isoscape models indicate that variations in humidity and leaf-water δ 2 H values may not be needed in all cases to reconcile these apparent fractionations. For example, Hou et al (42) found leaf-wax δ 2 H values varied by nearly 70‰ at a single locality in Massachusetts, with C 3 grasses more depleted in 2 H than other functional types (i.e., trees, herbs, and shrubs). In this case, differences in physiology between C 3 dicots and monocots were suggested to be the controlling factor of apparent fractionation.…”

Section: In Deciduous Species δ 2 H Values Reflect Plant Environment mentioning

confidence: 99%

Leaf-wax n -alkanes record the plant–water environment at leaf flush

Tipple

Berke

Doman

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

173

103

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Leaf-wax n-alkanes 2 H/ 1 H ratios are widely used as a proxy in climate reconstruction. Although the broad nature of the relationship between n-alkanes δ 2 H values and climate is appreciated, the quantitative details of the proxy remain elusive. To examine these details under natural environmental conditions, we studied a riparian broadleaf angiosperm species, Populus angustifolia, growing on water with a constant δ 2 H value and monitored the δ 2 H values of leaf-wax n-alkanes and of stem, leaf, stream, and atmospheric waters throughout the entire growing season. Here we found the δ 2 H values of leaf-wax n-alkanes recorded only a 2-wk period during leaf flush and did not vary for the 19 weeks thereafter when leaves remained active. We found δ 2 H values of leaf-wax n-alkanes of P. angustifolia record conditions earlier in the season rather than fully integrating the entire growing season. Using these data, we modeled precipitation δ 2 H values during the time of wax synthesis. We observed that the isotope ratios of this precipitation generally were 2 H-enriched compared with mean annual precipitation. This model provides a mechanistic basis of the often-observed 2 H-enrichment from the expected fractionation values in studies of broadleaf angiosperm leaf-wax δ 2 H. In addition, these findings may have implications for the spatial and temporal uses of n-alkane δ 2 H values in paleoapplications; when both plant community and growth form are known, this study allows the isolation of the precipitation dynamics of individual periods of the growing season.biomarkers | compound-specific isotope analysis | geographic information system | isoscape | stable isotopes S table isotopes serve as tracers and integrators of both environmental and physiological signals within plant materials. Terrestrial plant leaf waxes (i.e., n-alkanes, n-acids, and others) and their isotope ratios have attracted much interest as a higher plant-specific biomarker for paleoclimate reconstruction (1), because these compounds are easily identified and isolated from a variety of geologic materials and are relatively robust to geologic alteration (2). The environmental information recorded in hydrogen isotope ratios of leaf waxes have become a prevalent proxy to reconstruct ancient climates (3-5), mountain building events (6, 7), and floral transitions (8). However, critical questions related to the interpretation of ancient higher plant biomarkers remain unanswered, especially with respect to the extent of the leaf life cycle recorded by this proxy.Environmental and climate transect studies have shown that δ 2 H values of higher plant n-alkanes and environmental waters are correlated (9, 10), but temporal observations of δ 2 H values of n-alkanes have produced conflicting data on the nature of this relationship (11-15) that require clarification to elucidate how δ 2 H values of ancient n-alkanes can be interpreted. To reconcile these issues and to provide the critical constraints for climate reconstructions using δ 2 H values of n-alkanes, car...

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Section: In Deciduous Species δ 2 H Values Reflect Plant Environment mentioning

confidence: 99%

Leaf-wax n -alkanes record the plant–water environment at leaf flush

Tipple

Berke

Doman

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

173

103

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“…δD of terrigenous n-alkanes in Tibet record precipitation signal 335 The biosynthetic isotope fractionation for n-alkanes is around -160‰ (Sachse et al, 2004;Sessions et al, 1999). Besides the δD values of precipitation, some other factors such as relative humidity, plant class, plant taxonomy (woody plants or grasses), photosynthetic type (C3 or C4) can modify the hydrogen isotopic signal of plant leaf n-alkanes (Chikaraishi and Naraoka, 2003;Hou et al, 2007;Liu and Huang, 2005;Smith and Freeman, 2006). These factors modify the δD values of n-alkanes by modifying the δD values of the H source, which was used for n-alkanes biosynthesis, through evaporation from soil and evapotranspiration from leaf (Flanagan et al, 1991).…”

Section: Hydrogen Isotope Fractionation Between Precipitation and Termentioning

confidence: 99%

“…But this possibility might not be clarified in this study and further investigation is required on the isotopic fractionation between leaf water and nalkanes and the isotopic fractionation between soil water and n-alkanes in the Tibetan Plateau. The dominant vegetation along the European and Tibetan transect are deciduous trees (Sachse et al, 2006) and steppe respectively, and trees might have less negative δD values than the cooccurring grasses (Hou et al, 2007;Liu et al, 2006), so the difference in ecological types of vegetation might not be the reason for the smaller fractionation along the Tibetan transect.…”

Section: Hydrogen Isotope Fractionation Between Precipitation and Termentioning

confidence: 99%

Hydrogen isotope ratios of terrigenous n-alkanes in lacustrine surface sediment of the Tibetan Plateau record the precipitation signal

Zhonghuan

Mügler

et al. 2008

Geochem. J.

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Hydrogen isotope ratios were measured on terrigenous alkanes (n-C 25 to n-C 31 ) extracted from recent lake surface sediments from the climatically and environmentally distinct basins Qiangyong Glacier Lake, Yamzho Lake, Nam Co Lake, Keluke Lake and Xiao Qaidam Lake along a S-N transect in the Tibetan Plateau to explore the climatic implication of these biomarkers. δD values of these n-alkanes are compared to that of precipitation spanning a wide range from -167‰ to -51‰ and clearly correlate with δD values of meteoric water, indicating that terrigenous alkanes record the precipitation signal. The fractionation between precipitation and n-C 25 , n-C 27 alkanes cover a range from -45‰ to -70‰ whilst that between precipitation and n-C 29 , n-C 31 alkanes varies from -70‰ to -95‰, both being fairly constant along the S-N Tibetan transect with the mean at -57‰ and -82‰ respectively. By comparison with the fractionation of -130‰ along the S-N European transect, it implies that the hydrogen isotopic fractionation between meteoric water and terrestrial n-alkanes along the Tibetan transect represent distinct character.

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“…除了降水 δD 值, 还有其它一些因素, 例如相对湿度、植被类型(木本或草本)、植物物种、光合作用途径(C 3 或 C 4 )等都能改变植物中正构烷烃 δD 值 [7,[32][33][34] . 这些因素通过影响土壤水分的蒸发作用和叶片表层水分的蒸发蒸腾作用来改变用于合成正构烷烃的氢源 δD 值, 进而改变所合成的正构烷烃 δD 值 [35] .…”

Section: 陆源沉积正构烷烃与大气降水间氢同位素分馏unclassified

“…与植物体所含的正构烷烃之间以及土壤水分与植物体所含的正构烷烃之间的氢同位素分馏状况. 欧洲南北断面的主要植被是落叶树 [15] , 而青藏高原南北断面的主要植被是草原, 又因为树的正构烷烃的 δD 值要比同地区草的正构烷烃的 δD 值更正一些 [22,33] …”

Section: 陆源沉积正构烷烃与大气降水间氢同位素分馏unclassified

Climatic implication of hydrogen isotope ratios of terrigenous n-alkanes in lacustrine surface sediment of the Tibetan Plateau

Zhong-huan

Xu²,

Mvgler

et al. 2008

Journal of Lake Sciences

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δD values of terrigenous n-alkanes (n-C 25 , n-C 27 , n-C 29 and n-C 31 ) extracted from recent lake surface sediments of Lake Qiangyong Glacier, Lake Kongmu Co, Lake Nam Co, Lake Keluke and Lake Xiao Qaidam along the S-N transect of Tibetan Plateau are compared to those of precipitation spanning a wide range from -167‰ to -51‰ and clearly correlate with δD values of meteoric water during the growth, indicating that terrigenous n-alkanes record the precipitation signal during the growth. The isotopic fractionation between precipitation and alkanes of n-C 25 and n-C 27 cover a range from -45‰ to -70‰ whilst that between precipitation and alkanes of n-C 29 and n-C 31 vary from -70‰ to -95‰, both being fairly constant along the S-N Tibetan transect with the mean at -57‰ and -82‰, respectively. By comparison with the apparent isotope fractionation of -130‰ along the S-N European transect, it implies that the apparent hydrogen isotopic fractionation between meteoric water and terrestrial n-alkanes along the Tibetan transect is much smaller.

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Hydrogen isotopic variability in leaf waxes among terrestrial and aquatic plants around Blood Pond, Massachusetts (USA)

Cited by 207 publications

References 19 publications

Leaf-wax n -alkanes record the plant–water environment at leaf flush

Leaf-wax n -alkanes record the plant–water environment at leaf flush

Hydrogen isotope ratios of terrigenous n-alkanes in lacustrine surface sediment of the Tibetan Plateau record the precipitation signal

Climatic implication of hydrogen isotope ratios of terrigenous n-alkanes in lacustrine surface sediment of the Tibetan Plateau

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