title: δ²H, δ¹³C and δ¹⁸O from whole wood, α-cellulose and lignin methoxyl groups in Pinus sylvestris: a multi-parameter approach.
abstract: Novel tree ring parameters - δ(13)C and δ(2)H from methoxyl groups - have been developed to reconstruct palaeoclimate. Tests with δ(13)C and δ(18)O derived from whole wood and cellulose samples, however, indicated differences in the isotopic composition and climate signal, depending on the extracted wood component. We assess this signal dependency by analysing (i) δ(13)C and δ(18)O from whole wood and cellulose and (ii) δ(13)C and δ(2)H from methoxyl groups, using Pinus sylvestris L. growing near Altenkirchen (Germany). Results indicate significant correlations among the time series derived from whole wood, cellulose, and lignin methoxyl groups. Compared with the whole wood samples, δ(13)C from methoxyl groups showed a different and overall lower response to climate parameters. On the other hand, δ(2)H from methoxyl groups showed high correlations with temperature and was also correlated with ring width, indicating its potential as a temperature proxy. Isotope time series with the highest correlation with climatic parameter were: (i) whole wood and cellulose δ(13)C with growing season precipitation and summer temperature; (ii) methoxyl groups with spring precipitation; (iii) whole wood and cellulose δ(18)O correlates with annual evapotranspiration and water balance; and (iv) methoxyl group δ(2)H with spring temperatures. These findings reveal that multiple climate elements can be reconstructed from different wood components and that whole wood proxies perform comparably to cellulose time series.
authors.affiliation: a Department of Geography , Johannes Gutenberg University , Mainz , Germany.|b Department of Geobotany , University of Trier , Trier , Germany.
authors.forename: Maria
authors.initials: M
authors.lastname: Mischel
authors.affiliation: a Department of Geography , Johannes Gutenberg University , Mainz , Germany.
authors.forename: Jan
authors.initials: J
authors.lastname: Esper
authors.affiliation: c Institute of Earth Sciences , University of Heidelberg , Heidelberg , Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Keppler
authors.affiliation: c Institute of Earth Sciences , University of Heidelberg , Heidelberg , Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Greule
authors.affiliation: b Department of Geobotany , University of Trier , Trier , Germany.
authors.forename: Willy
authors.initials: W
authors.lastname: Werner
mesh_terms: D002247:Carbon Isotopes / Q000032:analysis; D002482:Cellulose / Q000032:analysis* / Q000737:chemistry; D003903:Deuterium / Q000032:analysis; D005858:Germany; D007554:Isotopes / Q000032:analysis*; D008031:Lignin / Q000032:analysis* / Q000737:chemistry; D055904:Meteorology / Q000379:methods*; D010103:Oxygen Isotopes / Q000032:analysis; D041605:Pinus sylvestris / Q000737:chemistry*; D014934:Wood / Q000032:analysis* / Q000737:chemistry
chemical_list: D002247:Carbon Isotopes; D007554:Isotopes; D010103:Oxygen Isotopes; D002482:Cellulose; D008031:Lignin; D003903:Deuterium
keywords: carbon-13; climate; dendroclimatology; hydrogen-2; isotope ecology; oxygen-18; pine trees; tree rings; wood components