6533b86cfe1ef96bd12c8948

RESEARCH PRODUCT

δ2H, δ13C and δ18O from whole wood,α-cellulose and lignin methoxyl groups inPinus sylvestris: a multi-parameter approach

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Novel tree ring parameters – δ13C and δ2H from methoxyl groups – have been developed to reconstruct palaeoclimate. Tests with δ13C and δ18O 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) δ13C and δ18O from whole wood and cellulose and (ii) δ13C and δ2H 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, δ13C from methoxyl groups showed a different and overall lower response to climate parameters. On the other hand, δ2H 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 ...