Altitudinal variation in <Emphasis Type="Italic">Ginkgo</Emphasis> leaf characters: Clues to paleoelevation reconstruction |
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Authors: | SanPing Xie BaiNian Sun DeFei Yan BaoXia Du |
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Institution: | (1) Institute for Geosciences, University of Tübingen, Sigwartstrasse 10, 72076 Tübingen, Germany |
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Abstract: | After detailed studies of leaf area, leaf shape index, petiole length, stomatal density, stomatal index, and carbon isotope
discrimination of Ginkgo biloba L., growing in Northwest China, the change trends of these parameters with an altitude gradient and their differences between
sun and shade leaves were assessed. The results show that leaf area, petiole length, and stomatal parameters have no obvious
linear relationship with altitude, but the carbon isotope discrimination shows a negative correlation with altitude, which
has a potential to be an applicable paleo-altimeter. The results also suggest that the differences in stomatal density and
stomatal index between sun and shade leaves had more influence on paleoelevation reconstruction than that in other parameters.
Based on the linear and nonlinear correlations between carbon isotope discrimination and altitude, the paleoelevation evolution
during the Middle Jurassic of the Yaojie Basin, Lanzhou in Gansu Province was estimated. The results show that the paleoelevation
of the Yaojie Basin increased at first, and then decreased from the Aalenian to the early Bajocian and then to the late Bajocian
in the Middle Jurassic. |
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Keywords: | |
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