|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5788363||1414239||2017||12 صفحه PDF||ندارد||دانلود کنید|
â¢New stable carbon isotope analysis of modern Cedrus atlantica pollenâ¢Isotopic composition of pollen, sporopollenin, leaf and stem significantly relatedâ¢Sporopollenin Î13C significantly related to water availability and drought stressâ¢Potential to use Î13C signal for quantitative palaeoclimatic reconstructions
Stable carbon isotope analysis of pollen provides potential for reconstruction of past moisture availability in the environment on longer time-scales compared to isotope analysis of plant tissue. Here we show that the carbon isotopic compositions (Î´13C) of pollen, sporopollenin, leaf and stem tissues of Cedrus atlantica are strongly related. Untreated pollen Î´13C has a significant linear relationship with sporopollenin Î´13C (r2Â =Â 0.97, pÂ <Â 0.0001) which is relatively depleted in 13C by an average 1.5â°. Carbon isotope discrimination (Î13C) by sporopollenin (derived from pollen Î´13C values) is related to mean annual (r2Â =Â 0.54, pÂ <Â 0.001) and summer precipitation (r2Â =Â 0.63, pÂ <Â 0.0001). A 100Â mm increase in mean annual precipitation results in sporopollenin Î13C increasing by 0.52â°, or by 1.4â° per 100Â mm summer precipitation. There is a stronger relationship between sporopollenin Î13C and long-term annual scPDSI (r2Â =Â 0.86, pÂ <Â 0.0001) and summer scPDSI (r2Â =Â 0.86, pÂ <Â 0.001) aridity indexes, with reduced Î13C as aridity increases. These relationships suggest that stable carbon isotope analysis of C. atlantica fossil pollen could be used as a quantitative proxy for the reconstruction of summer moisture availability in Northwest Africa.
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Journal: Review of Palaeobotany and Palynology - Volume 244, September 2017, Pages 128-139