Stable carbon isotope analysis of Cedrus atlantica pollen as an indicator of moisture availability
Stable carbon isotope analysis of Cedrus atlantica pollen as an indicator of moisture availability
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DOI：
10.1016/j.revpalbo.2017.04.008
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发表时间：
2017-09-01
影响因子：
1.9
通讯作者：
Ilmen, Rachid
中科院分区：
文献类型：
--
作者：
Bell, Benjamin A.;Fletcher, William J.;Ilmen, Rachid
与植物组织的同位素分析相比，花粉的稳定碳同位素分析为在更长的时间尺度上重建环境中过去的水分可用性提供了潜力。在这里，我们表明，Cedrus atlantica的花粉，孢粉素，叶和茎组织的碳同位素组成（δ C-13）的强烈相关。未处理的花粉δ C-13与孢粉素δ C-13具有显著的线性关系（r（2）= 0.97，p < 0.0001），其C-13相对贫乏，平均1.5份/千。孢粉素的碳同位素区分度（δ C-13）与年平均降水量（r（2）= 0.54，p < 0.001）和夏季降水量（r（2）= 0.63，p < 0.0001）有关。年平均降水量每增加100 mm，孢粉素Delta C-13含量增加0.52 ppm，或每100 mm夏季降水增加1.4 ppm。孢粉素C-13与长期年scPDSI（r（2）= 0.86，p < 0.0001）和夏季scPDSI（r（2）= 0.86，p < 0.001）干旱指数之间存在较强的相关性，随着干旱程度的增加，C-13的含量降低。这些关系表明，C。大西洋花粉化石可作为重建西北非洲夏季水分供应的定量指标。(C)2017作者由爱思唯尔公司出版。这是一篇开放获取的文章，使用CC BY许可证（http：//creativecommons.org/licenses/by/4.0/）。
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 (delta C-13) of pollen, sporopollenin, leaf and stem tissues of Cedrus atlantica are strongly related. Untreated pollen delta C-13 has a significant linear relationship with sporopollenin delta C-13 (r(2) = 0.97, p < 0.0001) which is relatively depleted in C-13 by an average 1.5 parts per thousand. Carbon isotope discrimination (Delta C-13) by sporopollenin (derived from pollen delta C-13 values) is related to mean annual (r(2) = 0.54, p < 0.001) and summer precipitation (r(2) = 0.63, p < 0.0001). A 100 mm increase in mean annual precipitation results in sporopollenin Delta C-13 increasing by 0.52 parts per thousand, or by 1.4 parts per thousand per 100 mm summer precipitation. There is a stronger relationship between sporopollenin Delta C-13 and long-term annual scPDSI (r(2) = 0.86, p < 0.0001) and summer scPDSI (r(2) = 0.86, p < 0.001) aridity indexes, with reduced Delta C-13 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. (C) 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).