叶片内总体碳同位素变异

IF 1.5 4区地球科学 Q2 GEOLOGY

Palaios Pub Date : 2022-08-25 DOI:10.2110/palo.2022.001

D. Royer, M. Hren

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引用次数: 0

摘要

摘要：树叶化石的稳定碳同位素组成（δ13C）是一种简单而常见的测量方法，可以提供有关古生理、古生态和古气候的信息。δ13C的变化通常通过叶片进行评估；人们对叶片内部的方差知之甚少，这是一个潜在的不确定性来源。在这里，我们系统地分析了10个树种新鲜叶片中体积δ13C的空间模式（每个物种两片叶片；每个叶片21或22次分析）。我们发现，含有中脉组织的样本的δ13C明显高于同一叶片的非中脉组织（中位数=+0.85‰），仅含有中脉的样本偏移了3.01‰。非中脉样本的变化较小，单个叶片内的典型范围<1‰，并且没有显示出任何一致的空间模式。在无法分析整个化石叶子的情况下，我们建议尽可能多地对没有主脉的随机区域进行采样。

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BULK CARBON ISOTOPIC VARIABILITY WITHIN LEAVES

Abstract: The stable carbon isotopic composition (δ13C) of fossil leaves is a simple and common measurement that provides information about paleophysiology, paleoecology, and paleoclimate. Variance in δ13C is typically assessed across leaves; comparatively little is known about variance within leaves, a potential source of unquantified uncertainty. Here we systematically analyze the spatial patterns of bulk δ13C in fresh leaves of 10 tree species (two leaves per species; 21 or 22 analyses per leaf). We find that samples containing midvein tissue are markedly higher in δ13C than non-midvein tissue from the same leaf (median = +0.85‰), with samples containing only midvein tissue offset by as much as +3.01‰. The non-midvein samples are less variable—the typical range within a single leaf is <1‰—and do not show any consistent spatial patterns. In cases where whole fossil leaves cannot be analyzed, we recommend sampling as many randomized areas without major veins as is feasible.

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来源期刊

Palaios 地学-地质学

CiteScore

2.80

自引率

12.50%

发文量

审稿时长

6 months

期刊介绍： PALAIOS is a monthly journal, founded in 1986, dedicated to emphasizing the impact of life on Earth''s history as recorded in the paleontological and sedimentological records. PALAIOS disseminates information to an international spectrum of geologists and biologists interested in a broad range of topics, including, but not limited to, biogeochemistry, ichnology, paleoclimatology, paleoecology, paleoceanography, sedimentology, stratigraphy, geomicrobiology, paleobiogeochemistry, and astrobiology. PALAIOS publishes original papers that emphasize using paleontology to answer important geological and biological questions that further our understanding of Earth history. Accordingly, manuscripts whose subject matter and conclusions have broader geologic implications are much more likely to be selected for publication. Given that the purpose of PALAIOS is to generate enthusiasm for paleontology among a broad spectrum of readers, the editors request the following: titles that generate immediate interest; abstracts that emphasize important conclusions; illustrations of professional caliber used in place of words; and lively, yet scholarly, text.