Carbon isotope compositions of terrestrial C3 plants as indicators of (paleo)ecology and (paleo)climate
Carbon isotope compositions of terrestrial C3 plants as indicators of (paleo)ecology and (paleo)climate
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DOI：
10.1073/pnas.1004933107
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发表时间：
2010-11-16
影响因子：
11.1
通讯作者：
Kohn, Matthew J.
中科院分区：
文献类型：
--
作者：
Kohn, Matthew J.
对所有 C3 植物类型的现代碳同位素组成的广泛汇编显示，随着平均年降水量 (MAP) 的减少，δ C-13 单调增加，这与以前的模型不同。温度、海拔或纬度的修正值小于之前的估计值。经过对海拔、纬度和大气 CO2 δ C-13 的校正后，这些数据可以对 7-8 百万年前 (Ma) 之前或最近的中高纬度地区以 C3 植物为主的生态系统的 MAP、古饮食和古生态进行精确解释。已发表的二十九项古生物学研究表明，尽管湿生态系统也有代表性，但保护或科学方面对干燥生态系统存在偏见。 7-8 Ma 之前缺乏 C4 植物的明确同位素证据，4.4 Ma 的原始人类生态系统没有显示茂密森林的同位素证据。考虑到全球植物生物量，C3 植物的平均 Delta C-13 通常被高估约 2%。
A broad compilation of modern carbon isotope compositions in all C3 plant types shows a monotonic increase in delta C-13 with decreasing mean annual precipitation (MAP) that differs from previous models. Corrections for temperature, altitude, or latitude are smaller than previously estimated. As corrected for altitude, latitude, and the delta C-13 of atmospheric CO2, these data permit refined interpretation of MAP, paleodiet, and paleoecology of ecosystems dominated by C3 plants, either prior to 7-8 million years ago (Ma), or more recently at mid-to high latitudes. Twenty-nine published paleontological studies suggest preservational or scientific bias toward dry ecosystems, although wet ecosystems are also represented. Unambiguous isotopic evidence for C4 plants is lacking prior to 7-8 Ma, and hominid ecosystems at 4.4 Ma show no isotopic evidence for dense forests. Consideration of global plant biomass indicates that average delta C-13 of C3 plants is commonly overestimated by approximately 2%.