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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Carbon isotope compositions of terrestrial C3 plants as indicators of (paleo)ecology and (paleo)climate
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Carbon isotope compositions of terrestrial C3 plants as indicators of (paleo)ecology and (paleo)climate

机译：陆地C3植物的碳同位素组成可作为（古）生态和（古）气候的指标

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A broad compilation of modern carbon isotope compositions in all C3 plant types shows a monotonic increase in δ~(13)C 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 δ~(13)C of atmospheric CO_2, 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 δ~(13)C of C3 plants is commonly overestimated by approximately 2‰ .
机译：对所有C3植物类型中现代碳同位素组成的广泛汇编显示，δ〜（13）C呈单调增加，而平均年降水量（MAP）却有所减少，这与以前的模型不同。对温度，海拔或纬度的校正小于以前的估计。经过高度，纬度和大气CO_2δ〜（13）C的校正，这些数据可以对7-8百万年前（Ma）之前由C3植物为主的生态系统的MAP，古地理和古生态学进行精细的解释。 ，或者最近在中高纬度地区。尽管已有湿地生态系统的代表，但已有29篇已发表的古生物学研究表明，对干旱生态系统的保存或科学偏见。在7-8 Ma之前，缺乏C4植物的明确同位素证据，而在4.4 Ma的原始生态系统中，没有茂密森林的同位素证据。考虑到全球植物生物量，通常会高估C3植物的平均δ〜（13）C约2‰。

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