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C3 plant carbon isotope discrimination does not respond to CO2 concentration on decadal to centennial timescales.

Identifieur interne : 000536 ( Main/Exploration ); précédent : 000535; suivant : 000537

C3 plant carbon isotope discrimination does not respond to CO2 concentration on decadal to centennial timescales.

Auteurs : Rebekah A. Stein [États-Unis] ; Nathan D. Sheldon [États-Unis] ; Selena Y. Smith [États-Unis]

Source :

RBID : pubmed:33098664

Abstract

(1) Plant carbon isotope discrimination is complex, and could be driven by climate, evolution, and/or edaphic factors. We tested the climate drivers of carbon isotope discrimination in modern and historical plant chemistry, and focus in particular on the relationship between rising [CO2 ] over Industrialization and carbon isotope discrimination. (2) We generated temporal records of plant carbon isotopes from museum specimens collected over a climo-sequence to test plant response to climate and atmospheric change over the past 200 years (including Pinus strobus, Platycladus orientalis, Populus tremuloides, Thuja koraiensis, Thuja occidentalis, Thuja plicata, Thuja standishii, Thuja sutchuenensis). We aggregated our results with a meta-analysis of a wide range of C3 plants to do a comprehensive study of the distribution of carbon isotope discrimination and values among different plant types. (3) We show that climate variables (e.g. mean annual precipitation, temperature, and key to this study, CO2 in the atmosphere) do not drive carbon isotope discrimination. (4) Plant isotope discrimination is intrinsic to each taxon, and could link phylogenetic relationships and adaptation to climate quantitatively and over ecological to geological time scales.

DOI: 10.1111/nph.17030
PubMed: 33098664


Affiliations:


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<sub>2</sub>
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<sub>3</sub>
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<sub>2</sub>
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] over Industrialization and carbon isotope discrimination. (2) We generated temporal records of plant carbon isotopes from museum specimens collected over a climo-sequence to test plant response to climate and atmospheric change over the past 200 years (including Pinus strobus, Platycladus orientalis, Populus tremuloides, Thuja koraiensis, Thuja occidentalis, Thuja plicata, Thuja standishii, Thuja sutchuenensis). We aggregated our results with a meta-analysis of a wide range of C
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