The carbon fertilization effect over a century of anthropogenic CO 2 emissions: higher intracellular CO 2 and more drought resistance among invasive and native grass species contrasts with increased water use efficiency for woody plants in the US Southwest

From 1890 to 2015, anthropogenic carbon dioxide emissions have increased atmospheric CO concentrations from 270 to 400 mol mol . The effect of increased carbon emissions on plant growth and reproduction has been the subject of study of free-air CO enrichment (FACE) experiments. These experiments hav...

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Veröffentlicht in:Global change biology 2017-02, Vol.23 (2), p.782-792
Hauptverfasser: Drake, Brandon L, Hanson, David T, Lowrey, Timothy K, Sharp, Zachary D
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container_title Global change biology
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Hanson, David T
Lowrey, Timothy K
Sharp, Zachary D
description From 1890 to 2015, anthropogenic carbon dioxide emissions have increased atmospheric CO concentrations from 270 to 400 mol mol . The effect of increased carbon emissions on plant growth and reproduction has been the subject of study of free-air CO enrichment (FACE) experiments. These experiments have found (i) an increase in internal CO partial pressure (c ) alongside acclimation of photosynthetic capacity, (ii) variable decreases in stomatal conductance, and (iii) that increases in yield do not increase commensurate with CO concentrations. Our data set, which includes a 115-year-long selection of grasses collected in New Mexico since 1892, is consistent with an increased c as a response to historical CO increase in the atmosphere, with invasive species showing the largest increase. Comparison with Palmer Drought Sensitivity Index (PDSI) for New Mexico indicates a moderate correlation with Δ C (r  = 0.32, P 
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The effect of increased carbon emissions on plant growth and reproduction has been the subject of study of free-air CO enrichment (FACE) experiments. These experiments have found (i) an increase in internal CO partial pressure (c ) alongside acclimation of photosynthetic capacity, (ii) variable decreases in stomatal conductance, and (iii) that increases in yield do not increase commensurate with CO concentrations. Our data set, which includes a 115-year-long selection of grasses collected in New Mexico since 1892, is consistent with an increased c as a response to historical CO increase in the atmosphere, with invasive species showing the largest increase. Comparison with Palmer Drought Sensitivity Index (PDSI) for New Mexico indicates a moderate correlation with Δ C (r  = 0.32, P &lt; 0.01) before 1950, with no correlation (r  = 0.00, P = 0.91) after 1950. These results indicate that increased c may have conferred some drought resistance to these grasses through increased availability of CO in the event of reduced stomatal conductance in response to short-term water shortage. Comparison with C trees from arid environments (Pinus longaeva and Pinus edulis in the US Southwest) as well as from wetter environments (Bromus and Poa grasses in New Mexico) suggests differing responses based on environment; arid environments in New Mexico see increased intrinsic water use efficiency (WUE) in response to historic elevated CO while wetter environments see increased c . 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The effect of increased carbon emissions on plant growth and reproduction has been the subject of study of free-air CO enrichment (FACE) experiments. These experiments have found (i) an increase in internal CO partial pressure (c ) alongside acclimation of photosynthetic capacity, (ii) variable decreases in stomatal conductance, and (iii) that increases in yield do not increase commensurate with CO concentrations. Our data set, which includes a 115-year-long selection of grasses collected in New Mexico since 1892, is consistent with an increased c as a response to historical CO increase in the atmosphere, with invasive species showing the largest increase. Comparison with Palmer Drought Sensitivity Index (PDSI) for New Mexico indicates a moderate correlation with Δ C (r  = 0.32, P &lt; 0.01) before 1950, with no correlation (r  = 0.00, P = 0.91) after 1950. 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These results indicate that increased c may have conferred some drought resistance to these grasses through increased availability of CO in the event of reduced stomatal conductance in response to short-term water shortage. Comparison with C trees from arid environments (Pinus longaeva and Pinus edulis in the US Southwest) as well as from wetter environments (Bromus and Poa grasses in New Mexico) suggests differing responses based on environment; arid environments in New Mexico see increased intrinsic water use efficiency (WUE) in response to historic elevated CO while wetter environments see increased c . 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subjects Carbon
Carbon Dioxide
Droughts
New Mexico
Poaceae - physiology
Water
title The carbon fertilization effect over a century of anthropogenic CO 2 emissions: higher intracellular CO 2 and more drought resistance among invasive and native grass species contrasts with increased water use efficiency for woody plants in the US Southwest
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