Low and contrasting impacts of vegetation CO<sub>2</sub> fertilization on global terrestrial runoff over 1982–2010: accounting for aboveground and belowground vegetation–CO<sub>2</sub> effects
<p>Elevation in atmospheric carbon dioxide concentration (eCO<span class="inline-formula"><sub>2</sub></span>) affects vegetation water use, with consequent impacts on terrestrial runoff (<span class="inline-formula"><i>Q</i></sp...
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Copernicus Publications
2021-06-01
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Series: | Hydrology and Earth System Sciences |
Online Access: | https://hess.copernicus.org/articles/25/3411/2021/hess-25-3411-2021.pdf |
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doaj-fed23f042dfc4c729272a9b757edd4b8 |
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record_format |
Article |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Y. Yang T. R. McVicar T. R. McVicar D. Yang Y. Zhang S. Piao S. Peng H. E. Beck |
spellingShingle |
Y. Yang T. R. McVicar T. R. McVicar D. Yang Y. Zhang S. Piao S. Peng H. E. Beck Low and contrasting impacts of vegetation CO<sub>2</sub> fertilization on global terrestrial runoff over 1982–2010: accounting for aboveground and belowground vegetation–CO<sub>2</sub> effects Hydrology and Earth System Sciences |
author_facet |
Y. Yang T. R. McVicar T. R. McVicar D. Yang Y. Zhang S. Piao S. Peng H. E. Beck |
author_sort |
Y. Yang |
title |
Low and contrasting impacts of vegetation CO<sub>2</sub> fertilization on global terrestrial runoff over 1982–2010: accounting for aboveground and belowground vegetation–CO<sub>2</sub> effects |
title_short |
Low and contrasting impacts of vegetation CO<sub>2</sub> fertilization on global terrestrial runoff over 1982–2010: accounting for aboveground and belowground vegetation–CO<sub>2</sub> effects |
title_full |
Low and contrasting impacts of vegetation CO<sub>2</sub> fertilization on global terrestrial runoff over 1982–2010: accounting for aboveground and belowground vegetation–CO<sub>2</sub> effects |
title_fullStr |
Low and contrasting impacts of vegetation CO<sub>2</sub> fertilization on global terrestrial runoff over 1982–2010: accounting for aboveground and belowground vegetation–CO<sub>2</sub> effects |
title_full_unstemmed |
Low and contrasting impacts of vegetation CO<sub>2</sub> fertilization on global terrestrial runoff over 1982–2010: accounting for aboveground and belowground vegetation–CO<sub>2</sub> effects |
title_sort |
low and contrasting impacts of vegetation co<sub>2</sub> fertilization on global terrestrial runoff over 1982–2010: accounting for aboveground and belowground vegetation–co<sub>2</sub> effects |
publisher |
Copernicus Publications |
series |
Hydrology and Earth System Sciences |
issn |
1027-5606 1607-7938 |
publishDate |
2021-06-01 |
description |
<p>Elevation in atmospheric carbon dioxide concentration (eCO<span class="inline-formula"><sub>2</sub></span>)
affects vegetation water use, with consequent impacts on terrestrial runoff
(<span class="inline-formula"><i>Q</i></span>). However, the sign and magnitude of the eCO<span class="inline-formula"><sub>2</sub></span> effect on <span class="inline-formula"><i>Q</i></span> are still
contentious. This is partly due to eCO<span class="inline-formula"><sub>2</sub></span>-induced changes in vegetation
water use having opposing responses at the leaf scale (i.e., water-saving effect caused by
partially stomatal closure) and the canopy scale (i.e., water-consuming
induced by foliage cover increase), leading to highly debated conclusions
among existing studies. In addition, none of the existing studies explicitly
account for eCO<span class="inline-formula"><sub>2</sub></span>-induced changes to plant rooting depth that is
overwhelmingly found in experimental observations. Here we develop an
analytical ecohydrological framework that includes the effects of eCO<span class="inline-formula"><sub>2</sub></span>
on plant leaf, canopy density, and rooting characteristics to attribute
changes in <span class="inline-formula"><i>Q</i></span> and to detect the eCO<span class="inline-formula"><sub>2</sub></span> signal on <span class="inline-formula"><i>Q</i></span> via vegetation feedbacks over
1982–2010. Globally, we detect a very small decrease of <span class="inline-formula"><i>Q</i></span> induced by
eCO<span class="inline-formula"><sub>2</sub></span> during 1982–2010 (<span class="inline-formula">−</span>1.7 %). Locally, we find a small positive
trend (<span class="inline-formula"><i>p</i></span> <span class="inline-formula"><i><</i></span> 0.01) in the <span class="inline-formula"><i>Q</i></span>–eCO<span class="inline-formula"><sub>2</sub></span> response along a resource
availability (<span class="inline-formula"><i>β</i></span>) gradient. Specifically, the <span class="inline-formula"><i>Q</i></span>–eCO<span class="inline-formula"><sub>2</sub></span> response is
found to be negative (i.e., eCO<span class="inline-formula"><sub>2</sub></span> reduces <span class="inline-formula"><i>Q</i></span>) in low-<span class="inline-formula"><i>β</i></span> regions
(typically dry and/or cold) and gradually changes to a small positive
response (i.e., eCO<span class="inline-formula"><sub>2</sub></span> increases <span class="inline-formula"><i>Q</i></span>) in high-<span class="inline-formula"><i>β</i></span> areas (typically warm
and humid). Our findings suggest a minor role of eCO<span class="inline-formula"><sub>2</sub></span> on changes in
global <span class="inline-formula"><i>Q</i></span> over 1982–2010, yet we highlight that a negative <span class="inline-formula"><i>Q</i></span>–eCO<span class="inline-formula"><sub>2</sub></span> response in
semiarid and arid regions may further reduce the limited water resource
there.</p> |
url |
https://hess.copernicus.org/articles/25/3411/2021/hess-25-3411-2021.pdf |
work_keys_str_mv |
AT yyang lowandcontrastingimpactsofvegetationcosub2subfertilizationonglobalterrestrialrunoffover19822010accountingforabovegroundandbelowgroundvegetationcosub2subeffects AT trmcvicar lowandcontrastingimpactsofvegetationcosub2subfertilizationonglobalterrestrialrunoffover19822010accountingforabovegroundandbelowgroundvegetationcosub2subeffects AT trmcvicar lowandcontrastingimpactsofvegetationcosub2subfertilizationonglobalterrestrialrunoffover19822010accountingforabovegroundandbelowgroundvegetationcosub2subeffects AT dyang lowandcontrastingimpactsofvegetationcosub2subfertilizationonglobalterrestrialrunoffover19822010accountingforabovegroundandbelowgroundvegetationcosub2subeffects AT yzhang lowandcontrastingimpactsofvegetationcosub2subfertilizationonglobalterrestrialrunoffover19822010accountingforabovegroundandbelowgroundvegetationcosub2subeffects AT spiao lowandcontrastingimpactsofvegetationcosub2subfertilizationonglobalterrestrialrunoffover19822010accountingforabovegroundandbelowgroundvegetationcosub2subeffects AT speng lowandcontrastingimpactsofvegetationcosub2subfertilizationonglobalterrestrialrunoffover19822010accountingforabovegroundandbelowgroundvegetationcosub2subeffects AT hebeck lowandcontrastingimpactsofvegetationcosub2subfertilizationonglobalterrestrialrunoffover19822010accountingforabovegroundandbelowgroundvegetationcosub2subeffects |
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spelling |
doaj-fed23f042dfc4c729272a9b757edd4b82021-06-17T06:53:15ZengCopernicus PublicationsHydrology and Earth System Sciences1027-56061607-79382021-06-01253411342710.5194/hess-25-3411-2021Low and contrasting impacts of vegetation CO<sub>2</sub> fertilization on global terrestrial runoff over 1982–2010: accounting for aboveground and belowground vegetation–CO<sub>2</sub> effectsY. Yang0T. R. McVicar1T. R. McVicar2D. Yang3Y. Zhang4S. Piao5S. Peng6H. E. Beck7State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, ChinaCSIRO Land and Water, Black Mountain, Canberra, ACT 2601, AustraliaAustralian Research Council Centre of Excellence for Climate Extremes, The Australian National University, Canberra, AustraliaState Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, ChinaKey Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, ChinaSino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing 100871, ChinaSino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing 100871, ChinaDepartment of Civil and Environmental Engineering, Princeton University, Princeton, New Jersey, USA<p>Elevation in atmospheric carbon dioxide concentration (eCO<span class="inline-formula"><sub>2</sub></span>) affects vegetation water use, with consequent impacts on terrestrial runoff (<span class="inline-formula"><i>Q</i></span>). However, the sign and magnitude of the eCO<span class="inline-formula"><sub>2</sub></span> effect on <span class="inline-formula"><i>Q</i></span> are still contentious. This is partly due to eCO<span class="inline-formula"><sub>2</sub></span>-induced changes in vegetation water use having opposing responses at the leaf scale (i.e., water-saving effect caused by partially stomatal closure) and the canopy scale (i.e., water-consuming induced by foliage cover increase), leading to highly debated conclusions among existing studies. In addition, none of the existing studies explicitly account for eCO<span class="inline-formula"><sub>2</sub></span>-induced changes to plant rooting depth that is overwhelmingly found in experimental observations. Here we develop an analytical ecohydrological framework that includes the effects of eCO<span class="inline-formula"><sub>2</sub></span> on plant leaf, canopy density, and rooting characteristics to attribute changes in <span class="inline-formula"><i>Q</i></span> and to detect the eCO<span class="inline-formula"><sub>2</sub></span> signal on <span class="inline-formula"><i>Q</i></span> via vegetation feedbacks over 1982–2010. Globally, we detect a very small decrease of <span class="inline-formula"><i>Q</i></span> induced by eCO<span class="inline-formula"><sub>2</sub></span> during 1982–2010 (<span class="inline-formula">−</span>1.7 %). Locally, we find a small positive trend (<span class="inline-formula"><i>p</i></span> <span class="inline-formula"><i><</i></span> 0.01) in the <span class="inline-formula"><i>Q</i></span>–eCO<span class="inline-formula"><sub>2</sub></span> response along a resource availability (<span class="inline-formula"><i>β</i></span>) gradient. Specifically, the <span class="inline-formula"><i>Q</i></span>–eCO<span class="inline-formula"><sub>2</sub></span> response is found to be negative (i.e., eCO<span class="inline-formula"><sub>2</sub></span> reduces <span class="inline-formula"><i>Q</i></span>) in low-<span class="inline-formula"><i>β</i></span> regions (typically dry and/or cold) and gradually changes to a small positive response (i.e., eCO<span class="inline-formula"><sub>2</sub></span> increases <span class="inline-formula"><i>Q</i></span>) in high-<span class="inline-formula"><i>β</i></span> areas (typically warm and humid). Our findings suggest a minor role of eCO<span class="inline-formula"><sub>2</sub></span> on changes in global <span class="inline-formula"><i>Q</i></span> over 1982–2010, yet we highlight that a negative <span class="inline-formula"><i>Q</i></span>–eCO<span class="inline-formula"><sub>2</sub></span> response in semiarid and arid regions may further reduce the limited water resource there.</p>https://hess.copernicus.org/articles/25/3411/2021/hess-25-3411-2021.pdf |