Higher plant photosynthetic capability in autumn responding to low atmospheric vapor pressure deficit

It has been long established that the terrestrial vegetation in spring has stronger photosynthetic capability than in autumn. However, this study challenges this consensus by comparing photosynthetic capability of terrestrial vegetation between the spring and autumn seasons based on measurements of...

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Autores principales:	Yawen Wang, Wenfang Xu, Wenping Yuan, Xiuzhi Chen, Bingwei Zhang, Lei Fan, Bin He, Zhongmin Hu, Shuguang Liu, Wei Liu, Shilong Piao
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	light use efficiency vapor pressure deficit vegetation index carbon cycle Science (General) Q1-390
Acceso en línea:	https://doaj.org/article/5b8f6bd075734c5d8d0b370db0c3448e
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spelling	oai:doaj.org-article:5b8f6bd075734c5d8d0b370db0c3448e2021-11-28T04:39:02ZHigher plant photosynthetic capability in autumn responding to low atmospheric vapor pressure deficit2666-675810.1016/j.xinn.2021.100163https://doaj.org/article/5b8f6bd075734c5d8d0b370db0c3448e2021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666675821000886https://doaj.org/toc/2666-6758It has been long established that the terrestrial vegetation in spring has stronger photosynthetic capability than in autumn. However, this study challenges this consensus by comparing photosynthetic capability of terrestrial vegetation between the spring and autumn seasons based on measurements of 100 in situ eddy covariance towers over global extratropical ecosystems. At the majority of these sites, photosynthetic capability, indicated by light use efficiency (LUE) and apparent quantum efficiency, is significantly higher in autumn than in spring, due to lower atmosphere vapor pressure deficit (VPD) at the same air temperature. Seasonal VPD differences also substantially explain the interannual variability of the differences in photosynthetic capability between spring and autumn. We further reveal that VPD in autumn is significantly lower than in spring over 74.14% of extratropical areas, based on a global climate dataset. In contrast, LUE derived from a data-driven vegetation production dataset is significantly higher in autumn in over 61.02% of extratropical vegetated areas. Six Earth system models consistently projected continuous larger VPD values in spring compared with autumn, which implies that the impacts on vegetation growth will long exist and should be adequately considered when assessing the seasonal responses of terrestrial ecosystems to future climate conditions. Public summary: • Autumn VPD is lower than spring VPD at the same air temperature over majority of the extratropical vegetated land • Photosynthetic capability is significantly higher in autumn than in spring due to lower VPD • Earth System Models projected continuous larger VPD values in spring as against autumnYawen WangWenfang XuWenping YuanXiuzhi ChenBingwei ZhangLei FanBin HeZhongmin HuShuguang LiuWei LiuShilong PiaoElsevierarticlelight use efficiencyvapor pressure deficitvegetation indexcarbon cycleScience (General)Q1-390ENThe Innovation, Vol 2, Iss 4, Pp 100163- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	light use efficiency vapor pressure deficit vegetation index carbon cycle Science (General) Q1-390
spellingShingle	light use efficiency vapor pressure deficit vegetation index carbon cycle Science (General) Q1-390 Yawen Wang Wenfang Xu Wenping Yuan Xiuzhi Chen Bingwei Zhang Lei Fan Bin He Zhongmin Hu Shuguang Liu Wei Liu Shilong Piao Higher plant photosynthetic capability in autumn responding to low atmospheric vapor pressure deficit
description	It has been long established that the terrestrial vegetation in spring has stronger photosynthetic capability than in autumn. However, this study challenges this consensus by comparing photosynthetic capability of terrestrial vegetation between the spring and autumn seasons based on measurements of 100 in situ eddy covariance towers over global extratropical ecosystems. At the majority of these sites, photosynthetic capability, indicated by light use efficiency (LUE) and apparent quantum efficiency, is significantly higher in autumn than in spring, due to lower atmosphere vapor pressure deficit (VPD) at the same air temperature. Seasonal VPD differences also substantially explain the interannual variability of the differences in photosynthetic capability between spring and autumn. We further reveal that VPD in autumn is significantly lower than in spring over 74.14% of extratropical areas, based on a global climate dataset. In contrast, LUE derived from a data-driven vegetation production dataset is significantly higher in autumn in over 61.02% of extratropical vegetated areas. Six Earth system models consistently projected continuous larger VPD values in spring compared with autumn, which implies that the impacts on vegetation growth will long exist and should be adequately considered when assessing the seasonal responses of terrestrial ecosystems to future climate conditions. Public summary: • Autumn VPD is lower than spring VPD at the same air temperature over majority of the extratropical vegetated land • Photosynthetic capability is significantly higher in autumn than in spring due to lower VPD • Earth System Models projected continuous larger VPD values in spring as against autumn
format	article
author	Yawen Wang Wenfang Xu Wenping Yuan Xiuzhi Chen Bingwei Zhang Lei Fan Bin He Zhongmin Hu Shuguang Liu Wei Liu Shilong Piao
author_facet	Yawen Wang Wenfang Xu Wenping Yuan Xiuzhi Chen Bingwei Zhang Lei Fan Bin He Zhongmin Hu Shuguang Liu Wei Liu Shilong Piao
author_sort	Yawen Wang
title	Higher plant photosynthetic capability in autumn responding to low atmospheric vapor pressure deficit
title_short	Higher plant photosynthetic capability in autumn responding to low atmospheric vapor pressure deficit
title_full	Higher plant photosynthetic capability in autumn responding to low atmospheric vapor pressure deficit
title_fullStr	Higher plant photosynthetic capability in autumn responding to low atmospheric vapor pressure deficit
title_full_unstemmed	Higher plant photosynthetic capability in autumn responding to low atmospheric vapor pressure deficit
title_sort	higher plant photosynthetic capability in autumn responding to low atmospheric vapor pressure deficit
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/5b8f6bd075734c5d8d0b370db0c3448e
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Higher plant photosynthetic capability in autumn responding to low atmospheric vapor pressure deficit

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