Plant stomatal conductance determined transpiration and photosynthesis both contribute to the enhanced negative air ion (NAI)

Negative air ion (NAI) has been widely recognized to be regulated by plant photosynthesis. However, their quantified relationship had seldom been validated. In this study, plant photosynthesis-related traits (including leaf area-specific photosynthesis An, transpiration rates El, stomatal conductanc...

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Autores principales:	Zhenzhen Zhang, Sichen Tao, Benzhi Zhou, Xiaoyan Zhang, Zhen Zhao
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Negative air ion (NAI) Sap flow Photosynthesis Stomatal conductance Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/cad3c9805aab4953857069f0cc8b3bb9
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spelling	oai:doaj.org-article:cad3c9805aab4953857069f0cc8b3bb92021-12-01T04:59:24ZPlant stomatal conductance determined transpiration and photosynthesis both contribute to the enhanced negative air ion (NAI)1470-160X10.1016/j.ecolind.2021.108114https://doaj.org/article/cad3c9805aab4953857069f0cc8b3bb92021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21007792https://doaj.org/toc/1470-160XNegative air ion (NAI) has been widely recognized to be regulated by plant photosynthesis. However, their quantified relationship had seldom been validated. In this study, plant photosynthesis-related traits (including leaf area-specific photosynthesis An, transpiration rates El, stomatal conductance gs, photosynthetic electron transport rate ETR) and leaf area-specific NAI (NAIc) were measured to qualify their relations with ten different species in a thermostat. Sap flow measurement was conducted on 15 individuals of Camellia japonica L. in an open-top chamber (OTC) to inverse sap flow based-stomatal conductance (GSf), as a proxy of whole individual photosynthesis. We also conducted gas exchange measurements on these individuals and compared them with their GSf. Three micro-meteorological parameters, including air temperature (Ta), relative humidity (RH) and radiation (Ra) and NAI were synchronously monitored with sap flow measurement. Significant differences were observed in NAIc among the 10 species, and was highly determined by their An, El and gs. However, since RH in the thermostat was stable at 70%, we could concluded that the NAIc difference among species was determined by the gs-related photosynthesis, rather than the El- related transpiration. In the OTC experiment, before the C. japonica individuals were moved in, Ta, RH and Ra accounted for 89% of the total NAI variation. However, after the C. japonica were moved in, the contribution of the three parameters decreased to 40%, and the new model only provided 46% of NAI variation. Since gs and An of C. japonica individuals were well explained by the GSf (R2 = 0.94 and 0.91 respectively), which proved GSf a good proxy of gs and An. GSf during the daytime was then considered in the model, and 76.88% of NAI variances were accounted. Even though some limitations such as the disturbance of air quantity index (AQI) still exist in our study, we provided a more efficient way to inverse the NAI dynamics in the region of vegetation.Zhenzhen ZhangSichen TaoBenzhi ZhouXiaoyan ZhangZhen ZhaoElsevierarticleNegative air ion (NAI)Sap flowPhotosynthesisStomatal conductanceEcologyQH540-549.5ENEcological Indicators, Vol 130, Iss , Pp 108114- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Negative air ion (NAI) Sap flow Photosynthesis Stomatal conductance Ecology QH540-549.5
spellingShingle	Negative air ion (NAI) Sap flow Photosynthesis Stomatal conductance Ecology QH540-549.5 Zhenzhen Zhang Sichen Tao Benzhi Zhou Xiaoyan Zhang Zhen Zhao Plant stomatal conductance determined transpiration and photosynthesis both contribute to the enhanced negative air ion (NAI)
description	Negative air ion (NAI) has been widely recognized to be regulated by plant photosynthesis. However, their quantified relationship had seldom been validated. In this study, plant photosynthesis-related traits (including leaf area-specific photosynthesis An, transpiration rates El, stomatal conductance gs, photosynthetic electron transport rate ETR) and leaf area-specific NAI (NAIc) were measured to qualify their relations with ten different species in a thermostat. Sap flow measurement was conducted on 15 individuals of Camellia japonica L. in an open-top chamber (OTC) to inverse sap flow based-stomatal conductance (GSf), as a proxy of whole individual photosynthesis. We also conducted gas exchange measurements on these individuals and compared them with their GSf. Three micro-meteorological parameters, including air temperature (Ta), relative humidity (RH) and radiation (Ra) and NAI were synchronously monitored with sap flow measurement. Significant differences were observed in NAIc among the 10 species, and was highly determined by their An, El and gs. However, since RH in the thermostat was stable at 70%, we could concluded that the NAIc difference among species was determined by the gs-related photosynthesis, rather than the El- related transpiration. In the OTC experiment, before the C. japonica individuals were moved in, Ta, RH and Ra accounted for 89% of the total NAI variation. However, after the C. japonica were moved in, the contribution of the three parameters decreased to 40%, and the new model only provided 46% of NAI variation. Since gs and An of C. japonica individuals were well explained by the GSf (R2 = 0.94 and 0.91 respectively), which proved GSf a good proxy of gs and An. GSf during the daytime was then considered in the model, and 76.88% of NAI variances were accounted. Even though some limitations such as the disturbance of air quantity index (AQI) still exist in our study, we provided a more efficient way to inverse the NAI dynamics in the region of vegetation.
format	article
author	Zhenzhen Zhang Sichen Tao Benzhi Zhou Xiaoyan Zhang Zhen Zhao
author_facet	Zhenzhen Zhang Sichen Tao Benzhi Zhou Xiaoyan Zhang Zhen Zhao
author_sort	Zhenzhen Zhang
title	Plant stomatal conductance determined transpiration and photosynthesis both contribute to the enhanced negative air ion (NAI)
title_short	Plant stomatal conductance determined transpiration and photosynthesis both contribute to the enhanced negative air ion (NAI)
title_full	Plant stomatal conductance determined transpiration and photosynthesis both contribute to the enhanced negative air ion (NAI)
title_fullStr	Plant stomatal conductance determined transpiration and photosynthesis both contribute to the enhanced negative air ion (NAI)
title_full_unstemmed	Plant stomatal conductance determined transpiration and photosynthesis both contribute to the enhanced negative air ion (NAI)
title_sort	plant stomatal conductance determined transpiration and photosynthesis both contribute to the enhanced negative air ion (nai)
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/cad3c9805aab4953857069f0cc8b3bb9
work_keys_str_mv	AT zhenzhenzhang plantstomatalconductancedeterminedtranspirationandphotosynthesisbothcontributetotheenhancednegativeairionnai AT sichentao plantstomatalconductancedeterminedtranspirationandphotosynthesisbothcontributetotheenhancednegativeairionnai AT benzhizhou plantstomatalconductancedeterminedtranspirationandphotosynthesisbothcontributetotheenhancednegativeairionnai AT xiaoyanzhang plantstomatalconductancedeterminedtranspirationandphotosynthesisbothcontributetotheenhancednegativeairionnai AT zhenzhao plantstomatalconductancedeterminedtranspirationandphotosynthesisbothcontributetotheenhancednegativeairionnai
_version_	1718405628025634816

Plant stomatal conductance determined transpiration and photosynthesis both contribute to the enhanced negative air ion (NAI)

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