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Article: Field evidences for the positive effects of aerosols on tree growth

TitleField evidences for the positive effects of aerosols on tree growth
Authors
Keywordsvapor pressure deficit
diffuse radiation
mechanistic photosynthesis model
sun/shade leaf
aerosol-meteorology interactions
aerosol loading
canopy photosynthesis
tree stem growth
Issue Date2018
Citation
Global Change Biology, 2018, v. 24, n. 10, p. 4983-4992 How to Cite?
Abstract© 2018 John Wiley & Sons Ltd Theoretical and eddy covariance studies demonstrate that aerosol-loading stimulates canopy photosynthesis, but field evidence for the aerosol effect on tree growth is limited. Here, we measured in situ daily stem growth rates of aspen trees under a wide range of aerosol-loading in China. The results showed that daily stem growth rates were positively correlated with aerosol-loading, even at exceptionally high aerosol levels. Using structural equation modeling analysis, we showed that variations in stem growth rates can be largely attributed to two environmental variables covarying with aerosol loading: diffuse fraction of radiation and vapor pressure deficit (VPD). Furthermore, we found that these two factors influence stem growth by influencing photosynthesis from different parts of canopy. Using field observations and a mechanistic photosynthesis model, we demonstrate that photosynthetic rates of both sun and shade leaves increased under high aerosol-loading conditions but for different reasons. For sun leaves, the photosynthetic increase was primarily attributed to the concurrent lower VPD; for shade leaves, the positive aerosol effect was tightly connected with increased diffuse light. Overall, our study provides the first field evidence of increased tree growth under high aerosol loading. We highlight the importance of understanding biophysical mechanisms of aerosol-meteorology interactions, and incorporating the different pathways of aerosol effects into earth system models to improve the prediction of large-scale aerosol impacts, and the associated vegetation-mediated climate feedbacks.
Persistent Identifierhttp://hdl.handle.net/10722/267109
ISSN
2023 Impact Factor: 10.8
2023 SCImago Journal Rankings: 4.285
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWang, Xin-
dc.contributor.authorWu, Jin-
dc.contributor.authorChen, Min-
dc.contributor.authorXu, Xiangtao-
dc.contributor.authorWang, Zhenhua-
dc.contributor.authorWang, Bin-
dc.contributor.authorWang, Chengzhang-
dc.contributor.authorPiao, Shilong-
dc.contributor.authorLin, Weili-
dc.contributor.authorMiao, Guofang-
dc.contributor.authorDeng, Meifeng-
dc.contributor.authorQiao, Chunlian-
dc.contributor.authorWang, Jing-
dc.contributor.authorXu, Shan-
dc.contributor.authorLiu, Lingli-
dc.date.accessioned2019-01-31T07:20:32Z-
dc.date.available2019-01-31T07:20:32Z-
dc.date.issued2018-
dc.identifier.citationGlobal Change Biology, 2018, v. 24, n. 10, p. 4983-4992-
dc.identifier.issn1354-1013-
dc.identifier.urihttp://hdl.handle.net/10722/267109-
dc.description.abstract© 2018 John Wiley & Sons Ltd Theoretical and eddy covariance studies demonstrate that aerosol-loading stimulates canopy photosynthesis, but field evidence for the aerosol effect on tree growth is limited. Here, we measured in situ daily stem growth rates of aspen trees under a wide range of aerosol-loading in China. The results showed that daily stem growth rates were positively correlated with aerosol-loading, even at exceptionally high aerosol levels. Using structural equation modeling analysis, we showed that variations in stem growth rates can be largely attributed to two environmental variables covarying with aerosol loading: diffuse fraction of radiation and vapor pressure deficit (VPD). Furthermore, we found that these two factors influence stem growth by influencing photosynthesis from different parts of canopy. Using field observations and a mechanistic photosynthesis model, we demonstrate that photosynthetic rates of both sun and shade leaves increased under high aerosol-loading conditions but for different reasons. For sun leaves, the photosynthetic increase was primarily attributed to the concurrent lower VPD; for shade leaves, the positive aerosol effect was tightly connected with increased diffuse light. Overall, our study provides the first field evidence of increased tree growth under high aerosol loading. We highlight the importance of understanding biophysical mechanisms of aerosol-meteorology interactions, and incorporating the different pathways of aerosol effects into earth system models to improve the prediction of large-scale aerosol impacts, and the associated vegetation-mediated climate feedbacks.-
dc.languageeng-
dc.relation.ispartofGlobal Change Biology-
dc.subjectvapor pressure deficit-
dc.subjectdiffuse radiation-
dc.subjectmechanistic photosynthesis model-
dc.subjectsun/shade leaf-
dc.subjectaerosol-meteorology interactions-
dc.subjectaerosol loading-
dc.subjectcanopy photosynthesis-
dc.subjecttree stem growth-
dc.titleField evidences for the positive effects of aerosols on tree growth-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/gcb.14339-
dc.identifier.pmid29855126-
dc.identifier.scopuseid_2-s2.0-85052457388-
dc.identifier.volume24-
dc.identifier.issue10-
dc.identifier.spage4983-
dc.identifier.epage4992-
dc.identifier.eissn1365-2486-
dc.identifier.isiWOS:000445728800040-
dc.identifier.issnl1354-1013-

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