Field evidences for the positive effects of aerosols on tree growth

Field evidences for the positive effects of aerosols on tree growth

© 2018 John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 24(2018), 10 vom: 31. Okt., Seite 4983-4992
1. Verfasser: Wang, Xin (VerfasserIn)
Weitere Verfasser: Wu, Jin, Chen, Min, Xu, Xiangtao, Wang, Zhenhua, Wang, Bin, Wang, Chengzhang, Piao, Shilong, Lin, Weili, Miao, Guofang, Deng, Meifeng, Qiao, Chunlian, Wang, Jing, Xu, Shan, Liu, Lingli
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2018
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. aerosol loading aerosol-meteorology interactions canopy photosynthesis diffuse radiation mechanistic photosynthesis model sun/shade leaf tree stem growth mehr... vapor pressure deficit Aerosols
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520 |a 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 
650 4 |a Journal Article 
650 4 |a Research Support, Non-U.S. Gov't 
650 4 |a Research Support, U.S. Gov't, Non-P.H.S. 
650 4 |a aerosol loading 
650 4 |a aerosol-meteorology interactions 
650 4 |a canopy photosynthesis 
650 4 |a diffuse radiation 
650 4 |a mechanistic photosynthesis model 
650 4 |a sun/shade leaf 
650 4 |a tree stem growth 
650 4 |a vapor pressure deficit 
650 7 |a Aerosols  |2 NLM 
700 1 |a Wu, Jin  |e verfasserin  |4 aut 
700 1 |a Chen, Min  |e verfasserin  |4 aut 
700 1 |a Xu, Xiangtao  |e verfasserin  |4 aut 
700 1 |a Wang, Zhenhua  |e verfasserin  |4 aut 
700 1 |a Wang, Bin  |e verfasserin  |4 aut 
700 1 |a Wang, Chengzhang  |e verfasserin  |4 aut 
700 1 |a Piao, Shilong  |e verfasserin  |4 aut 
700 1 |a Lin, Weili  |e verfasserin  |4 aut 
700 1 |a Miao, Guofang  |e verfasserin  |4 aut 
700 1 |a Deng, Meifeng  |e verfasserin  |4 aut 
700 1 |a Qiao, Chunlian  |e verfasserin  |4 aut 
700 1 |a Wang, Jing  |e verfasserin  |4 aut 
700 1 |a Xu, Shan  |e verfasserin  |4 aut 
700 1 |a Liu, Lingli  |e verfasserin  |4 aut 
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