globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.14339
Scopus记录号: 2-s2.0-85052457388
论文题名:
Field evidences for the positive effects of aerosols on tree growth
作者: Wang X.; Wu J.; Chen M.; Xu X.; Wang Z.; Wang B.; Wang C.; Piao S.; Lin W.; Miao G.; Deng M.; Qiao C.; Wang J.; Xu S.; Liu L.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期:10
起始页码: 4983
结束页码: 4992
语种: 英语
英文关键词: aerosol loading ; aerosol-meteorology interactions ; canopy photosynthesis ; diffuse radiation ; mechanistic photosynthesis model ; sun/shade leaf ; tree stem growth ; vapor pressure deficit
Scopus关键词: Populus
英文摘要: 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. © 2018 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110232
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Xiangshan, Beijing, China; University of Chinese Academy of Sciences, Yuquanlu, Beijing, China; Environmental & Climate Sciences Department, Brookhaven National LaboratoryNY, United States; Department of Global Ecology, Carnegie Institution for Science, Stanford, CA, United States; Joint Global Change Research Institute, Pacific Northwest National LaboratoryMD, United States; Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, United States; Department of Ecology, College of Urban and Environmental Science, Peking University, Beijing, China; College of Life and Environmental Sciences, Minzu University of China, Beijing, China; Department of Natural Resources and Environmental Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, United States

Recommended Citation:
Wang X.,Wu J.,Chen M.,et al. Field evidences for the positive effects of aerosols on tree growth[J]. Global Change Biology,2018-01-01,24(10)
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