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231224s2016 xx |||||o 00| ||eng c |
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|a 10.1111/gcb.13300
|2 doi
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|a eng
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|a Yue, Xu
|e verfasserin
|4 aut
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|a Limited effect of ozone reductions on the 20-year photosynthesis trend at Harvard forest
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|c 2016
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 14.09.2017
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|a Date Revised 10.12.2019
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2016 John Wiley & Sons Ltd.
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|a Ozone (O3 ) damage to leaves can reduce plant photosynthesis, which suggests that declines in ambient O3 concentrations ([O3 ]) in the United States may have helped increase gross primary production (GPP) in recent decades. Here, we assess the effect of long-term changes in ambient [O3 ] using 20 years of observations at Harvard forest. Using artificial neural networks, we found that the effect of the inclusion of [O3 ] as a predictor was slight, and independent of O3 concentrations, which suggests limited high-frequency O3 inhibition of GPP at this site. Simulations with a terrestrial biosphere model, however, suggest an average long-term O3 inhibition of 10.4% for 1992-2011. A decline of [O3 ] over the measurement period resulted in moderate predicted GPP trends of 0.02-0.04 μmol C m-2 s-1 yr-1 , which is negligible relative to the total observed GPP trend of 0.41 μmol C m-2 s-1 yr-1 . A similar conclusion is achieved with the widely used AOT40 metric. Combined, our results suggest that ozone reductions at Harvard forest are unlikely to have had a large impact on the photosynthesis trend over the past 20 years. Such limited effects are mainly related to the slow responses of photosynthesis to changes in [O3 ]. Furthermore, we estimate that 40% of photosynthesis happens in the shade, where stomatal conductance and thus [O3 ] deposition is lower than for sunlit leaves. This portion of GPP remains unaffected by [O3 ], thus helping to buffer the changes of total photosynthesis due to varied [O3 ]. Our analyses suggest that current ozone reductions, although significant, cannot substantially alleviate the damages to forest ecosystems
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|a Journal Article
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|a artificial neural networks
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|a decadal trend
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|a deciduous forest
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|a gross primary production
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|a ozone inhibition
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|a photosynthesis
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|a stomatal conductance
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|a terrestrial biosphere model
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| 650 |
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|a Ozone
|2 NLM
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| 650 |
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|a 66H7ZZK23N
|2 NLM
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| 700 |
1 |
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|a Keenan, Trevor F
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Munger, William
|e verfasserin
|4 aut
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| 700 |
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|a Unger, Nadine
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Global change biology
|d 1999
|g 22(2016), 11 vom: 19. Nov., Seite 3750-3759
|w (DE-627)NLM098239996
|x 1365-2486
|7 nnns
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| 773 |
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|g volume:22
|g year:2016
|g number:11
|g day:19
|g month:11
|g pages:3750-3759
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|u http://dx.doi.org/10.1111/gcb.13300
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