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Title: Surprising lack of sensitivity of biochemical limitation of photosynthesis of nine tree species to open‐air experimental warming and reduced rainfall in a southern boreal forest

Abstract

Abstract Photosynthetic biochemical limitation parameters (i.e., V cmax , J max and J max : V cmax ratio) are sensitive to temperature and water availability, but whether these parameters in cold climate species at biome ecotones are positively or negatively influenced by projected changes in global temperature and water availability remains uncertain. Prior exploration of this question has largely involved greenhouse based short‐term manipulative studies with mixed results in terms of direction and magnitude of responses. To address this question in a more realistic context, we examined the effects of increased temperature and rainfall reduction on the biochemical limitations of photosynthesis using a long‐term chamber‐less manipulative experiment located in northern Minnesota, USA. Nine tree species from the boreal‐temperate ecotone were grown in natural neighborhoods under ambient and elevated (+3.4°C) growing season temperatures and ambient or reduced (≈40% of rainfall removed) summer rainfall. Apparent rubisco carboxylation and RuBP regeneration standardized to 25°C ( V cmax25°C and J max25°C , respectively) were estimated based on A C i curves measured in situ over three growing seasons. Our primary objective was to test whether species would downregulate V cmax25°C and J max25°C in response to warming and reduced rainfall, with such responses expectedmore » to be greatest in species with the coldest and most humid native ranges, respectively. These hypotheses were not supported, as there were no overall main treatment effects on V cmax25°C or J max25°C ( p  > .14). However, J max : V cmax ratio decreased significantly with warming ( p  = .0178), whereas interactions between warming and rainfall reduction on the J max25°C to V cmax25°C ratio were not significant. The insensitivity of photosynthetic parameters to warming contrasts with many prior studies done under larger temperature differentials and often fixed daytime temperatures. In sum, plants growing in relatively realistic conditions under naturally varying temperatures and soil moisture levels were remarkably insensitive in terms of their J max25°C and V cmax25°C when grown at elevated temperatures, reduced rainfall, or both combined.« less

Authors:
ORCiD logo [1];  [1];  [2];  [1];  [3]
  1. Department of Forest Resources University of Minnesota St. Paul MN USA
  2. Department of Biology, Behavioral Neuroscience, and Health Sciences Rider University Lawrenceville NJ USA
  3. Department of Forest Resources University of Minnesota St. Paul MN USA, Hawkesbury Institute for the Environment Western Sydney University Penrith NSW Australia
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1562576
Grant/Contract Number:  
DE‐FG02‐07ER64456
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Global Change Biology
Additional Journal Information:
Journal Name: Global Change Biology Journal Volume: 26 Journal Issue: 2; Journal ID: ISSN 1354-1013
Publisher:
Wiley-Blackwell
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Stefanski, Artur, Bermudez, Raimundo, Sendall, Kerrie M., Montgomery, Rebecca A., and Reich, Peter B. Surprising lack of sensitivity of biochemical limitation of photosynthesis of nine tree species to open‐air experimental warming and reduced rainfall in a southern boreal forest. United Kingdom: N. p., 2019. Web. doi:10.1111/gcb.14805.
Stefanski, Artur, Bermudez, Raimundo, Sendall, Kerrie M., Montgomery, Rebecca A., & Reich, Peter B. Surprising lack of sensitivity of biochemical limitation of photosynthesis of nine tree species to open‐air experimental warming and reduced rainfall in a southern boreal forest. United Kingdom. https://doi.org/10.1111/gcb.14805
Stefanski, Artur, Bermudez, Raimundo, Sendall, Kerrie M., Montgomery, Rebecca A., and Reich, Peter B. Wed . "Surprising lack of sensitivity of biochemical limitation of photosynthesis of nine tree species to open‐air experimental warming and reduced rainfall in a southern boreal forest". United Kingdom. https://doi.org/10.1111/gcb.14805.
@article{osti_1562576,
title = {Surprising lack of sensitivity of biochemical limitation of photosynthesis of nine tree species to open‐air experimental warming and reduced rainfall in a southern boreal forest},
author = {Stefanski, Artur and Bermudez, Raimundo and Sendall, Kerrie M. and Montgomery, Rebecca A. and Reich, Peter B.},
abstractNote = {Abstract Photosynthetic biochemical limitation parameters (i.e., V cmax , J max and J max : V cmax ratio) are sensitive to temperature and water availability, but whether these parameters in cold climate species at biome ecotones are positively or negatively influenced by projected changes in global temperature and water availability remains uncertain. Prior exploration of this question has largely involved greenhouse based short‐term manipulative studies with mixed results in terms of direction and magnitude of responses. To address this question in a more realistic context, we examined the effects of increased temperature and rainfall reduction on the biochemical limitations of photosynthesis using a long‐term chamber‐less manipulative experiment located in northern Minnesota, USA. Nine tree species from the boreal‐temperate ecotone were grown in natural neighborhoods under ambient and elevated (+3.4°C) growing season temperatures and ambient or reduced (≈40% of rainfall removed) summer rainfall. Apparent rubisco carboxylation and RuBP regeneration standardized to 25°C ( V cmax25°C and J max25°C , respectively) were estimated based on A C i curves measured in situ over three growing seasons. Our primary objective was to test whether species would downregulate V cmax25°C and J max25°C in response to warming and reduced rainfall, with such responses expected to be greatest in species with the coldest and most humid native ranges, respectively. These hypotheses were not supported, as there were no overall main treatment effects on V cmax25°C or J max25°C ( p  > .14). However, J max : V cmax ratio decreased significantly with warming ( p  = .0178), whereas interactions between warming and rainfall reduction on the J max25°C to V cmax25°C ratio were not significant. The insensitivity of photosynthetic parameters to warming contrasts with many prior studies done under larger temperature differentials and often fixed daytime temperatures. In sum, plants growing in relatively realistic conditions under naturally varying temperatures and soil moisture levels were remarkably insensitive in terms of their J max25°C and V cmax25°C when grown at elevated temperatures, reduced rainfall, or both combined.},
doi = {10.1111/gcb.14805},
journal = {Global Change Biology},
number = 2,
volume = 26,
place = {United Kingdom},
year = {Wed Sep 18 00:00:00 EDT 2019},
month = {Wed Sep 18 00:00:00 EDT 2019}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1111/gcb.14805

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Cited by: 22 works
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