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Title: Experimental warming amplified opposite impacts of drought vs. wet extremes on ecosystem carbon cycle in a tallgrass prairie

Abstract

Climate warming is leading to greater precipitation variability, resulting in increased frequency and intensity of both drought and wet extremes. However, how these extreme events interact with climate warming and hay-harvest in grasslands to impact ecosystem functions has not yet been well explored. In this study, we took advantage of a long-term experiment to examine how climate warming and clipping (i.e., mimicking hay harvest) regulated impacts of naturally occurring drought and wet extremes on ecosystem CO 2 fluxes of a tallgrass prairie in the Great Plains, USA. Warming resulted in net ecosystem carbon release (i.e., positive net ecosystem CO 2 exchange, NEE) in the extreme drought year of 2011, but significantly enhanced net carbon uptake in the extremely wet year of 2015 in comparison with NEE in normal years. Warming-induced carbon release in the drought year was due to significantly enhanced ecosystem respiration (ER) from mid-summer to early-autumn, whereas warming-enhanced NEE in the wet year was due to an increase in aboveground net primary production (ANPP) compared to those in normal years. Drought diminished warming-induced increases in ANPP to about one sixth of that in the wet year in the unclipped plots. Interestingly, clipping offset the drought-mediated ecosystem carbon lossmore » by increasing GPP and weakened the wet-enhanced ANPP. Altogether, our results suggest that a future, warmer climate may exacerbate carbon losses in terrestrial ecosystems during drought extremes but stimulate the ecosystem carbon sink under wet extremes.« less

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [5]; ORCiD logo [5];  [1];  [6]
  1. Northern Arizona Univ., Flagstaff, AZ (United States)
  2. Nanjing Forestry Univ., Jiangsu (China)
  3. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Univ. of Oklahoma, Norman, OK (United States)
  6. Northern Arizona Univ., Flagstaff, AZ (United States); Tsinghua Univ., Beijing (China)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1558472
Alternate Identifier(s):
OSTI ID: 1529645
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Agricultural and Forest Meteorology
Additional Journal Information:
Journal Volume: 276-277; Journal Issue: C; Journal ID: ISSN 0168-1923
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Climate warming; Drought; Ecosystem carbon cycle; Grasslands; Long-term experiment; Extreme precipitation

Citation Formats

Jung, Chang Gyo, Xu, Xia, Niu, Shuli, Liang, Junyi, Chen, Xuecheng, Shi, Zheng, Jiang, Lifen, and Luo, Yiqi. Experimental warming amplified opposite impacts of drought vs. wet extremes on ecosystem carbon cycle in a tallgrass prairie. United States: N. p., 2019. Web. doi:10.1016/j.agrformet.2019.107635.
Jung, Chang Gyo, Xu, Xia, Niu, Shuli, Liang, Junyi, Chen, Xuecheng, Shi, Zheng, Jiang, Lifen, & Luo, Yiqi. Experimental warming amplified opposite impacts of drought vs. wet extremes on ecosystem carbon cycle in a tallgrass prairie. United States. doi:10.1016/j.agrformet.2019.107635.
Jung, Chang Gyo, Xu, Xia, Niu, Shuli, Liang, Junyi, Chen, Xuecheng, Shi, Zheng, Jiang, Lifen, and Luo, Yiqi. Wed . "Experimental warming amplified opposite impacts of drought vs. wet extremes on ecosystem carbon cycle in a tallgrass prairie". United States. doi:10.1016/j.agrformet.2019.107635. https://www.osti.gov/servlets/purl/1558472.
@article{osti_1558472,
title = {Experimental warming amplified opposite impacts of drought vs. wet extremes on ecosystem carbon cycle in a tallgrass prairie},
author = {Jung, Chang Gyo and Xu, Xia and Niu, Shuli and Liang, Junyi and Chen, Xuecheng and Shi, Zheng and Jiang, Lifen and Luo, Yiqi},
abstractNote = {Climate warming is leading to greater precipitation variability, resulting in increased frequency and intensity of both drought and wet extremes. However, how these extreme events interact with climate warming and hay-harvest in grasslands to impact ecosystem functions has not yet been well explored. In this study, we took advantage of a long-term experiment to examine how climate warming and clipping (i.e., mimicking hay harvest) regulated impacts of naturally occurring drought and wet extremes on ecosystem CO2 fluxes of a tallgrass prairie in the Great Plains, USA. Warming resulted in net ecosystem carbon release (i.e., positive net ecosystem CO2 exchange, NEE) in the extreme drought year of 2011, but significantly enhanced net carbon uptake in the extremely wet year of 2015 in comparison with NEE in normal years. Warming-induced carbon release in the drought year was due to significantly enhanced ecosystem respiration (ER) from mid-summer to early-autumn, whereas warming-enhanced NEE in the wet year was due to an increase in aboveground net primary production (ANPP) compared to those in normal years. Drought diminished warming-induced increases in ANPP to about one sixth of that in the wet year in the unclipped plots. Interestingly, clipping offset the drought-mediated ecosystem carbon loss by increasing GPP and weakened the wet-enhanced ANPP. Altogether, our results suggest that a future, warmer climate may exacerbate carbon losses in terrestrial ecosystems during drought extremes but stimulate the ecosystem carbon sink under wet extremes.},
doi = {10.1016/j.agrformet.2019.107635},
journal = {Agricultural and Forest Meteorology},
issn = {0168-1923},
number = C,
volume = 276-277,
place = {United States},
year = {2019},
month = {6}
}

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