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Title: Severe summer heatwave and drought strongly reduced carbon uptake in Southern China

Increasing heatwave and drought events can potentially alter the carbon cycle. Few studies have investigated the impacts of hundred-year return heatwaves and droughts, as those events are rare. In the summer of 2013, southern China experienced its strongest drought and heatwave on record for the past 113 years. We show that the record-breaking heatwave and drought lasted two months (from July to August), significantly reduced the satellite-based vegetation index and gross primary production, substantially altered the regional carbon cycle, and produced the largest negative crop yield anomaly since 1960. The event resulted in a net reduction of 101.54 Tg C in carbon sequestration in the region during these two months, which was 39–53% of the annual net carbon sink of China’s terrestrial ecosystems (190–260 Tg C yr -1). Moreover, model experiments showed that heatwaves and droughts consistently decreased ecosystem vegetation primary production but had opposite impacts on ecosystem respiration (TER), with increased TER by 6.78 ± 2.15% and decreased TER by 15.34 ± 3.57% assuming only changed temperature and precipitation, respectively. As a result, in light of increasing frequency and severity of future heatwaves and droughts, our study highlights the importance of accounting for the impacts of heatwaves and droughtsmore » in assessing the carbon sequestration in terrestrial ecosystems.« less
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [2] ;  [2] ;  [4] ;  [2] ;  [4] ;  [5] ;  [2] ;  [2] ;  [3] ;  [4] ;  [3] ;  [6]
  1. Beijing Normal Univ., Beijing (China); Chinese Academy of Sciences (CAS), Gansu (China)
  2. Beijing Normal Univ., Beijing (China)
  3. Central South Univ. of Forestry and Technology, Hunan (China)
  4. Chinese Academy of Sciences (CAS), Beijing (China)
  5. Nanjing Univ. (China)
  6. Zhejiang Agriculture and Forestry Univ., Lin'an (China)
Publication Date:
Grant/Contract Number:
FG02-04ER63917
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Oregon State Univ., Corvallis, OR (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
Language:
English
Subject:
biogeochemistry
OSTI Identifier:
1239118

Yuan, Wenping, Cai, Wenwen, Chen, Yang, Liu, Shuguang, Dong, Wenjie, Zhang, Haicheng, Yu, Guirui, Chen, Zhuoqi, He, Honglin, Guo, Weidong, Liu, Dan, Liu, Shaoming, Xiang, Wenhua, Xie, Zhenghui, Zhao, Zhonghui, and Zhou, Guomo. Severe summer heatwave and drought strongly reduced carbon uptake in Southern China. United States: N. p., Web. doi:10.1038/srep18813.
Yuan, Wenping, Cai, Wenwen, Chen, Yang, Liu, Shuguang, Dong, Wenjie, Zhang, Haicheng, Yu, Guirui, Chen, Zhuoqi, He, Honglin, Guo, Weidong, Liu, Dan, Liu, Shaoming, Xiang, Wenhua, Xie, Zhenghui, Zhao, Zhonghui, & Zhou, Guomo. Severe summer heatwave and drought strongly reduced carbon uptake in Southern China. United States. doi:10.1038/srep18813.
Yuan, Wenping, Cai, Wenwen, Chen, Yang, Liu, Shuguang, Dong, Wenjie, Zhang, Haicheng, Yu, Guirui, Chen, Zhuoqi, He, Honglin, Guo, Weidong, Liu, Dan, Liu, Shaoming, Xiang, Wenhua, Xie, Zhenghui, Zhao, Zhonghui, and Zhou, Guomo. 2016. "Severe summer heatwave and drought strongly reduced carbon uptake in Southern China". United States. doi:10.1038/srep18813. https://www.osti.gov/servlets/purl/1239118.
@article{osti_1239118,
title = {Severe summer heatwave and drought strongly reduced carbon uptake in Southern China},
author = {Yuan, Wenping and Cai, Wenwen and Chen, Yang and Liu, Shuguang and Dong, Wenjie and Zhang, Haicheng and Yu, Guirui and Chen, Zhuoqi and He, Honglin and Guo, Weidong and Liu, Dan and Liu, Shaoming and Xiang, Wenhua and Xie, Zhenghui and Zhao, Zhonghui and Zhou, Guomo},
abstractNote = {Increasing heatwave and drought events can potentially alter the carbon cycle. Few studies have investigated the impacts of hundred-year return heatwaves and droughts, as those events are rare. In the summer of 2013, southern China experienced its strongest drought and heatwave on record for the past 113 years. We show that the record-breaking heatwave and drought lasted two months (from July to August), significantly reduced the satellite-based vegetation index and gross primary production, substantially altered the regional carbon cycle, and produced the largest negative crop yield anomaly since 1960. The event resulted in a net reduction of 101.54 Tg C in carbon sequestration in the region during these two months, which was 39–53% of the annual net carbon sink of China’s terrestrial ecosystems (190–260 Tg C yr-1). Moreover, model experiments showed that heatwaves and droughts consistently decreased ecosystem vegetation primary production but had opposite impacts on ecosystem respiration (TER), with increased TER by 6.78 ± 2.15% and decreased TER by 15.34 ± 3.57% assuming only changed temperature and precipitation, respectively. As a result, in light of increasing frequency and severity of future heatwaves and droughts, our study highlights the importance of accounting for the impacts of heatwaves and droughts in assessing the carbon sequestration in terrestrial ecosystems.},
doi = {10.1038/srep18813},
journal = {Scientific Reports},
number = ,
volume = 6,
place = {United States},
year = {2016},
month = {1}
}