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Extreme Spring Drought and Extreme Summer Precipitation Weakened the Carbon Sink Strength in an Estuarine Wetland

文献类型：期刊论文

作者Wei, Siyu4,5,6; Wu, Wenhe3,5,6; Chu, Xiaojing2,5,6; Zhang, Xiaoshuai2,5,6; Zhao, Mingliang2,5,6; Wang, Xiaojie2,5,6; Li, Peiguang2,5,6; Song, Weimin2,4,5,6; Lu, Feng1; Cui, Buli3
刊名JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
出版日期2026-03-02
卷号131期号:3页码:15
关键词climate change extreme hydrological event estuarine wetland net ecosystem CO2 exchange eddy covariance
ISSN号2169-8953
DOI10.1029/2025JG009583
通讯作者Han, Guangxuan(gxhan@yic.ac.cn)
英文摘要Ongoing climate change is expected to increase the frequency and intensity of extreme hydrological events globally. Since the carbon sink function of wetlands is largely driven by hydrology, it is essential to comprehensively understand how these extreme events impact wetland carbon processes. However, the response of the wetland carbon cycle to extreme hydrological events under a changing climate remains uncertain. In this study, we employed the eddy covariance technique to evaluate the impact of extreme hydrological events on the carbon sink strength in an estuarine wetland in the Yellow River Delta. We selected 2 years, 2019 and 2020, with comparable annual rainfall totals but notable differences in seasonal precipitation patterns: the year 2019 was characterized by an extremely dry spring and an extreme precipitation event in summer. The results revealed a 60% decline in annual CO2 uptake, with net ecosystem CO2 exchange (NEE) recorded at -105 g C m(-2) yr(-1) in 2019, compared to -261 g C m(-2) yr(-1) in 2020. Both the extreme drought in spring and the extreme precipitation in summer reduced the maximum rates of photosynthesis throughout the growing season. Finally, a comparison with historical monitoring data from 2011 to 2020 at the study site revealed that the annual CO2 sink magnitude in 2019 decreased by 54% compared to the multi-year average NEE of -228 +/- 58 g C m(-2) yr(-1). This study provides a novel perspective on how extreme hydrological events influence the carbon budget of wetlands. Plain Language Summary Climate change is expected to increase the frequency and intensity of extreme hydrological events, such as droughts and heavy rainfall. These events could significantly disrupt the carbon cycle in wetlands. Wetland ecosystems are vital carbon sinks, with a remarkable ability to sequester and store carbon in soil and biomass. Their capacity to reduce atmospheric CO2 makes them crucial for mitigating global climate change. However, the changing patterns of extreme wet and dry conditions make it more difficult to predict how wetlands will store or release carbon in the future. In this study, we investigated the impact of two types of extreme hydrological events-spring drought and summer rainfall-on a wetland's carbon storage. We compared 2 years, 2019 and 2020, which received similar total rainfall but had very different seasonal hydrological conditions. In 2019, the spring was extremely dry, followed by an extreme rainfall event in the summer. Our findings revealed that the wetland absorbed 60% less carbon in 2019 compared to 2020. Both the dry spring and the wet summer reduced the wetland's ability to photosynthesize during the growing season. This study emphasizes the need to better understand how extreme hydrological events affect the carbon sink strength of wetlands.
WOS关键词NET ECOSYSTEM EXCHANGE ; CLIMATE EXTREMES ; IMPACTS ; RESPIRATION ; CYCLE
WOS研究方向Environmental Sciences & Ecology ; Geology
语种英语
WOS记录号WOS:001704637900001
资助机构Opening Fund of Yellow River Delta Field Observation and Research Station of Coastal Wetland Ecosystem, Chinese Academy of Sciences ; Natural Science Foundation of China ; International Science Partnership Program of the Chinese Academy of Sciences ; National Key Research and Development Program of China
源URL[http://ir.yic.ac.cn/handle/133337/42210]  
专题烟台海岸带研究所_中科院海岸带环境过程与生态修复重点实验室
通讯作者Han, Guangxuan
作者单位1.Adm Bur Yellow River Delta Natl Nat Reserve, Dongying, Peoples R China
2.Shandong Key Lab Coastal Environm Proc, Yantai, Peoples R China
3.Ludong Univ, Sch Resources & Environm Engn, Yantai, Peoples R China
4.Univ Chinese Acad Sci, Beijing, Peoples R China
5.Chinese Acad Sci, Yellow River Delta Field Observat & Res Stn Coasta, Dongying, Peoples R China
6.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Zone Environm Proc & Ecol Remediat, Yantai, Peoples R China
推荐引用方式
GB/T 7714		 Wei, Siyu,Wu, Wenhe,Chu, Xiaojing,et al. Extreme Spring Drought and Extreme Summer Precipitation Weakened the Carbon Sink Strength in an Estuarine Wetland[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2026,131(3):15.
APA Wei, Siyu.,Wu, Wenhe.,Chu, Xiaojing.,Zhang, Xiaoshuai.,Zhao, Mingliang.,...&Han, Guangxuan.(2026).Extreme Spring Drought and Extreme Summer Precipitation Weakened the Carbon Sink Strength in an Estuarine Wetland.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,131(3),15.
MLA Wei, Siyu,et al."Extreme Spring Drought and Extreme Summer Precipitation Weakened the Carbon Sink Strength in an Estuarine Wetland".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 131.3(2026):15.

入库方式： OAI收割

来源：烟台海岸带研究所

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