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Seasonal flooding amplifies the positive asymmetric response of ecosystem carbon exchange along the precipitation gradient in saline wetlands

文献类型：期刊论文

作者Li, Xinge1,2,4; Zhu, Wenbo4; Zhu, Lianqi4; Song, Weimin1,2,3; Li, Peiguang1,2,3; Wang, Xiaojie1,2,3; Han, Guangxuan1,2,3
刊名CATENA
出版日期2026-04-01
卷号265页码:10
关键词Altered precipitation Seasonal flooding Asymmetric response Ecosystem carbon flux Saline wetland
ISSN号0341-8162
DOI10.1016/j.catena.2026.109865
通讯作者Han, Guangxuan(gxhan@yic.ac.cn)
英文摘要Intensified precipitation variability profoundly affects saline wetland hydrological dynamics, potentially interfering with key carbon processes within ecosystems. However, the mechanisms underlying how precipitation changes affect ecosystems carbon processes in saline wetland remain unclear. Moreover, whether seasonal flooding influences wetland ecosystems' carbon processes response to precipitation changes is still poorly understood. Based on a six-year field precipitation experiment including five precipitation levels (-60%, -40%, +0%, +40%, and + 60% of ambient precipitation) in the Yellow River Delta wetlands, we examined how seasonal flooding regulated ecosystem CO2 exchange (NEE), gross ecosystem production (GEP) and ecosystem respiration (ER) response to precipitation changes. Over three years, ecosystem carbon fluxes exhibited a positive asymmetric response along the precipitation gradient, with the increment under wet treatments exceeding the reduction under dry treatments. Compared with the control, the -60% treatment significantly reduced GEP and ER by 9.7% and 9.3% respectively; whereas the +40% and + 60% treatments significantly increased GEP, ER, and NEE by 18.0%, 23.5%, 15.4%, 19.4%, 22.1%, and 29.0% respectively. Moreover, the observed positive asymmetry in ecosystem carbon flux arose because, under reduced precipitation, vegetation coverage and total biomass were less affected by high soil salinity. Additionally, plants coverage responded differently to flooding under precipitation treatments: saline plants were most affected under reduced precipitation, while gramineous plants showed no significant difference. Our results demonstrated that acclimation of vegetation to salinization leads to the asymmetric response of ecosystem carbon exchange along the precipitation gradient, while seasonal flooding may amplify the positive asymmetric response by affecting vegetation community composition in saline wetlands. The findings underscore the importance of seasonal flooding in modulating wetland ecosystem responses within global change manipulation experiments.
WOS关键词COASTAL WETLAND ; CLIMATE-CHANGE ; WATER ; TOLERANCE ; STRESS
WOS研究方向Geology ; Agriculture ; Water Resources
语种英语
WOS记录号WOS:001680101600001
资助机构National Natural Science Foundation of China project ; Yellow River Delta Ecological Research Station of Coastal Wetland ; Chinese Academy of Sciences
源URL[http://ir.yic.ac.cn/handle/133337/42081]  
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.Chinese Acad Sci, Yantai Inst Coastal Zone Res, CAS Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Shandong, Peoples R China
2.Shandong Key Lab Coastal Environm Proc, Yantai 264003, Shandong, Peoples R China
3.Chinese Acad Sci, Yellow River Delta Ecol Res Stn Coastal Wetland, Beijing, Peoples R China
4.Henan Univ, Coll Geog Sci, Kaifeng 475004, Henan, Peoples R China
推荐引用方式
GB/T 7714		 Li, Xinge,Zhu, Wenbo,Zhu, Lianqi,et al. Seasonal flooding amplifies the positive asymmetric response of ecosystem carbon exchange along the precipitation gradient in saline wetlands[J]. CATENA,2026,265:10.
APA Li, Xinge.,Zhu, Wenbo.,Zhu, Lianqi.,Song, Weimin.,Li, Peiguang.,...&Han, Guangxuan.(2026).Seasonal flooding amplifies the positive asymmetric response of ecosystem carbon exchange along the precipitation gradient in saline wetlands.CATENA,265,10.
MLA Li, Xinge,et al."Seasonal flooding amplifies the positive asymmetric response of ecosystem carbon exchange along the precipitation gradient in saline wetlands".CATENA 265(2026):10.

入库方式： OAI收割

来源：烟台海岸带研究所

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