Inundation depth affects ecosystem CO 2 and CH 4 exchange by changing plant productivity in a freshwater wetland in the
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Inundation depth affects ecosystem CO2 and CH4 exchange by changing plant productivity in a freshwater wetland in the Yellow River Estuary Mingliang Zhao & Guangxuan Han & Haitao Wu & Weimin Song & Xiaojing Chu & Juanyong Li & Wendi Qu & Xinge Li & Siyu Wei & Franziska Eller & Changsheng Jiang
Received: 26 January 2020 / Accepted: 16 June 2020 # Springer Nature Switzerland AG 2020
Abstract Aims Climate change (extreme rainfall) and water management activities have led to variation in hydrological regimes, especially inundation, which may alter the function and structure of wetlands as well as wetlandatmosphere carbon (C) exchange. However, the degree to which different inundation depths (standing water depth above the soil surface) affect ecosystem CH4 fluxes, ecosystem respiration (Reco) and net ecosystem CO2 exchange (NEE) remains uncertain in wetland ecosystems.
Methods We conducted a field inundation depth manipulation experiment (no inundation, i.e. only natural precipitation; 0, water-saturated; 5, 10, 20, 30 and 40 cm inundation depth) in a freshwater wetland of the Yellow River Delta, China. The CH4 fluxes, Reco and NEE were measured with a static chamber technique during the growing seasons (May–October) of 2018 and 2019. Results Inundation depth significantly increased plant shoot density, above-water level leaf area index (WLAI), above-water level plant shoot height (WHeight), aboveground and belowground biomass of
Highlights 1. Variations in ecosystem CH4 and CO2 exchange at different inundation depths are addressed 2. Inundation depth increased the reed density, height, leaf area index and biomass 3. Ecosystem CH4 and CO2 exchange exhibited parabolic responses to inundation depth 4. Plant traits correlated with ecosystem C exchange under different inundation depths 5. Inundation decreased the global warming potential during the growing season Responsible Editor: Hans Lambers. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11104-020-04612-2) contains supplementary material, which is available to authorized users. M. Zhao : C. Jiang (*) State Cultivation Base of Eco-agriculture for Southwest Mountainous Land, College of Resources and Environment, Southwest University, Chongqing 400715, China e-mail: [email protected]
M. Zhao : G. Han (*) : W. Song : X. Chu : J. Li : W. Qu : X. Li : S. Wei CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences(CAS), Yantai, Shandong 264003, People’s Republic of China e-mail: [email protected]
Plant Soil
the dominant grass Phragmites australis in both years. Meanwhile, inundation depth increased the CH4 fluxes, Reco (except for 0 cm) and NEE compared to no inundation, which could be attributed partly to the increased plant productivity (shoot density, WLAI, WHeight, biomass). Additionally, the CH4 fluxes, Reco or NEE exhibited parabolic responses to inundation depth. Furthermore, global warming potentia
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