Characteristics of CH4 and CO2 emissions and influence of water and salinity in the Yellow River delta wetland, China

Chen, Yi‐Ping Phoebe; Guo, Beibei; Zhao, Changsheng; Xing, Baoxiu

doi:10.1016/j.envpol.2018.04.043

Cited by 47 publications

(28 citation statements)

References 37 publications

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“…australis site in New England 25 . Many abiotic factors, such as salinity which influencing the activities of methanogens 28 , inorganic nitrogen (NH 4 + and NO 3 − ) which impacting CH 4 oxidation 29 , 30 , can influence soil CH 4 emission. Other than that, soil functional microbes play an important role in regulating soil CH 4 dynamic 31 .…”

Section: Discussionmentioning

confidence: 99%

Exotic Spartina alterniflora invasion increases CH4 while reduces CO2 emissions from mangrove wetland soils in southeastern China

Gao

Shen

et al. 2018

Sci Rep

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Mangroves are critical in global carbon budget while vulnerable to exotic plant invasion. Spartina alterniflora, one of typical salt marsh plant grows forcefully along the coast of China, has invaded the native mangrove habitats in Zhangjiang Estuary. However, the effects of S. alterniflora invasion on soil carbon gases (CH4 and CO2) emission from mangroves are not fully understood. Accordingly, we conducted a field experiment to investigate the soil CH4 and CO2 emission during growing seasons in 2016 and 2017 at four adjacent wetlands, namely bare mudflat (Mud), Kandelia obovata (KO), Avicennia marina (AM) and S. alterniflora (SA). Potential methane production (PMP), potential methane oxidation (PMO), functional microbial abundance and soil biogeochemical properties were measured simultaneously. Our results indicate that S. alterniflora invasion could dramatically increase soil CH4 emissions mainly due to the enhancement in PMP which facilitated by soil EC, MBC, TOC and mcrA gene abundance. Additionally, S. alterniflora invasion decreases soil CO2 emission. Both heterotrophic microbial respiration (16S rRNA) and methane oxidation (pmoA and ANME-pmoA) are responsible for CO2 emission reduction. Furthermore, S. alterniflora invasion greatly increases GWP by stimulating CH4 emissions. Thus, comparing with mangroves, invasive S. alterniflora significantly (p < 0.001) increases CH4 emission while reduces CO2 emission.

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Section: Discussionmentioning

confidence: 99%

Exotic Spartina alterniflora invasion increases CH4 while reduces CO2 emissions from mangrove wetland soils in southeastern China

Gao

Shen

et al. 2018

Sci Rep

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“…Previous studies have reported seasonal variation of ecosystem C fluxes (CO 2 and CH 4 ) based on continuous flux measurements in the Yellow River Delta [29,30], while this study emphasized the relationship between dry-season ecosystem C rates (GEP, ER, NEE, and CH 4 ) with plant and soil properties. Therefore, dry-season ecosystem C rates were determined in May 2018.…”

Section: Methodsmentioning

confidence: 81%

“…Microbiological processes and the roles of microorganisms could be another reason for the variation in ecosystem CO 2 and CH 4 rates. Their activities are controlled by several biological, chemical, and physical factors in soil [19,20,22,28,29,44]. Therefore, soil properties including soil organic carbon (SOC), total nitrogen (TN), inorganic nitrogen, total phosphorus (TP), available phosphorus (AP), salinity, and pH are closely related to CO 2 and CH 4 fluxes [45].…”

Section: Discussionmentioning

confidence: 99%

“…The Yellow River Delta (YRD) wetland, which is the largest wetland ecosystem in the warm temperate zone of China, has an obvious dry season (April to June) and rainy season (July to September) [26–28]. Previous studies have reported seasonal variations in ecosystem C fluxes (CO 2 and CH 4 ) based on continuous flux measurements [28–30] and found that dry-season had the second largest contribution to the CO 2 and CH 4 emissions in the YRD [29]. Therefore, in this study, we emphasized the relationship between dry-season ecosystem C rates (GEP, ER, NEE, and CH 4 ) with vegetation and soil properties and disentangled their contributions to the C rates.…”

Section: Introductionmentioning

confidence: 99%

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Plant biomass and soil organic carbon are main factors influencing dry-season ecosystem carbon rates in the coastal zone of the Yellow River Delta

Wang

et al. 2019

PLoS ONE

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Coastal wetlands are considered as a significant sink of global carbon due to their tremendous organic carbon storage. Coastal CO2 and CH4 flux rates play an important role in regulating atmospheric CO2 and CH4 concentrations. However, the relative contributions of vegetation, soil properties, and spatial structure on dry-season ecosystem carbon (C) rates (net ecosystem CO2 exchange, NEE; ecosystem respiration, ER; gross ecosystem productivity, GEP; and CH4) remain unclear at a regional scale. Here, we compared dry-season ecosystem C rates, plant, and soil properties across three vegetation types from 13 locations at a regional scale in the Yellow River Delta (YRD). The results showed that the Phragmites australis stand had the greatest NEE (-1365.4 μmol m-2 s-1), ER (660.2 μmol m-2 s-1), GEP (-2025.5 μmol m-2 s-1) and acted as a CH4 source (0.27 μmol m-2 s-1), whereas the Suaeda heteroptera and Tamarix chinensis stands uptook CH4 (-0.02 to -0.12 μmol m-2 s-1). Stepwise multiple regression analysis demonstrated that plant biomass was the main factor explaining all of the investigated carbon rates (GEP, ER, NEE, and CH4); while soil organic carbon was shown to be the most important for explaining the variability in the processes of carbon release to the atmosphere, i.e., ER and CH4. Variation partitioning results showed that vegetation and soil properties played equally important roles in shaping the pattern of C rates in the YRD. These results provide a better understanding of the link between ecosystem C rates and environmental drivers, and provide a framework to predict regional-scale ecosystem C fluxes under future climate change.

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“…Researchers have found that elevated water levels significantly enhance CO 2 uptake in temperate cutover fens (Minke et al, 2016). In addition, in an experiment conducted in the Yellow River Delta, the relationship between CO 2 uptake and water levels was varied with different locations (Chen et al, 2018). Furthermore, ecosystem CO 2 exchange of HWL treatment during the tidal inundation period was nearly completely suppressed (Fig.…”

Section: Response Of Ecosystem Co 2 and Ch 4 Fluxes To Water Levels During The Tidal Inundation Periodmentioning

confidence: 92%

Effect of tidal flooding on ecosystem CO2 and CH4 fluxes in a salt marsh in the Yellow River Delta

Wei

Chu

Song

et al. 2020

Estuarine, Coastal and Shelf Science

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Tidal flooding is the basic hydrological feature of a salt marsh, and controls its ecosystem carbon exchange. However, the response of ecosystem carbon exchange to different stages of tidal flooding remains poorly documented. To further explore this issue, we conducted a field experiment to assess the effect of tidal stages (before flooding stage, rising tide stage, tidal flooding stage and after ebbing stage), water levels (a control, a low water level (LWL), a middle water level (MWL) and a high water level (HWL)) and soil salinity on ecosystem CO 2 and CH 4 fluxes in a salt marsh in the Yellow River Delta. Our results showed that the rising tide stage significantly inhibited the uptake of CO 2 (LWL: 1.49 � 0.23 μmol m À 2 s À 1 ; MWL: 1.10 � 0.35 μmol m À 2 s À 1 ; HWL: 0.54 � 0.08 μmol m À 2 s À 1 ). Meanwhile, the rising tide stage also promoted CH 4 emissions of MWL and HWL treatments (MWL: 0.97 � 0.36 nmol m À 2 s À 1 ; HWL: 0.93 � 0.24 nmol m À 2 s À 1 ). CH 4 emissions of the after ebbing stage was higher than that of the before flooding stage, and this difference was significant of LWL and MWL treatments (LWL: 0.56 � 0.12 vs 0.38 � 0.09 nmol m À 2 s À 1 ; MWL: 0.79 � 0.13 vs 0.40 � 0.09 nmol m À 2 s À 1 ). Moreover, ecosystem CO 2 exchange of the HWL treatment was almost completely suppressed during tidal inundation period. During tidal inundation period, net ecosystem CO 2 exchange (NEE) was significantly positively correlated with water levels, but CH 4 emissions was not significantly affected by water levels. In addition, the rate of CO 2 uptake decreased linearly with soil salinity during the non-inundation period. Therefore, it is necessary to analyze the carbon exchange process coupling with the complete tidal flooding process in future researches.

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Characteristics of CH4 and CO2 emissions and influence of water and salinity in the Yellow River delta wetland, China

Cited by 47 publications

References 37 publications

Exotic Spartina alterniflora invasion increases CH4 while reduces CO2 emissions from mangrove wetland soils in southeastern China

Exotic Spartina alterniflora invasion increases CH4 while reduces CO2 emissions from mangrove wetland soils in southeastern China

Plant biomass and soil organic carbon are main factors influencing dry-season ecosystem carbon rates in the coastal zone of the Yellow River Delta

Effect of tidal flooding on ecosystem CO2 and CH4 fluxes in a salt marsh in the Yellow River Delta

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