Inundation depth affects ecosystem CO2 and CH4 exchange by changing plant productivity in a freshwater wetland in the Yellow River Estuary

Zhao, Mengli; Wu, Haitao; Song, Weimin; Chu, Xiaoqing; Li, Juanyong; Qu, Wendi; Li, Xinge; Wei, Siyu; Eller, Franziska; Jiang, Changsheng

doi:10.1007/s11104-020-04612-2

Cited by 15 publications

(5 citation statements)

References 68 publications

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“…Wright et al, 2014), thus influencing ecosystem C exchange. In this experiment, inundation depth significantly increased CO 2 uptake (Figure 3a-c), possibly due to the increased plant productivity (Zhao et al, 2020). NEE is the result of gross primary production and ecosystem respiration, which could represent the ability of plants to absorb carbon.…”

Section: Effect Of Inundation Depth On Plant-mediated Ch4 Productionmentioning

confidence: 71%

“…Furthermore, the aerenchyma of vascular plants can transport O 2 to the rhizosphere and promote CH 4 oxidation in the microaerobic environment under inundated conditions (Bridgham et al, 2013;Henneberg et al, 2012). In a previous study by Zhao et al (2020), above-ground biomass and below-ground biomass under 30 and 40 cm inundation depths were higher than those under 0 and 5 cm inundation depths, which indicated that the deeper the inundation, the more the CH 4 was oxidized, and probably resulted in less plant-mediated CH 4 emissions under 30 and 40 cm inundation depths.…”

Section: Effect Of Inundation Depth On the Plantmediated Ch 4 Transportmentioning

confidence: 90%

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Inundation depth stimulates plant‐mediated CH₄ emissions by increasing ecosystem carbon uptake and plant height in an estuarine wetland

Zhao

Song

et al. 2023

Functional Ecology

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1. Plant-mediated CH 4 emission is an important part of the ecosystem CH 4 emission from vegetated wetlands. Inundation depth may alter the potential magnitude of CH 4 releases by changing CH 4 production and plant transport, but the relationships between plant-mediated CH 4 emissions and inundation depth are still uncertain, especially for estuarine wetlands with changeable hydrological processes. Besides, there are conflicting results regarding the role of inundation depth in plant-mediated CH 4 emissions. 2. Here we conducted a novel inundation depth experiment (0, 5, 10, 20, 30 and 40 cm inundation depth) dominated by Phragmites australis in the Yellow River estuary, China. Soil CH 4 emissions, ecosystem CH 4 emissions, net ecosystem CO 2 exchange (NEE), soil organic carbon (SOC) and plant traits were measured during the growing seasons of 2018, 2019 and 2020. Plant-mediated CH 4 emissions were the difference between ecosystem CH 4 emissions and soil CH 4 emissions. 3. The results showed that inundation depth decreased soil CH 4 emissions but increased ecosystem CH 4 emissions. Plant-mediated CH 4 transport from Phragmites australis accounted for 99% of total ecosystem CH 4 emissions under different inundation depths. Inundation depth strongly stimulated plant-mediated CH 4 emission from 0 to 20 cm during the growing seasons. The increased NEE enhanced plant-mediated CH 4 emissions by altering production, suggesting that carbon components derived from photosynthetic carbon input may benefit CH 4 production. Additionally, the increased plant height promoted CH 4 emission by regulating plant transport, indicating that plant traits may play an important role in transport of CH 4 . 4. Our findings indicated that NEE and plant height play an important role in plantmediated CH 4 emissions under different inundation depths in estuarine wetland.This study also highlights that hydrological regimes and plant traits are essential for the estimation of CH 4 emissions in future projections of global wetland changes.

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Section: Effect Of Inundation Depth On Plant-mediated Ch4 Productionmentioning

confidence: 71%

Section: Effect Of Inundation Depth On the Plantmediated Ch 4 Transportmentioning

confidence: 90%

Inundation depth stimulates plant‐mediated CH₄ emissions by increasing ecosystem carbon uptake and plant height in an estuarine wetland

Zhao

Song

et al. 2023

Functional Ecology

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“…The highest percentage of precipitation occurs from June to September. The soil texture is mainly a sandy clay loam with 6.54 g kg −1 soil organic matter content at 0-20 cm depth (Zhao M. et al, 2020). At the sampling site, inundation treatment was applied from April to October of each year beginning in 2017.…”

Section: Study Sitementioning

confidence: 99%

Fungi and cercozoa regulate methane-associated prokaryotes in wetland methane emissions

Wang

Zhao²,

Du³

et al. 2023

Front. Microbiol.

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Wetlands are natural sources of methane (CH4) emissions, providing the largest contribution to the atmospheric CH4 pool. Changes in the ecohydrological environment of coastal salt marshes, especially the surface inundation level, cause instability in the CH4 emission levels of coastal ecosystems. Although soil methane-associated microorganisms play key roles in both CH4 generation and metabolism, how other microorganisms regulate methane emission and their responses to inundation has not been investigated. Here, we studied the responses of prokaryotic, fungal and cercozoan communities following 5 years of inundation treatments in a wetland experimental site, and molecular ecological networks analysis (MENs) was constructed to characterize the interdomain relationship. The result showed that the degree of inundation significantly altered the CH4 emissions, and the abundance of the pmoA gene for methanotrophs shifted more significantly than the mcrA gene for methanogens, and they both showed significant positive correlations to methane flux. Additionally, we found inundation significantly altered the diversity of the prokaryotic and fungal communities, as well as the composition of key species in interactions within prokaryotic, fungal, and cercozoan communities. Mantel tests indicated that the structure of the three communities showed significant correlations to methane emissions (p < 0.05), suggesting that all three microbial communities directly or indirectly contributed to the methane emissions of this ecosystem. Correspondingly, the interdomain networks among microbial communities revealed that methane-associated prokaryotic and cercozoan OTUs were all keystone taxa. Methane-associated OTUs were more likely to interact in pairs and correlated negatively with the fungal and cercozoan communities. In addition, the modules significantly positively correlated with methane flux were affected by environmental stress (i.e., pH) and soil nutrients (i.e., total nitrogen, total phosphorus and organic matter), suggesting that these factors tend to positively regulate methane flux by regulating microbial relationships under inundation. Our findings demonstrated that the inundation altered microbial communities in coastal wetlands, and the fungal and cercozoan communities played vital roles in regulating methane emission through microbial interactions with the methane-associated community.

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“…Increased soil respiration rate by a more large size of precipitation was likely due to favorable soil microbial activity and community composition ( Huang et al, 2018 ) or plant growth ( Zhang et al, 2019 ; Zhou et al, 2019 ), litter decomposition ( Canarini et al, 2017 ; Qin et al, 2019 ), carbon substrate availability ( Wang et al, 2020 ), and soil salinization ( Han et al, 2015 ; Zhao et al, 2020 ). Our previous results revealed that precipitation treatments in a coastal wetland significantly affected soil respiration through a series of abiotic and biotic processes, mainly by changing soil water and salt conditions ( Li et al, 2021 ; Huang et al, 2023 ).…”

Section: Introductionmentioning

confidence: 99%

Moderate increase of precipitation stimulates CO2 production by regulating soil organic carbon in a saltmarsh

Zhang,

Han,

Zhou

et al. 2024

Front. Microbiol.

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Saltmarsh is widely recognized as a blue carbon ecosystem with great carbon storage potential. Yet soil respiration with a major contributor of atmospheric CO2 can offset its carbon sink function. Up to date, mechanisms ruling CO2 emissions from saltmarsh soil remain unclear. In particular, the effect of precipitation on soil CO2 emissions is unclear in coastal wetlands, due the lack of outdoor data in real situations. We conducted a 7-year field manipulation experiment in a saltmarsh in the Yellow River Delta, China. Soil respiration in five treatments (−60%, −40%, +0%, +40%, and + 60% of precipitation) was measured in the field. Topsoils from the last 3 years (2019–2021) were analyzed for CO2 production potential by microcosm experiments. Furthermore, quality and quantity of soil organic carbon and microbial function were tested. Results show that only the moderate precipitation rise of +40% induced a 66.2% increase of CO2 production potential for the microcosm experiments, whereas other data showed a weak impact. Consistently, soil respiration was also found to be strongest at +40%. The CO2 production potential is positively correlated with soil organic carbon, including carbon quantity and quality. But microbial diversity did not show any positive response to precipitation sizes. r-/K-strategy seemed to be a plausible explanation for biological factors. Overall, our finding reveal that a moderate precipitation increase, not decrease or a robust increase, in a saltmarsh is likely to improve soil organic carbon quality and quantity, and bacterial oligotroph:copiotroph ratio, ultimately leading to an enhanced CO2 production.

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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

Cited by 15 publications

References 68 publications

Inundation depth stimulates plant‐mediated CH₄ emissions by increasing ecosystem carbon uptake and plant height in an estuarine wetland

Inundation depth stimulates plant‐mediated CH₄ emissions by increasing ecosystem carbon uptake and plant height in an estuarine wetland

Fungi and cercozoa regulate methane-associated prokaryotes in wetland methane emissions

Moderate increase of precipitation stimulates CO2 production by regulating soil organic carbon in a saltmarsh

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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

Cited by 15 publications

References 68 publications

Inundation depth stimulates plant‐mediated CH4 emissions by increasing ecosystem carbon uptake and plant height in an estuarine wetland

Inundation depth stimulates plant‐mediated CH4 emissions by increasing ecosystem carbon uptake and plant height in an estuarine wetland

Fungi and cercozoa regulate methane-associated prokaryotes in wetland methane emissions

Moderate increase of precipitation stimulates CO2 production by regulating soil organic carbon in a saltmarsh

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Inundation depth stimulates plant‐mediated CH₄ emissions by increasing ecosystem carbon uptake and plant height in an estuarine wetland

Inundation depth stimulates plant‐mediated CH₄ emissions by increasing ecosystem carbon uptake and plant height in an estuarine wetland