Seasonal changes in the contribution of root respiration to total soil respiration in a freshwater marsh in Sanjiang Plain, Northeast China

Li, Yingchen; Hou, Cuicui; Song, Chen; Guo, Yuedong

doi:10.1007/s12665-016-5592-7

Cited by 15 publications

(12 citation statements)

References 30 publications

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“…The CO 2 fluxes in the oil contaminated soils were much lower than those reported for YRD (2–331 mg·m −2 ·hr −1 ; Han et al, ; Song, Zhang, & Shao, ), which could be resulted from the inhibition of soil microbial respiration caused by oil contamination (Liang et al, ; Liang et al, ). In the natural wetland soils, the root respiration could contribute 20–80% of the total in situ soil respiration (Hanson, Edwards, Garten, & Andrews, ; Li, Hou, Song, & Guo, ). In this study, higher CO 2 fluxes in uncontaminated plots than that in uncontaminated soils could be partially attributed to root systems, as a result of incomplete removal of vegetation before sampling.…”

Section: Resultsmentioning

confidence: 99%

Increased soil methane emissions and methanogenesis in oil contaminated areas

Yang

Qian

et al. 2018

Land Degrad Dev

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Crude oil exploration and related activities cause severe soil contamination and land degradation. However, how soil CH4 and CO2 fluxes respond to oil contamination is poorly understood. To address this question, we conducted in situ investigation of CH4 and CO2 emissions in the Shengli Oilfield, China. CH4 emissions from contaminated soils were 60–1,800 μg·m−2·hr−1, much higher than those from uncontaminated soils (29–33 μg·m−2·hr−1). CO2 fluxes of 2–78 mg·m−2·hr−1 were lower from contaminated soils compared with uncontaminated controls (78–104 mg·m−2·hr−1). The variance of CH4 and CO2 fluxes could be explained to 78.0% by soil properties and oil well age (p < .001) as suggested by the redundancy analysis and the variance partitioning analysis. On the basis of the Illumina MiSeq sequencing of the archaeal 16S rRNA gene, the relative abundance of methanogens over archaea increased by 8 times in contaminated soils compared with that in the uncontaminated soils, suggesting enhanced methanogenesis processes. The proportion of hydrogenotrophic methanogens over the total methanogens increased from 35% in the uncontaminated soil to 43% in the contaminated soils, consistent with the higher apparent fractionation factor (αC) in the stable isotope analysis. Both microbial and isotopic results suggested that the hydrogenotrophic methanogenesis relatively enhanced with the oil contamination, with less dominance of the acetoclastic methanogenesis. The dramatically increased CH4 emissions under oil contamination call for great attention as a potentially important anthropogenic source of CH4 in the atmosphere.

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Section: Resultsmentioning

confidence: 99%

Increased soil methane emissions and methanogenesis in oil contaminated areas

Yang

Qian

et al. 2018

Land Degrad Dev

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“…, Li et al. ). As freshwater vegetation becomes more stressed with elevated salinity, a reduction in root respiration is possible.…”

Section: Discussionmentioning

confidence: 99%

“…Then, as salt-tolerant vegetation becomes established, organic matter inputs increase and concurrently, so does microbial respiration. Another possible factor contributing to lower soil CO 2 efflux with elevated salinity is a reduction in root respiration, which can account for anywhere between 22 and 81% of overall soil respiration (Wang et al 2006, Li et al 2016. As freshwater vegetation becomes more stressed with elevated salinity, a reduction in root respiration is possible.…”

Section: Effects Of Salinity On Plant Biomass and C Fluxmentioning

confidence: 99%

Phosphorus alleviation of salinity stress: effects of saltwater intrusion on an Everglades freshwater peat marsh

Wilson

Servais

Charles

et al. 2019

Ecology

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Saltwater intrusion and salinization of coastal wetlands around the world are becoming a pressing issue due to sea level rise. Here, we assessed how a freshwater coastal wetland ecosystem responds to saltwater intrusion. In wetland mesocosms, we continuously exposed Cladium jamaicense Crantz (sawgrass) plants and their peat soil collected from a freshwater marsh to two factors associated with saltwater intrusion in karstic ecosystems: elevated loading of salinity and phosphorus (P) inputs. We took repeated measures using a 2 × 2 factorial experimental design (n = 6) with treatments composed of elevated salinity (~9 ppt), P loading (14.66 μmol P/d), or a combination of both. We measured changes in water physicochemistry, ecosystem productivity, and plant biomass change over two years to assess monthly and two‐year responses to saltwater intrusion. In the short‐term, plants exhibited positive growth responses with simulated saltwater intrusion (salinity + P), driven by increased P availability. Despite relatively high salinity levels for a freshwater marsh (~9 ppt), gross ecosystem productivity (GEP), net ecosystem productivity (NEP), and aboveground biomass were significantly higher in the elevated salinity + P treated monoliths compared to the freshwater controls. Salinity stress became evident after extended exposure. Although still higher than freshwater controls, GEP and NEP were significantly lower in the elevated salinity + P treatment than the +P treatment after two years. However, elevated salinity decreased live root biomass regardless of whether P was added. Our results suggest that saltwater intrusion into karstic freshwater wetlands may initially act as a subsidy by stimulating aboveground primary productivity of marsh plants. However, chronic exposure to elevated salinity results in plant stress, negatively impacting belowground peat soil structure and stability through a reduction in plant roots.

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“…Roots are another factor that could be causing this discrepancy in soil CO 2 efflux across experiments. Root respiration has been shown to account for anywhere between 22 and 81% of overall soil respiration (Li et al, 2016;Wang et al, 2006). Under inundated conditions, root respiration is likely to be diminished as plants will retain oxygen in order to avoid resorting to alcoholic fermentation, a process that produces ethanol, a plant toxin (Vartapetian and Jackson, 1997).…”

Section: Plant Losses Mediate C Flux and Biogeochemistrymentioning

confidence: 99%

Drivers and Mechanisms of Peat Collapse in Coastal Wetlands

Wilson¹,

Servais²,

Charles³

et al.

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It's been a long journey, and there are many people to thank who helped me get to this point. I would like to first and foremost thank my two wonderful advisors, Dr. Tiffany Troxler and Dr. Jennifer Richards, for taking a chance on me and allowing me the freedom to craft my research. Their constant guidance and feedback helped develop not only this dissertation but my character as well. I want to especially thank one member of my committee, Dr. John Kominoski. John took me into his lab from day one and has contributed immensely to my growth as a scientist. Long discussions with John and constant feedback from him accelerated the advancement of my work. I would also like to that the members of my committee: Dr. Steve Oberbauer and Dr. Len Scinto. Without their helpful comments on my project and use of their instruments, I would not have been able to complete my dissertation. A one last special shout out to my unofficial committee member, Dr. Evelyn Gaiser. Evelyn's constant positivity and insights guided so much of my research and decisions. There are a few graduate students who I have been working closely with during my time at FIU: Sean Charles, Viviana Mazzei, Nick Schulte, and Shelby Servais. We all started at the same time and have been providing each other with project guidance, emotional support, and an ear to voice endless rants. It is their motivation that has kept me going. Long conversations in the lab had led to many new research insights. The research I conducted was part of a very large collaborative effort among many organizations, and it would impossible for me to not thank them.

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Seasonal changes in the contribution of root respiration to total soil respiration in a freshwater marsh in Sanjiang Plain, Northeast China

Cited by 15 publications

References 30 publications

Increased soil methane emissions and methanogenesis in oil contaminated areas

Increased soil methane emissions and methanogenesis in oil contaminated areas

Phosphorus alleviation of salinity stress: effects of saltwater intrusion on an Everglades freshwater peat marsh

Drivers and Mechanisms of Peat Collapse in Coastal Wetlands

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