Uptake of organic nitrogen by coastal wetland plants under elevated CO2

Cott, Grace M.; Jansen, Marcel A. K.; Megonigal, J. Patrick

doi:10.1007/s11104-020-04504-5

Cited by 9 publications

(8 citation statements)

References 85 publications

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“…This was possibly due to NO − 3 − N not being easily adsorbed by soil particles with negative charges, and its easy leaching into the soil for take up by plants (Jones et al, 2005). Besides, according to the SEM analysis, increased soil DON stimulated RNC, which indicated that DON is another essential available source of N supplies for plant uptake (Figure 7; Kerley and Read, 1995;Alexandre et al, 2015;Cott et al, 2020). Earlier studies revealed that plants can acquire a wide variety of low molecular weight N compounds from DON as the N source, via roots when they grow rapidly (e.g., amino acids, amino sugars, and peptides) (Kerley and Read, 1995;Alexandre et al, 2015;Cott et al, 2020).…”

Section: Plants N Absorptionmentioning

confidence: 95%

“…Besides, according to the SEM analysis, increased soil DON stimulated RNC, which indicated that DON is another essential available source of N supplies for plant uptake (Figure 7; Kerley and Read, 1995;Alexandre et al, 2015;Cott et al, 2020). Earlier studies revealed that plants can acquire a wide variety of low molecular weight N compounds from DON as the N source, via roots when they grow rapidly (e.g., amino acids, amino sugars, and peptides) (Kerley and Read, 1995;Alexandre et al, 2015;Cott et al, 2020). Soil N (e.g., NO − 3 − N and DON) can be absorbed by roots, which promoted the growth and N storage of roots (i.e., RB and RNS).…”

Section: Plants N Absorptionmentioning

confidence: 98%

“…DON is the most active portion of the soil organic N subpool (Rentsch et al, 2007;Cott et al, 2020), which includes lowmolecular weight compounds (e.g., amino acids, polypeptides, and purines) and high-molecular weight compounds (e.g., proteins and chlorophyll) (Quan et al, 2022). In this study, we found that the organic N inputs from roots was the primary source of DON in the natural salt marsh (Figure 7).…”

Section: The Organic N Subpool In the Soil Subsystemmentioning

confidence: 99%

“…The embankment not only changed the process of the organic N inputs from the plant subsystem to the soil subsystem, but also altered the N turnover from the organic N subpools into the inorganic N subpools in the soil subsystem (Figure 7). Generally, the generation of inorganic N in soil is regulated by its organic N content (Cartaxana et al, 1999;Cott et al, 2020). SEM analysis indicated that the major contributor of the soil NH + 4 − N was RON in the natural salt marsh (Figure 7).…”

Section: The Inorganic N Subpool In the Soil Subsystemmentioning

confidence: 99%

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Seasonal soil-plant nitrogen dynamics of a cordgrass salt marsh in response to coastal embankments in Eastern China

Qin

Feng

Zhao³

et al. 2022

Front. Mar. Sci.

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The effects of coastal embankments on nitrogen (N) cycling in the Spartina alterniflora salt marsh have been extensively reported. However, it remains unclear effects of the embankment on the sizes of diverse N subpools in the plant-soil subsystems year-round. This study examined seasonal changes in various N subpools of plant subsystems; soil subsystems [e.g., soil organic N (SON), recalcitrant organic N (RON), labile organic N (LON), dissolved organic N (DON), ammonium N(NH+4 N), and nitrate N(NO3-N)]; N mineralization [e.g., soil net ammonification (RA) and nitrification (RN) rate]; and immobilization [e.g., microbial biomass N (MBN)] in embanked and adjacent S. alterniflora natural salt marshes on the coast of Eastern China. The embankment significantly reduced the litter N storage by 62.7–71.8% over the four seasons and decreased the root N storage by 53.0% during winter. The SON, LON, RON, and N H +4 N concentrations declined significantly by 43.0–60.2%, 35.8–64.8%, 44.9–59.0%, and 20.8–42.2%, respectively, over the four seasons following the embankment construction. Furthermore, the embankment dramatically reduced the DON concentrations by 21.9% in spring, 14.6% in summer, and 10.4% in winter, while notably diminishing the NO3 N concentrations by 33.4% in autumn and 44.9% in winter, and the RA and RN in spring and summer. However, the embankment clearly increased the MBN concentrations during summer and autumn, the NO3 N concentrations in spring, and the RA and RN in winter at different levels. Due to the decreased soil N inputs from plants, the embankment decreased the organic and inorganic N subpools every season to varying degrees, except for the NO3 N concentration in spring. We suggest that the decreased soil salinity following embankment establishment might increase the uptake of ions by microbes, while stimulating the production of MBN. Ultimately, the NO3 N and DON were two vital N sources for S. alterniflora, and plants absorbed N from the soil to promote their biomass, as well as N concentration and storage. This study is conducive toward understanding the mechanisms behind the effects of coastal embankments on the N transfer among various N subpools in the plant and soil systems.

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Section: Plants N Absorptionmentioning

confidence: 95%

Section: Plants N Absorptionmentioning

confidence: 98%

Section: The Organic N Subpool In the Soil Subsystemmentioning

confidence: 99%

Section: The Inorganic N Subpool In the Soil Subsystemmentioning

confidence: 99%

See 2 more Smart Citations

Seasonal soil-plant nitrogen dynamics of a cordgrass salt marsh in response to coastal embankments in Eastern China

Qin

Feng

Zhao³

et al. 2022

Front. Mar. Sci.

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“…The selection of N source by bacteria may also be an evolutionary adaption to resource competition across microbial communities (Treseder et al 2011). Additionally, these adaptations are likely in response to vegetation N uptake with some plant species capable of dynamically adapting to assimilating different organic and inorganic N forms in response to ambient CO 2 concentrations (Cott et al 2018;Cott et al 2020) The ability of bacteria to uptake medium and long chain length FAs in a controlled manner and polymerise into PHA chains, minimises the chances of cytoplasmic dissociation and aids in controlling intracellular pH, while also providing a reservoir for reducing equivalents (López et al 2015;Prieto et al 2016). This mechanism could also be extended as a service to surrounding microbial communities incapable of such adaptations by reducing sediment concentrations of FFAs.…”

Section: Salt Marsh Sedimentsmentioning

confidence: 99%

Biogeochemical properties of blue carbon sediments influence the distribution and monomer composition of bacterial polyhydroxyalkanoates (PHA)

et al. 2023

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Coastal wetlands are highly efficient ‘blue carbon’ sinks which contribute to mitigating climate change through the long-term removal of atmospheric CO2 and capture of carbon (C). Microorganisms are integral to C sequestration in blue carbon sediments and face a myriad of natural and anthropogenic pressures yet their adaptive responses are poorly understood. One such response in bacteria is the alteration of biomass lipids, specifically through the accumulation of polyhydroxyalkanoates (PHAs) and alteration of membrane phospholipid fatty acids (PLFA). PHAs are highly reduced bacterial storage polymers that increase bacterial fitness in changing environments. In this study, we investigated the distribution of microbial PHA, PLFA profiles, community structure and response to changes in sediment geochemistry along an elevation gradient from intertidal to vegetated supratidal sediments. We found highest PHA accumulation, monomer diversity and expression of lipid stress indices in elevated and vegetated sediments where C, nitrogen (N), PAH and heavy metals increased, and pH was significantly lower. This was accompanied by a reduction in bacterial diversity and a shift to higher abundances of microbial community members favouring complex C degradation. Results presented here describe a connection between bacterial PHA accumulation, membrane lipid adaptation, microbial community composition and polluted C rich sediments. Graphical Abstract Geochemical, microbiological and polyhydroxyalkanoate (PHA) gradient in a blue carbon zone.

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High nitrogen uptake and utilization contribute to the dominance of invasive Spartina alterniflora over native Phragmites australis

Zhang

Jinfeng

et al. 2021

Biol Fertil Soils

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Uptake of organic nitrogen by coastal wetland plants under elevated CO2

Cited by 9 publications

References 85 publications

Seasonal soil-plant nitrogen dynamics of a cordgrass salt marsh in response to coastal embankments in Eastern China

Seasonal soil-plant nitrogen dynamics of a cordgrass salt marsh in response to coastal embankments in Eastern China

Biogeochemical properties of blue carbon sediments influence the distribution and monomer composition of bacterial polyhydroxyalkanoates (PHA)

High nitrogen uptake and utilization contribute to the dominance of invasive Spartina alterniflora over native Phragmites australis

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