Application of stable isotopes to examine N proportions within a simulated<i>Aegiceras corniculatum</i>wetland

Miao, Shen Yu; Chen, Weilin; Tao, Wenqin; Dai, Wentan; Long, Liandi; Huang, Jinling

doi:10.1080/09542299.2017.1339573

Cited by 5 publications

(3 citation statements)

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“…not, dependant on a supply from leaves to synthesize their OM and thus more fractionation may occur leading to enrichment of 13 C in the roots. These results are consistent with a similar pattern observed in a greenhouse-based simulated mangrove Aegiceras corniculatum wetland system, where roots were heavier than leaves due to translocation of assimilated 13 C-enriched carbohydrates to the roots [8,33].…”

Section: Plos Onesupporting

confidence: 90%

“…On the other hand, the δ 13 C reflects source carbon, irradiance, temperature and becomes more enriched when vigorous photosynthesis occurs [ 6 , 7 ]. In a greenhouse-based simulated mangrove wetland, increasing salinity and water levels significantly increased the δ 13 C and δ 15 N values in plant organs, but after treatment with salinity of more than 30 ‰, the δ 15 N value of plant organs did not increase implying that changes in salinity and water levels due to climatic changes may impact N cycling processes in wetland systems [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

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Sources and pathways of carbon and nitrogen of macrophytes and sediments using stable isotopes in Al-Kharrar Lagoon, eastern Red Sea coast, Saudi Arabia

Abu-Zied,

Orif,

Bantan

et al. 2024

PLoS ONE

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Elemental ratios (δ13C, δ15N and C/N) and carbon and nitrogen concentrations in macrophytes, sediments and sponges of the hypersaline Al-Kharrar Lagoon (KL), central eastern Red Sea coast, were measured to distinguish their sources, pathways and see how they have been influenced by biogeochemical processes and terrestrial inputs. The mangroves and halophytes showed the most depleted δ13C values of –27.07±0.2 ‰ and –28.34±0.4 ‰, respectively, indicating their preferential 12C uptake, similar to C3-photosynthetic plants, except for the halophytes Atriplex sp. and Suaeda vermiculata which showed δ13C of –14.31±0.6 ‰, similar to C4-plants. Macroalgae were divided into A and B groups based on their δ13C values. The δ13C of macroalgae A averaged –15.41±0.4 ‰, whereas macroalgae B and seagrasses showed values of –7.41±0.8 ‰ and –7.98 ‰, suggesting uptake of HCO3– as a source for CO2 during photosynthesis. The δ13C of sponges was –10.7±0.3 ‰, suggesting that macroalgae and seagrasses are their main favoured diets. Substrates of all these taxa showed δ13C of –15.52±0.8 ‰, suggesting the KL is at present a macroalgae-dominated lagoon. The δ15N in taxa/sediments averaged 1.68 ‰, suggesting that atmospheric N2-fixation is the main source of nitrogen in/around the lagoon. The heaviest δ15N (10.58 ‰) in halophytes growing in algal mats and sabkha is possibly due to denitrification and ammonia evaporation. The macrophytes in the KL showed high C %, N %, and C/N ratios, but this is not indicated in their substrates due possibly to a rapid turnover of dense, hypersaline waters carrying most of the detached organic materials out into the Red Sea. The δ13C allowed separation of subaerial from aquatic macrophytes, a proxy that could be used when interpreting paleo-sea level or paleoclimatic changes from the coastal marine sediments.

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Section: Plos Onesupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Sources and pathways of carbon and nitrogen of macrophytes and sediments using stable isotopes in Al-Kharrar Lagoon, eastern Red Sea coast, Saudi Arabia

Abu-Zied,

Orif,

Bantan

et al. 2024

PLoS ONE

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“…Water level and hydroperiod are known to influence all biogeochemical processes in wetlands (Miao et al, ), and researchers have argued that wetland hydrological connectivity should significantly influence downstream biogeochemical functions (Leibowitz, ; Marton et al, ; Rains et al, ). Although modelling studies have supported this argument (e.g., Ameli & Creed, ; Evenson et al, ), the relationship between surface hydrological connectivity of wetlands to adjacent waters and the amount and composition of DOM exported by these systems has received little empirical investigation.…”

Section: Introductionmentioning

confidence: 99%

Dissolved organic matter variations in coastal plain wetland watersheds: The integrated role of hydrological connectivity, land use, and seasonality

Hosen

Armstrong

Palmer

2018

Hydrological Processes

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Dissolved organic matter (DOM) is integral to fluvial biogeochemical functions, and wetlands are broadly recognized as substantial sources of aromatic DOM to fluvial networks.Yet how land use change alters biogeochemical connectivity of upland wetlands to streams remains unclear. We studied depressional geographically isolated wetlands on the Delmarva Peninsula (USA) that are seasonally connected to downstream perennial waters via temporary channels. Composition and quantity of DOM from 4 forested, 4 agricultural, and 4 restored wetlands were assessed. Twenty perennial streams with watersheds containing wetlands were also sampled for DOM during times when surface connections were present versus absent. Perennial watersheds had varying amounts of forested wetland (0.4-82%) and agricultural (1-89%) cover. DOM was analysed with ultraviolet-visible spectroscopy, fluorescence spectroscopy, dissolved organic carbon (DOC) concentration, and bioassays. Forested wetlands exported more DOM that was more aromatic-rich compared with agricultural and restored wetlands. DOM from the latter two could not be distinguished suggesting limited recovery of restored wetlands;DOM from both was more protein-like than forested wetland DOM. Perennial streams with the highest wetland watershed cover had the highest DOC levels during all seasons; however, in fall and winter when temporary streams connect forested wetlands to perennial channels, perennial DOC concentrations peaked, and composition was linked to forested wetlands. In summer, when temporary stream connections were dry, perennial DOC concentrations were the lowest and protein-like DOM levels the highest. Overall, DOC levels in perennial streams were linked to total wetland land cover, but the timing of peak fluxes of DOM was driven by wetland connectivity to perennial streams.Bioassays showed that DOM linked to wetlands was less available for microbial use than protein-like DOM linked to agricultural land use. Together, this evidence indicates that geographically isolated wetlands have a significant impact on downstream water quality and ecosystem function mediated by temporary stream surface connections.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Hydrogeomorphic indicators of wetland health inferred from multi-temporal remote sensing data for a new Ramsar site (Kaabar Tal), India

Singh

Sinha

2021

Ecological Indicators

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Application of stable isotopes to examine N proportions within a simulatedAegiceras corniculatumwetland

Abstract: Salinity levels and drought status of coastal wetlands may be strongly affected by climate change, and changes in the nitrogen cycle of mangrove wetlands may also be affected. We established combinations of three salinity and water levels with applied stable isotope

Cited by 5 publications

References 46 publications

Sources and pathways of carbon and nitrogen of macrophytes and sediments using stable isotopes in Al-Kharrar Lagoon, eastern Red Sea coast, Saudi Arabia

Sources and pathways of carbon and nitrogen of macrophytes and sediments using stable isotopes in Al-Kharrar Lagoon, eastern Red Sea coast, Saudi Arabia

Dissolved organic matter variations in coastal plain wetland watersheds: The integrated role of hydrological connectivity, land use, and seasonality

Hydrogeomorphic indicators of wetland health inferred from multi-temporal remote sensing data for a new Ramsar site (Kaabar Tal), India

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