Decomposing the Tea Bag Index and finding slower organic matter loss rates at higher elevations and deeper soil horizons in a minerogenic salt marsh DOI Creative Commons

Satyatejas G. Reddy,

W. Reilly Farrell,

Fengrun Wu

et al.

Biogeosciences, Journal Year: 2025, Volume and Issue: 22(2), P. 435 - 453

Published: Jan. 24, 2025

Abstract. Environmental gradients can affect organic matter decay within and across wetlands contribute to spatial heterogeneity in soil carbon stocks. We tested the sensitivity of rates tidal flooding depth a minerogenic salt marsh using Tea Bag Index (TBI). bags were buried at 10 50 cm depths an elevation gradient subtropical Spartina alterniflora Georgia (USA). Plant animal communities properties characterized once, while replicate tea porewaters collected several times over 1 year. TBI faster than prior litterbag studies same marsh, largely due rapid green loss. Rooibos more comparable natural litter, potentially suggesting that is useful as standardized proxy tea. Decay was slowest higher elevations not consistently related other biotic (e.g., plants, crab burrows) or abiotic factors porewater chemistry), indicating local hydrology strongly affected loss rates. 32 %–118 % horizon cm. Rates fastest first 3 months slowed 54 %–60 both between 6 months. further 12 months, but this muted (17 %) compared (50 %). Slower with time unlikely stabilization factor, which similar decreased from demonstrates constrained by environmental conditions deeper rather composition highly litter. Overall, these patterns suggest hydrological setting, affects oxidant introduction reactant removal often overlooked decomposition studies, may be particularly important control on short term (3–12 months).

Language: Английский

Relative increases in CH4 and CO2 emissions from wetlands under global warming dependent on soil carbon substrates DOI
Han Hu, Ji Chen, Feng Zhou

et al.

Nature Geoscience, Journal Year: 2024, Volume and Issue: 17(1), P. 26 - 31

Published: Jan. 1, 2024

Language: Английский

Citations

40
The hidden influence of terrestrial groundwater on salt marsh function and resilience DOI
Julia Guimond, Emilio Grande, Holly A. Michael

et al.

Nature Water, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 3, 2025

Language: Английский

Citations

3
Geomorphic and ecological constraints on the coastal carbon sink DOI
Matthew L. Kirwan, J. Patrick Megonigal, Genevieve L. Noyce

et al.

Nature Reviews Earth & Environment, Journal Year: 2023, Volume and Issue: 4(6), P. 393 - 406

Published: May 30, 2023

Language: Английский

Citations

36
Rapid plant trait evolution can alter coastal wetland resilience to sea level rise DOI
Megan L. Vahsen, Michael J. Blum, J. Patrick Megonigal

et al.

Science, Journal Year: 2023, Volume and Issue: 379(6630), P. 393 - 398

Published: Jan. 26, 2023

Rapid evolution remains a largely unrecognized factor in models that forecast the fate of ecosystems under scenarios global change. In this work, we quantified roles heritable variation plant traits and trait explaining variability forecasts state coastal wetland ecosystems. A common garden study genotypes dominant sedge Schoenoplectus americanus , “resurrected” from time-stratified seed banks, revealed explained key ecosystem attributes such as allocation distribution belowground biomass. Incorporating into an model altered predictions carbon accumulation soil surface accretion (a determinant marsh resilience to sea level rise), demonstrating importance accounting for evolutionary processes when forecasting dynamics.

Language: Английский

Citations

32
The hidden roots of wetland methane emissions DOI Creative Commons
Tiia Määttä, Avni Malhotra

Global Change Biology, Journal Year: 2024, Volume and Issue: 30(2)

Published: Feb. 1, 2024

Abstract Wetlands are the largest natural source of methane (CH 4 ) globally. Climate and land use change expected to alter CH emissions but current future wetland budgets remain uncertain. One important predictor flux, plants, play an role in providing substrates for ‐producing microbes, increasing consumption by oxygenating rhizosphere, transporting from soils atmosphere. Yet, there various mechanistic knowledge gaps regarding extent which plant root systems their traits influence emissions. Here, we present a novel conceptual framework relationships between range processes wetlands. Based on literature review, propose four main ‐relevant categories function: gas transport, carbon substrate provision, physicochemical influences system architecture. Within these categories, discuss how individual production, consumption, transport (PCT). Our findings reveal concerning trait functions influences, mycorrhizae temporal dynamics PCT. We also identify priority research needs such as integrating measurements different function measuring root‐CH linkages along environmental gradients, following standardized ecology protocols vocabularies. Thus, our identifies relevant belowground that will help improve predictions reduce uncertainties budgets.

Language: Английский

Citations

13
Sulfur oxidation and reduction are coupled to nitrogen fixation in the roots of the salt marsh foundation plant Spartina alterniflora DOI Creative Commons
José L. Rolando, Max Kolton, Tianze Song

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: April 29, 2024

Abstract Heterotrophic activity, primarily driven by sulfate-reducing prokaryotes, has traditionally been linked to nitrogen fixation in the root zone of coastal marine plants, leaving role chemolithoautotrophy this process unexplored. Here, we show that sulfur oxidation coupled is a previously overlooked providing macrophytes. In study, recovered 239 metagenome-assembled genomes from salt marsh dominated foundation plant Spartina alterniflora , including diazotrophic and sulfur-oxidizing bacteria. Abundant bacteria encode highly express genes for carbon ( RuBisCO ), nifHDK ) (oxidative- dsrAB especially roots stressed sulfidic reduced sediment conditions. Stressed exhibited highest rates expression level sulfate reduction genes. Close relatives symbionts Candidatus Thiodiazotropha genus contributed ~30% ~20% all dsrA nitrogen-fixing nifK transcripts roots, respectively. Based on these findings, propose symbiosis between S. key ecosystem functioning marshes.

Language: Английский

Citations

10
Long-term fertilization regimes modulate dissolved organic matter molecular chemodiversity and greenhouse gas emissions in paddy soil DOI Creative Commons
Yuanyuan Sun, Weiming Zhang,

Liqun Xiu

et al.

Biochar, Journal Year: 2025, Volume and Issue: 7(1)

Published: March 3, 2025

Language: Английский

Citations

1
Role of n-DAMO in Mitigating Methane Emissions from Intertidal Wetlands Is Regulated by Saltmarsh Vegetations DOI
Zhirui An, Feiyang Chen, Yanling Zheng

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(2), P. 1152 - 1163

Published: Jan. 3, 2024

Coastal wetlands are hotspots for methane (CH4) production, reducing their potential global warming mitigation. Nitrite/nitrate-dependent anaerobic oxidation (n-DAMO) plays a crucial role in bridging carbon and nitrogen cycles, contributing significantly to CH4 consumption. However, the of n-DAMO emissions coastal is poorly understood. Here, ecological functions process different saltmarsh vegetation habitats as well bare mudflats were quantified, underlying microbial mechanisms explored. Results showed that rates higher vegetated (Scirpus mariqueter Spartina alterniflora) than those (P < 0.05), leading an enhanced contribution Compared with other habitats, total was lower Phragmites australis wetland (15.0%), where primarily driven by ferric iron (Fe3+). Genetic statistical analyses suggested roles various may be related divergent communities environmental parameters such sediment pH organic carbon. This study provides important scientific basis more accurate estimation mitigating climate change.

Language: Английский

Citations

8
Satellite derived trends and variability of CO2 concentrations in the Middle East during 2014–2023 DOI Creative Commons
Ricardo Fonseca, Diana Francis

Frontiers in Environmental Science, Journal Year: 2024, Volume and Issue: 11

Published: Jan. 8, 2024

The Middle East has major sources of anthropogenic carbon dioxide (CO 2 ) emissions, but a dearth ground-based measurements precludes an investigation its regional and temporal variability. This is achieved in this work with satellite-derived estimates from the Orbiting Carbon Observatory-2 (OCO-2) OCO-3 missions September 2014 to February 2023. annual maximum minimum column (XCO concentrations are generally reached spring autumn, respectively, typical seasonal cycle amplitude 3–8 ± 0.5 ppmv Arabian Peninsula rising 8–10 1 mid-latitudes. A comparison seasonal-mean XCO values CO emissions estimated using divergence method stresses role played by transport spatial distribution , prevailing arid semi-arid regions that lack persistent vegetation. In 8-year period 2015–2022, concentration United Arab Emirates (UAE) increased at rate about 2.50 0.04 ppmv/year, trend empirical orthogonal function technique revealing hotspot over northeastern UAE southern Iran summer where peak accumulate aided low-level wind convergence. used drive climate change models for different emission scenarios revealed latter overestimated, differences exceeding 10 2022. excess amount can lead over-prediction projected increase temperature region, aspect needs be investigated further. need observational network greenhouse gas better understand variability evaluation remote sensing observations as well models.

Language: Английский

Citations

8
Integrating Tide‐Driven Wetland Soil Redox and Biogeochemical Interactions Into a Land Surface Model DOI Creative Commons
Benjamin N. Sulman, Jiaze Wang, Sophia LaFond‐Hudson

et al.

Journal of Advances in Modeling Earth Systems, Journal Year: 2024, Volume and Issue: 16(4)

Published: April 1, 2024

Abstract Redox processes, aqueous and solid‐phase chemistry, pH dynamics are key drivers of subsurface biogeochemical cycling methanogenesis in terrestrial wetland ecosystems but typically not included carbon cycle models. These omissions may introduce errors when simulating systems where redox interactions fluctuations important, such as wetlands saturation soils can produce anoxic conditions coastal sulfate inputs from seawater influence biogeochemistry. Integrating redox‐sensitive elements could therefore allow models to better represent greenhouse gas production. We describe a model framework that couples the Energy Exascale Earth System Model (E3SM) Land (ELM) with PFLOTRAN biogeochemistry, allowing geochemical processes be integrated land surface simulations. implemented reaction network including aerobic decomposition, fermentation, reduction, sulfide oxidation, methanogenesis, methanotrophy well along iron oxide mineral precipitation dissolution. simulated tidal subject either saltwater or freshwater driven by hydrological dynamics. In simulations inputs, reduction led accumulation sulfide, higher dissolved inorganic concentrations, lower organic methane emissions than inputs. compared measured porewater concentrations Northeastern United States. results demonstrate how networks improve biogeochemistry cycling.

Language: Английский

Citations

8