From Bulk to Nano: Formation, Features, and Functions of Nano-Black Carbon in Biogeochemical Processes

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(36), P. 15910 - 15925

Published: Aug. 27, 2024

Globally increasing wildfires and widespread applications of biochar have led to a growing amount black carbon (BC) entering terrestrial ecosystems. The significance BC in sequestration, environmental remediation, the agricultural industry has long been recognized. However, formation, features, functions nanosized BC, which is one most active fractions continuum during global climate change, are poorly understood. This review highlights surface reactivity (sorption, redox, heteroaggregation), biotic, abiotic transformations nano-BC, its major differences compared other engineered nanomaterials. Potential nano-BC including suspending agent, soil amendment, nanofertilizer elucidated based on unique properties functions. Future studies suggested develop more reliable detection techniques provide multidimensional information samples, explore critical role promoting planetary health from perspective, extend multifield with lower footprint but higher efficiency.

Language: Английский

---

Macroalgal virosphere assists with host–microbiome equilibrium regulation and affects prokaryotes in surrounding marine environments

The ISME Journal, Journal Year: 2024, Volume and Issue: 18(1)

Published: Jan. 1, 2024

The microbiomes in macroalgal holobionts play vital roles regulating growth and ocean carbon cycling. However, the virospheres remain largely underexplored, representing a critical knowledge gap. Here we unveil that holobiont of kelp (Saccharina japonica) harbors highly specific unique epiphytic/endophytic viral species, with novelty (99.7% unknown) surpassing even extreme marine habitats (e.g. deep-sea hadal zones), indicating virospheres, despite being closest to us, are among least understood. These viruses potentially maintain microbiome equilibrium for health via lytic-lysogenic infections expression folate biosynthesis genes. In-situ mesocosm cultivation metagenomic mining revealed profoundly reshaped surrounding seawater sediment virus-prokaryote pairings through changing environmental conditions virus-host migrations. Some epiphytic could infect autochthonous bacteria after deposition. Moreover, presence ample auxiliary metabolic genes polysaccharide laminarin) degradation underscores underappreciated influence on This study provides key insights into understanding previously overlooked ecological significance within macroalgae-prokaryotes-virus tripartite relationship.

Language: Английский

---

Seaweed (Porphyra) cultivation enhances production of autochthonous refractory dissolved organic matter in coastal ecosystems

Frontiers in Marine Science, Journal Year: 2025, Volume and Issue: 12

Published: Feb. 6, 2025

Seaweed cultivation contributes to coastal carbon sequestration making it a compelling strategy mitigate global climate change. Porphyra (commonly known as nori) is an economically important seaweed have high release rates for biogenic dissolved and particulate organic matter (DOM POM). However, the impact of on dynamics remains unclear. To fill this knowledge gap, we conducted investigations examining quantity optical properties DOM POM, microbial community structures relevant environmental factors along continuum from subtropical river through its adjacent zone during non-cultivation periods. Dissolved (DOC) concentration was significantly elevated versus period, while (POC) decreased, thereby resulting in higher DOC/POC ratio water column. Endmember mixing analysis further suggested that autochthonous dominated both periods, with limited inputs terrestrial carbon. Redundancy revealed more modules mediated transformations leading 169% estuarine addition microbially-sourced humic-like C3 compared period. Our findings demonstrate enhanced by promoting production transformation refractory DOM, which has implications sustainable management development blue strategies.

Language: Английский

---

Optical Characteristics of Dissolved, Particulate and Sedimentary Organic Matter in Coastal Porphyra Cultivation Zone: A Case Study of Dayu Bay, China

Water, Journal Year: 2025, Volume and Issue: 17(4), P. 571 - 571

Published: Feb. 17, 2025

Seaweed plays a critical role in marine carbon sequestration due to its high release rate of organic matter. However, the impacts Porphyra cultivation on concentration and composition dissolved, particulate sedimentary matter (DOM, POM SOM) coastal zones remain unclear. Herein, we investigated optical properties DOM, SOM along transect from subtropical Chi River adjacent zone Dayu Bay (southeast China) during late stage. The results revealed that all types were predominantly characterized by highly autochthonous sources, contrasting sharply with allochthonous, terrestrial sources observed at freshwater sites. estuarine mixing model principal component analysis further indicated dynamics are primarily controlled cultivation, relatively limited contributions riverine inputs, sediment porewater sources. leads significant additions protein-like components water sediment. Microbial degradation incubations DOM demonstrated promotes situ production humic-like (peak M) water. exhibited higher microbial transformation efficiency into refractory than POM, suggesting more substantial sequestration. Our findings underscore potential enhance ecosystems.

Language: Английский

---

Neglecting recalcitrant DOC would lead to serious underestimation of seaweed farming’s contribution to ocean carbon sequestration

Science China Earth Sciences, Journal Year: 2025, Volume and Issue: 68(5), P. 1419 - 1428

Published: April 14, 2025

Language: Английский

---

Constraining the Composition and Biochemical Activity of Organic Carbon in a Large Eutrophic Estuary using Size-Fractionated Analysis

Environmental Research, Journal Year: 2025, Volume and Issue: unknown, P. 121853 - 121853

Published: May 1, 2025

Language: Английский

---

Spatio-Temporal Dynamics of Particulate Organic Carbon and Its Response to Climate Change: Evidence of the East China Sea from 2003 to 2022

Journal of Marine Science and Engineering, Journal Year: 2025, Volume and Issue: 13(5), P. 963 - 963

Published: May 15, 2025

Particulate organic carbon (POC) plays a crucial role in oceanic climate change. However, existing research is limited by several factors, including the scarcity of long-term data, extensive datasets, and comprehensive understanding POC dynamics. This study utilizes monthly average remote sensing data from MODIS/AQUA satellite to analyze spatiotemporal variations East China Sea 2003 2022. Employing correlation analysis, spatial autocorrelation models, Geodetector model, we explore responses key influencing factors such as climatic elements. The results indicate that concentrations are higher western nearshore areas lower eastern offshore regions (ECS). Additionally, observed be southern compared northern ones. From 2022, exhibited fluctuating downward trend with an annual concentration 121.05 ± 4.57 mg/m3. Seasonally, ranged 105.48 mg/m3 158.36 mg/m3; notably were recorded during spring while summer showed comparatively levels. Specifically, peaked April before rapidly declining May June—reaching minimum—and then gradually increasing again June through December. Correlation analysis revealed significant influences on levels particulate inorganic (PIC), sea surface temperature (SST), chlorophyll (Chl), photosynthetically active radiation (PAR). model further elucidated these vary their impact: Chl was identified having strongest influence (q = 0.84), followed PIC 0.75) SST 0.64) primary factors; PAR recognized secondary factor q 0.30. provides new insights into marine cycling dynamics within context

Language: Английский

---

Kelp dissolved organic carbon release is seasonal and annually enhanced during senescence

Journal of Phycology, Journal Year: 2024, Volume and Issue: 60(4), P. 980 - 1000

Published: July 19, 2024

Macroalgae influence local and global biogeochemical cycles through their production of dissolved organic carbon (DOC). Yet, data remain scarce annualized estimates are typically based on high growth periods without considering seasonal variability. Although the mechanisms active exudation passive leakage need clarifying, ecophysiological stress is known to enhance DOC release. Therefore, from seasonally senescent macroalgae may be overlooked. This study focuses annual kelp Saccharina japonica var. religiosa (class Phaeophyceae) Oshoro Bay, Hokkaido, Japan. Three years (2020-2022) were collected analyzed, with least squares mean release rates established for (n = 88) across 16 incubation experiments (t ≥ 4 d, samples ≥1 · d

Language: Английский

---

Aggregating Synechococcus contributes to particle organic carbon export in coastal estuarine waters: Its lineage features and assembly processes

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 917, P. 170368 - 170368

Published: Jan. 26, 2024

Language: Английский

---

Tapping Carbon Sequestration Potential of Blooming Macroalgae to Mitigate Climate Change

Ocean-Land-Atmosphere Research, Journal Year: 2023, Volume and Issue: 2

Published: Jan. 1, 2023

Macroalgal mariculture is gaining global attention to achieve carbon neutrality due its important contribution ocean sequestration. However, some wild macroalgal species (e.g., Sargassum and Ulva prolifera ) exhibit strong environmental adaptability can cause large-scale, recurrent blooms in oceans, fueled by rising atmospheric CO 2 levels coastal eutrophication. Notably, massive green tides have occurred annually the Yellow Sea for past 17 consecutive years. At late blooming stage, millions of tons U. naturally sink shallow seafloor. The subsequent intense microbial aerobic degradation sinking macroalgae results hypoxia acidification, with most returning atmosphere. Preventing or reducing could enable more storage long term alleviate harmful effects tide. Thus, ecological disasters from may be transformed into useful natural platforms increase We propose an integrated strategy using environmentally friendly minerals montmorillonite calcium carbonate) coagulants polyaluminum chloride), along algicidal bacteria substances, induce rapid flocculation sedimentation macroalgae, reduce negative impacts, minimize generation propagules seeds potential risk future tide outbreaks. This approach potentially a promising tap sequestration mitigate climate change.

Language: Английский

---