Journal of Geophysical Research: Biogeosciences最新文献

{"title":"Dissolved Organic Matter Composition and Mineral Characteristics Jointly Control Adsorption Processes","authors":"Mona Abbasi,&nbsp;Marloes Groeneveld,&nbsp;Klaus Kaiser,&nbsp;Karsten Kalbitz,&nbsp;Lars Tranvik,&nbsp;Dolly Kothawala","doi":"10.1029/2025JG009653","DOIUrl":"https://doi.org/10.1029/2025JG009653","url":null,"abstract":"<p>Adsorption of dissolved organic matter (DOM) onto mineral surfaces plays a critical role in the global carbon cycle, influencing carbon stability and sequestration across terrestrial and aquatic ecosystems. Currently, it remains unclear if mineral properties or DOM composition are more relevant for predicting adsorption. Previous studies have only tested the influence of soil particles or DOM on adsorption. Here, we quantified the maximum adsorption capacity (<i>Q</i>_max) of five mineral materials (podzol Bs horizon, agricultural topsoil, glacial stream sediment, kaolinite-dominated clay, synthetic goethite) exposed to five DOM sources (humic lake, peat, leaf litter, algae, and pyrogenic matter). Adsorption characteristics were determined using a modified Langmuir model. <i>Q</i>_max values spanned 31–28,630 mg C kg⁻¹, exceeding previously reported ranges. The results showed that both DOM composition and mineral properties strongly influenced the adsorption capacity. Even for strongly adsorbing mineral materials, such as goethite and a commercial reference clay, <i>Q</i>_max varied widely among DOM sources, with the highest values for peat and the lowest for algae. Likewise, DOM from different sources varied in their adsorption affinities for the different mineral surfaces. One treatment evaluated the effect of removing pre-existing organic matter, showing increased DOM adsorption and highlighting the importance of accounting for mineral-associated organic matter when predicting <i>Q</i>_max. In summary, carbon adsorption on minerals is co-dependent on the characteristics of both the minerals and the DOM. These findings suggest that soil models that do not account for DOM characteristics are limited in predicting the carbon sequestration potentials in soils and aquatic ecosystems.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"131 9","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JG009653","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148994196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Forest Floor Protection: The Critical Defense Against Post-Harvest Soil Carbon Loss","authors":"Brian M. Wallace,&nbsp;J. Marty Kranabetter,&nbsp;Erica B. Lilles,&nbsp;Timothy J. Philpott","doi":"10.1029/2026JG009694","DOIUrl":"https://doi.org/10.1029/2026JG009694","url":null,"abstract":"<p>Understanding the dynamics of soil carbon accumulation and loss following forest harvest is crucial for sustainable forest operations in western Canada. However, the region's diverse climates and forest types complicate broad generalizations regarding disturbance impacts. We synthesized 20 years of soil carbon stock (SCS) data from the British Columbia Long-Term Soil Productivity (BC-LTSP) study with increasing soil compaction and organic matter removal treatments across 12 sites spanning four biogeoclimatic zones. Forest floor (organic) and mineral soil (0–20 cm) SCS were measured pre-harvest and at 5, 10, and 20 years post-harvest. The study evaluated SCS dynamics under three organic matter removal treatments: stem-only harvesting (OM1), whole-tree harvesting (OM2), and an extreme treatment that included both harvest residue and forest floor removal (OM3). Simultaneously, the impact of three compaction treatments was assessed: no compaction (C0), moderate compaction (C1), and heavy compaction (C2). When the forest floor remained intact during harvest, there were insignificant forest floor carbon losses (5%) by Year-20 with a simultaneous increase in mineral soil (14%). Stem-only harvesting (OM1) maintained a larger (15%) SCS pool in the forest floor compared to whole-tree (OM2) harvesting (<i>p</i> = 0.07). There was a substantial (52%) loss in total soil carbon (organic + mineral) from the OM3 treatment by year 5 and SCS was still 33% below pre-harvest levels at Year-20. There was no difference between the C1 and C2 compaction levels with no measurable effect on SCS. Protecting the forest floor from additional harvest disturbance resulted in minimal impact on soil C pools.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"131 9","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026JG009694","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148943295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatial-Temporal Distribution Dynamics of Carbon Storage of Dominant Species in a Subtropical Evergreen Broad-Leaved Forest and Its Influencing Factors","authors":"Bing Juan Duan,&nbsp;Xian Juan Li,&nbsp;Zhi Feng Wen,&nbsp;Lin Li,&nbsp;Shi Guang Wei,&nbsp;Xiao Xue Chu,&nbsp;Ju Yu Lian","doi":"10.1029/2025JG008947","DOIUrl":"https://doi.org/10.1029/2025JG008947","url":null,"abstract":"<p>The dynamics of the spatial-temporal distribution of carbon storage of dominant species in subtropical broad-leaved evergreen forests and the factors affecting them remain poorly understood. In the current study, monitoring data on 20 ha of subtropical broad-leaved evergreen forest in Dinghushan were collected from 2005 to 2020. An allometric growth regression biomass model was used to estimate the carbon storage of dominant species. The data were processed in depth using principal component analysis, correlation analysis, regression analysis based on a spatial error model, and mean difference significance tests. The spatial-temporal dynamics of carbon storage of dominant species from 2005 to 2020 were investigated, along with its response to biodiversity and habitat heterogeneity. The results showed that the total carbon storage and the total number of individuals of the dominant species in this forest community continued to decline over the study period. Dominant species' carbon storage showed divergent correlations: negative with structural diversity and positive with species diversity, both intensifying temporally. Concavity-convexity as a single factor significantly influenced carbon storage distribution in dominant species, while the combined effects of topographic factors exerted stronger influences than individual factors, with habitat heterogeneity being the key driver of their spatial differentiation. Our study reveals that biodiversity and environmental factors jointly shape spatiotemporal patterns of dominant species' carbon storage in subtropical broad-leaved forests. Further research is needed on the different contributions of dominant and non-dominant species to community carbon storage and their influencing factors to support targeted conservation and carbon sink function assessment of regional forests.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"131 9","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"White Carbon: Bringing Managed Salterns Into Coastal Carbon Accounting","authors":"Haibo He","doi":"10.1029/2026JG010199","DOIUrl":"https://doi.org/10.1029/2026JG010199","url":null,"abstract":"<p>The emerging concept of white carbon draws attention to carbon storage, burial, and greenhouse-gas balance in managed hypersaline coastal ponds, systems rarely considered in conventional blue carbon frameworks or coastal carbon budgets. These ponds can store organic carbon in sediments while exchanging CO₂ and CH₄ with the atmosphere, but their net climate role depends on salinity, metabolism, hydrology, sedimentation, and management. Alexandre et al. (2026, https://doi.org/10.1029/2025JG009016) provide an important case study by integrating air–water greenhouse-gas fluxes with sediment organic carbon storage and burial in a traditional salt production pond. Their findings suggest that the investigated saltern may function as a net carbon sink under the observed conditions, while emphasizing that white carbon should be treated as a testable, context-dependent framework rather than an established or generalized carbon-sink category. Comparative, mechanistically informed, and better-constrained carbon budgets are needed to determine when managed salterns function as net sinks or sources.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"131 9","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026JG010199","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Timing of Albedo Declines With Reforestation","authors":"Christopher A. Williams,&nbsp;Surendra Shrestha,&nbsp;Susan Cook-Patton,&nbsp;Natalia Hasler,&nbsp;Drew E. Terasaki Hart,&nbsp;Samantha Yeo","doi":"10.1029/2025JG009284","DOIUrl":"https://doi.org/10.1029/2025JG009284","url":null,"abstract":"<p>Reforestation is a leading climate solution for removing carbon dioxide from the atmosphere, but generally decreases surface albedo, which diminishes its climate mitigation value. Knowing how quickly this albedo effect unfolds relative to carbon removal is critical for planning climate mitigation actions, yet the temporal changes in albedo are poorly described. This study uses satellite observations to characterize temporal changes in albedo with stand development for different forest types and ecoclimatic settings around the world. We find that about half of the climate warming effect from decreased albedo occurs within 40 years, but that it takes anywhere from 50 to 120 years to reach 80% of the full effect. The slowest declines occur in extra-tropical regions and broadleaf forests and woody savannas. The fastest declines occur in tropical environments, and for needleleaf or mixed broadleaf-needleleaf forests. Results were recast as a global map to help inform reforestation practitioners about the time it takes for reforestation's albedo-driven warming to approach its maximum effect.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"131 9","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JG009284","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mixo-COBALT: Incorporating Plastic Mixotrophy Into a Coupled Biogeochemical Ocean Model in the Sargasso Sea","authors":"Alan D. Sheu,&nbsp;Jessica Y. Luo,&nbsp;Kevin M. Archibald,&nbsp;Holly V. Moeller","doi":"10.1029/2026JG009780","DOIUrl":"https://doi.org/10.1029/2026JG009780","url":null,"abstract":"<p>Mixotrophic plankton incorporate both autotrophy (via photosynthesis) and heterotrophy (via phagotrophic grazing) into their metabolism. A large portion of marine protists are likely mixotrophic, significantly contributing to bacterivory and regulating biogeochemical cycling. Constitutive mixotrophs that produce their own plastids are often phenotypically plastic, varying their relative investments in photosynthesis and grazing depending on environmental conditions. However, plastic mixotrophs have yet to be implemented into a large-scale coupled ocean model. Thus, we incorporated an <i>Ochromonas</i>-like constitutive mixotroph into the COBALT biogeochemical model, focusing on a 1-dimensional water column in the Sargasso Sea as a basis for inquiry. We found that light was the primary driver of acclimation, with a preference for photosynthesis in the euphotic zone and vice versa in the aphotic zone prior to mixing. A 3-fold increase in bacterivory resulting from mixotrophy accelerated the microbial loop, shifting biomass to higher trophic levels and increasing carbon export by more than 20%. Overall, our results demonstrate the importance of including mixotrophs in biogeochemical models for their important role in shaping food-web dynamics and the biological carbon pump. Though we found the effects of plasticity to be somewhat subtle in our 1D model, our methods provide a computational tractable way to implement phenotypic plasticity and optimization on a global scale. We expect future work to expand the domain and types of mixotrophy in ocean models and to explore stoichiometric synergies between dual metabolic strategies.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"131 9","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Modular, Field-Ready System for Measuring In Situ Depth-Resolved Soil Dissolved Oxygen Time Series","authors":"Peter Regier,&nbsp;Stephanie Wilson,&nbsp;Roy Rich,&nbsp;Lydia LaGorga,&nbsp;Vanessa Bailey,&nbsp;Kennedy O. Doro,&nbsp;Kaizad F. Patel,&nbsp;Kenton A. Rod,&nbsp;Nicholas D. Ward","doi":"10.1029/2026JG009740","DOIUrl":"https://doi.org/10.1029/2026JG009740","url":null,"abstract":"<p>Oxygen plays a central role in regulating biogeochemical processes across terrestrial and aquatic ecosystems. However, its dynamics in hydrologically and redox-dynamic ecosystems remain poorly characterized due to high spatiotemporal variability and the lack of field-ready instrumentation capable of long-term, depth-resolved deployments required to capture these dynamics. Here, we present a practical, modular system for measuring high-frequency in situ dissolved oxygen time series across multiple soil depths in both unsaturated and saturated conditions. The platform integrates commercially available optical oxygen sensors with a portable logging and power system housed in a weatherproof enclosure. This system is cost-effective and designed for rapid assembly, flexible deployment, and robust operation under harsh field conditions. We demonstrate system performance across contrasting environmental settings, including an experimental flooding event in an upland forest and king tide-driven inundation in a coastal marsh, capturing rapid transitions between oxic and anoxic states and revealing depth-dependent oxygen dynamics. To support broader adoption, we provide open-source code for data processing and visualization, and outline pathways for future development, including integration with commercial dataloggers. By lowering technical and logistical barriers to depth-resolved in situ soil oxygen monitoring, this approach facilitates improved characterization of short-term oxygen dynamics and associated biogeochemical processes across a wide range of fundamental and applied research settings.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"131 9","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Climatic Constraints and Thermal Adjustment Shape the Apparent Response of Ecosystem Photosynthetic Optimum Temperature to Growth Temperature","authors":"Zichang He,&nbsp;Dan Zhu","doi":"10.1029/2026JG009923","DOIUrl":"https://doi.org/10.1029/2026JG009923","url":null,"abstract":"&lt;p&gt;The apparent optimum air temperature at which ecosystem gross primary productivity (GPP) peaks (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msubsup&gt;\u0000 &lt;mi&gt;T&lt;/mi&gt;\u0000 &lt;mtext&gt;opt&lt;/mtext&gt;\u0000 &lt;mtext&gt;eco&lt;/mtext&gt;\u0000 &lt;/msubsup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; ${T}_{text{opt}}^{text{eco}}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;) exhibits a globally observed positive correlation with local growth temperature, represented by growing-season-averaged daily maximum temperature (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msubsup&gt;\u0000 &lt;mi&gt;T&lt;/mi&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mtext&gt;gs&lt;/mtext&gt;\u0000 &lt;mspace&gt;&lt;/mspace&gt;\u0000 &lt;mi&gt;max&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;mtext&gt;air&lt;/mtext&gt;\u0000 &lt;/msubsup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; ${T}_{text{gs}hspace*{.5em}max }^{text{air}}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;). Despite recognition of this spatial covariation, the drivers underlying this &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msubsup&gt;\u0000 &lt;mi&gt;T&lt;/mi&gt;\u0000 &lt;mtext&gt;opt&lt;/mtext&gt;\u0000 &lt;mtext&gt;eco&lt;/mtext&gt;\u0000 &lt;/msubsup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; ${T}_{text{opt}}^{text{eco}}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; variability remain unclear. Combining in situ and satellite-derived GPP measurements, we find that growth temperature is a stronger large-scale correlate of &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msubsup&gt;\u0000 &lt;mi&gt;T&lt;/mi&gt;\u0000 &lt;mtext&gt;opt&lt;/mtext&gt;\u0000 &lt;mtext&gt;eco&lt;/mtext&gt;\u0000 &lt;/msubsup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; ${T}_{text{opt}}^{text{eco}}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; than plant functional type (PFT) identity, while the magnitude of the &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msubsup&gt;\u0000 &lt;mi&gt;T&lt;/mi&gt;\u0000 &lt;mtext&gt;opt&lt;/mtext&gt;\u0000 &lt;mtext&gt;eco&lt;/mtext&gt;\u0000 &lt;/msubsup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; ${T}_{text{opt}}^{text{eco}}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;-to-&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msubsup&gt;\u0000 &lt;mi&gt;T&lt;/mi&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mtext&gt;gs&lt;/mtext&gt;\u0000 &lt;mspace&gt;&lt;/mspace&gt;\u0000 &lt;mi&gt;max&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;mtext&gt;air&lt;/mtext&gt;\u0000 &lt;/msubsup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; ${T}_{text{gs}hspace*{.5em}max }^{text{air}}$&lt;/annotation&gt;\u0000 ","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"131 9","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Volatile Organic Compounds in Rainwater: A New Frontier in Atmosphere–Biosphere Interactions","authors":"Ana M. Yáñez-Serrano,&nbsp;Teresa Moreno,&nbsp;Maria Izquierdo,&nbsp;Jorge Pey,&nbsp;Roger Seco,&nbsp;Andrés Alastuey,&nbsp;Josep Peñuelas","doi":"10.1029/2026JG009767","DOIUrl":"https://doi.org/10.1029/2026JG009767","url":null,"abstract":"<p>Rainwater is a key vector of atmospheric deposition, linking the atmosphere with terrestrial and aquatic ecosystems. While the inorganic chemistry of precipitation (dominated by sulfate, nitrate, ammonium, and trace metals) has been extensively studied, organic compounds in rainwater have received less attention, and Volatile Organic Compounds (VOCs) in particular have been practically overlooked. Recent methodological advances have revealed that a diverse suite of VOCs can be detected in rainwater along with VOC-derived compounds, challenging the long-held assumption that wet deposition plays a negligible role in VOC cycling. Although wet deposition is generally thought to be a minor atmospheric sink for VOCs (∼13.3% of total VOC emissions), rainborne VOCs are chemically reactive and biologically labile, such that even small quantities may exert disproportionate effects on soil microbial activity, plants, short-term biogeochemical cycling, and water chemistry at local to regional scales. This article combines a synthesis of the current state of knowledge on rainborne VOCs and VOCs-derived compounds with a particular focus on VOC occurrence, sources, partitioning, and transformation processes, with a forward-looking perspective on the potential significance of rainborne VOCs for carbon cycling and atmosphere–biosphere interactions. We identify major gaps in observations, analytical capability, and modeling frameworks that limit quantitative understanding of VOC wet deposition and its ecological significance. Finally, we outline priority research directions, including improved sampling strategies, advanced analytical techniques, and integration into Earth system models. Together, these advances are needed to reassess the role of precipitation not only as a passive sink for atmospheric pollutants, but as an active driver of ecosystem functioning and Earth system processes in a changing climate.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"131 9","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026JG009767","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coral Origin of “Bacterial” Monoalkyl Glycerol Ethers (MAGEs)","authors":"Jingru Gao,&nbsp;Shengyi Mao,&nbsp;Xiyang Zhang,&nbsp;Fei Tan,&nbsp;Hongqiang Yang,&nbsp;Yuhang Tian,&nbsp;Xiaowei Zhu,&nbsp;Wen Yan","doi":"10.1029/2026JG009754","DOIUrl":"https://doi.org/10.1029/2026JG009754","url":null,"abstract":"<p>Monoalkyl glycerol ethers (MAGEs) are a suite of structurally stable lipid compounds ubiquitous in both biological and geological bodies; they are thought to derive mainly from bacteria such as sulfate-reducing bacteria, but animal lipids such as monoalkyldiacylglycerols (MADAGs) are also raised as an important contributor. Thus, MAGEs in marine realms may originate from marine bacteria or animals or both, which in turn, complicate definite interpretations on their source recognition. Scleractinian corals, a distinctive type of shallow-marine invertebrates thriving symbiotically with algae and bacteria, act as an ideal archive for assessing the animal and/or bacterial production of MAGEs. Here, 11 coral species randomly collected from tropical-subtropical offshore reefs in the South China Sea were measured for molecular and δ¹³C compositions of MAGEs alongside symbiotic bacterial communities residing within host corals. The lipidomic and genomic analyses unveil that tissual MAGEs are mainly hydrolyzed from coral polyp MADAGs (and analogs); by contrast, skeletal MAGEs are sourced from outer tissues and/or other unknown producers/precursors, which vary by coral species. A roughly negative correlation between content and δ¹³C of tissual MAGEs is observed. This phenomenon is attributed to a crucial role of light in driving symbiotic algal photosynthesis in offshore oligotrophic reefs, such that more ¹²C-depleted low-molecular precursors are preferentially incorporated into the biosynthesis of abundant MADAGs (and analogs) by coral host. Our findings signify that temporal profiles of MAGEs extracted from fossil coral skeletal sequences of certain species may offer a novel invaluable tool for high-resolution reconstruction of past eco-environmental changes in coral-algal-bacterial symbioses.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"131 9","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}