Journal of Geophysical Research: Biogeosciences最新文献

{"title":"Cold Seeps and Coral Reefs in Northern Norway: Carbon Cycling in Marine Ecosystems With Coexisting Features","authors":"Muhammed Fatih Sert,&nbsp;Hans C. Bernstein,&nbsp;Knut Ola Dølven,&nbsp;Sebastian Petters,&nbsp;Timo Kekäläinen,&nbsp;Janne Jänis,&nbsp;Jorge Corrales-Guerrero,&nbsp;Bénédicte Ferré","doi":"10.1029/2024JG008475","DOIUrl":"https://doi.org/10.1029/2024JG008475","url":null,"abstract":"<p>Cold seeps and cold-water corals (CWCs) coexist on Northern Norway's continental shelf at the Hola trough between Lofoten and Vesterålen. Here, cold seeps release methane from the seabed, yet none reaches the sea surface. Instead, the methane dissolves and disperses in the ocean where it is ultimately consumed by methane-oxidizing microorganisms. These microorganisms metabolize methane and release carbon dioxide and dissolved organic matter (DOM), which may impact the biogeochemical habitat of CWCs in close vicinity of cold seeps. We investigated the biogeochemistry of carbon, carbon isotopes, nutrients, DOM compositions, and microbial diversity in the water column. Our results indicated that dissolved inorganic carbon concentrations were 29% higher near cold seeps with modified carbon's isotopic compositions. The hydrophysical parameters and surface-to-bottom control of sinking particles mainly govern water column productivity and nutrient cycle. DOM compositions implied that the seep-associated microbiomes modify DOM's chemical diversity and isotopic composition at CWCs and the entire water column near cold seeps. Cold seeps and CWCs coexist in Northern Norway's continental shelves; however, enhanced water temperatures and consequent increase in methane release at cold seeps may modify the carbon cycling in the area, which could mitigate the ecological role and functioning of CWC reefs in the future.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143688934","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":"Improved Estimates of Regional Rice Yield Responses to Elevated CO2 by Considering Sub-Species Discrepancies","authors":"Songhan Wang,&nbsp;Kees Jan van Groenigen,&nbsp;Christoph Müller,&nbsp;Xuhui Wang,&nbsp;Lian Song,&nbsp;Yunlong Liu,&nbsp;Yu Jiang,&nbsp;Josep Peñuelas,&nbsp;Yanfeng Ding","doi":"10.1029/2024JG008438","DOIUrl":"https://doi.org/10.1029/2024JG008438","url":null,"abstract":"<p>Increased rice yields due to rising atmospheric carbon dioxide (CO₂), known as the CO₂ fertilization effect (CFE), is one of several important factors sustaining global food security. However, model projections on future rice yields are still largely uncertain, partly owing to the lack of how CFE varies between rice species. Here, through synthesis of hundreds of field observations, we found the experimental evidence of a 12.8 ± 0.8% yield increase per 100 ppm CO₂ increase for Indica, but only about a half for Japonica (6.3 ± 0.5 %). After accounting for differences in sub-species, crop model projections showed substantial regional discrepancies of CFE, which are not captured by original models. More importantly, the spatial and temporal variations of rice yield were projected more accurately after considering this sub-species difference. Together, these results suggest strong influences of genotype on rice yield responses to CO₂ and highlight the need for crop models to consider genotypes for improving projections of global crop yield.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143689041","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":"Investigation of the Global Influence of Surface Roughness on Space-Borne GNSS-R Observations","authors":"Mina Rahmani,&nbsp;Jamal Asgari,&nbsp;Milad Asgarimehr,&nbsp;Jens Wickert","doi":"10.1029/2024JG008243","DOIUrl":"https://doi.org/10.1029/2024JG008243","url":null,"abstract":"<p>Accurately characterizing the impact of vegetation and roughness on CYGNSS observations, which are two main sources of disturbance, is essential for achieving high-quality estimates of soil moisture through this mission. While there are several ancillary data sets that can be employed to address vegetation influence, the lack of a global data set for soil surface roughness motivates us to globally map the contribution of soil roughness to CYGNSS observations. To accomplish this, since separating the contribution of surface roughness and vegetation on reflected signals is often challenging, we initially integrate the vegetation and roughness contributions into a unique variable, denoted as VR. Next, the impacts of vegetation integrated into the CYGNSS-derived VR were separated using Leaf Area Index to map the roughness parameter Hr. The mean value of Hr obtained in this research through CYGNSS observations ranges from 3.2 to 4.6. We observed that the spatial distribution of Hr values is influenced by the predominant vegetation types, with forests exhibiting higher roughness values (Hr = 4.47–4.67), while deserts, shrubs, crops, and bare soils exhibit the smallest Hr values (Hr = 3.25–3.36). Furthermore, we inferred vegetation optical depth (VOD) through CYGNSS observations in conjunction with estimated Hr values. The good agreement observed between the estimated VOD in this study and other vegetation indices, including Vegetation Water Content and tree height, highlights the effectiveness of the introduced Hr global data set in our research and its promising potential in the future GNSS-R studies.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645727","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":"Impacts of Physical Mixing Combined With Biological Activity on Spatiotemporal Evolution of CO2 Uptake Within the Plume Discharged From the Changjiang River in the Summer of 2016","authors":"Daehyuk Kim,&nbsp;So-Young Kang,&nbsp;Jae-Hong Moon,&nbsp;Hyun-Chae Jung,&nbsp;Subin Kim","doi":"10.1029/2024JG008545","DOIUrl":"https://doi.org/10.1029/2024JG008545","url":null,"abstract":"<p>Understanding carbon dynamics in the river-dominated marginal seas remains challenging due to limited temporal and spatial in situ measurements and complexities of coupled physical-biogeochemical systems. In this study, a coupled physical-biogeochemistry regional ocean model was used to investigate the underlying drivers of the spatiotemporal evolution of oceanic CO₂ uptake within the Changjiang River Plume (CRP) during the summer of 2016. Three comparative experiments were conducted to quantify the contribution of physical and biological processes and air–sea gas exchange within the CRP. In the estuary, strong turbulent mixing due to tides largely inhibited biological production despite being supplied with a high concentration of riverine nutrients, making this area a vigorous source of atmospheric CO₂. On the other hand, phytoplankton growth was rapidly promoted by weakened turbulent mixing on the nearshore slope, leading to the strongest drawdown in the partial pressure of CO₂ (<i>p</i>CO₂) due to biological processes. In the offshore region, the air–sea CO₂ exchange contributed to increasing <i>p</i>CO₂ (approximately 10%), which finally altered the offshore water to a weak CO₂ source into the atmosphere. An additional experiment without tides further demonstrated that strong fluctuations in turbulent mixing in the nearshore slope modulate surface flows with a spring-neap cycle of stratification and destratification, resulting in the formation of an elongated chlorophyll front and its periodically undulating behavior of extending seaward or retreating shoreward. Our findings highlight the deep impacts of tidal modulation combined with biological activities on spatiotemporally evolving biogeochemical responses in river-dominated marginal seas.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143646261","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":"Mudflat Biostabilization Alters Coastal Landscape Sediment Connectivity","authors":"K. Valentine,&nbsp;M. L. Kirwan","doi":"10.1029/2024JG008500","DOIUrl":"https://doi.org/10.1029/2024JG008500","url":null,"abstract":"<p>Connectivity between adjacent ecosystems is thought to increase ecosystem resilience and function. In coastal ecosystems, the exchange of sediment and nutrients between mudflats and marshes is important for the long-term dynamics of both systems. Mudflat morphodynamics are driven by the interaction of waves and sediment erodibility, which is a function of sediment type and the presence of biostabilizers such as microphytobenthos. However, there is a poor understanding about how the evolution of mudflats may impact the morphodynamics and function of adjacent salt marshes. Here, we use a Coastal Landscape Transect model connecting mudflats and marshes to investigate how microphytobenthos influence the coupled behavior of mudflats and marshes, and how that coupled behavior influences carbon storage. We find that biofilms reduce the connectivity between mudflats and marshes by reducing erodibility and sediment exchange. Reduced connectivity associated with microphytobenthos leads to a shallower mudflat and more carbon stored in the mudflat sediments, which in turn cascades to a higher combined marsh and mudflat carbon stock. Furthermore, our results highlight the role of connectivity across the coastal landscape and suggest that biostabilization leads to relatively small changes in morphodynamics but relatively large changes in ecosystem function.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632687","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":"Nitrogen Cycling Through Secondary Succession in a Northwestern Virginia Chronosequence","authors":"A. M. Parisien,&nbsp;H. E. Epstein","doi":"10.1029/2024JG008584","DOIUrl":"https://doi.org/10.1029/2024JG008584","url":null,"abstract":"<p>Forest clearing for agricultural use followed by cropland or pasture abandonment is a leading cause of forest disturbance. While theoretical models broadly predict the biogeochemical and structural dynamics of secondary forest succession following disturbances, much remains unknown regarding how specific components of biogeochemical cycling vary through secondary succession. Here we investigate two post-agricultural disturbance chronosequences at Blandy Experimental Farm in Boyce, VA, each consisting of an early, mid, and late successional field (∼20, ∼35, and ∼100 years old, respectively). We collected data observing a wide range of ecosystem N pools, transformations, and fluxes, including soil, litter, and foliar N; net N mineralization and nitrification; soil N leaching potential; and soil and foliar ¹⁵N natural abundance. We found that total soil N increased throughout secondary succession; while litter N concentration decreased in late succession, total litter mass increased, so total litter N increased as well. Foliar N concentration increased from early to late succession, among and within species. While soil ammonium concentration decreased through succession, soil nitrate concentration increased. Net N mineralization and nitrification both increased throughout succession, and a greater proportion of mineralized N was nitrified later in succession. Isotopic analysis suggested high N-fixation in mid-succession, and these observations taken together indicated high N availability and a relatively open N cycle later in succession in this system. Comprehensive field observations such as these are essential for honing a mechanistic understanding of successional systems and making predictions about the biogeochemical cycling and ecosystem function of current and future successional forests.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JG008584","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632689","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":"Honoring Our 2024 Reviewers: Advancing Excellence and Equity in JGR Biogeosciences","authors":"Xiaojuan Feng,&nbsp;Deborah Huntzinger,&nbsp;Ben Bond-Lamberty,&nbsp;Gil Bohrer,&nbsp;Marguerite A. Xenopoulos","doi":"10.1029/2025JG008871","DOIUrl":"https://doi.org/10.1029/2025JG008871","url":null,"abstract":"<p>Peer review is a critical evaluation process, one that is time-consuming but needed to maintain quality and credibility in science. At <i>JGR Biogeosciences</i> we are honoring the many 2024 reviewers who donated their time and expertise to ensure rigor, novelty, inclusiveness, and open practices for improving and advancing biogeosciences research.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JG008871","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143622521","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":"Pre-Fire Vegetation Conditions and Topography Shape Burn Mosaics of Siberian Tundra Fire Scars","authors":"N. Rietze,&nbsp;R. J. Heim,&nbsp;E. Troeva,&nbsp;G. Schaepman-Strub,&nbsp;J. J. Assmann","doi":"10.1029/2024JG008608","DOIUrl":"https://doi.org/10.1029/2024JG008608","url":null,"abstract":"<p>The fire season of 2020 in Siberia set a precedent for extreme wildfires in the Arctic tundra. Recent estimates indicated that the 2020 fires contributed 66% of the region's burned area over the last two decades. These fires burned in the carbon-rich permafrost landscape, releasing vast amounts of carbon, and changing land surface processes by burning vegetation and organic soils. However, little is known about the mosaics of burned and unburned patches formed by tundra fires and the underlying processes that generate them. In this study, we investigated six fire scars in the northeastern Siberian tundra using high-resolution PlanetScope imagery (3 m) to map burned fraction within the scars. We then used Bayesian mixed models to identify which biotic and abiotic predictors influenced the burned fraction. We observed high spatial variation in burned fraction across all tundra landforms common to the region. Current medium-resolution fire products could not capture this heterogeneity, thereby underestimating the burned area of fire scars by a factor of 1.2–4.7. The heterogeneity of the burn mosaic indicates a mix of burned and unburned patches, with median unburned patch sizes ranging between 189 and 288 m² per fire scar. Pre-fire land surface temperature, vegetation heterogeneity and topography predicted burned fraction in our analysis, matching factors previously shown to influence large-scale fire occurrence in the Arctic. Future studies need to consider the fine-scale heterogeneity within tundra landscapes to improve our understanding and predictions of fire spread, carbon emissions, post-fire recovery and ecosystem functioning.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JG008608","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143622522","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":"Atmospheric Vapor Pressure Deficit Outweighs Soil Moisture Deficit in Controlling Global Ecosystem Water Use Efficiency","authors":"Chao Li,&nbsp;Dahong Zhang,&nbsp;Shiqiang Zhang,&nbsp;Yanan Wen,&nbsp;Wenhui Wang,&nbsp;Youdong Chen,&nbsp;Jian Peng","doi":"10.1029/2024JG008605","DOIUrl":"https://doi.org/10.1029/2024JG008605","url":null,"abstract":"<p>High vapor pressure deficit (VPD) and low soil moisture (SM) lead to soil and atmospheric droughts, which can stress carbon-water coupling in terrestrial ecosystems. However, the strong collinearity between VPD and SM, particularly under certain climatic conditions, makes it challenging to disentangle their independent contributions to carbon and water dynamics in land-atmosphere interactions. This study aimed to clarify the long-term independent response of global vegetation carbon-water coupling, based on ecosystem water-use efficiency (WUE_E) and plant canopy water-use efficiency (WUE_Et), to decoupled VPD and SM from 1982 to 2100. WUE_E is defined as the ratio of ecosystem gross primary productivity to evapotranspiration, while WUE_Et is defined as the ratio of ecosystem gross primary productivity to vegetation transpiration. The results indicate that from 1982 to 2018, both before and after the decoupling of VPD and SM, over 64% of global vegetation zones experienced stronger atmospheric moisture stress from VPD than soil drought stress from SM, consistently impacting WUE_E and WUE_Et. The influence of VPD on WUE_E and WUE_Et gradually declined, while the influence of SM presented a tendency to increase. The small difference in the responses of WUE_E and WUE_Et to VPD and SM is attributed to the strong collinearity between WUE_E and WUE_Et. The effects of VPD and SM on WUE_E and WUE_Et varied across vegetation cover gradients, biomes, and climatic zones. As atmospheric and soil drought intensifies in the coming decades, the effects of VPD on WUE_E and WUE_Et stress are stronger than those of SM across all four socio-economic shared pathway (SSP) scenarios. In the high SSP scenarios (SSP5-8.5 for WUE_E and SSP3-7.0 for WUE_Et), the dominant influence of VPD is expected to expand.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143595245","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":"Insights Into Nature-Based Climate Solutions: Managing Forests for Climate Resilience and Carbon Stability","authors":"Bailey A. Murphy,&nbsp;Christine R. Rollinson,&nbsp;Michael C. Dietze,&nbsp;Christina L. Staudhammer,&nbsp;Nicolena R. VonHedemann,&nbsp;Courtney A. Schultz,&nbsp;William J. Kleindl,&nbsp;Ankur R. Desai","doi":"10.1029/2024JG008391","DOIUrl":"https://doi.org/10.1029/2024JG008391","url":null,"abstract":"<p>Successful implementation of forest management as a nature-based climate solution is dependent on the durability of management-induced changes in forest carbon storage and sequestration. As forests face unprecedented stability risks in the face of ongoing climate change, much remains unknown regarding how management will impact forest stability, or how interactions with climate might shift the response of forests to management across spatiotemporal scales. Here, we used a process-based model to simulate multidecadal projections of forest dynamics in response to changes in management and climate. Simulations were conducted across gradients in forest type, edaphic factors, and management intensity under two alternate radiative forcing scenarios (RCP4.5 and RCP8.5). This allowed for the quantification of forest stability shifts in response to climate change, and the role of management in modulating that response, where ecosystem stability is characterized as the resilience and temporal stability of net primary production, aboveground biomass, and soil carbon. Our results indicate that forest structure is primarily shaped by management, but the same management strategy often produced divergent structures over time, due to interactions with regional climate change. We found that management can be used to increase stability and minimize the release of stored carbon by reducing mortality, but also highlight the regional dependency of management-induced changes in resilience to climate change.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JG008391","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143581507","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}