Journal of Geophysical Research: Biogeosciences最新文献

{"title":"Measuring Gas Transfer Velocity in a Steep Tropical Stream: Method Evaluation and Implications for Upscaling","authors":"Adam T. Rexroade,&nbsp;Marcus B. Wallin,&nbsp;Clément Duvert","doi":"10.1029/2024JG008420","DOIUrl":"https://doi.org/10.1029/2024JG008420","url":null,"abstract":"<p>Greenhouse gas emission estimates from streams rely, in part, on accurate measurements or estimates of the gas transfer velocity, which describes the physical efficiency for gas exchange across the water-air interface. Numerous methods for measuring or modeling gas transfer velocity exist, yet few studies compare these different methods. Additionally, current models of gas transfer velocity in streams are predominantly derived from measurements in low-gradient, temperate, or boreal streams. Here, we measured gas transfer velocity using four different methods in a high-energy, tropical headwater stream under a range of flow conditions, and compared these measurements to indirect estimates from four empirical models. Our results show that, when compared to the use of a biologically inert gas tracer (propane), floating chambers produced lower gas transfer velocity values. Using carbon dioxide (CO₂) as a tracer gas was unreliable without considering other natural sources and sinks of CO₂ and yielded gas transfer velocities lower than when using propane. Existing empirical models tended to underestimate gas transfer velocity, compared to the inert tracer gas. When using empirical models to upscale the emission flux along an entire stream reach, choice of model was more influential than the spatial resolution of model implementation. We also highlight the extreme spatial variability of gas transfer velocity across small spatial scales, which contrasts with its relative stability across changing hydrological conditions. The discrepancies between methods highlight the need for further research in measuring and upscaling gas transfer velocity, particularly in very turbulent steep streams.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 2","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JG008420","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143396903","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":"Variability and Controls of pCO2 and Air-Water CO2 Fluxes in a Temperate River","authors":"Fischer L. Young,&nbsp;Benjamin P. Colman,&nbsp;Alice M. Carter,&nbsp;Rafael Fiejó de Lima,&nbsp;Qipei Shangguan,&nbsp;Robert A. Payn,&nbsp;Michael D. DeGrandpre","doi":"10.1029/2024JG008434","DOIUrl":"https://doi.org/10.1029/2024JG008434","url":null,"abstract":"<p>Measurements of riverine dissolved inorganic carbon, total alkalinity (A_T), pH, and the partial pressure of carbon dioxide (<i>p</i>CO₂) can provide insights into the biogeochemical function of rivers, including the processes that control biological production, chemical speciation, and air-water CO₂ fluxes. The complexity created by these combined processes dictates that studies of inorganic carbon be made over broad spatial and temporal scales. Time-series data like these are relatively rare, however, because sampling and measurements are labor intensive and, for some variables, good measurement quality is difficult to achieve (e.g., pH). In this study, spectrophotometric pH and A_T were quantified with high precision and accuracy at biweekly to monthly intervals over a four-year period (2018–2021) along 216 km of the Upper Clark Fork River (UCFR) in the northern Rocky Mountains, USA. We use these and other time-series data to provide insights into the processes that control river inorganic carbon, with a focus on <i>p</i>CO₂ and air-water CO₂ fluxes. We found that seasonal snowmelt runoff increased <i>p</i>CO₂ and that expected increase and decrease of <i>p</i>CO₂ due to seasonal heating and cooling were likely offset by an increase and loss of algal biomass, respectively. Overall, the UCFR was a small net source (0.08 ± 0.14 mol m⁻² d⁻¹) of CO₂ to the atmosphere over the four-year study period with highly variable annual averages (0.0–0.10 mol m⁻² d⁻¹). The seasonally correlated, offsetting mechanisms highlight the challenges in predicting <i>p</i>CO₂ and air-water CO₂ fluxes in rivers.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 2","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JG008434","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143389223","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":"Blue Carbon Mapping Using Temporally Optimized Satellite Remote Sensing Imagery: A Regional Study of Northeast US Salt Marshes","authors":"Wenxiu Teng,&nbsp;Qian Yu,&nbsp;Brian Yellen,&nbsp;Bonnie Turek,&nbsp;Jonathan D. Woodruff","doi":"10.1029/2024JG008254","DOIUrl":"https://doi.org/10.1029/2024JG008254","url":null,"abstract":"<p>Coastal wetlands store three to five times more carbon per unit area than tropical rainforests in continually accreting peat soils, collectively referred to as “Blue Carbon.” However, variability in soil carbon density within and between sites leads to large uncertainty when estimating carbon stocks and sequestration rates. Salt marsh carbon sequestration is mainly driven by nonlinear ecogeomorphic feedback between tidal inundation, bioproductivity, and sediment supply—all of which can be observed by satellites. In this study, we used soil bulk density and soil organic content from 410 soil samples collected across 15 sites in the Northeast US to relate soil properties to remotely sensed spectral observations. We tested model fits using Landsat 5, 7, 8, and Sentinel 2 images from 1984 to 2022 to determine the optimal season and tidal conditions for relating remote sensing indices to soil properties. We explored the roles of sediment supply and tidal range in regional prediction models. The study found that (a) spatial patterns of remote sensing indices correlate well with soil properties; (b) at the marsh scale, remote sensing indices capture the spatial variability of soil properties with image acquired at high tide and vegetation phenology specific to geomorphic setting; (c) at the regional scale, tidal range improves the prediction model in barrier marshes, while sediment supply improves the prediction model in fluvial marshes. The considerable spatial variation of SOC within marshes and across regional gradients highlights the need for high resolution maps of salt marsh soil properties.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 2","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143389039","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":"Diverse Altitudinal Patterns and Drivers of Greenhouse Gas Dynamics in Southwest China Alpine Streams and Rivers","authors":"Ying Wang,&nbsp;Yuhao Li,&nbsp;Genxu Wang,&nbsp;Yang Li,&nbsp;Xiangyang Sun,&nbsp;Wenzhi Wang,&nbsp;Chunlin Song","doi":"10.1029/2024JG008458","DOIUrl":"https://doi.org/10.1029/2024JG008458","url":null,"abstract":"<p>Streams and rivers are globally significant sources of greenhouse gases (GHGs) to the atmosphere. However, GHG evasion from mountain streams remains poorly constrained due to scarce data. In this study, we measured concentrations and estimated fluxes of riverine carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O) across three alpine catchments in Southwest China. GHG concentrations in these turbulent streams and rivers are slightly oversaturated but much lower than the global average, likely due to high gas transfer velocities that rapidly deplete GHGs. Headwater streams (first-order) exhibited higher gas evasion rates than large rivers (fourth-order), despite having lower CO₂ and N₂O concentrations. The partial pressure of CO₂ and dissolved N₂O concentrations decreased linearly with elevation, likely linked to the altitudinal patterns of forest cover and groundwater table depth. Dissolved CH₄ concentrations and the three GHGs fluxes showed weak relationships with elevation. We observed significant seasonal differences in GHG fluxes, with higher evasion rates during the wet season. The seasonal and spatial heterogeneity in stream GHG concentrations and fluxes was primarily controlled by hydrology, climate, and geomorphology. Our analyses also revealed that GHG fluxes were positively correlated with stream water temperature, velocity, and channel slope. This study demonstrates that these alpine streams are underestimated net sources of GHGs, particularly CO₂ and N₂O, highlighting the importance of mountain headwater systems in regional and global GHG budgets. The diverse altitudinal patterns of GHG dynamics also suggest complex controls of GHG in alpine streams and rivers.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 2","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380762","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":"Elevated Atmospheric Sulfur Deposition Affects Predominant Forms of Sulfur in Ombrotrophic Peatlands","authors":"Hongyan Wang,&nbsp;Zhi-Guo Yu,&nbsp;Tanja Broder,&nbsp;Jörg Göttlicher,&nbsp;Ralph Steininger,&nbsp;Sindy Wagner,&nbsp;Harald Biester,&nbsp;Klaus-Holger Knorr","doi":"10.1029/2024JG008563","DOIUrl":"https://doi.org/10.1029/2024JG008563","url":null,"abstract":"<p>Long-term transformations of sulfur from atmospheric deposition in ombrotrophic peatlands have rarely been studied, although the potential impact on carbon mineralization and particularly methane formation is acknowledged. To elucidate the long-term fate of sulfur in peat, we therefore applied sulfur K-edge X-ray absorption near-edge structure (XANES) spectroscopy to investigate peatlands with either natural or anthropogenic atmospheric sulfur deposition. A peatland in central Europe (Germany, BBM) experienced high sulfur deposition during the Industrial Revolution, and an oceanic peatland (Chilean Patagonia, PBr) continuously exposed to aerosols from sea spray, were investigated. During early phases of site BBM, when sulfur deposition was constantly low, wet-chemical extractions indicated that 98% ± 0.7% of sulfur was present as organic sulfur. The S K-edge XANES fitting suggested that sulfur redox transformations mainly occurred near the water table, at which reduced sulfur forms (primarily organic sulfides, and thiols) increased from ∼40% to and stabilized at 65% ± 4% in anoxic peat. An increased contribution of reduced sulfur forms was observed in the polluted section of BBM and entire peat profile of PBr. While increases in reduced inorganic sulfur (TRIS) likely depended on available Fe, rises in the ratio of reduced organic sulfur to total organic sulfur from both sites were pronounced. This increase in reduced organic sulfur forms likely resulted from abiotic sulphurization of organic carbon after sulfate reduction. Our study highlights the long-term fate of elevated sulfur in ombrotrophic peatlands, being mainly transformed into reduced organic sulfur.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 2","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380075","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":"Impact of Diagenesis on Biogenic Silica- Structural, Chemical, and Isotope Proxies","authors":"Franziska M. Stamm,&nbsp;Rebecca A. Pickering,&nbsp;Patrick J. Frings,&nbsp;Daniel A. Frick,&nbsp;Sylvain Richoz,&nbsp;Daniel J. Conley","doi":"10.1029/2024JG008160","DOIUrl":"https://doi.org/10.1029/2024JG008160","url":null,"abstract":"<p>The silicon isotope composition (δ³⁰Si) of biogenic silica is often used as an archive of past environmental conditions. For example, sponge spicule δ³⁰Si is known to be related to seawater-dissolved Si concentrations. Such a proxy application requires that the δ³⁰Si is not diagenetically altered—or at least that any alteration can be identified and accounted for. Yet the preservation of pristine isotope signals during (early) diagenesis is challenged by observations of structural changes to the amorphous silica (opal-A) of biogenic silica toward a more stable amorphous silica phase (opal-CT). This transformation is known to be associated with a resetting of oxygen isotope (δ¹⁸O) values but with unclear implications for the preservation of other geochemical signatures. This was investigated using modern and Cretaceous siliceous sponge spicules. Modern spicules collected from different ocean basins were uniformly transparent opal-A, whereas Cretaceous spicules exhibited two preservation states: visually similar to modern or clearly altered toward a milky, translucent composition. A comparison of δ³⁰Si and δ¹⁸O values of spicules from both categories within single samples reveals the milky, translucent individuals are offset from the transparent individuals and thus presumably unsuitable for palaeoenvironmental applications. A suite of geochemical and structural analyses (XRD, Raman spectroscopy, and FT-IR spectroscopy) demonstrate that even visually clear Cretaceous spicules are subtly different from their modern counterparts, implying caution is required when interpreting δ³⁰Si values or other geochemical proxies in ancient biogenic silica.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 2","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JG008160","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143186378","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":"Deciphering Microbially Driven Labile and Refractory Molecular Candidates in Dissolved Organic Matter","authors":"Qi Chen,&nbsp;Jiaxin Chen,&nbsp;Ruanhong Cai,&nbsp;Chen He,&nbsp;Quan Shi,&nbsp;Chuanlun Zhang,&nbsp;Nianzhi Jiao,&nbsp;Qiang Zheng","doi":"10.1029/2024JG008484","DOIUrl":"https://doi.org/10.1029/2024JG008484","url":null,"abstract":"<p>Microbial activities drive the cycling of dissolved organic matter (DOM) from labile to refractory states, thus contributing to the long-term carbon sequestration in the ocean. However, due to the intricate molecular composition of DOM, identifying indicators of microbially related DOM remains a challenge. In this study, we propose molecular candidates for bio-labile (<i>n</i> = 537) and bio-refractory (<i>n</i> = 1,025) formulas, which were discerned through incubation experiments using ultrahigh-resolution mass spectrometry. Bio-labile formulas exhibited greater hydrogenation, whereas bio-refractory formulas comprised oxidized, unsaturated and aromatic molecules with higher molecular weight. Bio-candidates, in contrast to photo- or terrestrial-related counterparts, dominated molecular composition by higher relative intensity. The application of these molecular candidates facilitated the tracing of molecular distribution and transformation patterns across large-scale aquatic environmental gradients. This molecular identification framework offers insights into resolving microbially mediated molecules and advancing our understanding of biologically related DOM at the molecular level.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 2","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143186377","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":"Seasonal Effects of Soil Temperature and Soil Water Content on Upscaled Soil Respiration and Its Contribution to Ecosystem Respiration in Chaparral Shrublands","authors":"J. A. Montes,&nbsp;K. Lunneberg,&nbsp;M. N. Montemayor,&nbsp;B. M. Gillespie,&nbsp;W. C. Oechel","doi":"10.1029/2023JG007985","DOIUrl":"https://doi.org/10.1029/2023JG007985","url":null,"abstract":"<p>Chaparral, a semi-arid Mediterranean plant community, has the potential to act as a sink, which is an essential ecosystem to mitigate climate change. However, soil respiration (Rs) responses to meteorological variables remain uncertain in these regions, and no studies have quantified how much Rs attributes to Reco in chaparral shrublands. This study identifies the effects of soil temperature (Ts) and soil water content (SWC) on upscaled Rs and its contribution to Reco (Rs/Reco) in chaparral shrublands in Southern California between 2020 and 2021. Hourly Rs and net ecosystem exchange (NEE) were collected by automated chambers and the eddy covariance technique, respectively. Due to high daily variability and gaps in our data, 5-day averages were calculated to understand the effects of meteorological on Rs and Rs/Reco. First, we proposed that SWC was the primary driver of Rs regardless of the season, while Ts effects were prominent when SWC was sufficient. Secondly, we hypothesized Rs/Reco to vary seasonally, particularly due to Rs contributing less under dry conditions. Our results showed SWC to have a strong significant effect on Rs throughout the year, whereas Ts was only a significant control when the soil was wet and Ts was below 20°C. Monthly Rs/Reco was highest during January and February, likely due to the reduced aboveground respiration. While Rs/Reco was lowest when the soil was the driest. These findings improve our understanding of Rs response to climatic conditions and emphasize the importance of estimating Rs/Reco in chaparral shrublands.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 2","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JG007985","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143186418","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":"Machine Learning Reveals the Contrasting Roles of Rainfall and Canopy Structure Metrics on the Formation of Canopy Drip and Splash Throughfall","authors":"Kazuki Nanko,&nbsp;Delphis F. Levia,&nbsp;Shin'ichi Iida,&nbsp;Yoshinori Shinohara,&nbsp;Naoki Sakai","doi":"10.1029/2024JG008340","DOIUrl":"https://doi.org/10.1029/2024JG008340","url":null,"abstract":"<p>Throughfall is a significant majority of the total precipitation reaching the ground in forested areas. This study revealed biotic and abiotic factors influencing the throughfall generation process, with the throughfall partitioning into free throughfall, splash throughfall, and canopy drip created at foliar surface drip points (FSDPs) and occasional woody surface drip points (O-WSDPs), utilizing machine learning. Using a large-scale rainfall simulator, throughfall drops were simultaneously measured at 19 locations under a mix of deciduous and coniferous tree species in both foliated and unfoliated states. Random forest modeling showed that biotic factors, such as foliage amount, primarily affected the development and volume fraction of canopy drip in foliated trees. In contrast, for unfoliated trees, canopy drip volume fraction was mainly influenced by abiotic factors, including drop size and kinetic energy of open rainfall. The formation and volume fraction of splash throughfall were primarily influenced by abiotic factors for both foliated and unfoliated trees. From the comparison between the foliated and unfoliated states, the generation process of canopy drip was separately clarified between FSDPs and O-WSDPs. More and larger canopy drip was generated by more foliage with a more wetted canopy with less fluctuation at the FSDPs, whereas a less wetted canopy and/or higher drop impact energy generated more and larger canopy drip at O-WSDPs. This study underscores the importance of canopy structure and meteorological conditions in determining throughfall partitioning. The findings contribute to a nuanced understanding of rainwater redistribution in forest ecosystems.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 2","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143111532","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":"Exploring the Significance of Chlorophyll Fluorescence-Based Photosynthetic Capacity in Gross Primary Productivity Simulations Across Diverse Ecosystems in China","authors":"Muhammad Amir,&nbsp;Bin Chen,&nbsp;Jinghua Chen,&nbsp;Shaoqiang Wang,&nbsp;Kai Zhu,&nbsp;Shiliang Chen,&nbsp;Ye Xia","doi":"10.1029/2023JG007889","DOIUrl":"https://doi.org/10.1029/2023JG007889","url":null,"abstract":"<p>Accurate estimation of gross primary productivity (GPP) plays a critical role in developing effective climate change policies. In addition to climatic factors, CO₂ levels, and leaf area index (LAI), GPP is also primarily regulated by the maximum rate of carboxylation (<i>V</i>_cmax) in ecosystem models. However, significant uncertainties in <i>V</i>_cmax measurements, along with its limited availability over larger geographical areas, hinder our ability to address scientific questions in context of increasing atmospheric CO₂ concentrations. Recently, solar-induced fluorescence (SIF) signals have been used as non-invasive way to monitor plant physiological processes. In this study, we utilized eddy covariance-based GPP and the Soil-Canopy Observation of Photosynthesis and Energy (SCOPE) model to infer <i>V</i>_cmax. We aimed to establish relationships between site-scale <i>V</i>_cmax and far-red solar-induced chlorophyll fluorescence yield (SIF_yield) to estimate photosynthetic capacity across diverse ecosystems in China from 2008 to 2010. Our findings revealed a robust relationship between SIF_yield and site-level <i>V</i>_cmax retrievals, with a coefficient of determination (<i>R</i>²) ranging from 0.36 to 0.74 (<i>p</i> &lt; 0.05) at biweekly (once every two weeks) intervals across all studied sites. Incorporating SIF_yield-derived <i>V</i>_cmax into the SCOPE model resulted in a 9% improvement in GPP simulation accuracy compare to using a constant <i>V</i>_cmax. Additionally, integration SIF_yield-derived <i>V</i>_cmax into the BEPS (Boreal Ecosystem Productivity Simulator) model demonstrated strong agreement between flux-based and simulated GPP values, further validating the accuracy of the estimated <i>V</i>_cmax in capturing ecosystem photosynthetic capacity. This study highlights the importance of utilizing SIF_yield to precisely quantify GPP estimates in the context of imminent climate change challenges.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 2","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143110762","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}