Journal of Geophysical Research: Biogeosciences最新文献

{"title":"Magnitude Shifts in Aeolian Sediment Transport Associated With Degradation and Restoration Thresholds in Drylands","authors":"Nicholas P. Webb,&nbsp;Brandi Wheeler,&nbsp;Brandon L. Edwards,&nbsp;Jeremy W. Schallner,&nbsp;Neeshia Macanowicz,&nbsp;Justin W. Van Zee,&nbsp;Ericha M. Courtright,&nbsp;Brad Cooper,&nbsp;Sarah E. McCord,&nbsp;Dawn Browning,&nbsp;Saroj Dhital,&nbsp;Kristina E. Young,&nbsp;Brandon T. Bestelmeyer","doi":"10.1029/2024JG008581","DOIUrl":"https://doi.org/10.1029/2024JG008581","url":null,"abstract":"<p>Vegetation change in drylands can influence wind erosion and sand and dust storms (SDS) with far-reaching consequences for Earth systems and society. Although vegetation is recognized as an important control on wind erosion and SDS, the interactions are not well described at the landscape level or in the context of dryland ecosystem change. The transition of sites from one ecological state to another (e.g., grassland to shrubland) is typically associated with changes in the composition, cover, and structure of vegetation, which influence drag partitioning and wind shear velocities that drive aeolian sediment transport. Here, we quantify the magnitude and direction of aeolian sediment transport responses to ecological state change in the northern Chihuahuan Desert and identify thresholds associated with state transitions. Our results show aeolian sediment mass flux (<i>Q</i>) increased from ∼1 to 10 g m⁻¹ d⁻¹ in historical grassland with scattered shrubs to ∼10–100 g m⁻¹ d⁻¹ following shrub invasion and decline in perennial grass cover to ∼100–10,000 g m⁻¹ d⁻¹ in shrubland following complete grass loss. The magnitude shifts were associated with critical perennial grass cover thresholds governing nonlinear increases in <i>Q</i> across ecological state transitions. Grass recovery in shrubland reduced <i>Q</i> to rates similar to those in historical grasslands—a multiple order of magnitude reduction. Our results show that crossing degradation and restoration thresholds between alternative ecological states can have a profound effect on the magnitude and spatiotemporal variability of aeolian sediment transport and primacy in determining patterns of wind erosion and dust emissions in vegetated drylands.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JG008581","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143564809","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":"High-Resolution Sensors Reveal Nitrate and Dissolved Silica Dynamics in an Arctic Fjord","authors":"Alexander D. Beaton,&nbsp;Katharine R. Hendry,&nbsp;Jade E. Hatton,&nbsp;Matthew D. Patey,&nbsp;Matthew Mowlem,&nbsp;Geraldine Clinton-Bailey,&nbsp;Patricia Lopez-Garcia,&nbsp;E. Malcolm S. Woodward,&nbsp;Lorenz Meire","doi":"10.1029/2024JG008523","DOIUrl":"https://doi.org/10.1029/2024JG008523","url":null,"abstract":"<p>Subglacial weathering releases biologically important nutrients into meltwaters that have the potential to influence downstream ecosystems. There is a need to understand how accelerated glacial retreat could impact biogeochemical cycling in coastal regions in the near future. However, fjords—important gateways connecting the Greenland ice sheet and coastal oceans—are highly heterogeneous environments both in space and time. Here, we investigate temporal variability of nutrient dynamics in a glacier-fed fjord (Nuup Kangerlua, Greenland) using a high resolution record of nitrate + nitrite (∑NO_x) and dissolved silica (DSi), coupled with temperature and salinity, using submersible in situ sensors. During a 3-month monitoring period (14th June to 13 September 2019), ∑NO_x varied between 0.05 and 10.07 μM (±0.2 μM), whereas DSi varied between 0.35 and 14.98 μM (±0.5 μM). Both nutrients started low (following the spring bloom) and increased throughout the monitoring period. Several large peaks in both nutrients were observed, and these can largely be associated with meltwater runoff and upwelling events. Peaks in DSi were likely the direct result of glacial meltwater pulses, whereas elevated ∑NO_x concentrations in the fjord system were likely the result of meltwater-induced upwelling of marine sources. However, we did not observe a case of simple conservative mixing, suggesting that other processes in the fjord system (e.g., differential biological uptake and remineralization) may decouple the relationship between the two nutrients. This data set was used to investigate the biogeochemical impact of changes in glacier meltwater input throughout the melt season.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JG008523","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533381","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":"Preferential Groundwater Discharges Along Stream Corridors Are Disregarded Sources of Greenhouse Gases","authors":"A. M. Bisson,&nbsp;F. Liu,&nbsp;E. M. Moore,&nbsp;M. A. Briggs,&nbsp;A. M. Helton","doi":"10.1029/2024JG008395","DOIUrl":"https://doi.org/10.1029/2024JG008395","url":null,"abstract":"<p>Groundwater delivery of greenhouse gases (GHGs) to stream banks and riparian areas, before mixing with surface waters, has not been well quantified. We measured preferential groundwater delivery of GHGs to stream banks within three stream reaches, and found that stream banks with discharging groundwater emitted more CO₂ and were sources of N₂O compared to stream banks without actively discharging groundwater, which emitted less CO₂ and were N₂O sinks. At one of our stream reaches, groundwater CO₂ and N₂O concentrations were 1.4–19.2 and 1.1–40.6 times higher than those in surface water, respectively, and groundwater delivery rates of CO₂ and N₂O were 1.5 and 1.6 times higher than surface water emissions per unit area. On average, 21% (range 0%–100%) of CO₂ and N₂O were emitted at the stream bank before mixing with surface waters. Preferential groundwater GHG emissions may contribute substantially to stream corridor emissions and may be underestimated when using a channel-centric approach to estimate riverine GHG budgets.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533380","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":"Carbon Burial (in)Efficiency: Tracking the Molecular Fingerprint of In Situ Organic Matter Burial Using a 30-Year Freeze-Core Series From a Northern Boreal Lake (Nylandssjön, Sweden)","authors":"Richard Bindler,&nbsp;Julie Tolu,&nbsp;Christian Bigler,&nbsp;Johan Rydberg,&nbsp;Antonio Martínez Cortizas","doi":"10.1029/2024JG008397","DOIUrl":"https://doi.org/10.1029/2024JG008397","url":null,"abstract":"<p>Organic carbon (OC) burial rates in northern lakes are estimated to have increased by 2–3 fold over the past 150 years. However, assessing OC burial efficiency is challenging because (a) long-term (decadal) process are difficult to study in situ, and (b) sediment organic matter (OM) consists of thousands of different compounds from both terrestrial and aquatic sources, which are subject to different degrees of degradation, transformation, or preservation. Here, we used pyrolysis–gas chromatography/mass spectrometry to track changes in the organic molecular composition of individual varve years in a series of sediment freeze cores collected during 1979–2010, allowing us to assess diagenetic changes over ≤31 years (or 12.5 cm depth). As predicted from previous work, the greatest losses over time/depth (18–19 years; 8.5 cm) are for compounds indicative of fresh OM, both terrestrial (e.g., levosugars with 58%–77% lost) and particularly aquatic origin (e.g., phytadiene and phytene amongst chlorophylls with 40%–82% lost). This high variability in degradation of specific compounds has implications for interpreting past changes in C and N. Although OM composition changes only slightly beyond 20 years (8.5 cm), the chlorophyll:lignin ratio (fresh vs. degraded compounds) continues to decline to 31 years (12.5 cm) and is predicted to continue up to 100 years (37 cm depth). In most northern lakes, indications of OM degradation to these depths correspond to sediment ages of 50 to &gt;150 years, suggesting that much of the recent increase in OC burial in northern lakes does not represent permanent sequestration of C.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JG008397","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143530540","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":"A Deep Learning Approach of Artificial Neural Network With Attention Mechanism to Predicting Marine Biogeochemistry Data","authors":"Mingzhi Liu,&nbsp;Yipeng Wang,&nbsp;Guoqiang Zhong,&nbsp;Yongxin Liu,&nbsp;Xiaoqing Liu,&nbsp;Jifan Shi,&nbsp;Yangli Che,&nbsp;Rui Bao","doi":"10.1029/2024JG008386","DOIUrl":"https://doi.org/10.1029/2024JG008386","url":null,"abstract":"<p>Predicting marine biogeochemical data is an effective method to solve the problem of marine data-scarcity and provides data support for fundamental research in marine science. Machine learning techniques are commonly used to improve the stability and accuracy of predicting biogeochemistry data. However, current methods based on Random Forest (RF) and Artificial Neural network (ANN) often struggle to effectively capture the intricate features of ocean data, resulting in suboptimal prediction accuracy. In this study, we develop a novel deep learning method called artificial neural network with attention mechanism (ANN-att) for predicting marine biogeochemistry data. We compare and evaluate the performance of RF, ANN, and ANN-att based on two widely used ocean data sets in marine biogeochemistry: GLODAP v2.2022 and MOSAIC 2.0. Our results show that the prediction accuracy of the ANN-att method is higher than other methods by 6% for GLODAP v2.2022 and 30% for MOSAIC v.2.0. Additionally, the prediction maps of surface ocean dissolved oxygen and Δ¹⁴C in the West Pacific demonstrate that ANN-att has a significant advantage in predicting marine biogeochemistry data with stronger nonlinear characteristics.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143530044","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":"In Situ Reduction of Fe(III) (Hydr)oxides-Bound As(V) via Electron Shuttling in the Presence of Organic Matter","authors":"Zhengqi Su,&nbsp;Huaming Guo,&nbsp;Zhipeng Gao,&nbsp;Tiantian Ke,&nbsp;Xiaojun Feng,&nbsp;Lingzhi Zhang","doi":"10.1029/2024JG008675","DOIUrl":"https://doi.org/10.1029/2024JG008675","url":null,"abstract":"<p>Although the reduction of pentavalent arsenic (As(V)) bound to Fe(III) (hydr)oxides (As(V)-containing FeOOH) coupled with organic matter (OM) degradation has received extensive attention, little is known about in situ reduction of FeOOH mineral-bound As(V) (As(V)_(s)) via electron shuttling in the presence of As(V)-reducing bacteria (AsRB). Here, anthraquinone-2,6-disulfonate (AQDS), Suwannee River humic acid (SRHA), and fulvic acid (SRFA) were used to establish an agar electron shuttle system with ferrihydrite-As(V)/goethite-As(V) and AsRB, which was isolated from high-As groundwater as the candidate strain (RA-1). We found that AQDS was more efficient in shuttling electrons to reduce As(V)_(s) and Fe(III) than SRHA and SRFA. High contents of quinone moieties in AQDS indicated that quinone moieties were conducive to As(V)_(s) and Fe(III) reduction. The reduction kinetic rates (<i>K</i>_red) of As(V)_(s) were higher than those of Fe(III), indicating the occurrence of in situ As(V)_(s) reduction via electron shuttling. Furthermore, <i>K</i>_red of As(V)_(s) for ferrihydrite-As(V) systems was greater than that of goethite-As(V) systems, demonstrating that As(V) bound to ferrihydrite via monodentate was more easily reduced than that bound to goethite via bidentate. The relative expression levels of As metabolic genes (<i>ars</i>C, <i>arr</i>A, and <i>ars</i>B) initially increased and then decreased in the late stage of experiments. High As concentrations in suspension inhibited the transcriptional activity of As metabolic genes in the late stage, reducing the electron production efficiency of RA-1 and subsequently slowing in situ reduction of As(V)_(s). This study highlights the importance of OM electron shuttling in the reduction of As(V)_(s), offering new perspectives in As enrichment in groundwater.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513845","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":"Novel Field Experiment on Alkalinity Enhancement in Intertidal Environments—A Trailblazer for Natural Climate Solutions","authors":"I. Mendes,&nbsp;J. Lübbers,&nbsp;J. Schönfeld,&nbsp;A. Baldermann,&nbsp;A. R. Carrasco,&nbsp;A. Cravo,&nbsp;A. Gomes,&nbsp;P. Grasse,&nbsp;F. M. Stamm","doi":"10.1029/2024JG008591","DOIUrl":"https://doi.org/10.1029/2024JG008591","url":null,"abstract":"<p>One recently proposed approach to reduce atmospheric CO₂ concentrations is marine alkalinity enhancement. This technique increases the CO₂ uptake capacity of seawater through weathering of fine-grained (mafic) rocks and minerals in marine environments. The weathering process has been extensively tested in laboratory studies and verified by numerical models. Field experiments scaling the CO₂ uptake under natural conditions are still lacking. In a methodological approach, a novel in situ experiment was designed and installed in a salt marsh at Ria Formosa coastal lagoon, southern Portugal. The experiment comprised deployments of different sizes of olivine and basalt substrates, and a control site, which were tidally submerged twice a day. A monthly monitoring scheme of supernatant and porewater properties from each deployment and control site was established, and procedures for temperature, salinity, oxygen, pH, total alkalinity, nutrient, and trace metal analyses were defined. This paper is devoted to the methods and describes the design, a protocol for the analyses, and an evaluation of experimental performance and reliability. Data from the first 6 months are presented for validation of the experiment. They demonstrated elevated total alkalinity in water samples, mostly in porewater after the deployments, while salinity, oxygen, and pH reflect the control conditions. Significant alkalinity differences were observed between the treatments and the natural background conditions monitored at the control site, during the 6 months of the experiment. The methodological approach is presented with strengths, limitations, and recommendations for an upscaling as CO₂ removal measure, servicing, and subsequent investigations.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JG008591","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513600","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":"Interplay of Seasonal Hydrology and Landscape Topography Drives Black Carbon Export in the Fraser River","authors":"Emily Brown,&nbsp;Sasha Wagner,&nbsp;Brian P. V. Hunt","doi":"10.1029/2024JG008627","DOIUrl":"https://doi.org/10.1029/2024JG008627","url":null,"abstract":"<p>Fire is an important driver of carbon cycling across terrestrial and aquatic ecosystems, but global fire regimes are changing. Black carbon (BC), a product of biomass burning, is more environmentally persistent than its parent biomass carbon and cycles differently than bulk organic carbon. This study aims to refine understanding of the environmental drivers of BC flux from land to ocean through year-long measurement of BC in the Fraser River in British Columbia, Canada. The Fraser River’s environmental context is distinct from systems that currently form the basis of understanding of BC export, characterized by highly seasonally variable hydrology, and with its basin spanning diverse ecosystems from glaciated mountainous regions to dry flatlands. We found that the Fraser River exported 18,765 ± 2,734 Mg yr⁻¹ of BC, with dissolved black carbon (DBC) comprising 3.3 ± 0.9% of annual dissolved organic carbon (DOC) flux, both lower than previous estimates would suggest. Strong seasonal variation in the DBC content of DOC and BC aromaticity were measured in the Fraser River. This reveals the importance of seasonal hydrology in the export of different pools of BC and indicates that seasonality and hydrologic regime should be given more consideration in future estimations of global riverine BC flux. These findings bring to light the importance of seasonality, hydrology, and basin topography in BC transport, with implications for global carbon cycles in a changing climate.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JG008627","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143497371","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":"SOMnmR: An R Package for Analyzing CP MAS 13C NMR Spectra of Environmental Samples","authors":"Luis Carlos Colocho Hurtarte,&nbsp;Noelia Garcia-Franco,&nbsp;Gabriela Villalba Ayala,&nbsp;Joerg Prietzel,&nbsp;Ingrid Koegel-Knabner","doi":"10.1029/2024JG008288","DOIUrl":"https://doi.org/10.1029/2024JG008288","url":null,"abstract":"<p>Cross-polarization (CP) magic angle spinning (MAS) ¹³C NMR spectroscopy is a versatile tool for studying organic matter (OM) in soils. Despite its versatility, the extensive post-processing required—including spinning-sidebands (SSB) correction and integration—limits its broader use. We present a new open-source R package, “SOMnmR” (accessible on CRAN and GitHub), designed to quickly process a large number of spectra, correcting for SSBs if required. The package computes the relative abundance of functional groups and can also model organic matter composition using end-member compounds. We describe the package's installation and functionalities and provide examples that (a) compare the results of two different spectrometers and (b) model the results of a large CP MAS ¹³C NMR data set. Overall, the presented package is a valuable tool for the fast analysis of ¹³C NMR data sets.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 2","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143475545","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":"Peatland Plant Community Changes in Annual Production and Composition Through 8 Years of Warming Manipulations Under Ambient and Elevated CO2 Atmospheres","authors":"P. J. Hanson,&nbsp;N. A. Griffiths,&nbsp;V. G. Salmon,&nbsp;J. M. Birkebak,&nbsp;J. M. Warren,&nbsp;J. R. Phillips,&nbsp;M. P. Guilliams,&nbsp;K. C. Oleheiser,&nbsp;M. W. Jones,&nbsp;N. J. Jones,&nbsp;J. Enterkine,&nbsp;N. F. Glenn,&nbsp;K. J. Pearson","doi":"10.1029/2024JG008511","DOIUrl":"https://doi.org/10.1029/2024JG008511","url":null,"abstract":"<p>The Spruce and Peatland Responses Under Changing Environments (SPRUCE) experiment has operated five whole-ecosystem warming manipulations (+0, +2.25, +4.5, +6.75, and +9°C) with paired ambient and elevated CO₂ atmospheres (eCO₂, +500 ppm) for 8 full calendar years (since August 2015). We tracked shrub-layer vegetation responses to the treatments using annual destructive plot sampling. Tree (<i>Picea</i> and <i>Larix</i>) responses were assessed annually using nondestructive dimensional analyses and allometric conversions. Shrub community changes were assessed for key ericaceous shrubs (<i>Rhododendron, Chamaedaphne,</i> and <i>Kalmia</i>), two <i>Vaccinium</i> species (<i>V. angustifolium, V. oxycoccos</i>), graminoid species (mostly <i>Eriophorum</i>), and one common forb (<i>Maianthemum trifolium</i>), plus minor understory species. We tracked annual aboveground net primary production (ANPP) for vascular plant species in gC m⁻² y⁻¹ and overall stand contribution in dry mass. We observed a linear increase in shrub-layer aboveground biomass accumulation with warming over time due primarily to an increase in ericaceous shrub abundance. Cumulative biomass increases across the shrub community showed overall positive responses to eCO₂ after 8 years. Community composition also changed with warming, with increases in woody shrub density, and the reduction or loss of forbs. The tree community showed minimal initial responses to warming early in the treatments, but since 2020, has shown significant increases in ANPP and individual tree growth with warming. The main driver of change in the vascular plant community was temperature, with less pronounced effects of eCO₂ evident. These results indicate an overall increase in ANPP with warming from both the tree and shrub layers of peatland vegetation.</p>","PeriodicalId":16003,"journal":{"name":"Journal of Geophysical Research: Biogeosciences","volume":"130 2","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JG008511","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446957","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}