Biogeochemistry最新文献

{"title":"Biological nitrogen fixation and nifH gene abundance in deadwood of 13 different tree species","authors":"Christina Groß,&nbsp;Shakhawat Hossen,&nbsp;Henrik Hartmann,&nbsp;Matthias Noll,&nbsp;Werner Borken","doi":"10.1007/s10533-022-00986-w","DOIUrl":"10.1007/s10533-022-00986-w","url":null,"abstract":"<div><p>Deadwood is an extremely nitrogen (N) poor plant litter whose decomposition may rely on external N sources. Biological N₂ fixation (BNF) by free-living diazotrophs, encoded with the <i>nifH</i> gene, is a potential pathway of N acquisition in deadwood. Still, the control of this process by tree species specific traits is hardly known. Here, we examined (1) BNF rates and <i>nifH</i> gene abundances in deadwood of 13 tree species after 12 years of decomposition and (2) how BNF was related to nutrient concentrations and non-structural carbohydrates (NSC). Comparing our BNF rates with the literature revealed no difference for angiosperms but gymnosperms. Large variability prevented any significant difference in BNF and <i>nifH</i> gene abundance between tree species identities of deadwood. Still, higher BNF and <i>nifH</i> gene abundances occurred in the group of diffuse-porous angiosperms compared to ring-porous angiosperms and gymnosperms. Positive relationships between BNF rates and molybdenum, phosphor, sulfur, and N suggested co-limitation of BNF by several nutrients in deadwood. Relatively high NSC concentrations indicated good carbon availability for diazotrophs. Furthermore, structural equation modeling highlighted the importance of water content for BNF and <i>nifH</i> gene abundance, although the overall explanatory power was low. In conclusion, BNF is a ubiquitous microbial process in deadwood of native European tree species and the comparison with other studies suggests no down-regulation of BNF by high N deposition in Central Europe.\u0000</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"161 3","pages":"353 - 371"},"PeriodicalIF":4.0,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-022-00986-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4100224","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":"Patterns and controls of aboveground litter inputs to temperate forests","authors":"Fiona V. Jevon,&nbsp;Alexander Polussa,&nbsp;Ashley K. Lang,&nbsp;J. William Munger,&nbsp;Stephen A. Wood,&nbsp;William R. Wieder,&nbsp;Mark. A. Bradford","doi":"10.1007/s10533-022-00988-8","DOIUrl":"10.1007/s10533-022-00988-8","url":null,"abstract":"<div><p>Aboveground litter production is an important biogeochemical pathway in forests whereby carbon and nutrients enter soil detrital pools. However, patterns and controls of aboveground litter production are often based on an understanding of how autumnal, foliar inputs are related to aboveground tree production. Here we use three separate data sources of aboveground litter production in temperate forests to ask how aboveground woody productivity affects foliar litter production in light of other factors, such as the climate sensitivity of litter production and the seasonality of not only foliar but also fine woody debris and reproductive litter inputs. We find that foliar litter production increases with aboveground woody production, and this relationship is modified both by plant functional group and climate. Basal area also provides a crucial control on litter production. Conifer forests produce approximately half as much foliar litter as broadleaf deciduous forests. Litter production is sensitive to both among-site and among-year variation in climate, such that more litter is produced in warmer, wetter locations and years. On average 72% of aboveground litter is foliar material, with the remaining split about evenly between fine woody debris and reproductive material, and although about 88% of broadleaf litter falls during autumn, only about 61% of needles, 37% of fine woody debris and 43% of reproductive material falls during the same period. Together these results illustrate key differences in the controls of litter production in coniferous and deciduous forests, and highlight the importance of often overlooked litter fluxes, including non-autumn and non-foliar litterfall.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"161 3","pages":"335 - 352"},"PeriodicalIF":4.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-022-00988-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4050512","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":"Evidence from molecular marker and FT-ICR-MS analyses for the source and transport of dissolved black carbon under variable water discharge of a subtropical Estuary","authors":"Weiqiang Zhao,&nbsp;Hongyan Bao,&nbsp;Dekun Huang,&nbsp;Jutta Niggemann,&nbsp;Thorsten Dittmar,&nbsp;Shuh-Ji Kao","doi":"10.1007/s10533-022-00987-9","DOIUrl":"10.1007/s10533-022-00987-9","url":null,"abstract":"<div><p>Dissolved black carbon (DBC) is the largest known refractory organic carbon pool in the ocean. However, processes in estuaries connecting rivers (a significant DBC source) and oceans are underexplored. We carried out two sampling campaigns in the Jiulong River estuary (JRE) and conducted a dissolved organic matter (DOM) mixing experiment. DBC was quantified by the benzenepolycarboxylic acid (noted as DBC-BPCA) method and characterized with Fourier transform ion cyclotron resonance mass spectrometry (noted as DBC-FT). The molecular formulae of DBC-FT in the JRE were also compared with that in soil and atmospheric deposition. Overall, DBC-BPCA was removed during seaward dispersion. Soil- and deposition-derived molecules were identified in the DBC-FT of the JRE, confirming deposition inputs to estuarine DBC for the first time. The salinity-dependent decrease in the intensity normalized modified aromatic index (AI_mod) of DBC-FT and in DBC-BPCA revealed that DBC composition and concentration were primarily controlled by mixing. However, photodegradation and particle adsorption/flocculation may play a role in removing DBC depending on the concentration of total suspended matter (TSM). The two campaigns showed that high discharge increased both riverine input and estuarine output of DBC. However, the removal patterns of DBC-BPCA were minimally influenced by discharge. We further estimated that approximately 20% DBC-BPCA was lost in this estuary annually. Future studies should investigate the transformation of DBC in coastal bays and the open ocean where the residence time is longer and the transparency of bulk water is higher.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"162 1","pages":"43 - 55"},"PeriodicalIF":4.0,"publicationDate":"2022-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5135525","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":"Molecular tracers for characterization and distribution of organic matter in a freshwater lake system from the Lesser Himalaya","authors":"Diptimayee Behera,&nbsp;Sharmila Bhattacharya,&nbsp;Abdur Rahman,&nbsp;Sanjeev Kumar,&nbsp;Ambili Anoop","doi":"10.1007/s10533-022-00984-y","DOIUrl":"10.1007/s10533-022-00984-y","url":null,"abstract":"<div><p>The knowledge of distribution and sources of organic matter (OM) in aquatic systems is important to understand the biogeochemical cycling of carbon in terrestrial environments. In this study, we have evaluated quantitative contributions of OM sources and their distribution using bulk geochemical parameters (TOC and δ¹³C_org), <i>n</i>-alkane indices and source specific biomarkers (C₂₀ highly branched isoprenoid (HBI)) in Renuka Lake in Lesser Himalaya. The principal sources of OM in the sediments were aquatic productivity with minor input from terrestrial plants, which varied from littoral to central part of the lake. The microbial community in Renuka Lake were established using short chain <i>n-</i>alkanes and C₂₀ HBI, whereas pristane/phytane (Pr/Ph) depicts depositional condition of the lake system. The land use/land cover changes and grain size analysis were used to investigate the multiple reasons and processes that govern the spatial heterogeneity of the distribution of sedimentary OM. The results show that human activities and alterations of the aquatic landscape can significantly affect the composition and distribution of OM in aquatic systems. The present study shows that elucidating the sources and distribution of OM in an aquatic system is crucial for constraining the ecological status and aiding conservation measures.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"161 3","pages":"315 - 334"},"PeriodicalIF":4.0,"publicationDate":"2022-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-022-00984-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4873879","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":"Optical properties of dissolved organic matter in throughfall and stemflow vary across tree species and season in a temperate headwater forest","authors":"Kevin A. Ryan,&nbsp;Thomas Adler,&nbsp;Ann T. Chalmers,&nbsp;Julia Perdrial,&nbsp;Stephen Sebestyen,&nbsp;James B. Shanley,&nbsp;Aron Stubbins","doi":"10.1007/s10533-022-00985-x","DOIUrl":"10.1007/s10533-022-00985-x","url":null,"abstract":"<div><p>Tree-derived dissolved organic matter (DOM) comprises a significant carbon flux within forested watersheds. Few studies have assessed the optical properties of tree-derived DOM. To increase understanding of the factors controlling tree-derived DOM quality, we measured DOM optical properties, dissolved organic carbon (DOC) and calcium concentrations in throughfall and stemflow for 17 individual rain events during summer and fall in a temperate deciduous forest in Vermont, United States. DOC and calcium fluxes in throughfall and stemflow were enriched on average 4 to 70 times incident fluxes in rain. A multiway model was developed using absorbance and fluorescence spectroscopy to further characterize DOM optical properties. Throughfall contained a higher percentage of protein-like DOM fluorescence than stemflow while stemflow was characterized by a higher percentage of humic-like DOM fluorescence. DOM absorbance spectral slopes in yellow birch (<i>Betula alleghaniensis</i>) stemflow were significantly higher than in sugar maple (<i>Acer saccharum</i>) stemflow. DOM optical metrics were not influenced by rainfall volume, but percent protein-like fluorescence increased in throughfall during autumn when leaves senesced. Given the potential influence of tree-derived DOM fluxes on receiving soils and downstream ecosystems, future modeling of DOM transport and soil biogeochemistry should represent the influence of differing DOM quality in throughfall and stemflow across tree species and seasons.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"164 1","pages":"53 - 72"},"PeriodicalIF":4.0,"publicationDate":"2022-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-022-00985-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4809274","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":"Patterns in riverine carbon, nutrient and suspended solids export to the Eastern James Bay: links to climate, hydrology and landscape","authors":"Michaela L. de Melo,&nbsp;Marie-Laure Gérardin,&nbsp;Caroline Fink-Mercier,&nbsp;Paul A. del Giorgio","doi":"10.1007/s10533-022-00983-z","DOIUrl":"10.1007/s10533-022-00983-z","url":null,"abstract":"<div><p>The Eastern James Bay has been undergoing major shifts in its physical, chemical, and ecological functioning over the past decades, driven by a combination of climate and landscape changes, and human intervention that includes the damming of major regional rivers. Rivers play a role in the functioning of the Bay, delivering not only freshwater and key materials but also transmitting environmental and climatic signals. Here we present a study of the spatial variability of riverine export fluxes and yields of freshwater, dissolved organic carbon (DOC), total suspended solids, total nitrogen, and total phosphorus of 18 major rivers flowing into Eastern James Bay, in the boreal region of Québec (CA). We characterized discharge patterns and identified and modeled the main landscape drivers of riverine material concentrations in these watersheds. We then combined these to model the contribution of unsampled watersheds to generate a regional budget of riverine freshwater and material export to the Bay. The peak of water export occurs in spring for free-flowing rivers, whereas for the dammed river La Grande, which accounts for half of the freshwater inputs, the peak discharge was shifted to winter due to high energy demands. The large gradient of watershed areas, discharge and environmental conditions resulted in the wide range of material concentrations across these boreal rivers, and we show that overall, the James Bay is a hot spot of DOC loading to the entire Hudson Bay System. We further reconstructed past (pre-damming) riverine export and compared this with current, and potential future scenarios, and we demonstrate that damming and climate change are impacting the patterns of water and material export of these boreal rivers to the Eastern James Bay.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"161 3","pages":"291 - 314"},"PeriodicalIF":4.0,"publicationDate":"2022-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4804911","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":"Correction to: Soil mineral fraction influences the bacterial abundance: evidence from a mineral and plant materials incubation study","authors":"Tomohiro Yokobe,&nbsp;Fujio Hyodo,&nbsp;Ryunosuke Tateno,&nbsp;Naoko Tokuchi","doi":"10.1007/s10533-022-00982-0","DOIUrl":"10.1007/s10533-022-00982-0","url":null,"abstract":"","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"161 3","pages":"289 - 290"},"PeriodicalIF":4.0,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4700752","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":"Mechanisms and magnitude of dissolved silica release from a New England salt marsh","authors":"Olivia L. Williams,&nbsp;Andrew C. Kurtz,&nbsp;Meagan J. Eagle,&nbsp;Kevin D. Kroeger,&nbsp;Joseph J. Tamborski,&nbsp;Joanna C. Carey","doi":"10.1007/s10533-022-00976-y","DOIUrl":"10.1007/s10533-022-00976-y","url":null,"abstract":"<div><p>Salt marshes are sites of silica (SiO₂) cycling and export to adjacent coastal systems, where silica availability can exert an important control over coastal marine primary productivity. Mineral weathering and biologic fixation concentrate silica in these systems; however, the relative contributions of geologic versus biogenic silica dissolution to this export are not known. We collected water samples from the tidal creek of a relatively undisturbed New England (USA) salt marsh over 13 tidal cycles in spring, summer, and fall 2014–2016 to determine patterns of dissolved silica (DSi) concentration in the water entering and leaving the marsh. DSi concentrations in the tidal creek peaked in the summer and were at a minimum in the fall. Additionally, we analyzed DSi concentrations and Ge/Si ratios in marsh porewater and groundwater samples as a tracer of DSi origin. Ge/Si ratios in the porewater, subterranean estuary, and fresh groundwater averaged 6.3 ± 0.31 µmol/mol, which is consistent with production via silicate weathering rather than biogenic silica dissolution. These results highlight a previously unstudied role marsh sediment plays in coastal biogeochemistry by supplying DSi to coastal ecosystems. This marsh exported 1170 mmol DSi m⁻² year⁻¹, 85% of which originated from porewater exchange, with minor contributions from brackish groundwater discharge from the subterranean estuary. Examining these values in the context of the other known DSi inputs indicates that coastal marshes provide ~ 75% of the annual silica inputs into the adjacent estuary, Waquoit Bay.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"161 3","pages":"251 - 271"},"PeriodicalIF":4.0,"publicationDate":"2022-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4664216","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":"Past anthropogenic activities offset dissolved inorganic phosphorus retention in the Mississippi River basin","authors":"Lauriane Vilmin,&nbsp;Alexander F. Bouwman,&nbsp;Arthur H. W. Beusen,&nbsp;Wim Joost van Hoek,&nbsp;José M. Mogollón","doi":"10.1007/s10533-022-00973-1","DOIUrl":"10.1007/s10533-022-00973-1","url":null,"abstract":"<div><p>The rapid acceleration of anthropogenic phosphorus (P) loadings to watersheds has fuelled massive freshwater and coastal eutrophication and completely changed the global P cycle. Within watersheds, emitted P is transported downstream towards estuaries. Reservoirs can retain a significant proportion of this P. In the long term, this accumulated P can however be re-mobilized, a process lacking in current global P budgets. Here, we include P cycling in a coupled integrated assessment-hydrology-biogeochemistry framework with 0.5 by 0.5-degree spatial resolution and an annual time resolution, and apply it to the Mississippi River basin (MRB). We show that, while reservoirs have aided in the net retention of P, they serve as dissolved inorganic P (DIP) sources due to the transformation of legacy P in sediments. The increasing DIP sourcing in the MRB has been offsetting P retention in streams, especially towards the end of the twentieth century. Due to its bioavailability, DIP is the most likely form to trigger eutrophication. Although P inputs into the MRB have decreased since the 1970s, legacy effects are delaying positive outcomes of remediation measures.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"161 2","pages":"157 - 169"},"PeriodicalIF":4.0,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-022-00973-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4480293","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":"Effects of experimental and seasonal drying on soil microbial biomass and nutrient cycling in four lowland tropical forests","authors":"Lee H. Dietterich,&nbsp;Nicholas J. Bouskill,&nbsp;Makenna Brown,&nbsp;Biancolini Castro,&nbsp;Stephany S. Chacon,&nbsp;Lily Colburn,&nbsp;Amanda L. Cordeiro,&nbsp;Edwin H. García,&nbsp;Adonis Antonio Gordon,&nbsp;Eugenio Gordon,&nbsp;Alexandra Hedgpeth,&nbsp;Weronika Konwent,&nbsp;Gabriel Oppler,&nbsp;Jacqueline Reu,&nbsp;Carley Tsiames,&nbsp;Eric Valdes,&nbsp;Anneke Zeko,&nbsp;Daniela F. Cusack","doi":"10.1007/s10533-022-00980-2","DOIUrl":"10.1007/s10533-022-00980-2","url":null,"abstract":"<div><p>Changes in precipitation represent a major effect of climate change on tropical forests, which contain some of the earth’s largest terrestrial carbon (C) stocks. Such changes are expected to influence microbes, nutrients, and the fate of C in tropical forest soils. To explore this, we assessed soil microbial biomass, potential extracellular enzyme activities, and nutrient availability in a partial throughfall exclusion experiment in four seasonal lowland tropical humid forests in Panama with wide variation in precipitation and soil fertility. We hypothesized that throughfall exclusion would reduce microbial biomass and activity and accentuate dry season soil nutrient accumulation, with larger effects in wetter, less drought-resistant forests. We observed a baseline seasonal pattern of decreased microbial biomass and increased extractable dissolved organic C (DOC), total dissolved nitrogen (TDN), nitrate (NO₃⁻), and resin-extractable phosphorus (P) in the dry season, with the strongest patterns for nitrogen (N). However, potential enzyme activities showed no consistent seasonality. In line with seasonal drying, throughfall exclusion decreased soil microbial biomass in the wet season and increased TDN and NO₃⁻, especially in the dry season. In contrast to seasonal drying, throughfall exclusion decreased DOC and did not affect resin-extractable P, but slightly decreased potential phosphatase activities. Potential enzyme activities varied among sites and sampling times, but did not explain much variation in microbial biomass or substrate availability. We conclude that reduced rainfall in tropical forests might accentuate some dry season patterns, like reductions in microbial biomass and accumulation of extractable nutrients. However, our data also suggest new patterns, like reduced inputs of DOC to soils with drying, which could have cascading effects on soil ecological function and C storage.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"161 2","pages":"227 - 250"},"PeriodicalIF":4.0,"publicationDate":"2022-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-022-00980-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4436490","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}