Biogeochemistry最新文献

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Ultrahigh resolution dissolved organic matter characterization reveals distinct permafrost characteristics on the Peel Plateau, Canada 超高分辨率溶解有机质表征揭示了加拿大皮尔高原永久冻土的独特特征
IF 3.9 3区 环境科学与生态学
Biogeochemistry Pub Date : 2023-12-06 DOI: 10.1007/s10533-023-01101-3
M. R. N. Moore, S. E. Tank, M. R. Kurek, M. Taskovic, A. M. McKenna, J. L. J. Smith, S. V. Kokelj, R. G. M. Spencer
{"title":"Ultrahigh resolution dissolved organic matter characterization reveals distinct permafrost characteristics on the Peel Plateau, Canada","authors":"M. R. N. Moore,&nbsp;S. E. Tank,&nbsp;M. R. Kurek,&nbsp;M. Taskovic,&nbsp;A. M. McKenna,&nbsp;J. L. J. Smith,&nbsp;S. V. Kokelj,&nbsp;R. G. M. Spencer","doi":"10.1007/s10533-023-01101-3","DOIUrl":"10.1007/s10533-023-01101-3","url":null,"abstract":"<div><p>The Arctic is warming at a rate twice that of other global ecosystems and changing climate conditions in the Arctic are mobilizing long frozen permafrost stores of organic carbon. In ice-rich regions, permafrost thaw on sloping terrain can cause land subsidence, and the development of thaw-driven mass wasting. The Peel Plateau, Northwest Territories, Canada has extensive thaw-driven landslides called retrogressive thaw slumps that are exposing early Holocene age paleo-thaw layers and Pleistocene age glaciogenic material deposited by the Laurentide Ice Sheet. This study aimed to see if unique retrogressive thaw slump derived permafrost inputs could be readily observed in streams across six diverse thermokarst features via optical and ultrahigh-resolution mass spectrometry. Aquatic samples from water draining thermokarst slump features, and downstream of thermokarst inputs exhibited higher dissolved organic carbon concentrations and lower aromaticity as evidenced by optical parameters (e.g. declining SUVA<sub>254</sub>, increasing <i>S</i><sub>275-295</sub>) and FT-ICR MS metrics (e.g. lower AI<sub>mod</sub> and nominal oxidation state of carbon) versus upstream of thermokarst impacts. Increases in the relative abundances of assigned heteroatomic molecular formulae (e.g. CHON, CHOS, CHONS) were also greater within and downstream of thermokarst features. The unique molecular formulae present in permafrost thermokarst inputs were determined (<i>n</i> = 1844) and subsequently tracked downstream. These permafrost marker formulae were enriched in aliphatics and H/C, as well as heteroatoms and exhibited low aromaticity. A portion of the unique molecular fingerprint persisted downstream, highlighting the potential to not only assess thermokarst inputs but also to follow these inputs and their fate downstream throughout the aquatic network.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 2","pages":"99 - 117"},"PeriodicalIF":3.9,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138491820","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}
引用次数: 0
Publisher Correction 出版商更正
IF 3.9 3区 环境科学与生态学
Biogeochemistry Pub Date : 2023-12-06 DOI: 10.1007/s10533-023-01109-9
{"title":"Publisher Correction","authors":"","doi":"10.1007/s10533-023-01109-9","DOIUrl":"10.1007/s10533-023-01109-9","url":null,"abstract":"","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"166 3","pages":"167 - 167"},"PeriodicalIF":3.9,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142410118","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}
引用次数: 0
Combination of factors rather than single disturbance drives perturbation of the nitrogen cycle in a temperate forest 因子的组合而不是单一的扰动驱动了温带森林氮循环的扰动
IF 4 3区 环境科学与生态学
Biogeochemistry Pub Date : 2023-12-03 DOI: 10.1007/s10533-023-01105-z
Mark B. Green, Linda H. Pardo, John L. Campbell, Emma Rosi, Emily S. Bernhardt, Charles T. Driscoll, Timothy J. Fahey, Nicholas LoRusso, Jackie Matthes, Pamela H. Templer
{"title":"Combination of factors rather than single disturbance drives perturbation of the nitrogen cycle in a temperate forest","authors":"Mark B. Green,&nbsp;Linda H. Pardo,&nbsp;John L. Campbell,&nbsp;Emma Rosi,&nbsp;Emily S. Bernhardt,&nbsp;Charles T. Driscoll,&nbsp;Timothy J. Fahey,&nbsp;Nicholas LoRusso,&nbsp;Jackie Matthes,&nbsp;Pamela H. Templer","doi":"10.1007/s10533-023-01105-z","DOIUrl":"10.1007/s10533-023-01105-z","url":null,"abstract":"<div><p>Nitrogen (N) is a critical element in many ecological and biogeochemical processes in forest ecosystems. Cycling of N is sensitive to changes in climate, atmospheric carbon dioxide (CO<sub>2</sub>) concentrations, and air pollution. Streamwater nitrate draining a forested ecosystem can indicate how an ecosystem is responding to these changes. We observed a pulse in streamwater nitrate concentration and export at a long-term forest research site in eastern North America that resulted in a 10-fold increase in nitrate export compared to observations over the prior decade. The pulse in streamwater nitrate occurred in a reference catchment in the 2013 water year, but was not associated with a distinct disturbance event. We analyzed a suite of environmental variables to explore possible causes. The correlation between each environmental variable and streamwater nitrate concentration was consistently higher when we accounted for the antecedent conditions of the variable prior to a given streamwater observation. In most cases, the optimal antecedent period exceeded two years. We assessed the most important variables for predicting streamwater nitrate concentration by training a machine learning model to predict streamwater nitrate concentration in the years preceding and during the streamwater nitrate pulse. The results of the correlation and machine learning analyses suggest that the pulsed increase in streamwater nitrate resulted from both (1) decreased plant uptake due to lower terrestrial gross primary production, possibly due to increased soil frost or reduced solar radiation or both; and (2) increased net N mineralization and nitrification due to warm temperatures from 2010 to 2013. Additionally, variables associated with hydrological transport of nitrate, such as maximum stream discharge, emerged as important, suggesting that hydrology played a role in the pulse. Overall, our analyses indicate that the streamwater nitrate pulse was caused by a combination of factors that occurred in the years prior to the pulse, not a single disturbance event.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"166 2","pages":"139 - 157"},"PeriodicalIF":4.0,"publicationDate":"2023-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138480986","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}
引用次数: 0
Topsoil removal for Sphagnum establishment on rewetted agricultural bogs 复湿农业沼泽沼地泥炭群落的表土清除
IF 3.9 3区 环境科学与生态学
Biogeochemistry Pub Date : 2023-11-26 DOI: 10.1007/s10533-023-01096-x
Sannimari A. Käärmelahti, Christian Fritz, Gabrielle R. Quadra, Maider Erize Gardoki, Greta Gaudig, Matthias Krebs, Ralph J. M. Temmink
{"title":"Topsoil removal for Sphagnum establishment on rewetted agricultural bogs","authors":"Sannimari A. Käärmelahti,&nbsp;Christian Fritz,&nbsp;Gabrielle R. Quadra,&nbsp;Maider Erize Gardoki,&nbsp;Greta Gaudig,&nbsp;Matthias Krebs,&nbsp;Ralph J. M. Temmink","doi":"10.1007/s10533-023-01096-x","DOIUrl":"10.1007/s10533-023-01096-x","url":null,"abstract":"<div><p>Rewetting drained agricultural peatlands aids in restoring their original ecosystem functions, including carbon storage and sustaining unique biodiversity. 30–60 cm of topsoil removal (TSR) before rewetting for <i>Sphagnum</i> establishment is a common practice to reduce nutrient concentrations and greenhouse gas emissions, and increase water conductivity. However, the topsoil is carbon-dense and preservation in situ would be favorable from a climate-mitigation perspective. The effect of reduced TSR on <i>Sphagnum</i> establishment and nutrient dynamics on degraded and rewetted raised bogs remains to be elucidated. We conducted a two-year field experiment under <i>Sphagnum</i> paludiculture management with three TSR depths: no-removal (TSR0), 5–10 cm (TSR5), and 30 cm (TSR30) removal. We tested the effects of TSR on <i>Sphagnum</i> establishment and performance, nutrient dynamics, and hotspot methane emissions. After two years, TSR5 produced similar <i>Sphagnum</i> biomass as TSR30, while vascular plant biomass was highest in TSR0. All capitula nitrogen (N &gt; 12 mg/g) indicated N-saturation. Phosphorus (P) was not limiting (N/P &lt; 30), but a potential potassium (K) limitation was observed in year one (N/K &gt; 3). In TSR0, ammonium concentrations were &gt; 150 µmol/l in year one, but decreased by 80% in year two. P-concentrations remained high (<i>c.</i> 100 µmol/l) at TSR0 and TSR5, and remained low at TSR30. TSR30 and TSR5 reduced hotspot methane emissions relative to TSR0. We conclude that all TSR practices have their own advantages and disadvantages with respect to <i>Sphagnum</i> growth, nutrient availability and vegetation development. While TSR5 may be the most suitable for paludiculture, its applicability for restoration purposes remains to be elucidated. Setting prioritized targets when selecting the optimal TSR with peatland rewetting is pivotal.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 4","pages":"479 - 496"},"PeriodicalIF":3.9,"publicationDate":"2023-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-023-01096-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138442234","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}
引用次数: 0
Semi-arid irrigation farm dams are a small source of greenhouse gas emissions 半干旱的农田灌溉大坝是温室气体排放的一个小来源
IF 4 3区 环境科学与生态学
Biogeochemistry Pub Date : 2023-11-25 DOI: 10.1007/s10533-023-01100-4
Jackie R. Webb, Wendy C. Quayle, Carlos Ballester, Naomi S. Wells
{"title":"Semi-arid irrigation farm dams are a small source of greenhouse gas emissions","authors":"Jackie R. Webb,&nbsp;Wendy C. Quayle,&nbsp;Carlos Ballester,&nbsp;Naomi S. Wells","doi":"10.1007/s10533-023-01100-4","DOIUrl":"10.1007/s10533-023-01100-4","url":null,"abstract":"<div><p>Small artificial waterbodies are larger emitters of carbon dioxide (CO<sub>2</sub>) and methane (CH<sub>4</sub>) than natural waterbodies. The Intergovernmental Panel on Climate Change (IPCC) recommends these waterbodies are accounted for in national emission inventories, yet data is extremely limited for irrigated landscapes. To derive a baseline of their greenhouse gas footprint, we investigated 38 irrigation farm dams in horticulture and broadacre cropping in semi-arid NSW, Australia. Dissolved CO<sub>2</sub>, CH<sub>4</sub>, and nitrous oxide (N<sub>2</sub>O) were measured in spring and summer, 2021–2022. While all dams were sources of CH<sub>4</sub> to the atmosphere, 52% of irrigation farm dams were sinks for CO<sub>2</sub> and 70% were sinks for N<sub>2</sub>O. Relationships in the linear mixed effect models indicate that CO<sub>2</sub> concentrations were primarily driven by dissolved oxygen (DO), ammonium, and sediment carbon content, while N<sub>2</sub>O concentration was best explained by an interaction between DO and ammonium. Methane concentrations did not display any relationship with typical biological variables and instead were related to soil salinity, trophic status, and size. Carbon dioxide-equivalent emissions were highest in small (&lt; 0.001 km<sup>2</sup>) dams (305 g CO<sub>2</sub>-eq m<sup>−2</sup> season<sup>−1</sup>) and in those used for recycling irrigation water (249 g CO<sub>2</sub>-eq m<sup>−2</sup> season<sup>−1</sup>), with CH<sub>4</sub> contributing 70% of average CO<sub>2</sub>-eq emissions. However, irrigation dams had considerably lower CH<sub>4</sub> emissions (mean 40 kg ha<sup>−1</sup> yr<sup>−1</sup>) than the IPCC emission factor (EF) of 183 kg CH<sub>4</sub> ha<sup>−1</sup> yr<sup>−1</sup> for constructed ponds and lower N<sub>2</sub>O EF of 0.06% than the indirect EF for agricultural surface waters (0.26%). This synoptic survey reveals existing models may be severely overestimating (4–5 times) farm dam CH<sub>4</sub> and N<sub>2</sub>O emissions in semi-arid irrigation areas. Further research is needed to define these artificial waterbodies in emissions accounting.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"166 2","pages":"123 - 138"},"PeriodicalIF":4.0,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138438705","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}
引用次数: 0
Minor effects of no-till treatment on GHG emissions of boreal cultivated peat soil 免耕处理对北方栽培泥炭土温室气体排放的影响较小
IF 3.9 3区 环境科学与生态学
Biogeochemistry Pub Date : 2023-11-23 DOI: 10.1007/s10533-023-01097-w
Henri Honkanen, Hanna Kekkonen, Jaakko Heikkinen, Janne Kaseva, Kristiina Lång
{"title":"Minor effects of no-till treatment on GHG emissions of boreal cultivated peat soil","authors":"Henri Honkanen,&nbsp;Hanna Kekkonen,&nbsp;Jaakko Heikkinen,&nbsp;Janne Kaseva,&nbsp;Kristiina Lång","doi":"10.1007/s10533-023-01097-w","DOIUrl":"10.1007/s10533-023-01097-w","url":null,"abstract":"<div><p>The greenhouse gas (GHG) emissions of spring cereal monoculture under long-term conventional tillage (CT) and no-till (NT) treatment established in 2018 were measured in a peatland in Southwestern Finland during the period 2018–2021. Nitrous oxide (N<sub>2</sub>O), carbon dioxide (CO<sub>2</sub>) and methane (CH<sub>4</sub>) fluxes were measured with chambers approximately every two weeks throughout the period under study. Net ecosystem exchange was measured during the growing seasons, and hourly ecosystem respiration (ER) and gross photosynthesis (GP) were modelled with empirical models. Across the whole period, annual emissions were 6.8 ± 1.2 and 5.7 ± 1.2 Mg CO<sub>2</sub>–C ha <sup>−1</sup> yr<sup>−1</sup> (net ecosystem carbon balance), 8.8 ± 2.0 and 7.1 ± 2.0 kg N<sub>2</sub>O–N ha<sup>−1</sup> yr<sup>−1</sup>, and − 0.43 ± 0.31 and − 0.40 ± 0.31 kg CH<sub>4</sub>-C ha<sup>−1</sup> yr<sup>−1</sup> for CT and NT, respectively. The global warming potential was lower in NT (p = 0.045), and it ranged from 26 to 34 Mg CO<sub>2</sub> eq. ha<sup>−1</sup> yr<sup>−1</sup> in CT and from 19 to 31 Mg CO<sub>2</sub> eq. ha<sup>−1</sup> yr<sup>−1</sup> in NT. The management effect on the rates of single GHGs was not consistent over the years. Higher GP was found in CT in 2019 and in NT in 2020. Differences in ER between treatments occurred mostly outside the growing season, especially after ploughing, but the annual rates did not differ statistically. NT reduced the N<sub>2</sub>O emissions by 31% compared to CT in 2020 (p = 0.044) while there were no differences between the treatments in other years. The results indicate that NT may have potential to reduce slightly CO<sub>2</sub> and N<sub>2</sub>O emissions from cultivated peat soil, but the results originate from the first three years after a management change from CT to NT, and there is still a lack of long-term results on NT on cultivated peat soils.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 4","pages":"499 - 522"},"PeriodicalIF":3.9,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-023-01097-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138297161","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}
引用次数: 0
Long-term nitrogen fertilization impacts plant-microbial interactions differently in arbuscular and ectomycorrhizal trees 长期施氮对丛枝菌根树和外生菌根树植物-微生物相互作用的影响不同
IF 4 3区 环境科学与生态学
Biogeochemistry Pub Date : 2023-11-21 DOI: 10.1007/s10533-023-01099-8
Joseph E. Carrara, Nanette C. Raczka, Edward R. Brzostek
{"title":"Long-term nitrogen fertilization impacts plant-microbial interactions differently in arbuscular and ectomycorrhizal trees","authors":"Joseph E. Carrara,&nbsp;Nanette C. Raczka,&nbsp;Edward R. Brzostek","doi":"10.1007/s10533-023-01099-8","DOIUrl":"10.1007/s10533-023-01099-8","url":null,"abstract":"<div><p>Enhanced nitrogen (N) availability in temperate forests has altered ecosystem carbon (C) and N cycling. Recent research has shown that these alterations lead to reductions in belowground C allocation by trees and that the consequences of these reductions on soil C and nutrient cycling may vary by mycorrhizal type. We hypothesized that trees that associate with ectomycorrhizal fungi (ECM) would reduce C allocation towards roots and mycorrhizal fungi to a greater extent than trees that associate with arbuscular mycorrhizal fungi (AM) in response to &gt; 25 years of N fertilization. We further hypothesized that N induced decoupling of roots and microbes in ECM trees would be evidenced by greater declines in extracellular enzyme activities. We measured belowground C allocation to fine root biomass and mycorrhizal colonization in 6 AM and 6 ECM dominated plots in the N fertilized and reference watersheds at the Fernow Experimental Forest in West Virginia, USA. We compared these to measurements of simple-C, complex-C, nitrogen, and phosphorus acquiring enzyme activities in organic horizon, bulk mineral, and rhizosphere soil fractions. N fertilization reduced fine root biomass and mycorrhizal colonization in both AM and ECM stands. We found more consistent reductions in enzyme activities in ECM soils than AM soils under N fertilization which may have been driven by greater declines in root-C transfer to soil microbes. This mechanism helps to explain variability in soil C cycling responses across N gradient and fertilization experiments and may prove useful in predicting the fate of soil C stocks in response to N deposition.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"166 2","pages":"109 - 122"},"PeriodicalIF":4.0,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138294047","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}
引用次数: 0
Correction to: Nitrogen fixation rates in the Guinea Dome and the equatorial upwelling regions in the Atlantic Ocean 更正:大西洋几内亚穹隆和赤道上升流区域的固氮率
IF 3.9 3区 环境科学与生态学
Biogeochemistry Pub Date : 2023-11-21 DOI: 10.1007/s10533-023-01106-y
Ana Fernández-Carrera, Rainer Kiko, Helena Hauss, Douglas S. Hamilton, Eric P. Achterberg, Joseph P. Montoya, Marcus Dengler, Peter Brandt, Ajit Subramaniam
{"title":"Correction to: Nitrogen fixation rates in the Guinea Dome and the equatorial upwelling regions in the Atlantic Ocean","authors":"Ana Fernández-Carrera,&nbsp;Rainer Kiko,&nbsp;Helena Hauss,&nbsp;Douglas S. Hamilton,&nbsp;Eric P. Achterberg,&nbsp;Joseph P. Montoya,&nbsp;Marcus Dengler,&nbsp;Peter Brandt,&nbsp;Ajit Subramaniam","doi":"10.1007/s10533-023-01106-y","DOIUrl":"10.1007/s10533-023-01106-y","url":null,"abstract":"","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 1","pages":"97 - 98"},"PeriodicalIF":3.9,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-023-01106-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142412899","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}
引用次数: 0
Influence of contrasting redox conditions on iron (oxyhydr)oxide transformation and associated phosphate sorption 对比氧化还原条件对铁(氧)氧化物转化和伴生磷酸盐吸附的影响
IF 4 3区 环境科学与生态学
Biogeochemistry Pub Date : 2023-11-18 DOI: 10.1007/s10533-023-01094-z
Maximilian Barczok, Chelsea Smith, Nicolle Di Domenico, Lauren Kinsman-Costello, David Singer, Elizabeth Herndon
{"title":"Influence of contrasting redox conditions on iron (oxyhydr)oxide transformation and associated phosphate sorption","authors":"Maximilian Barczok,&nbsp;Chelsea Smith,&nbsp;Nicolle Di Domenico,&nbsp;Lauren Kinsman-Costello,&nbsp;David Singer,&nbsp;Elizabeth Herndon","doi":"10.1007/s10533-023-01094-z","DOIUrl":"10.1007/s10533-023-01094-z","url":null,"abstract":"<div><p>Iron (oxyhydr)oxides strongly adsorb phosphate and limit its bioavailability, but interactions between phosphate and various Fe (oxyhydr)oxides are poorly constrained in natural systems. An in-situ incubation experiment was conducted to explore Fe (oxyhydr)oxide transformation and effects on phosphate sorption in soils with contrasting saturation and redox conditions. Synthetic Fe (oxyhydr)oxides (ferrihydrite, goethite and hematite) were coated onto quartz sand and either pre-sorbed with phosphate or left phosphate-free. The oxide-coated sands were mixed with natural organic matter, enclosed in mesh bags, and buried in and around a vernal pond for up to 12 weeks. Redox conditions were stable and oxic in the upland soils surrounding the vernal pond but largely shifted from Fe reducing to Fe oxidizing in the lowland soils within the vernal pond as it dried during the summer. Iron (oxyhydr)oxides lost more Fe (− 41% ± 10%) and P (− 43 ± 11%) when incubated in the redox-dynamic lowlands compared to the uplands (− 18% ± 5% Fe and − 24 ± 8% P). Averaged across both uplands and lowlands, Fe losses from crystalline goethite and hematite (− 38% ± 6%) were unexpectedly higher than losses from short range ordered ferrihydrite (− 12% ± 10%). We attribute losses of Fe and associated P from goethite and hematite to colloid detachment and dispersion but losses from ferrihydrite to reductive dissolution. Iron losses were partially offset by retention of solubilized Fe as organic-bound Fe(III). Iron (oxyhydr)oxides that persisted during the incubation retained or even gained P, indicating low amounts of phosphate sorption from solution. These results demonstrate that hydrologic variability and Fe (oxyhydr)oxide mineralogy impact Fe mobilization pathways that may regulate phosphate bioavailability.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"166 2","pages":"87 - 107"},"PeriodicalIF":4.0,"publicationDate":"2023-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138292913","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}
引用次数: 0
Herbivores influence biogeochemical processes by altering litter quality and quantity in a subarctic wetland 草食动物通过改变亚北极湿地凋落物的质量和数量影响生物地球化学过程
IF 4 3区 环境科学与生态学
Biogeochemistry Pub Date : 2023-11-14 DOI: 10.1007/s10533-023-01098-9
Taylor Saunders, Jaron Adkins, Karen H. Beard, Trisha B. Atwood, Bonnie G. Waring
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