Biogeochemistry最新文献

{"title":"Soil C:N:P stoichiometric signatures of grasslands differ between tropical and warm temperate climatic zones","authors":"Ángel Héctor Hernández-Romero,&nbsp;Yareni Perroni,&nbsp;Lázaro Rafael Sánchez Velásquez,&nbsp;Sergio Martínez-Hernández,&nbsp;Carlos Héctor Ávila-Bello,&nbsp;Xiaofeng Xu,&nbsp;Lihua Zhang","doi":"10.1007/s10533-024-01143-1","DOIUrl":"10.1007/s10533-024-01143-1","url":null,"abstract":"<div><p>Climate and land management affect nutrient cycling in grassland ecosystems. We aimed to understand whether temperate and tropical grasslands differ in terms of soil organic carbon (SOC), nitrogen (N), and phosphorus (P) concentrations, and their C:N:P stoichiometric ratios in grazed and ungrazed natural grasslands and pastures. For this, we used a meta-analysis approach (1296 records, 241 papers), and regression models to explain the observed patterns in terms of mean annual precipitation (MAP), mean annual temperature (MAT), altitude, and latitude. SOC, N, and P concentrations were higher in temperate regions than in tropical ones, and they negatively correlated with MAT and MAP. The grassland type effect was more significant for tropical regions. In tropical regions, soil C:N ratios were higher in ungrazed than in grazed pastures, and soil N:P ratios in ungrazed sites were higher in pastures than in natural grasslands. Grazing increases soil N and SOC for natural grasslands in temperate regions. Our findings suggest that soil stoichiometric C:N:P stoichiometric signatures in grasslands differed between tropical and temperate regions on a global scale. P is a key element in regulation and restriction on soil C and N cycling in tropical regions but less in the temperate ones. Our findings suggest the direction of effects of grazing or grassland type on C:N:P stoichiometric signature. Since imbalances in soil stoichiometric ratios may have implications for ecosystem functioning, the assessment of these patterns could serve as a valuable tool for management and conservation of grasslands and pastures in both tropical and temperate regions.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 7","pages":"909 - 926"},"PeriodicalIF":3.9,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01143-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140949499","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":"Soil gross N2O emission and uptake under two contrasting agroforestry systems: riparian tree buffer versus alley-cropping tree row","authors":"Jie Luo,&nbsp;Lukas Beule,&nbsp;Guodong Shao,&nbsp;Dan Niu,&nbsp;Edzo Veldkamp,&nbsp;Marife D. Corre","doi":"10.1007/s10533-024-01141-3","DOIUrl":"10.1007/s10533-024-01141-3","url":null,"abstract":"<div><p>In addition to the removal of excess mineral nitrogen (N) via root uptake, trees in agroforestry systems may mitigate negative effects of high N fertilization of adjacent crops by enhancing complete denitrification of excess mineral N aside from root uptake. Presently, little is known about the potential for NO₃⁻ reduction through denitrification (conversion to greenhouse gas N₂O and subsequently to non-reactive N₂) in contrasting agroforestry systems: riparian tree buffer versus tree row of an upland alley-cropping system. Our study aimed to (1) quantify gross N₂O emissions (both N₂O + N₂ emissions) and gross N₂O uptake (N₂O reduction to N₂), and (2) determine their controlling factors. We employed the ¹⁵N₂O pool dilution technique to quantify gross N₂O fluxes from 0 to 5 cm (topsoil) and 40 to 60 cm (subsoil) depths with seasonal field measurements in 2019. The riparian tree buffer exhibited higher topsoil gross N₂O emissions and uptake than the alley-cropping tree row (<i>P</i> &lt; 0.03). Gross N₂O emissions were regulated by N and carbon (C) availabilities and aeration status rather than denitrification gene abundance. Gross N₂O uptake was directly linked to available C and <i>nirK</i> gene abundance. In the subsoil, gross N₂O emission and uptake were low in both agroforestry systems, resulting from low mineral N contents possibly due to N uptake by deep tree roots. Nonetheless, the larger available C and soil moisture in the subsoil of riparian tree buffer than in alley-cropping tree row (<i>P</i> &lt; 0.05) suggest its large potential for N₂O uptake whenever NO₃⁻ is transported to the subsoil.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 6","pages":"871 - 888"},"PeriodicalIF":3.9,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01141-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140949547","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":"Assessing the spatiotemporal variability of dissolved organic matter fluorescence composition in the Lake George, NY watershed","authors":"Aleksandar I. Goranov,&nbsp;Mark W. Swinton,&nbsp;David A. Winkler,&nbsp;Jeremy L. Farrell,&nbsp;Sandra A. Nierzwicki-Bauer,&nbsp;Sasha Wagner","doi":"10.1007/s10533-024-01147-x","DOIUrl":"10.1007/s10533-024-01147-x","url":null,"abstract":"<div><p>Lake George (LG) is a temperate, oligotrophic, medium-sized lake (114 km²) located in northeastern New York State (U.S.). Lakes are highly understudied environments where extensive dissolved organic matter (DOM) processing occurs. With this study we establish the foundation for researching the organic biogeochemistry of the LG watershed, in particular, the numerous tributaries flowing into the lake. Collected were 213 samples from 64 tributaries and 12 lake locations. Some of the tributaries had unique wastewater, agricultural, or wetland influences. We employed fluorescence spectroscopy, a common biogeochemical technique, to characterize the fluorescent DOM (FDOM) component. We developed a parallel factor analysis (PARAFAC) model for the deconvolution of FDOM data allowing to depict six underlying FDOM constituents, which varied in source and biogeochemical reactivity on spatiotemporal scales. Tributary DOM, in comparison to lake DOM, was much more aromatic, of larger molecular weight, more humic, and contained less protein-like material. The distribution of humic and protein-like PARAFAC components was impacted by land-use and wastewater influences. Supporting characterization of the chromophoric DOM (CDOM) and total DOM (on dissolved organic carbon basis) allowed differentiating the influence of wetlands, which could not be depicted by spatiotemporally assessing the variability of PARAFAC components. Temporal assessment revealed minor variabilities in tributary DOM quantity and quality except in cases of point sources such as wastewater treatment facilities. Overall, this primer study establishes baseline understanding of the baseflow levels of DOM constituents in the LG watershed, and more broadly, presents a PARAFAC model for the deconvolution of fluorescence spectra of DOM from temperate and oligotrophic lake watersheds such as LG.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 6","pages":"849 - 870"},"PeriodicalIF":3.9,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01147-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140925193","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":"Contribution of marine macrophytes to pCO2 and DOC variations in human-impacted coastal waters","authors":"Kenta Watanabe,&nbsp;Tatsuki Tokoro,&nbsp;Hirotada Moki,&nbsp;Tomohiro Kuwae","doi":"10.1007/s10533-024-01140-4","DOIUrl":"10.1007/s10533-024-01140-4","url":null,"abstract":"<div><p>Carbon cycles in coastal waters are highly sensitive to human activities and play important roles in global carbon budgets. CO₂ sink–source behavior is regulated by spatiotemporal variations in net biological productivity, but the contribution of macrophyte habitats including macroalgae aquaculture to atmospheric CO₂ removal has not been well quantified. We investigated the variations in the carbonate system and dissolved organic carbon (DOC) in human-impacted macrophyte habitats and analyzed the biogeochemical drivers for the variations of these processes. Cultivated macroalgal metabolism (photosynthesis, respiration, calcification, and DOC release) was quantified by in situ field-bag experiments. Cultivated macroalgae took up dissolved inorganic carbon (DIC) (16.2–439 mmol-C m⁻² day⁻¹) and released DOC (1.2–146 mmol-C m⁻² day⁻¹). We estimated that seagrass beds and macroalgae farming contributed 0.8 and 0.4 mmol-C m⁻² day⁻¹ of the in situ total CO₂ removal (5.7 and 6.7 mmol-C m⁻² day⁻¹, respectively) during their growing period in a semi-enclosed embayment but efficient water exchange (i.e., short residence time) in an open coastal area precluded detection of the contribution of macrophyte habitats to the CO₂ removal. Although hydrological processes, biological metabolism, and organic carbon storage processes would contribute to the net CO₂ sink–source behavior, our analyses distinguished the contribution of macrophytes from other factors. Our findings imply that macroalgae farming, in addition to restoring and creating macrophyte habitats, has potential for atmospheric CO₂ removal.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 6","pages":"831 - 848"},"PeriodicalIF":3.9,"publicationDate":"2024-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01140-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140845105","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":"Has nitrogen availability decreased over much of the land surface in the past century? A model-based analysis","authors":"Peter M. Vitousek,&nbsp;Xiaoyu Cen,&nbsp;Peter M. Groffman","doi":"10.1007/s10533-024-01146-y","DOIUrl":"10.1007/s10533-024-01146-y","url":null,"abstract":"<div><p>A recent publication (Mason et al. in Science 376:261, 2022a) suggested that nitrogen (N) availability has declined as a consequence of multiple ongoing components of anthropogenic global change. This suggestion is controversial, because human alteration of the global N cycle is substantial and has driven much-increased fixation of N globally. We used a simple model that has been validated across a climate gradient in Hawai ‘i to test the possibility of a widespread decline in N availability, the evidence supporting it, and the possible mechanisms underlying it. This analysis showed that a decrease in δ¹⁵N is not sufficient evidence for a decline in N availability, because δ¹⁵N in ecosystems reflects both the isotope ratios in inputs of N to the ecosystem AND fractionation of N isotopes as N cycles, with enrichment of the residual N in the ecosystem caused by greater losses of N by the fractionating pathways that are more important in N-rich sites. However, there is other evidence for declining N availability that is independent of ¹⁵N and that suggests a widespread decline in N availability. We evaluated whether and how components of anthropogenic global change could cause declining N availability. Earlier work had demonstrated that both increases in the variability of precipitation due to climate change and ecosystem-level disturbance could drive uncontrollable losses of N that reduce N availability and could cause persistent N limitation at equilibrium. Here we modelled climate-change-driven increases in temperature and increasing atmospheric concentrations of CO₂. We show that increasing atmospheric CO₂ concentrations can drive non-equilibrium decreases in N availability and cause the development of N limitation, while the effects of increased temperature appear to be relatively small and short-lived. These environmental changes may cause reductions in N availability over the vast areas of Earth that are not affected by high rates of atmospheric deposition and/or N enrichment associated with urban and agricultural land use.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 6","pages":"793 - 806"},"PeriodicalIF":3.9,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01146-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140845627","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":"Bison and cattle grazing increase soil nitrogen cycling in a tallgrass prairie ecosystem","authors":"Nicholas Vega Anguiano,&nbsp;Kiona M. Freeman,&nbsp;Janaye D. Figge,&nbsp;Jaide H. Hawkins,&nbsp;Lydia H. Zeglin","doi":"10.1007/s10533-024-01144-0","DOIUrl":"10.1007/s10533-024-01144-0","url":null,"abstract":"<div><p>Nitrogen (N) is a necessary element of soil fertility and a limiting nutrient in tallgrass prairie but grazers like bison and cattle can also recycle N. Bison and cattle impact the nitrogen (N) cycle by digesting forage that is consumed, and recycled back to the soil in a more available forms stimulating soil microbial N cycling activities. Yet we do not know how both grazers comparatively affect N cycling in tallgrass prairie. Thus, we investigated if bison and cattle had similar impacts on N cycling in annually burned tallgrass prairie relative to ungrazed conditions over a 3-year period (2020–2022) at the Konza Prairie Biological Station. We examined: soil pH, soil water content, mineralized N, nitrification potential, denitrification potential and extracellular enzyme assays. Interannual variability in precipitation controlled soil water and N cycling microbial activities but grazing effects had a stronger influence on N cycling. We found significant differences and increased soil pH, nitrification and denitrification potential and less N limitation in bison vs cattle grazed soils where bison grazed soils exhibited faster N cycling. Differences between the grazers may be attributed to the different management of bison and cattle as both can impact N cycling. Overall, these data provide some evidence that bison and cattle affect N cycling differently at this study site, and improve the ecological understanding of grazer impacts on N cycling dynamics within the tallgrass prairie ecosystem.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 5","pages":"759 - 773"},"PeriodicalIF":3.9,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01144-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140814767","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":"Terrestrial and marine POC export fluxes estimated by 234Th–238U disequilibrium and δ13C measurements in the East China Sea shelf","authors":"Qiangqiang Zhong,&nbsp;Dekun Huang,&nbsp;Qiugui Wang,&nbsp;Jinzhou Du,&nbsp;Fule Zhang,&nbsp;Jing Lin,&nbsp;Tao Yu","doi":"10.1007/s10533-024-01136-0","DOIUrl":"10.1007/s10533-024-01136-0","url":null,"abstract":"<div><p>The use of ²³⁴Th–²³⁸U disequilibrium has been widely employed to estimate the sinking flux of particulate organic carbon (POC) from the upper sea and ocean. Here, the deficits of ²³⁴Th relative to ²³⁸U in the water column and the carbon isotope signature (δ¹³C) of POC in the East China Sea (ECS) Shelf were measured, which was used to distinguish the fraction of marine and terrestrial POC export fluxes. In the ECS Shelf, very strong deficits of ²³⁴Th relative to ²³⁸U were observed throughout the water column, with ²³⁴Th/²³⁸U activity ratios ranging from 0.158 ± 0.045 to 0.904 ± 0.068 (averaging 0.426 ± 0.159). The residence times of particle reactive radionuclide ²³⁴Th (τ_Th–T) in the ECS shelf water varied between 9 and 44 days, which is significantly shorter than that in the continental slope area or the basin area. This phenomenon indicates that there is a more rapid particle scavenging process in the ECS shelf water compared to the continental slope and basin upper water. By applying a two-end-member mixing model based on the δ¹³C, the fraction of terrestrial POC was estimated to be 0 to 74% (mean: 30 ± 22%) and the fraction of marine POC was in the range of 25% to 100% (mean: 70 ± 22%). Fluxes of marine and terrestrial POC settling to the seafloor exhibited significant spatial differences among different stations, ranging from 11 to 129 mmol C/m²/day and from 2.6 to 38 mmol C/m²/day, respectively. The averaged terrestrial POC fluxes in the southern and northern ECS Shelf were similar (~ 21 to 24 mmol C/m²/day), while the marine POC fluxes in the north (86 ± 37 mmol C/m²/day) were approximately four times higher than those in the south (26 ± 20 mmol C/m²/day). Interestingly, the estimated export flux of both marine and terrestrial POC were approximately one order of magnitude higher than the previously reported burial fluxes of POC (ranging from 1.1 ± 0.1 to 11.4 ± 1.1 mmol C/m²/day) in the underlying bottom sediments, indicating that the majority (&gt; 90%) of both terrestrial and marine POC exported from the upper water column are degraded in the sediments of the ECS Shelf. This “carbon missing” phenomenon can greatly be attributed to rapid decomposition by other processes (including microbial reworking, cross-shelf transport, and possible consumption by benthic organisms). Our findings highlight the dynamic nature of carbon cycling in the continental shelf and the need for further research to understand these processes and improve carbon budget assessments.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 6","pages":"807 - 827"},"PeriodicalIF":3.9,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01136-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140808402","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":"Subsidy-stress responses of ecosystem functions along experimental freshwater salinity gradients","authors":"Stephen E. DeVilbiss,&nbsp;Brian D. Badgley,&nbsp;Erin R. Hotchkiss,&nbsp;Meredith K. Steele","doi":"10.1007/s10533-024-01131-5","DOIUrl":"10.1007/s10533-024-01131-5","url":null,"abstract":"<div><p>Human activity is increasing salt concentrations in freshwaters worldwide, but effects of freshwater salinity gradients on biogeochemical cycling are less understood than in saline, brackish, or marine environments. Using controlled microcosm experiments, we characterized (1) short-term (one to five days) biogeochemical responses and (2) water column metabolism along a freshwater salinity gradient of multiple salt types. After one day, microcosms were oxic (4.48–7.40 mg O₂ L⁻¹) but became hypoxic (1.20–3.31 mg L⁻¹) by day five. After one day in oxic conditions, microbial respiration in magnesium-, sodium-, and sea salt-based salinity treatments showed a subsidy-stress response, with respiration increasing by over 100% as salinity increased from 30 to 350–800 µS cm⁻¹. Conversely, respiration consistently increased along a calcium-based salinity gradient, peaking at 1500 µS cm⁻¹. By day five, an inverse subsidy-stress response was observed with elevated respiration at upper or lower ends of the gradient except for the magnesium treatment, which had the lowest respiration at the highest salinity. Calcium- and magnesium-based salinity treatments also caused considerable changes in phosphorus concentrations and C:P and N:P. In a separate experiment, microbial respiration and water column primary production also displayed subsidy-stress responses, but imbalances in effect sizes caused consistently declining net community production with increasing salinity. Collectively, our results establish that short-term exposure to different salt ion concentrations can enhance freshwater biogeochemical cycling at relatively low concentrations and alter resource stoichiometry. Furthermore, the nature of effects of freshwater salinization may also change with oxygen availability.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 5","pages":"743 - 757"},"PeriodicalIF":3.9,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01131-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140651655","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":"Dynamics of methane emissions from northwestern Gulf of Mexico subtropical seagrass meadows","authors":"Hao Yu,&nbsp;Richard Coffin,&nbsp;Hannah Organ","doi":"10.1007/s10533-024-01138-y","DOIUrl":"10.1007/s10533-024-01138-y","url":null,"abstract":"<div><p>While seagrass meadows are perceived to be pertinent blue carbon reservoirs, they also potentially release methane (CH₄) into the atmosphere. Seasonal and diurnal variations in CH₄ emissions from a subtropical hypersaline lagoon dominated by <i>Halodule wrightii</i> in southern Texas, USA, on the northwest coast of the Gulf of Mexico were investigated. Dissolved CH₄ concentrations decreased in the daytime and increased overnight during the diel observation period, which could be explained by photosynthesis and respiration of seagrasses. Photosynthetic oxygen was found to significantly reduce CH₄ emissions from seagrass sediment. Diffusive transport contributed slightly to the release of CH₄ from the sediment to the water column, while plant mediation might be the primary mechanism. The diffusive CH₄ flux at the sea-air interface was 12.3–816.2 µmol/m² d, over the range of the sea-air fluxes previously reported from other seagrass meadows. This was related to relatively higher dissolved CH₄ concentrations (11.6–258.2 nmol/L) in a mostly closed lagoon with restricted water exchange. This study emphasizes seagrass meadows in the subtropical hypersaline lagoon as a source of atmospheric CH₄, providing insights into the interactions between seagrass ecosystems and methane dynamics, with potential implications for seagrass meadow management and conservation efforts.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 5","pages":"723 - 741"},"PeriodicalIF":3.9,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01138-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140642300","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":"Rewet without regret? Nutrient dynamics in fen peat exposed to different rewetting degrees","authors":"Annick van der Laan,&nbsp;Jerry van Dijk,&nbsp;Karin T. Rebel,&nbsp;Martin J. Wassen","doi":"10.1007/s10533-024-01139-x","DOIUrl":"10.1007/s10533-024-01139-x","url":null,"abstract":"<div><p>All over the world, peatlands have been drained, often for agricultural purposes, resulting in CO₂ emissions, soil subsidence and biodiversity loss. To combat these negative effects, drained peatlands are being rewetted, but knowledge of the effects of rewetting on peat biogeochemistry is still incomplete, especially since a variety of rewetting methods and rewetting degrees exists. We conducted a mesocosm experiment in which we exposed 100 intact agricultural fen peat cores (80 cm, 20 cm Ø) to five different water levels (0, 20, 40, 60 cm and variable—surface), two nutrient application levels to mimic continued agricultural use, and two water origins. Over an eight-month period, we harvested above-ground plant biomass five times and sampled pore water at two depths each month. Samples were analysed for nutrients. Our results show increased phosphate and ammonium availability upon fully rewetting (0 cm—surface) and less so under partially rewetted circumstances (20 cm—surface). Above-ground biomass was strongly affected by nutrient application, especially in the high water level treatments. Vegetation was primarily N-limited, and N in the vegetation decreased with increasing water levels, indicating stronger nitrogen limitation upon rewetting. We conclude that nature restoration under fully rewetted conditions will likely be challenging as a result of the large release of nutrients from the system which may also affect surrounding nature areas. Furthermore, we conclude that partial rewetting combined with low-intensity agricultural use can be a solution to slow down the adverse effects of drainage, although this will lead to decreased agricultural production.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 5","pages":"705 - 721"},"PeriodicalIF":3.9,"publicationDate":"2024-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01139-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140622738","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}