How humans alter dissolved organic matter composition in freshwater: relevance for the Earth’s biogeochemistry

Biogeochemistry, Год журнала: 2021, Номер 154(2), С. 323 - 348

Опубликована: Янв. 25, 2021

Abstract Dissolved organic matter (DOM) is recognized for its importance in freshwater ecosystems, but historical reliance on DOM quantity rather than indicators of composition has led to an incomplete understanding and underestimation role biogeochemical processes. A single sample can be composed tens thousands distinct molecules. Each these unique molecules their own chemical properties reactivity or the environment. Human activities modify recent research uncovered pools laced with human markers footprints. Here we review how land use change, climate nutrient pollution, browning, wildfires, dams change which turn will affect internal processing DOM. We then describe human-modified Drought, cultivated use, eutrophication, driven permafrost thaw, other stressors shift ecosystems increasing relative contribution microbial-like aliphatic components. In contrast, increases precipitation may towards more relatively humic-rich, allochthonous forms These shifts likely have highly contrasting effects carbon outgassing burial, cycles, ecosystem metabolism, metal toxicity, treatments needed produce clean drinking water. deeper links between dynamics help address important future environmental issues, such as transfer contaminants through food webs, alterations nitrogen cycling, impacts water quality, global change.

Язык: Английский

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The impact of land use and land cover changes on the landscape pattern and ecosystem service value in Sanjiangyuan region of the Qinghai-Tibet Plateau

Journal of Environmental Management, Год журнала: 2022, Номер 325, С. 116539 - 116539

Опубликована: Окт. 20, 2022

Язык: Английский

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Multi-Interacting Natural and Anthropogenic Stressors on Freshwater Ecosystems: Their Current Status and Future Prospects for 21st Century

Water, Год журнала: 2024, Номер 16(11), С. 1483 - 1483

Опубликована: Май 23, 2024

The inheritance of historic human-induced disruption and the fierceness its impact change aquatic ecosystems. This work reviews some main stressors on freshwater ecosystems, focusing their effects, threats, risks, protection, conservation, management elements. An overview is provided water protection linked to stressors: solar ultraviolet radiation, thermal pollution, nanoparticles, radioactive salinization, nutrients, sedimentation, drought, extreme floods, fragmentation, pesticides, war terrorism, algal blooms, invasive plants, riparian vegetation, fish. Altogether, these build an exceptionally composite background that are continuously changing ecosystems diminishing or even destroying capability create maintain ongoing natural healthy products essential services humans. Environmental human civilization sustainability cannot exist without proper all over planet; this specific impossible if widespread studied not deeply understood structurally functionally. Without considering each synergisms, Earth’s doomed in terms both quantitative qualitative aspects.

Язык: Английский

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Afforestation driving long‐term surface water browning

Global Change Biology, Год журнала: 2019, Номер 26(3), С. 1390 - 1399

Опубликована: Окт. 31, 2019

Increase in surface water color (browning), caused by rising dissolved organic carbon (DOC) and iron concentrations, has been widely reported studied the last couple of decades. This phenomenon implications to aquatic ecosystem function biogeochemical cycling. While recovery from acidification changes climate-related variables, such as precipitation length growing season, are recognized drivers behind browning, land-use change received less attention. In this study, we include all above factors aim discern their individual combined contribution variation an unprecedentedly long (1940-2016) highly resolved dataset (~20 times per month), a river southern Sweden. Water showed high seasonal variability marked long-term increase, particularly latter half (~1980). Short-term variations were best explained precipitation, with temperature playing secondary role. All explanatory variables (precipitation, temperature, S deposition, change) contributed significantly together predicted 75% color. Long-term was pronounced increase Norway spruce (Picea abies Karst) volume-a measure proxy for buildup soil layers-and atmospheric deposition. When modeling combination highest explaining variability. study highlights importance considering factor browning combining multiple when making predictions DOC.

Язык: Английский

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Ecology and extent of freshwater browning - What we know and what should be studied next in the context of global change

The Science of The Total Environment, Год журнала: 2021, Номер 812, С. 152420 - 152420

Опубликована: Дек. 22, 2021

Water browning or brownification refers to increasing water color, often related dissolved organic matter (DOM) and carbon (DOC) content in freshwaters. Browning has been recognized as a significant physicochemical phenomenon altering boreal lakes, but our understanding of its ecological consequences different freshwater habitats regions is limited. Here, we review the on habitats, food webs aquatic-terrestrial habitat coupling. We examine global trends DOM/DOC, use remote sensing tool investigate from local scales. Studies have focused lakes rivers while seldom addressing effects at catchment scale. Other such small temporary waterbodies overlooked, making study entire network incomplete. While past research investigated response primary producers, aquatic invertebrates fishes, macrophytes, invasive species, understudied. Research without considering fluxes between terrestrial habitats. highlight importance how changes one may cascade another. broader than heretofore concentration region. Overall, propose that future studies improve through following actions: 1) knowledge processes other wetland types rivers, 2) assessing impact multiple scales, 3) examining coupling, 4) expanding scale, 5) using consequences.

Язык: Английский

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A review of long-term change in surface water natural organic matter concentration in the northern hemisphere and the implications for drinking water treatment

The Science of The Total Environment, Год журнала: 2022, Номер 858, С. 159699 - 159699

Опубликована: Окт. 26, 2022

Reduced atmospheric acid deposition has given rise to recovery from acidification – defined as increasing pH, neutralization capacity (ANC), or alkalinity in surface waters. Strong evidence of been reported across North America and Europe, driving chemical responses. The primary responses identified this review were concentration changing character natural organic matter (NOM) towards predominantly hydrophobic nature. NOM also influenced trace metal cycling many browning waters increases Fe Al. Further, climate change other factors (e.g., land use) act concert with reductions contribute widespread will have a more pronounced effect stabilizes. observed water quality trends presented challenges for drinking treatment increased dosing, poor filter operations, formation disinfection by-products) facilities may be under designed result. This comprehensive key research areas addressed, including 1) need monitoring programs larger timescales; consistency measurements) assess impacts on dynamics, 2) better understanding vulnerabilities the transition robust technologies solutions that can adapt drivers quality.

Язык: Английский

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Peatland Dissolved Organic Carbon Export to Surface Waters: Global Significance and Effects of Anthropogenic Disturbance

Geophysical Research Letters, Год журнала: 2022, Номер 49(5)

Опубликована: Март 1, 2022

Abstract Peatlands are key components of the global carbon cycle. We compiled peatland dissolved organic (DOC) export from 62 sites to provide a estimate contribution these ecosystems fluvial fluxes. Despite their modest coverage on land (less than 3%), peatlands contribute at least 91 ± 54 Tg DOC surface waters, and could represent 12% 20% ultimately transferred oceans. Boreal main contributors, with 58% inputs. Tropical 37% fluxes although representing only 13% areas. Temperature is leading factor explaining variability in for natural sites, when it discharge impacted by direct anthropogenic activities. This suggests different trajectories under climate change pressure non–disturbed disturbed reinforces need hydrological restoration worldwide.

Язык: Английский

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Reviewing peatland forestry: Implications and mitigation measures for freshwater ecosystem browning

Forest Ecology and Management, Год журнала: 2023, Номер 531, С. 120776 - 120776

Опубликована: Янв. 13, 2023

Freshwaters of the boreal and temperate regions have experienced increased browning during last decades. Browning, or brownification, is mostly driven by organic carbon (OC) iron concentrations. It can cause detrimental changes in aquatic ecosystems through effects on chemistry, physics ecology. Additionally, impact greenhouse gas emissions, increase costs drinking water treatment weaken recreational value bodies. All these impacts call for means to mitigate excess export humic matter ecosystems. Browning has often been associated with decreased atmospheric sulphur deposition climate change-induced alterations temperature, vegetation hydrological regime catchments. Lately, it attributed land use, especially drainage peatlands forestry purposes afforestation. In this review, we evaluate peatland operations OC leaching assess possible mitigation measures. We reveal that traditional, even-aged forest management clear felling, site preparation ditch cleaning creates hot spots moments carbon-rich runoff due fluctuations hydrology, peat decomposition exposure. Simultaneously, most current protection measures are either ineffective ambiguous retaining OC, a dissolved form. Hence, practices prevent future reduce connectivity essential negative quality impacts. conclude systemic change would be needed formation loading leaching. More research needed, but seems transition towards more natural diverse abundantly applied continuous cover forestry, mixed improved catchment retention restoration could result fewer undesirable Protecting biodiversity counteracting requires integration updated into policies guidelines, as green shift bioeconomy will create an increasing demand sustainable use forests.

Язык: Английский

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Challenges for the Sustainable Management of the Boreal Forest Under Climate Change

Advances in global change research, Год журнала: 2023, Номер unknown, С. 773 - 837

Опубликована: Янв. 1, 2023

Abstract The increasing effects of climate and global change oblige ecosystem-based management to adapt forestry practices deal with uncertainties. Here we provide an overview identify the challenges facing boreal forest under projected future change, including altered natural disturbance regimes, biodiversity loss, increased fragmentation, rapid loss old-growth forests, need develop novel silvicultural approaches. We specifically address subjects previously lacking from framework, e.g., Indigenous communities, social concerns, ecological restoration, impacts on aquatic ecosystems. conclude by providing recommendations for ensuring successful long-term biome change.

Язык: Английский

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Response of ecosystem service values to land use change, 2002–2021

Ecological Indicators, Год журнала: 2024, Номер 160, С. 111947 - 111947

Опубликована: Март 1, 2024

Ecosystems in inland river basins are crucial for maintaining socioeconomic stability arid regions. As a result, an essential tool tracking ecosystem changes is the measurement of service value (ESV). Using land use Aksu River Basin (ARB) from 2002 to 2021 as example, response variations ESV basin was examined. equivalency coefficients values adapted specific Chinese context, nine different types were assessed using Getis-Ord Gi* statistical technique and Spearman rank correlation analysis. The findings revealed that (1) pattern change ARB has changed significantly over past 20 years, with grassland unused being dominant ARB, both accounting more than 74 % total area study area. Changes dynamics pronounced each type, all exhibiting positive dynamics, except land, which exhibited negative dynamics. (2) increased 48.06 billion yuan 52.59 2011 then decreased 49.37 2021. Grassland main ecological showed increasing decreasing trend. (3) There clear geographical temporal variation distribution, hotspots primarily located northern section coldspots dispersed east-central region. (4) Each type's sensitivity index less 1, showing coefficient (VC) had small impact on ESV. Policymakers should be aware significant effects have they take steps modify structure, particularly encourage goals. above discussion will support sustainable development variety ways.

Язык: Английский

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