China's wetland soil organic carbon pool: New estimation on pool size, change, and trajectory

Global Change Biology, Journal Year: 2023, Volume and Issue: 29(21), P. 6139 - 6156

Published: Aug. 28, 2023

Abstract Robust estimates of wetland soil organic carbon (SOC) pools are critical to understanding dynamics in the global cycle. However, previous were highly variable and uncertain, due likely data sources method used. Here we used machine learning estimate SOC storage their changes over time China's wetlands based on density database, associated geospatial environmental data, recently published maps. We built a database China that contains 809 samples from 181 studies collected last 20 years as presented literature. All extended standardized 1‐m depth, basis relationship between profiles different depths. three methods evaluate robustness estimating China. The results indicated random forest model achieved accurate estimation with R 2 being .65. showed average top 1 m was 25.03 ± 3.11 kg C −2 2000 26.57 3.73 2020, an increase 6.15%. change 4.73 0.58 Pg 4.35 0.61 decrease 8.03%, 13.6% decreased area 189.12 × 10 3 162.8 km despite during same period. accumulation rate 107.5 12.4 g year −1 since no changes. Climate caused variations density, future warming drying climate would lead decreases storage. Estimates under Shared Socioeconomic Pathway 1‐2.6 (low‐carbon emissions) suggested not significantly by 2100, but 5‐8.5 (high‐carbon emissions), it approximately 5.77%. In this study, optimized aspects, including sample extent, method. Our study indicates importance using consistent extent projecting

Language: Английский

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Prioritising plastic pollution research in blue carbon ecosystems: A scientometric overview

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 914, P. 169868 - 169868

Published: Jan. 6, 2024

The Blue Carbon Ecosystems (BCEs) comprising mangroves, saltmarshes, and seagrasses located at the land-ocean interface provide crucial ecosystem services. These ecosystems serve as a natural barrier against transportation of plastic waste from land to ocean, effectively intercepting mitigating pollution in ocean. To gain insights into current state research, uncover key research gaps related BCEs, this study conveyed comprehensive overview using bibliometric, altmetric, literature synthesis approaches. bibliometric analysis revealed significant increase publications addressing particularly since 2018. Geographically, Chinese institutions have made substantial contributions field compared countries regions with extensive BCEs established blue carbon science programs. Furthermore, many studies focused on mangrove ecosystems, while limited attention was given exploring saltmarsh, seagrass, multiple simultaneously. Through systematic analysis, identified four major themes BCE-plastics research: a) trapping by vegetated coastal b) microbial degradation, c) ingestion benthic organisms, d) effects biogeochemistry. Upon synthesising knowledge each theme, we employed perspective lens outline future frameworks, specifically emphasising habitat characteristics Emphasising importance synergistic between science, underscore opportunities progress our understanding reservoirs across their subsequent sequestration mineralisation. Together, outcomes review overarching implications for managing optimising climate mitigation through strategies.

Language: Английский

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Carbon Emissions From Chinese Inland Waters: Current Progress and Future Challenges

Journal of Geophysical Research Biogeosciences, Journal Year: 2024, Volume and Issue: 129(2)

Published: Feb. 1, 2024

Abstract Inland waters are significant emitters of greenhouse gases for the atmosphere and play an important role in global carbon cycle. With a vast land area East Asia spanning broad range climatic conditions, China has large number natural human‐made water bodies. These inland systems importance because their high emission fluxes. Over past decades, experienced unprecedented environmental changes driven by rapid economic development, which have profoundly modified its biogeochemistry associated emissions. This review focuses on dioxide (CO 2 ) methane (CH 4 dynamics from China's response to change. Major drivers CO CH emissions, including aquatic metabolism, hydrological factors, prevailing human impacts, examined. To advance our understanding emissions waters, we further identify several critical knowledge gaps, such as inadequate research headwater streams climate‐sensitive Tibetan Plateau ecosystems. Furthermore, insufficient undergoing extensive interventions (e.g., damming, flow regulation, pollution, farming practices aquaculture ponds) is highlighted. We suggest that future efforts should be made better capture spatiotemporal heterogeneity dissolved concentrations fluxes across well long‐term trends. overcome uncertainties sources current flux estimates, mechanistically understand transport transformation Chinese underlying processes particularly needed.

Language: Английский

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Soil ecoenzyme activities coupled with soil properties and plant biomass strongly influence the variation in soil organic carbon components in semi-arid degraded wetlands

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 922, P. 171361 - 171361

Published: Feb. 29, 2024

Language: Английский

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Carbon fluxes of China's coastal wetlands and impacts of reclamation and restoration

Global Change Biology, Journal Year: 2024, Volume and Issue: 30(4)

Published: April 1, 2024

Abstract Coastal wetlands play an important role in regulating atmospheric carbon dioxide (CO 2 ) concentrations and contribute significantly to climate change mitigation. However, change, reclamation, restoration have been causing substantial changes coastal wetland areas exchange China during recent decades. Here we compiled a flux database consisting of 15 sites assess the magnitude, patterns, drivers fluxes compare among contrasting natural, disturbed, restored wetlands. The natural average net ecosystem CO (NEE) −577 g C m −2 year −1 , with −821 for mangrove forests −430 salt marshes. There are pronounced latitudinal patterns wetlands: NEE increased whereas gross primary production (GPP) respiration decreased increasing latitude. Distinct environmental factors drive annual variations GPP between mangroves marshes; temperature was dominant controlling factor marshes, while temperature, precipitation, solar radiation were co‐dominant mangroves. Meanwhile, both anthropogenic reclamation had effects on fluxes, effect perturbation more extensive than that Furthermore, from 1980 2020, China's caused loss ~3720 Gg C, project period 2021–2025 may switch source sink gain 73 C. comparison these can improve our understanding how affect potentials blue China, which has implications informing conservation strategies efforts

Language: Английский

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Greenhouse gas emission flux (CO2, CH4, N2O) from marine shrimp (Litopenaeus vannamei) monoculture cultures in the Brazilian semi-arid region

Aquaculture, Journal Year: 2024, Volume and Issue: 582, P. 740536 - 740536

Published: Jan. 2, 2024

Language: Английский

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Monitoring wetland plant diversity from space: Progress and perspective

International Journal of Applied Earth Observation and Geoinformation, Journal Year: 2024, Volume and Issue: 130, P. 103943 - 103943

Published: May 28, 2024

Wetlands are the one of ecosystems with highest biodiversity, ecological service functions and carbon storage. Affected by synergistic impacts human activities climate change, global wetland area has decreased 35 % since 1970, far-reaching implications on biodiversity loss. Compared manual ground investigations, remote sensing is considered to be most promising method for monitoring change in order formulate effective conservation strategies due its characteristics non-contact detection, low cost timely. Here we used bibliometric analyze study sites, methods, conclusions shortcomings published papers globally over past 60 years monitoring. We show that distribution wetlands was uneven, mostly concentrated United States, China Northern Europe. Current researches mainly focused coastal, marsh estuarine wetlands, while other (e.g., lake riparian artificial peatlands high-altitude high-latitude peatlands) were still lacking. Overall, 20 platforms sensors used, near infrared shortwave length (780 ∼ 1100 nm) reliable sensitive spectral region. Among various estimation accuracy nonlinear, multi-independent variables, hyperspectral models generally higher than those linear, single-factor multispectral models, respectively. The affected both sampling time plant phenology. Most studies taxonomic within-habitat diversity (α-diversity) single-layer communities (grassland), few paid attentions functional phylogenetic inter-habitat (β-diversity) region (γ-diversity) multi-layer (forest shrubland), biodiversity-ecosystem functioning (BEF) relationships. suggest prospective should strengthen globally. multi-dimensional data mined fused provide new high accuracy. focus scale effects (α, β γ), BEF relationships, environmental gradients.

Language: Английский

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Conversion of earthen aquaculture ponds to integrated mangrove-aquaculture systems significantly reduced the emissions of CH4 and N2O

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 132692 - 132692

Published: Jan. 1, 2025

Language: Английский

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Effects of plant invasion and land use change on soil labile organic carbon in southern China’s coastal wetlands

Soil Ecology Letters, Journal Year: 2025, Volume and Issue: 7(1)

Published: Jan. 22, 2025

Language: Английский

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Methane and nitrous oxide fluxes from reference, restored, and disturbed estuarine wetlands in Pacific Northwest, USA

Ecological Applications, Journal Year: 2025, Volume and Issue: 35(2)

Published: March 1, 2025

Abstract There is substantial interest in restoring tidal wetlands because of their high rates long‐term soil carbon sequestration and other valued ecosystem services. However, these are sometimes net sources greenhouse gases (GHG) that may offset climate cooling potential. GHG fluxes vary widely within across wetlands, so it essential to better understand how key environmental drivers, importantly, land management, affect dynamics. We measured methane (CH 4 ) nitrous oxide (N 2 O) at 26 reference restored wetland sites eight nontidal pastures (mostly diked former wetlands) five estuaries the Pacific Northwest (PNW), USA. 7–8 times over one year assess effects type, management on CH N O fluxes. Linear relationships between drivers were poor, but a machine‐learning approach with boosted regression trees provided strong predictability for based upon surface elevation, water‐table level, salinity. Less important variables groundwater pH, temperature. Under oligohaline conditions, variable very high, salinities above ppt relatively low an annual basis. Fluxes higher marshes wet than marshes, swamps, dry pastures. The model had lower predictive power model, type as most factor, although all types (median zero). Our results indicate estuarine hydrologic gradients driver use impacts largely mediated by varying conditions. In PNW, have salinity, water tables more likely increased emissions benefits until they gain enough elevation through accretion. This study also provides transferrable modeling predict consequences coastal using monitoring data from limited set drivers.

Language: Английский

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