Continual expansion of Spartina alterniflora in the temperate and subtropical coastal zones of China during 1985–2020

International Journal of Applied Earth Observation and Geoinformation, Journal Year: 2023, Volume and Issue: 117, P. 103192 - 103192

Published: Jan. 19, 2023

Biological invasions are considerably altering ecosystem structure and functions, especially in coastal ecosystems that subject to intensive anthropogenic disturbances. Spartina alterniflora has been recognized as the most serious invasive species China, which received considerable attention from government public. There is urgent need control this at regional national scales, but such efforts were impeded by lack of time-series data spread. Here, we assessed pixel- phenology-based algorithm for mapping saltmarshes, applied generate annual saltmarsh maps (30-m spatial resolution) 1985 2020 using time series Landsat 5/7/8 images. The resulting suggest expanding since 1990 with three noticeable phases (rapid, moderate, rapid). Along latitudinal gradient, exhibited a longer invasion history more frequent changes low latitudes. Although human interventions caused decline certain areas, rapid natural spread was primarily responsible its extensive continual invasion. These results provide insights efficiently managing species, enhancing conservation wetlands, promoting sustainability wetlands.

Language: Английский

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Exotic Spartina alterniflora invasion enhances sediment N-loss while reducing N retention in mangrove wetland

Geoderma, Journal Year: 2023, Volume and Issue: 431, P. 116362 - 116362

Published: Jan. 30, 2023

Wide and rapid Spartina alterniflora invasion has threatened the sustainability of coastal wetlands China, a significant impact on sediment biogeochemical cycle. However, effects exotic dissimilatory nitrates (NOx−) reduction processes mechanisms underlying these pathways in mangrove have not been well studied. Here, denitrification (DEN), anaerobic ammonium oxidation (ANA) nitrate to (DNRA) rates, contributions (DEN%, ANA%, DNRA%), associated functional genes (nirS, anammox 16S rRNA nrfA) controlling factors were investigated surface sediments (0–5 cm) communities ecotone Zhangjiang Estuary, China. Significant spatial differences DEN, DNRA, DEN%, DNRA% found among different plant (p < 0.05 for all). DEN is dominant pathway NOx− community (87–89 %) (75–78 %), while (41–51 DNRA (36–51 compete with each other community. Organic matter was most dominating factor rates. Without accounting confounding factors, significantly reduced nitrogen retention index (NIRI), causing large amount (N) loss wetlands. We estimated that increased N-loss (831.09 ± 55.16 t N yr−1) but (783.48 37.73 habitats China within last 40 years (1980–2020). Thus, enhances reducing wetlands, which may threaten buffer function wetland pools protection estuarine ecosystems.

Language: Английский

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Rapid and large changes in coastal wetland structure in China's four major river deltas

Global Change Biology, Journal Year: 2023, Volume and Issue: 29(8), P. 2286 - 2300

Published: Jan. 18, 2023

Coastal wetlands provide essential ecosystem goods and services but are extremely vulnerable to sea-level rise, extreme climate, human activities, especially the coastal in large river deltas, which regarded as "natural recorders" of changes estuarine environments. In addition area (loss or gain) quality (degradation improvement) wetlands, information on wetland structure (e.g., patch size number) also major metrics for restoration biodiversity protection, remain very limited China's four deltas. this study, we quantified spatial-temporal dynamics total (TA) number (PN) with different sizes deltas protected areas (PAs) assessed effects driving factors during 1984-2020. We investigated effectiveness PAs through comparison TA PN before after years were listed Ramsar Sites. found both experienced substantial losses Liaohe River Delta Yellow recent recoveries Yangtze Delta. The had a relatively stable variable trend continually increasing Pearl Furthermore, reduced reclamation, ecological projects, rapid expansion invasive plants great impacts various ways. that effective halting decreasing trends slowing success is being counteracted by soaring exotic plant invasions. Our findings vital government public address challenges restoration, management, sustainability

Language: Английский

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Achievements, challenges, and recommendations for waterbird conservation in China's coastal wetlands

Avian Research, Journal Year: 2023, Volume and Issue: 14, P. 100123 - 100123

Published: Jan. 1, 2023

China's coastal wetlands provide breeding, migration stopover, and wintering habitats for about 230 waterbird species, which is more than a quarter of all waterbirds in the world. Large-scale high intensity human activities have resulted serious loss degradation over past half century, causing population declines many waterbirds. Through literature review expert surveys, this article reviews conservation measures taken recent decades to conserve provides recommendations future action from three aspects: policy administration, habitat management, multiparty participation. Over decades, legislation, regulations plans at national level site-specific interventions been implemented, with notable improvement effectiveness making multi-stakeholder Accordingly, some threats mitigated key sites designated as strictly protected nature reserves. However, critical issues still remain, mostly related such wetland restoration, control invasive Spartina alterniflora, environmental pollution, artificial quality. We highlight that protecting natural tidal improving quality are waterbirds, especially those highly dependent on intertidal wetlands. China has demonstrated strong commitment ecological restoration future, terms both funding policies biodiversity ecosystems. It important supported continuously by science- evidence-based decisions actions.

Language: Английский

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Achieving the Kunming–Montreal global biodiversity targets for blue carbon ecosystems

Nature Reviews Earth & Environment, Journal Year: 2024, Volume and Issue: 5(7), P. 538 - 552

Published: July 2, 2024

Language: Английский

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Spartina alterniflora invasion benefits blue carbon sequestration in China

Science Bulletin, Journal Year: 2024, Volume and Issue: 69(12), P. 1991 - 2000

Published: April 25, 2024

Language: Английский

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Coastal wetland resilience through local, regional and global conservation

Published: Jan. 15, 2025

Coastal wetlands, including tidal marshes, mangrove forests and flats, support the livelihoods of millions people. Understanding resilience coastal wetlands to increasing number intensity anthropogenic threats (such as habitat conversion, pollution, fishing climate change) can inform what conservation actions will be effective. In this Review, we synthesize their through lens scale. Over decades centuries, have unfolded across local, regional global scales, reducing both extent quality wetlands. The existing is driven by quality, which modulated physical conditions sediment supply) ecological species interactions operating from local scales). Protection restoration efforts, however, are often localized focus on future depend an improved understanding resilience, society's enhance different scales. important ecosystems around world under threat. This Review explores multiple drivers change priorities.

Language: Английский

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An evaluating system for wetland ecological risk: Case study in coastal mainland China

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 828, P. 154535 - 154535

Published: March 15, 2022

Language: Английский

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Coastal Marsh Vulnerability to Sea‐Level Rise Is Exacerbated by Plant Species Invasion

Global Change Biology, Journal Year: 2025, Volume and Issue: 31(2)

Published: Feb. 1, 2025

ABSTRACT Coastal salt marshes and their valuable ecosystem services are vulnerable to degradation due rising sea levels, which they can adapt through biogeomorphic feedbacks. However, the invasion of plant species, particularly eco‐engineering species that alter these interactions, may degrade structural integrity functionality marshes, potentially reducing resilience sea‐level rise. Such impacts presently remain poorly understood. Focusing on coastal China, we utilized a coupled model explore effects Spartina alterniflora versus native Suaeda salsa geomorphology, considering different rise tidal scenarios. Our results revealed contributed formation “levee‐basin” geomorphological structure at both landscape scale (from seaward landward zones) local channel fringes marsh interiors). This pattern led prominent depression, in “basin” areas under microtidal conditions, indicating increased vulnerability levels invaded systems. Additionally, proliferation could completely displace . findings emphasize importance controlling safeguard environmental change.

Language: Английский

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Macrofaunal biodiversity and trophic structure varied in response to changing environmental properties along the Spartina alterniflora invasion stages

Marine Pollution Bulletin, Journal Year: 2025, Volume and Issue: 214, P. 117756 - 117756

Published: Feb. 27, 2025

Language: Английский

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