Coastal environmental changes under increasing anthropogenic impacts: an introduction

doi:10.1139/anc-2019-0011

Cited by 3 publications

(2 citation statements)

References 31 publications

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“…The coastal zone features extraordinary dynamic and complex interactions among the natural processes at interfaces between land, ocean, and atmosphere, and this has recently been further complicated by rapidly growing human perturbations (Fan et al, 2019;Syvitski et al, 2009). The coasts have developed into global socioeconomic hubs to accommodate nearly 50% of the world's population on merely 12% of the earth's land surface (Crossland et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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

Lu,

Xiao,

Gao

et al. 2024

Global Change Biology

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Coastal wetlands play an important role in regulating atmospheric carbon dioxide (CO2) concentrations and contribute significantly to climate change mitigation. However, climate change, reclamation, and restoration have been causing substantial changes in coastal wetland areas and carbon exchange in China during recent decades. Here we compiled a carbon flux database consisting of 15 coastal wetland sites to assess the magnitude, patterns, and drivers of carbon fluxes and to compare fluxes among contrasting natural, disturbed, and restored wetlands. The natural coastal wetlands have the average net ecosystem exchange of CO2 (NEE) of −577 g C m−2 year−1, with −821 g C m−2 year−1 for mangrove forests and −430 g C m−2 year−1 for salt marshes. There are pronounced latitudinal patterns for carbon dioxide exchange of natural coastal wetlands: NEE increased whereas gross primary production (GPP) and respiration of ecosystem decreased with increasing latitude. Distinct environmental factors drive annual variations of GPP between mangroves and salt marshes; temperature was the dominant controlling factor in salt marshes, while temperature, precipitation, and solar radiation were co‐dominant in mangroves. Meanwhile, both anthropogenic reclamation and restoration had substantial effects on coastal wetland carbon fluxes, and the effect of the anthropogenic perturbation in mangroves was more extensive than that in salt marshes. Furthermore, from 1980 to 2020, anthropogenic reclamation of China's coastal wetlands caused a carbon loss of ~3720 Gg C, while the mangrove restoration project during the period of 2021–2025 may switch restored coastal wetlands from a carbon source to carbon sink with a net carbon gain of 73 Gg C. The comparison of carbon fluxes among these coastal wetlands can improve our understanding of how anthropogenic perturbation can affect the potentials of coastal blue carbon in China, which has implications for informing conservation and restoration strategies and efforts of coastal wetlands.

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Section: Introductionmentioning

confidence: 99%

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

Lu,

Xiao,

Gao

et al. 2024

Global Change Biology

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“…An estuary is the transition zone between the river and the sea with complex interactions of river runoff, wave, and tide. Estuaries play a key role in transferring terrestrial and marine materials to support typical ecosystems, which are increasingly vulnerable to human influence because of rapid socioeconomic development (Syvitski and Saito 2007;Fan et al 2019;Kuenzer et al 2020;Zhan et al 2020). A variety of human activities can be listed, e.g., dam construction, navigational work and dredging, land reclamation, groundwater extraction, and fossil resource exploitation (Anthony et al 2015;Fan et al 2017Ve et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Impacts of land reclamation projects on hydrodynamics and morphodynamics in the highly altered North Branch of the Changjiang Estuary

Zhang

Fan

Feng

et al. 2022

Anthropocene Coasts

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The estuary is highly dynamic and sensitive to external and internal forcing. We examine a chain reaction of hydrodynamic and morphodynamic responses to a series of land reclamation projects during the period 1997 to 2017 in the North Branch of the Changjiang Estuary through the Digital Elevation Model (DEM) comparison and the numerical simulation by the Finite Volume Community Ocean Model (FVCOM). The results show that tidal amplification was further strengthened by the artificially reduced channel volume in the middle and upper segments of the North Branch due to the implementation of several large-scale land-reclamation projects in the first stage (1997–2007), and the channel siltation in the middle and upper segments was in turn further promoted by the increased tidal flows with flood dominance. In the second stage (2007–2017), tidal amplification was relaxed by the channel narrowing project at the lower segment and the waterway improvement project through channel dredging works at the middle and upper segments. Contemporary erosion volume was almost balanced by the accretion volume in the North Branch because of the weakening dominance of flood over ebb flows. Spatiotemporal variation in channel accretion and erosion patterns in response to estuarine engineering projects was vividly mirrored by the change of simulated bed shear stress in that the areas with increased (decreased) bed shear stress underwent severe erosion (accretion). These findings highlight again the dynamic feature of tide-dominated estuaries and the importance of simulation tools to the estuarine management.

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Reproductive dynamics of an inshore delphinid reflect demographic consequences of large-scale coastal constructions

Chan,

Ho,

Karczmarski

2024

Biological Conservation

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Coastal environmental changes under increasing anthropogenic impacts: an introduction

Cited by 3 publications

References 31 publications

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

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

Impacts of land reclamation projects on hydrodynamics and morphodynamics in the highly altered North Branch of the Changjiang Estuary

Reproductive dynamics of an inshore delphinid reflect demographic consequences of large-scale coastal constructions

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