Abstract
Abstract Spartina alterniflora (hereafter S. alterniflora ), an exotic saltmarsh species, was introduced into intertidal flats of China in 1979 for its remarkable utility in hydrodynamic attenuation to protect the coasts. Against a background of national‐scale removal of S. alterniflora along Chinese coasts, it is essential to investigate whether native saltmarsh species could provide a similar coastal protection function as the exotic one, particularly for coasts with great coastal defense pressure. Here, the hydrodynamic turbulence attenuation and sediment capture abilities of the native species Scirpus mariqueter (hereafter S. mariqueter ) and S. alterniflora were compared through in situ observation in a typical macro‐tidal estuary, Hangzhou Bay, China. Our results revealed that the turbulence attenuation by S. mariqueter and S. alterniflora varied with inundation depth and wave‐current interactions. Under wave‐dominated conditions, S. mariqueter had a turbulence dissipation rate of 0.04 J m −4 . This rate increased by approximately one order of magnitude under coupled wave‐current conditions but remained one‐third lower than that of S. alterniflora . Notably, the turbulence dissipation rate of S. mariqueter increased to three times that of S. alterniflora during the emergent stage. Nevertheless, sediment capture by S. mariqueter was only half that of S. alterniflora , primarily attributed to a greater tendency for sediment resuspension. This study suggested that short, flexible native saltmarsh species such as S. mariqueter alone are insufficient to restore the coastal protection capacity lost following the removal of S. alterniflora , necessitating the strategic introduction of other relatively tall and rigid native species to enhance coastal resilience.
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Claims 9
Claim · model-written summary
S. mariqueter turbulence dissipation rate was 0.04 J m −4 under wave-dominated conditions.
- Taxon
- S. mariqueter×Bolboschoenoplectus mariquetere0
- Outcome
- turbulence dissipation ratee0
- Value
- 0.04 J m −4e0
- Qualifier
- Under wave‐dominated conditionse0
Verbatim
e0“Under wave‐dominated conditions, S. mariqueter had a turbulence dissipation rate of 0.04 J m −4”
Claim · model-written summary
S. mariqueter turbulence dissipation rate increased about one order of magnitude under coupled wave-current conditions.
Verbatim
e0“Under wave‐dominated conditions, S. mariqueter had a turbulence dissipation rate of 0.04 J m −4”
e1“This rate increased by approximately one order of magnitude under coupled wave‐current conditions but remained one‐third lower than that of S. alterniflora”
Claim · model-written summary
S. mariqueter turbulence dissipation rate remained one-third lower than that of S. alterniflora.
Verbatim
e0“Under wave‐dominated conditions, S. mariqueter had a turbulence dissipation rate of 0.04 J m −4”
e1“This rate increased by approximately one order of magnitude under coupled wave‐current conditions but remained one‐third lower than that of S. alterniflora”
Claim · model-written summary
During the emergent stage the turbulence dissipation rate of S. mariqueter was three times that of S. alterniflora.
Verbatim
e2“the turbulence dissipation rate of S. mariqueter increased to three times that of S. alterniflora during the emergent stage”
Claim · model-written summary
Sediment capture by S. mariqueter was half that of S. alterniflora.
Verbatim
e3“sediment capture by S. mariqueter was only half that of S. alterniflora”
Claim · model-written summary
Lower sediment capture by S. mariqueter is attributed to greater sediment resuspension.
- Taxon
- S. mariqueter×Bolboschoenoplectus mariquetere3
- Outcome
- sediment capturee3
- Qualifier
- primarily attributed to a greater tendency for sediment resuspensione4
Verbatim
e3“sediment capture by S. mariqueter was only half that of S. alterniflora”
e4“primarily attributed to a greater tendency for sediment resuspension”
Claim · model-written summary
Turbulence attenuation by S. mariqueter and S. alterniflora varied with inundation depth.
- Taxon
- S. mariqueter and S. alterniflora
Sporobolus alterniflorus×Bolboschoenoplectus mariquetere5 - Treatment
- inundation depthe5
- Outcome
- turbulence attenuatione5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“the turbulence attenuation by S. mariqueter and S. alterniflora varied with inundation depth”
Claim · model-written summary
S. mariqueter alone is insufficient to restore the coastal protection capacity lost after removal of S. alterniflora.
- Taxon
- S. mariqueter×Bolboschoenoplectus mariquetere6
- Outcome
- restore the coastal protection capacitye6
- Qualifier
- alone are insufficiente6
Verbatim
e6“short, flexible native saltmarsh species such as S. mariqueter alone are insufficient to restore the coastal protection capacity lost following the removal of S. alterniflora”
Claim · model-written summary
Strategic introduction of other relatively tall and rigid native species is recommended to enhance coastal resilience.
Verbatim
e7“necessitating the strategic introduction of other relatively tall and rigid native species to enhance coastal resilience”