2019
DOI: 10.1007/s10021-018-0330-5
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Landscape Evolution of a Fluvial Sediment-Rich Avicennia marina Mangrove Forest: Insights from Seasonal and Inter-annual Surface-Elevation Dynamics

Abstract: Mangrove forests are vulnerable to accelerated sealevel rise associated with climate warming because they occupy a relatively narrow zone on the mid-toupper-intertidal flats. The fate of these ecosystems largely depends on their capacity to accrete sediment at a rate sufficient to maintain their elevation relative to sea level. We investigated the role of biophysical processes and feedbacks controlling surface-elevation dynamics in a fluvial sediment-rich Avicennia marina mangrove forest (New Zealand) at seaso… Show more

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Cited by 33 publications
(43 citation statements)
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“…Surface elevation changes in mangroves depend on hydroperiod, groundwater level, sediment accumulation, suspended sediment concentration, soil compaction, tectonic movements, above-and below-ground biomass production/decomposition, growth of algae and microbial mats and leaf litter and detritus accumulation (Figure 3). Mangroves are able to increase the surface elevation of their underlying substrate through either mineral-sediment accumulation, in-situ production of biomass, or a combination thereof (Krauss et al, 2014;Woodroffe et al, 2016;Swales et al, 2019). Sediments can accumulate in mangrove forests because the sediment carrying capacity of hydrodynamic flows reduces when their velocity reduces due to the enhanced vegetation drag.…”
Section: Persistence: Surface Elevation Changesmentioning
confidence: 99%
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“…Surface elevation changes in mangroves depend on hydroperiod, groundwater level, sediment accumulation, suspended sediment concentration, soil compaction, tectonic movements, above-and below-ground biomass production/decomposition, growth of algae and microbial mats and leaf litter and detritus accumulation (Figure 3). Mangroves are able to increase the surface elevation of their underlying substrate through either mineral-sediment accumulation, in-situ production of biomass, or a combination thereof (Krauss et al, 2014;Woodroffe et al, 2016;Swales et al, 2019). Sediments can accumulate in mangrove forests because the sediment carrying capacity of hydrodynamic flows reduces when their velocity reduces due to the enhanced vegetation drag.…”
Section: Persistence: Surface Elevation Changesmentioning
confidence: 99%
“…SAR also depend on the wave climate (Green and Coco, 2007) and typically reduce, or even become negative (i.e., erosion), with increasing wave energy (Norris et al, 2021). SAR show a large temporal and spatial variability (Van Santen et al, 2007;Smoak et al, 2013;Rogers et al, 2014;Swales et al, 2015Swales et al, , 2019, and vary across mangrove species and tree density (Furukawa and Wolanski, 1996;Krauss et al, 2003;Adame et al, 2010;Huxham et al, 2010;McKee, 2011;Howard et al, 2020). For example, SAR rates varied between 8.3 mm/year (Sonneratia alba) and 11.0 mm/year (Rhizophora spp.)…”
Section: Persistence: Surface Elevation Changesmentioning
confidence: 99%
“…[Equations 10 and 11]. Sediments deposited in the Firth of Thames are smectite clay-rich muds (Swales et al, 2019) that should show a reversible behaviour of swelling during re-submersion through processes of water infiltration (Yong and Warkentin, 1966). One would expect erosion resistance to decrease after immersion because of the increasing W Obs .…”
Section: Discussionmentioning
confidence: 99%
“…175.537054°) on the upper part of an intertidal mudflat in the Firth of Thames, a meso-tidal estuary of~800km 2 in the Waikato region, New Zealand ( Figures 1A and B) (Swales et al, 2015). The intertidal sediments mainly consisted of fine particles of 55-63% silt, 26-38% clay and 7-10% very fine sand, mean grain size (D 50 ) of 6.4-8.9 μm (Nguyen et al, 2019), grain density of 2.65gcm À3 , dry bulk density of 0.38-0.57gcm À3 and OC of 6.4-13% (Nguyen et al, 2019;Swales et al, 2019, also summarized in Roskoden et al, 2019, typical of many mudflats globally (e.g. Bale et al, 2007;Zhang and Yu, 2017).…”
Section: Study Sitementioning
confidence: 99%
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