Effect of tidal flooding on ecosystem CO2 and CH4 fluxes in a salt marsh in the Yellow River Delta

Wei, Siyu; Chu, Xiaoqing; Song, Weimin; He, Wei; Xia, Jianyang; Wu, Haitao

doi:10.1016/j.ecss.2019.106512

Cited by 21 publications

(17 citation statements)

References 56 publications

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“…Carex lyngbyei were often found throughout both strata and so were not considered unique to one zone. The high marsh species' ranges align approximately with the mean extreme high-water line of estuarine marshes in Clayoquot Sound, while low marsh encompasses elevations between the mean lower high water and the mean extreme highwater lines (Jefferson, 1973, as cited in Deur, 2000Weinmann et al, 1984). This method was verified using detrended correspondence analysis, which showed that vegetation assemblages reflected distinct low and high marsh zones (Hill and Gauch, 1980;Appendix B).…”

Section: Field Samplingmentioning

confidence: 83%

“…We note that, within this system, the partitioning between high and low marsh zones appears very closely linked with associated vegetation. Therefore, vegetation composition was recorded as an indicator of "low" vs. "high" marsh zones (Porter, 1982;Weinmann et al, 1984) around each coring spot. Coring spots were considered low marsh if the species Triglochin maritima, Salicornia spp., Fucus ssp., or Distichlis spicata were present and high marsh if it included Plantago maritima, Deschampsia caespitosa, Grindelia integrifolia, Potentilla anserina, Lysimachia maritima, or Eleocharis ssp.…”

Section: Field Samplingmentioning

confidence: 99%

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Quantification of blue carbon in salt marshes of the Pacific coast of Canada

Chastain

Kohfeld²,

Pellatt³

et al. 2022

Biogeosciences

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Abstract. Tidal salt marshes are known to accumulate “blue carbon” at high rates relative to their surface area, which render these systems among the Earth's most efficient carbon (C) sinks. However, the potential for tidal salt marshes to mitigate global warming remains poorly constrained because of the lack of representative sampling of tidal marshes from around the globe, inadequate areal extent estimations, and inappropriate dating methods for accurately estimating C accumulation rates. Here we provide the first estimates of organic C storage and accumulation rates in salt marshes along the Pacific coast of Canada, within the United Nations Educational, Scientific and Cultural Organization (UNESCO) Clayoquot Sound Biosphere Reserve and Pacific Rim National Park Reserve, a region currently underrepresented in global compilations. Within the context of other sites from the Pacific coast of North America, these young Clayoquot Sound marshes have relatively low C stocks but are accumulating C at rates that are higher than the global average with pronounced differences between high and low marsh habitats. The average C stock calculated during the past 30 years is 54 ± 5 Mg C ha−1 (mean ± standard error), which accounts for 81 % of the C accumulated to the base of the marsh peat layer (67 ± 9 Mg C ha−1). The total C stock is just under one-third of previous global estimates of salt marsh C stocks, likely due to the shallow depth and young age of the marsh. In contrast, the average C accumulation rate (CAR) (184 ± 50 g C m−2 yr−1 to the base of the peat layer) is higher than both CARs from salt marshes along the Pacific coast (112 ± 12 g C m−2 yr−1) and global estimates (91 ± 7 g C m−2 yr−1). This difference was even more pronounced when we considered individual marsh zones: CARs were significantly greater in high marsh (303 ± 45 g C m−2 yr−1) compared to the low marsh sediments (63 ± 6 g C m−2 yr−1), an observation unique to Clayoquot Sound among NE Pacific coast marsh studies. We attribute low CARs in the low marsh zones to shallow-rooting vegetation, reduced terrestrial sediment inputs, negative relative sea level rise in the region, and enhanced erosional processes. Per hectare, CARs in Clayoquot Sound marsh soils are approximately 2–7 times greater than C uptake rates based on net ecosystem productivity in Canadian boreal forests, which highlights their potential importance as C reservoirs and the need to consider their C accumulation capacity as a climate mitigation co-benefit when conserving for other salt marsh ecosystem services.

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Section: Field Samplingmentioning

confidence: 83%

Section: Field Samplingmentioning

confidence: 99%

Quantification of blue carbon in salt marshes of the Pacific coast of Canada

Chastain

Kohfeld²,

Pellatt³

et al. 2022

Biogeosciences

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“…The static chambers consisted of transparent acrylic plastic with three parts: a base frame (30 cm in diameter, 10, 10, 15, 20, 30, 40, 50 cm in height for the seven treatments, respectively), a removable middle box (30 cm in diameter, 100 cm in height) and a removable top box (30 cm in diameter, 100 cm in height). The base frames were installed into the soil to 5 cm depth, with 5 cm of the frame emerging above the water surface (Wei et al 2020), in the center of each plot in May 2018. The removable middle box was only used when the height of the vegetation was higher than 100 cm.…”

Section: Measurements Of Ecosystem Co 2 and Ch 4 Exchangementioning

confidence: 99%

“…S4b), inundation depth (0 cm) significantly increased soil CH 4 fluxes compared to the control due to anaerobic conditions which usually enhance CH 4 production by improving anaerobic decomposition by methanogenic bacteria and limiting CH 4 oxidation in reductive conditions (Kettunen et al 1999). Other studies showed that inundation could have little effect on CH 4 fluxes as the water column can provide a diffusion barrier to the release of CH 4 from the soil or water (Cheng et al 2007;Li et al 2018;Wei et al 2020). Moreover, growth of wetland plants (e.g.…”

Section: Effects Of Inundation Depth On Ecosystem Ch 4 Fluxesmentioning

confidence: 99%

Inundation depth affects ecosystem CO2 and CH4 exchange by changing plant productivity in a freshwater wetland in the Yellow River Estuary

Zhao

Song

et al. 2020

Plant Soil

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Aims Climate change (extreme rainfall) and water management activities have led to variation in hydrological regimes, especially inundation, which may alter the function and structure of wetlands as well as wetlandatmosphere carbon (C) exchange. However, the degree to which different inundation depths (standing water depth above the soil surface) affect ecosystem CH 4 fluxes, ecosystem respiration (R eco ) and net ecosystem CO 2 exchange (NEE) remains uncertain in wetland ecosystems.Methods We conducted a field inundation depth manipulation experiment (no inundation, i.e. only natural precipitation; 0, water-saturated; 5, 10, 20, 30 and 40 cm inundation depth) in a freshwater wetland of the Yellow River Delta, China. The CH 4 fluxes, R eco and NEE were measured with a static chamber technique during the growing seasons (May-October) of 2018 and 2019. Results Inundation depth significantly increased plant shoot density, above-water level leaf area index (WLAI), above-water level plant shoot height (WHeight), aboveground and belowground biomass of

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“…On the one hand, when precipitation is low, coupled with increased air temperatures and evaporation rates, water-soluble salts from the sub-surface groundwater are transported upward through the root zone of plants to the soil surface from capillary rise (Yao and Yang 2010). Salinity stress tends to inhibit photosynthesis and productivity of marsh plants by influencing the leaf chlorophyll content, protein synthesis, and lipid metabolism of marsh plants (Abdul-Aziz et al, 2018, Wei et al, 2020b. Therefore, in many salt marshes, periodic inputs of freshwater from precipitation controls structure and function of their plant communities (Heinsch et al, 2004).…”

Section: Introductionmentioning

confidence: 99%