Sources and distribution of sedimentary organic matter along the Andong salt marsh, Hangzhou Bay

Yuan, Hong-Wei; Chen, Jianfang; Ye, Ying; Lou, Zhanghua; Jin, Aimin; Chen, Xuegang; Jiang, Zhiping; Lin, Yu‐Shih; Chen, Chen‐Tung Arthur; Loh, Pei Sun

doi:10.1016/j.jmarsys.2017.06.001

Cited by 38 publications

(14 citation statements)

References 54 publications

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“…The present study partly supported previous research showing that more AllOC is found closer to the sediment sources and in lower elevations (Middelburg et al 1997, Spohn et al 2013, Hansen et al 2017, Yuan et al 2017). However, while previous studies have shown that the contribution of AllOC to soil OC varies among different zones of tidal marshes (Spohn et al 2013) or across sites and regions (Middelburg et al 1997, Hansen et al 2017, Yuan et al 2017, our study is the first to evaluate geomorphology and land-use effects on the small scale variability in the relative contribution of AllOC to soil OC stocks. Our findings demonstrate that spatial factors such as surface elevation and distance to a sediment source, which have been found to determine the spatial patterns of sediment deposition (Esselink et al 1998, Temmerman et al 2003, Chmura & Hung 2004, also are important factors determining the relative contribution of AllOC to the topsoil OC stocks of salt marshes.…”

Section: Conclusion and Perspectivesupporting

confidence: 92%

Origin of organic carbon in the topsoil of Wadden Sea salt marshes

Mueller¹,

Thi²,

Jensen³

et al. 2019

Mar. Ecol. Prog. Ser.

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Blue carbon ecosystems, including salt marshes, play an important role in the global carbon cycle because of their high efficiency to store soil organic carbon (OC). Few studies focus on the origin of OC stored in salt-marsh soils, which comes from either allochthonous or autochthonous sources. The origin, however, has important implications for carbon crediting approaches because the alternative fate of allochthonous OC (AllOC), i.e. if it had not accumulated in the Blue C ecosystem, is unclear. Here, we assessed the origin of OC in two mainland salt-marsh sites of the European Wadden Sea, analyzing δ 13 C of topsoil (0-5 cm) samples, freshly deposited sediment (allochthonous source), and of above-and belowground biomass of vegetation (autochthonous sources). We tested for effects of geomorphological factors, including elevation and the distance to sediment sources, and of livestock grazing, as the most important land-use form, on the relative contributions of allochthonous versus autochthonous sources to the topsoil OC stock. A negative effect of distance to the creek on the relative contribution of AllOC was found at only one of the two salt marshes, probably 2 due to differences in micro-topography between the two salt marshes. Additionally, the relative contribution of AllOC increased with increasing distance to the marsh edge in areas without livestock-grazing, while it decreased in grazed areas. Our findings demonstrate that spatial factors such as surface elevation and distance to a sediment source, which have been found to determine the spatial patterns of sediment deposition, also are important factors determining the relative contribution of AllOC to topsoil OC stocks of salt marshes. Furthermore, we provide first evidence that livestock-grazing can reduce the relative contribution of AllOC to the soil OC stock. These findings thereby yield important implications for C crediting and land-use management.

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Section: Conclusion and Perspectivesupporting

confidence: 92%

Origin of organic carbon in the topsoil of Wadden Sea salt marshes

Mueller¹,

Thi²,

Jensen³

et al. 2019

Mar. Ecol. Prog. Ser.

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“…The S/V and C/V compositional plot showed that most ratios fall within the range for non-woody angiosperm tissues (Figure 4). These results are inconsistent with other locations in this region such as Changjiang Estuary [10] and salt marsh at the southwest of Hangzhou Bay [36] which had shown predominance of non-woody angiosperm tissues.…”

Section: Sources Of Sedimentary Organic Mattercontrasting

confidence: 99%

Characteristics of Sedimentary Organic Matter and Phosphorus in Minor Rivers Discharging into Zhejiang Coast, China

et al. 2020

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In this study, the spatial distribution of lignin-derived phenols, bulk elemental composition and different phosphorus (P) species in surface sediments along six rivers discharging into Zhejiang coast, Southeast China, were investigated to improve the understanding of the carbon and P dynamics in these small river systems. The Shuang, Jiao, Ximen, Feiyun and Ao Rivers have total organic carbon (TOC) ranging from 0.29% to 2.77% and Λ (total lignin in mg/100 mg TOC) ranging from 0.24 to 4.24; Qiantang River has the lowest Λ (0.08–0.19) but the highest TOC (1.05%–6.46%). Jiao, Ximen, Feiyun and Ao Rivers have mean the total P (TP) and bioavailable P (BAP) of 34 to 124 mg/kg and 29 to 89 mg P/kg, and mean OC/OP molar ratio of 397–917. Qiantang River has the lowest mean TP and BAP of 13 mg P/kg and 7 mg P/kg, and highest OC/OP of 18,753; whereas Shuang River has the highest mean TP and BAP of 645 mg P/kg and 559 mg P/kg, and lowest mean OC/OP of 90. The lowest Λ, TP and BAP, but highest OC/OP, in the Qiantang River could be due to tidal bore causing rapid cycling of carbon and P. Trends of slight decrease in abundance of OC, Λ, TP and BAP, but increasing ratios of vanillic acid to vanillin [(Ad/Al)v], syringic acid to syringaldehyde [(Ad/Al)s] and OC/OP farther downstream of the rivers indicate a continuous decomposition of organic matter during transport along the rivers.

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“…Of this, Ex-P was composed of 14.85-43.19% TP, Fe-P was composed of 6.31%-31.50% of TP, and OP was composed of 2.51-12.86% of TP, indicating that these sediments could be released from the Ex-P and OP fractions by the decomposition of organic matter and from the Fe-P during anoxic conditions. In these study areas, the bioavailable P fraction elucidated by both methods was higher than in other locations, such as the East China Sea, which had 6-32% bioavailable P to TP [12,23]; Sishili Bay, China, which had 26.7-35.5% bioavailable P [15]; the eastern coast of Hainan Island, China, which had 20.3-54.2% bioavailable P [17]; the Caspian Sea, which had a mean of 37.2% bioavailable P [18]. us, based on the results of the present study, the Andong salt marsh and the Changjiang Estuary released P during the decomposition of organic matter and under anoxic conditions, which could be utilised by microorganisms.…”

Section: Resultsmentioning

confidence: 63%

“…Surface sediments were collected from the Changjiang Estuary using a grab sampler that collected samples from the surface to a depth of approximately 5 cm to 10 cm. e locations in the Andong salt marsh and Changjiang Estuary were previously reported in Yuan et al [23]. e sediments were immediately transported to the laboratory.…”

Section: Sediment Sampling and Pretreatmentmentioning

confidence: 99%

Comparative Study on the Elucidation of Sedimentary Phosphorus Species Using Two Methods, the SMT and SEDEX Methods

Loh

Ying

Alnoor

et al. 2020

Journal of Analytical Methods in Chemistry

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Sedimentary phosphorus (P) forms are important representatives of P sources and their bioavailability as well as the potential of sediments to release P in water. In this study, surface sediments along a transect of the Changjiang Estuary and two transects along the Andong salt marsh in the southwest of Hangzhou Bay were subjected to the elucidation of sedimentary P species using the standards, measurements, and testing (SMT) and sequential extraction (SEDEX) methods. The results showed that the mean sedimentary P forms elucidated by the SMT method were as follows: organic P (OP; ∼11–14 mg/kg; ∼30–45% of total P; TP) > apatite P (∼5–15 mg/kg; ∼21–36% TP) > Fe/Al-P (∼8–14 mg/kg; ∼31–34% TP), with inorganic P (IP) composing 54–70% of TP. The mean sedimentary P forms elucidated by the SEDEX method were as follows: authigenic P (∼54–68 mg/kg; ∼41–46% TP) > extractable P (Ex-P; ∼36–53 mg/kg; ∼28–34%) > Fe-P (∼21–27 mg/kg; ∼13–19%) > OP (∼8.7–13 mg/kg; ∼5–8%) > detrital P (De-P; ∼2 mg/kg; ∼1–2% TP), with IP composed of ∼91–94% TP. These results showed that the SEDEX method elucidated higher concentrations of sedimentary P forms as well as the TP from these coastal sediments although the SMT method had the advantage of being more economic and faster. The results of both the SMT and SEDEX methods showed that the Andong salt marsh and Changjiang Estuary sediments had much bioavailable P. The mean percentages of bioavailable P from the SMT and SEDEX methods were ∼64–74% and 52–56% of TP, respectively, indicating that these sediments were prone to release P to the coastal areas.

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Sources and distribution of sedimentary organic matter along the Andong salt marsh, Hangzhou Bay

Cited by 38 publications

References 54 publications

Origin of organic carbon in the topsoil of Wadden Sea salt marshes

Origin of organic carbon in the topsoil of Wadden Sea salt marshes

Characteristics of Sedimentary Organic Matter and Phosphorus in Minor Rivers Discharging into Zhejiang Coast, China

Comparative Study on the Elucidation of Sedimentary Phosphorus Species Using Two Methods, the SMT and SEDEX Methods

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