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Long-term sediment accretion and nutrient deposition in a tidal marsh of the Delaware Bay
Proceedings of the Academy of Natural Sciences of Philadelphia ( IF 0.5 ) Pub Date : 2020-03-01 , DOI: 10.1635/053.167.0107
David J. Velinsky 1 , Bhanu Paudel 2 , Christopher K. Sommerfield 3
Affiliation  

Long-term sediment accretion and nutrient concentrations were investigated in tidal marsh sediments of the Murderkill River, Delaware. Radionuclides (210Pb and 137Cs), stable isotopes (13C and 15N), organic matter concentrations and nutrient concentrations were measured. Tidal marsh sediment accumulation rates ranged from 0.10 to 0.20 g cm-2 yr-1, and accretion rates ranged from 0.31 to 0.74 cm yr-1. The Carbon (C) to nitrogen (N) ratio (∼24) was higher in the downcore of upstream sites, and a similar C/N ratio was identified in surface sediment cores at the downstream sites. The sediment N concentration in the surface sediments was highest at the upstream sites (mostly ≥1% of N) and decreased downstream. Total nitrogen concentrations were highest from 1910 to 1920 (∼1.5% N), decreased to approximately 0.6% N by 1940, and then remained constant to present. The dominance of the C4 plant Spartina (cordgrass) over C3 plants after the 1940s may be due to an upward movement of saline water associated with hydrologic changes and a rise in relative sea level. Surface sediments in all of the cores have more total phosphorus (TP) than below ground. The downstream site closest to the estuary had an abrupt increase in surface TP (i.e., 0–10 cm). Sediment TP increased slightly from 2003 to present time (i.e., from 0.07 to 0.11% P). Sediment accumulation and accretion rates in the Murderkill River marshes are similar to the accretion rates determined by previous studies in the region.

中文翻译:

特拉华湾潮汐沼泽的长期沉积物堆积和养分沉积

在特拉华州默德基尔河的潮汐沼泽沉积物中研究了长期沉积物积累和养分浓度。测量了放射性核素(210Pb 和 137Cs)、稳定同位素(13C 和 15N)、有机物浓度和营养物浓度。潮汐沼泽沉积物积累速率范围为 0.10 至 0.20 g cm-2 yr-1,沉积速率范围为 0.31 至 0.74 cm yr-1。上游站点下岩心的碳(C)与氮(N)比(~24)较高,并且在下游站点的表层沉积物岩心中发现了相似的C / N比。表层沉积物中的沉积物 N 浓度在上游站点最高(大部分 ≥ 1% N),下游下降。从 1910 年到 1920 年,总氮浓度最高(约 1.5% N),到 1940 年降至约 0.6% N,然后一直保持到现在。1940 年代之后,C4 植物 Spartina (cordgrass) 对 C3 植物的优势可能是由于与水文变化和相对海平面上升相关的咸水向上运动。所有岩心的表层沉积物总磷 (TP) 高于地下。最靠近河口的下游站点的表面 TP 突然增加(即 0-10 厘米)。从 2003 年到现在,沉积物 TP 略有增加(即从 0.07 到 0.11% P)。Murderkill 河沼泽中的沉积物积累和吸积率与该地区先前研究确定的吸积率相似。1940 年代之后,C4 植物 Spartina (cordgrass) 对 C3 植物的优势可能是由于与水文变化和相对海平面上升相关的咸水向上运动。所有岩心的表层沉积物总磷 (TP) 高于地下。最靠近河口的下游站点的表面 TP 突然增加(即 0-10 厘米)。从 2003 年到现在,沉积物 TP 略有增加(即从 0.07 到 0.11% P)。Murderkill 河沼泽中的沉积物积累和吸积率与该地区先前研究确定的吸积率相似。1940 年代之后,C4 植物 Spartina (cordgrass) 对 C3 植物的优势可能是由于与水文变化和相对海平面上升相关的咸水向上运动。所有岩心的表层沉积物总磷 (TP) 高于地下。最靠近河口的下游站点的表面 TP 突然增加(即 0-10 厘米)。从 2003 年到现在,沉积物 TP 略有增加(即从 0.07 到 0.11% P)。Murderkill 河沼泽中的沉积物积累和吸积率与该地区先前研究确定的吸积率相似。从 2003 年到现在,沉积物 TP 略有增加(即从 0.07 到 0.11% P)。Murderkill 河沼泽中的沉积物积累和吸积率与该地区先前研究确定的吸积率相似。从 2003 年到现在,沉积物 TP 略有增加(即从 0.07 到 0.11% P)。Murderkill 河沼泽中的沉积物积累和吸积率与该地区先前研究确定的吸积率相似。
更新日期:2020-03-01
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