Sources and distribution of allochthonous organic matter in surface sediment from the Seomjin River to the southern inner shelf of Korea

2017 ◽  
Vol 52 (4) ◽  
pp. 489-499
Author(s):  
Adegoke Olugboyega Badejo ◽  
Sangmin Hyun ◽  
Wonnyon Kim ◽  
Se-Jong Ju ◽  
Bareum Song
Keyword(s):  
Organic Matter ◽  
Surface Sediment ◽  
Allochthonous Organic Matter ◽  
Inner Shelf ◽  
Seomjin River

Particle Size Effects on Concentration of Metals in Lake Erie Bottom Sediments

1984 ◽  
Vol 19 (1) ◽  
pp. 27-36 ◽  
Author(s):  
Alena Mudroch
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Clay Minerals ◽  
Surface Sediment ◽  
Size Effects ◽  
Lake Erie ◽  
Size Fraction ◽  
Mineralogical Composition ◽  
Major Elements ◽  
Sediment Samples

Abstract Surface sediment samples obtained at the offshore and nearshore area of Lake Erie were separated into eight different size fractions ranging from <2 µm to 250 µm. The concentration of major elements (Si, Al, Ca, Mg, K, Na, Fe, Mn and P), metals (Zn, Cu, Cr, Ni, V, Co and Pb) and organic matter was determined together with the mineralogical composition and morphology of the particles in each size fraction. The distribution of the metals in the offshore sediment was bimodal with the majority of the metals divided between the 63 to 250 um size fraction which also contained the highest concentration of organic matter (about 20%) and the <4 µm fraction containing up to 60% of clay minerals. However, the metals in the nearshore sediment were associated mainly with the clay minerals.

Bacterial decomposition of allochthonous organic matter in shallow subtropical lakes

2021 ◽  
Vol 26 (4) ◽  
Author(s):  
Pâmela R. Gayer ◽  
Pablo S. Guimarães ◽  
Edélti F. Albertoni ◽  
Luiz U. Hepp
Keyword(s):  
Organic Matter ◽  
Allochthonous Organic Matter ◽  
Subtropical Lakes ◽  
Bacterial Decomposition

Distribution and source of organic matter in surface sediment from the muddy deposit along the Zhejiang coast, East China Sea

2017 ◽  
Vol 123 (1-2) ◽  
pp. 395-399 ◽  
Author(s):  
Gang Xu ◽  
Jian Liu ◽  
Gang Hu ◽  
Tara N. Jonell ◽  
Lilei Chen
Keyword(s):  
Organic Matter ◽  
East China Sea ◽  
Surface Sediment ◽  
East China ◽  
China Sea

scholarly journals Physio-chemical properties and dynamic of the surface sediment in riparian mangroves along the Tien river, Tien Giang province

2019 ◽  
Vol 2 (5) ◽  
pp. 50-58
Author(s):  
Hung Duc Nguyen ◽  
Ngot Van Pham ◽  
Duy Van Nguyen
Keyword(s):  
Electrical Conductivity ◽  
Organic Matter ◽  
Surface Sediment ◽  
Chemical Properties ◽  
Total Sulfur ◽  
Mean Sea Level ◽  
Factors Affecting ◽  
Sediment Samples ◽  
Mesohaline Zone ◽  
Saturated Extract

This study was conducted to investigate the physio-chemical properties and vertical dynamic of the surface sediment (0–5 cm) in riparian mangroves along the Tien river, Tien Giang province. The distribution of riparian mangroves located from the polyhaline zone (transect S1 and S2) to the mesohaline zone (transect S3 and S4) and the oligohaline zone (transect S5). Three plots (10x10 m) per transect were set based on the elevation of the mangrove floor (cm + mean sea level) and dominant plants. A total of 28 sediment samples were collected in December 2016 and April 2017. Seasonal variation of pH, redox potential (Eh), electrical conductivity of saturated extract (ECse), bulk density, sediment organic matter (SOM) and total sulfur (TS) were measured in accordance with the standard protocols. Seasonal trends of vertical erosion and accumulation were tested by the tracer stick method. The ECse values and TS concentrations were higher in the dry season and in transects closed to the estuary (S1, S2 and S3) but these trends weren’t found for pH, Eh, and SOM. In most of the riparian mangroves along the Tiền river, low elevation (0–50 cm) was one of important factors affecting the Eh and ECse. In the rainy season, major changes in vertical erosion and acumulation have occurred in the transects near the mouth of the river.

scholarly journals Spatial and Seasonal Variations of Sedimentary Organic Matter in a Subtropical Bay: Implication for Human Interventions

2020 ◽  
Vol 17 (4) ◽  
pp. 1362 ◽  
Author(s):  
Xuan Lu ◽  
Fengxia Zhou ◽  
Fajin Chen ◽  
Qibin Lao ◽  
Qingmei Zhu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Surface Sediment ◽  
Seasonal Variations ◽  
Seasonal Changes ◽  
Nitrogen Isotope ◽  
Anthropogenic Influences ◽  
Stable Carbon ◽  
Δ13c And Δ15n ◽  
Carbon And Nitrogen ◽  
Induced Changes

Elemental (total organic carbon (TOC) and total nitrogen (TN)) and stable carbon and nitrogen isotope compositions (δ13C and δ15N, respectively) in the surface sediment of Zhanjiang Bay (ZJB) in spring and summer were measured to study the spatial and seasonal changes of organic matter (OM) and assess the human-induced and environment-induced changes in the area. The OM in the surface sediment of ZJB was a mixture of terrestrial and marine sources, and was dominated by marine OM (54.9% ± 15.2%). Compared to the central ZJB, the channel and coastal ZJB areas had higher δ13C and δ15N values, higher TOC and TN concentrations, and lower TOC/TN ratios, indicating higher primary productivity and higher percentages of marine OM in the latter two subregions. Mariculture activities, sewage inputs, and dredging were responsible for these phenomena. Clear seasonal variations in OM were observed in ZJB. The average proportions of terrestrial OM in summer increased by 10.2% in the ZJB channel and 26.0% in the coastal ZJB area compared with those in spring. Heavy rainfall brought a large amount of terrestrial OM into the channel and coastal ZJB areas, leading to the increase of the terrestrial OM fraction in these two subregions in summer. In summary, anthropogenic influences had a significant influence on the spatial and seasonal variations of sedimentary OM in ZJB.

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