scholarly journals Distribution of nitrogen forms in suspended sediments and surface sediments of East Tiaoxi River, upper reaches of Taihu Basin and their influence factors

2017 ◽  
Vol 29 (3) ◽  
pp. 594-603 ◽  
Author(s):  
JIN Jing ◽  
◽  
YUAN Xuyin ◽  
CHEN Shiwen ◽  
LI Zhengyang ◽  
...  
Keyword(s):  
Surface Sediments ◽  
Influence Factors ◽  
Suspended Sediments ◽  
Nitrogen Forms ◽  
Taihu Basin ◽  
Tiaoxi River

scholarly journals Source and flux of POC in a karstic area in the Changjiang River watershed: impacts of reservoirs and extreme drought

2016 ◽  
Vol 13 (12) ◽  
pp. 3687-3699 ◽  
Author(s):  
Hongbing Ji ◽  
Cai Li ◽  
Huaijian Ding ◽  
Yang Gao
Keyword(s):  
Organic Carbon ◽  
Surface Sediments ◽  
Nitrogen Isotopes ◽  
Suspended Sediments ◽  
Extreme Drought ◽  
Changjiang River ◽  
Carbonate Minerals ◽  
The Changjiang River ◽  
Wujiang River ◽  
Tightly Coupled

Abstract. Isotopes of carbon (C) and nitrogen (N) along with C / N ratios of particulate organic carbon (POC) were used to identify source and transformation of organic carbon in the suspended and surface sediments in a typical karstic watershed (the Wujiang River, an important tributary of the Changjiang River). Isotope data for suspended sediments indicate that POC was mainly derived from phytoplankton and C3-dominated soil with an increased contribution of phytoplankton in sites directly affected by the reservoir. In contrast, the POC in surface sediments was mainly derived from C3- and C4-dominated soil with little reservoir influence. The positive correlations of carbon and nitrogen isotopes between suspended and surface sediments indicated that these two carbon pools are tightly coupled. Our conservative estimation suggests that 1.17  ×  1010 g of POC is transported to the Three Gorges Reservoir during the study period in 2013. POC yield in the Wujiang River (0.13 t km−2 yr−1) is much lower than those of large rivers with a high abundance of carbonate minerals. Based on the distribution pattern of POC yield, it is inferred that carbonate minerals (lithology) do not contribute significantly to the riverine POC. The cascade of reservoirs and extreme drought had a significant influence on the POC flux in the Wujiang River.

scholarly journals Comparison of phosphorus fraction distribution and influencing factors of suspended and surface sediments in the Tiaoxi watershed, China

2017 ◽  
Vol 75 (9) ◽  
pp. 2108-2118 ◽  
Author(s):  
Hongmeng Ye ◽  
Xuyin Yuan ◽  
Lei Han ◽  
Heng Yin ◽  
Jing Jin
Keyword(s):  
Surface Sediments ◽  
Anthropogenic Activities ◽  
Principal Component ◽  
Suspended Sediments ◽  
Inorganic Phosphorus ◽  
P Fractions ◽  
Fraction Distribution ◽  
Inorganic P Fractions ◽  
P Fraction ◽  
Major Factors

Suspended and surface sediments from the Tiaoxi watershed, fed by the Xitiaoxi and Dongtiaoxi rivers, were analyzed for total phosphorus (TP) and the inorganic P fractions of loosely adsorbed P that were extractable with NH4Cl (NH4Cl-P), reductant P (BD-P), metal oxide-bound P extractable with NaOH (NaOH-P), and calcium-bound, HCl-extractable P (HCl-P), while other physicochemical compositions were also determined. The spatial variations of P fractions in these sediments were investigated, and the major factors influencing the various fractions were explored by multivariate statistics. Compared to surface sediments, suspended sediments contained considerably higher concentrations of total nitrogen, TP, organic matter, Al, Fe, Mn and biologically available P (BAP, given as NH4Cl-P, BD-P and NaOH-P combined) and lower concentrations of Si, Ca and HCl-P in the studied catchments. Dongtiaoxi sediments had higher TP, inorganic phosphorus and HCl-P concentrations and a lower BAP content compared with Xitiaoxi sediments, trends that were associated with local geological backgrounds, landscapes and anthropogenic characteristics. The results of principal component analysis showed different effects of sediment properties on P fraction distributions for Xitiaoxi and Dongtiaoxi sediments. The sediment components and structure exert a strong influence on BAP in Xitiaoxi sediments, in contrast to Dongtiaoxi sediments, where P fractions are mainly affected by urbanization and other anthropogenic activities such as shipping.

PAES and PAHs in the surface sediments of the East China Sea: Occurrence, distribution and influence factors

2020 ◽  
Vol 703 ◽  
pp. 134763 ◽  
Author(s):  
Xiangai Zhao ◽  
Haiyan Jin ◽  
Zhongqiang Ji ◽  
Donghao Li ◽  
Han Yeong Kaw ◽  
...  
Keyword(s):  
East China Sea ◽  
Surface Sediments ◽  
Influence Factors ◽  
East China ◽  
The East China Sea ◽  
China Sea

Distribution of nitrogen forms in surface sediments of lakes from different regions, China

2013 ◽  
Vol 71 (5) ◽  
pp. 2167-2175 ◽  
Author(s):  
Shouliang Huo ◽  
Jingtian Zhang ◽  
Beidou Xi ◽  
Fengyu Zan ◽  
Jing Su ◽  
...  
Keyword(s):  
Surface Sediments ◽  
Nitrogen Forms

Comprehensive Assessment of Heavy Metal Contamination in Surface Sediments from the Inflow Rivers of Taihu Basin

2015 ◽  
Vol 43 (12) ◽  
pp. 1582-1591 ◽  
Author(s):  
Ying Cai ◽  
Wenguang Zhang ◽  
Meichun Zhou ◽  
Hao Jiang ◽  
Delin Xu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Contamination ◽  
Surface Sediments ◽  
Heavy Metal Contamination ◽  
Comprehensive Assessment ◽  
Taihu Basin

Characteristics of nitrogen forms in the surface sediments of southwestern Nansha Trough, South China Sea

2008 ◽  
Vol 26 (3) ◽  
pp. 280-288 ◽  
Author(s):  
Guoxia Zheng ◽  
Jinming Song ◽  
Yunming Sun ◽  
Jicui Dai ◽  
Peng Zhang
Keyword(s):  
South China Sea ◽  
South China ◽  
Surface Sediments ◽  
Nitrogen Forms ◽  
China Sea

Effect of Point and Diffuse Source Loadings on Mercury Concentrations in the Wabigoon River: Evidence of a Seasonally Varying Sediment–Water Partition

1986 ◽  
Vol 43 (7) ◽  
pp. 1426-1444 ◽  
Author(s):  
J. W. Parks ◽  
J. A. Sutton ◽  
A. Lutz
Keyword(s):  
Suspended Solids ◽  
Surface Sediments ◽  
Suspended Sediments ◽  
Mean Value ◽  
Control Site ◽  
Diffuse Source ◽  
Order Of Magnitude ◽  
Summer Temperatures ◽  
High Flows ◽  
The Mean

Ten years after major mercury loadings from a chlor-alkalai plant were sharply reduced, mercury levels in the surface sediments, water, and suspended sediments of the Wabigoon River downstream of Dryden, Ontario, remain markedly elevated. During 1979, a typical water year, average mercury concentrations in water throughout an 80-km reach were nearly five times the mean value at the control site. Elevated mercury levels in the Wabigoon River are primarily due to the chemical and biological remobilization of mercury from sediments. Lesser amounts are due to the erosion of mercury-enriched sediments during high flows and to current releases from the mill site at Dryden. In the absence of resuspended sediment during high flows, mercury levels in contaminated waters can be best described by a sediment – water – suspended solids partition. This condition was established within half a day in the most contaminated portion of the system. Mercury concentrations in water can fluctuate seasonally by an order of magnitude. Highest concentrations were associated with elevated summer temperatures.

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