Carbon and nitrogen composition and stable isotope as potential indicators of source and fate of organic matter in the salt marsh of the Changjiang Estuary, China

Chemosphere ◽  
2006 ◽  
Vol 65 (2) ◽  
pp. 310-317 ◽  
Author(s):  
Junli Zhou ◽  
Ying Wu ◽  
Jing Zhang ◽  
Qinshu Kang ◽  
Zhengtao Liu
Keyword(s):  
Organic Matter ◽  
Salt Marsh ◽  
Stable Isotope ◽  
Changjiang Estuary ◽  
The Changjiang Estuary ◽  
Carbon And Nitrogen

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

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
Pei Sun Loh ◽  
Chen-Yu Ying ◽  
Hussien Ibrahim Mohammed Alnoor ◽  
Xing-Rui Huang ◽  
Zhang-Hua Lou ◽  
...  
Keyword(s):  
Salt Marsh ◽  
Changjiang Estuary ◽  
Coastal Sediments ◽  
Hangzhou Bay ◽  
Phosphorus Species ◽  
The Changjiang Estuary ◽  
Inorganic P ◽  
Extractable P ◽  
The Mean ◽  
P Sources

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.

scholarly journals Isotopic fractionation of particulate organic matter and its biogeochemical implication in the littoral zone of Lake Taihu, China

2017 ◽  
Vol 76 (10) ◽  
pp. 2690-2697 ◽  
Author(s):  
Yong Niu ◽  
Hui Yu ◽  
Yuan Niu ◽  
Xia Jiang ◽  
Xiaochun Guo ◽  
...  
Keyword(s):  
Organic Matter ◽  
Stable Isotope ◽  
Particulate Organic Matter ◽  
Littoral Zone ◽  
Lake Taihu ◽  
Source Analysis ◽  
Stable Carbon ◽  
Carbon And Nitrogen ◽  
Industrial Enterprises ◽  
River Mouths

Abstract Signatures of stable isotope ratios have previously been used to trace the source and transport of particulate organic matter (POM) in freshwater and marine ecosystems. In this study, water columns were collected at 22 sites in the littoral zone of Lake Taihu in 2014 to investigate the distribution and concentration of nutrients and the stable isotope signatures of POM, and their potential interrelation. Generally, mean concentration of nitrogen forms (NH4+-N) showed substantial variation, probably because they had received large amounts of wastewater from various local industrial enterprises. Source analysis by stable carbon and nitrogen isotopic ratios showed that the main POM sources were phytoplankton. Contrasting correlations were obtained between δ15N and N concentrations in effluent river mouths when compared with influent river mouths. In effluent river mouths, there was a significant positive correlation between δ15N and nitrogen concentration (total nitrogen and ammonia-nitrogen), in contrast with the negative correlation in influent river mouths. According to these results, more factors should be taken into consideration when stable carbon and nitrogen isotopes of POM are used to assess the feeding relationship between consumers and prey, as well as the energy flow pathways that support the lake pelagic food webs.

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