Effect of Scirpus mariqueter Vegetation on Salt Marsh Benthic Macrofaunal Community of the Changjiang Estuary

2005 ◽  
Vol 211 ◽  
pp. 73-78 ◽  
Author(s):  
Yuan Xingzhong ◽  
Liu Hong ◽  
Lu Jianjian
Keyword(s):  
Salt Marsh ◽  
Changjiang Estuary ◽  
The Changjiang Estuary ◽  
Scirpus Mariqueter ◽  
Macrofaunal Community

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.

A multi-proxy study of sedimentary humic substances in the salt marsh of the Changjiang Estuary, China

2014 ◽  
Vol 151 ◽  
pp. 295-301 ◽  
Author(s):  
Yaoling Zhang ◽  
Jinzhou Du ◽  
Xin Zhao ◽  
Wangsuo Wu ◽  
Bo Peng ◽  
...  
Keyword(s):  
Salt Marsh ◽  
Humic Substances ◽  
Changjiang Estuary ◽  
The Changjiang Estuary

scholarly journals Air–sea CO<sub>2</sub> fluxes in the East China Sea based on multiple-year underway observations

2015 ◽  
Vol 12 (18) ◽  
pp. 5495-5514 ◽  
Author(s):  
X.-H. Guo ◽  
W.-D. Zhai ◽  
M.-H. Dai ◽  
C. Zhang ◽  
Y. Bai ◽  
...  
Keyword(s):  
East China Sea ◽  
Co2 Flux ◽  
Changjiang Estuary ◽  
East China ◽  
The East China Sea ◽  
The Changjiang Estuary ◽  
Data Set ◽  
China Sea ◽  
Fujian Coast ◽  
Partial Pressure Of Co2

Abstract. This study reports the most comprehensive data set thus far of surface seawater pCO2 (partial pressure of CO2) and the associated air–sea CO2 fluxes in a major ocean margin, the East China Sea (ECS), based on 24 surveys conducted in 2006 to 2011. We showed highly dynamic spatial variability in sea surface pCO2 in the ECS except in winter, when it ranged across a narrow band of 330 to 360 μatm. We categorized the ECS into five different domains featuring with different physics and biogeochemistry to better characterize the seasonality of the pCO2 dynamics and to better constrain the CO2 flux. The five domains are (I) the outer Changjiang estuary and Changjiang plume, (II) the Zhejiang–Fujian coast, (III) the northern ECS shelf, (IV) the middle ECS shelf, and (V) the southern ECS shelf. In spring and summer, pCO2 off the Changjiang estuary was as low as < 100 μatm, while it was up to > 400 μatm in autumn. pCO2 along the Zhejiang–Fujian coast was low in spring, summer and winter (300 to 350 μatm) but was relatively high in autumn (> 350 μatm). On the northern ECS shelf, pCO2 in summer and autumn was > 340 μatm in most areas, higher than in winter and spring. On the middle and southern ECS shelf, pCO2 in summer ranged from 380 to 400 μatm, which was higher than in other seasons (< 350 μatm). The area-weighted CO2 flux on the entire ECS shelf was −10.0 ± 2.0 in winter, −11.7 ± 3.6 in spring, −3.5 ± 4.6 in summer and −2.3 ± 3.1 mmol m−2 d−1 in autumn. It is important to note that the standard deviations in these flux ranges mostly reflect the spatial variation in pCO2 rather than the bulk uncertainty. Nevertheless, on an annual basis, the average CO2 influx into the entire ECS shelf was 6.9 ± 4.0 mmol m−2 d−1, about twice the global average in ocean margins.

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