Jiangsu Engineering Laboratory of Water and Soil Eco Remediation

Nanjing, China

Jiangsu Engineering Laboratory of Water and Soil Eco Remediation

Nanjing, China
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Liu J.-E.,Nanjing Normal University | Liu J.-E.,Jiangsu Engineering Laboratory of Water and Soil Eco remediation | Liu J.-E.,Duke University | Han R.-M.,Nanjing Normal University | And 10 more authors.
Ecological Engineering | Year: 2017

Coastal wetlands soil organic carbon (SOC) plays an important role in global carbon sequestration, and exotic S. alterniflora affects the coastal ecosystem's functions including SOC storage (SOCS). We investigated the vertical deep soil SOC distribution (0–300 cm) in Jiangsu salt marsh and estimated its changes. The results show that (1) exotic S. alterniflora increases the SOC, with higher densities (g kg−1) in both topsoil and deep soil in its colonized area, and subsequently increases the SOCS vertical depth (cm) distribution. Such influences become more prominent with time since the introduction of S. alterniflora. The deepest SOC distribution (180 cm) and the highest SOC content (2.14 ± 0.19 g kg−1) in the deep layer (50–300 cm) were found in the zones where S. salsa – S. alterniflora co-exist (SSI). The vertical SOC distribution in zones where multi-species co-exists is deeper than that in mono-species dominated zones; (2) The deep soil (100–300 cm) SOC accounts more than 50% of 0–300 cm SOC in Jiangsu salt marsh, suggesting that SOC content of deep soil should not be ignored when calculating the global soil carbon stock; (3) Total SOCS within 0–300 cm in Jiangsu salt marshes (107.84 × 106 m2) is 84.90 × 1010 g, of which 0–100 cm, 100–200 cm and 200–300 cm layer accounts for 38.25%, 30.72% and 31.03%, respectively. The size of the SOCS (0–300 cm) in the Jiangsu salt marshes relatively to the global biome (0.36 × 10−6) is in a lower proportion of the range of salt marsh area to global biome area (0.89 × 10−6). The S. alterniflora salt marsh contributes most of the SOCS in the 0–300 cm and 0–100 cm soils. © 2017 Elsevier B.V.


Duan L.,Nanjing Normal University | Duan L.,Jiangsu Engineering Laboratory of Water and Soil Eco Remediation | Wang F.,Nanjing Normal University | Wang F.,Jiangsu Engineering Laboratory of Water and Soil Eco Remediation | And 8 more authors.
Chinese Journal of Environmental Engineering | Year: 2014

Effects of adsorption time, fly ash dosage, pH, adsorption temperature and oscillation frequency on adsorption-removal for sulfonamide were researched, and its adsorption mechanism of fly ash for sulfonamide was simplely studied. The results showed that the adsorption-removal rate increased with the increasing of fly ash dosage. Under the conditions of fly ash dosage of 50 g/L, sulfonamide of 4 mg/L and 150 r/min for 10 min, the adsorption-removal rate of sulfonamide was 92.8%. Its adsorption mechanism for sulfonamide by fly ash fitted second kinetic model, and belonged to monolayer adsorption.


Duan L.-C.,Nanjing Normal University | Duan L.-C.,Jiangsu Engineering Laboratory of Water and Soil Eco remediation | Wang F.-H.,Nanjing Normal University | Wang F.-H.,Jiangsu Engineering Laboratory of Water and Soil Eco remediation | And 8 more authors.
Huanjing Kexue/Environmental Science | Year: 2014

Tetracycline (TC) has been widely used in veterinary medicines and disease treatments, and has been discharged into nature system due to manure application. To know the harmfulness of TC residues, and to investigate the natural attenuation of TC under different environmental conditions, simulated attenuation experiments in the presence of light, sediment, Cd(NO3)2 and Pb(NO3)2 were performed. Results showed that the natural attenuation of TC was not obvious under the sunlight, and the natural attenuation rate of TC in water with unsterilized sediment was greater than that with sterilized sediment. The natural attenuation of TC in water with Pb(NO3)2 was slow at the first stage of the experiment, and progressively speeded up as time went on. However, the natural attenuation of TC in water with Cd(NO3)2 was more rapid at the beginning, and significantly faster than that of Pb(NO3)2. The natural attenuation rates of 0.08 mmol·L-1 TC under different conditions follow the sequence: unsterilized sediment (87.2%)>sterilized sediment (70.37%)>Cd(NO3)2(64.2%)> Pb(NO3)2(32.3%)>blank (6.6%), suggesting that all these factors can promote the natural attenuation of TC. Though the natural attenuation trend under different conditions in the dark is similar to that under the sunlight, the natural attenuation rate is less than that under the sunlight, which implicates that sunlight may promote the natural attenuation of TC.

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