Salinity effects on chlorpyrifos degradation and phosphorus fractionation in reclaimed coastal tideland soils

Yun, Eui-Yong; Ro, Hee‐Myong; Lee, Goontaek; Choi, Woo‐Jung

doi:10.1007/s12303-010-0032-2

Cited by 13 publications

(4 citation statements)

References 39 publications

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“…On the other hand, the Resin‐P contents in sites located in the bare beach (Site I–i, mean content 17.3 mg kg −1 ; Site J–j, mean content 17.7 mg kg −1 ) were higher than those of sites near the river bank (Site A‐C, mean content 9.4–9.7 mg kg −1 ). The results support the view that increasing salinity can increase the soil P availability (Yun, Ro, Lee, & Choi, ).…”

Section: Resultssupporting

confidence: 87%

Forms and vertical distributions of soil phosphorus in newly formed coastal wetlands in the Yellow River Delta estuary

Shao

Meng

et al. 2018

Land Degrad Dev

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To study the forms and vertical distributions of soil phosphorus (P) in a newly formed coastal wetland in the Yellow River Delta estuary, China, two transects from the Yellow River bank to the bare beach that encompassed a variety of vegetation covers were selected for soil sampling and field monitoring. A modified sequential fractionation method was used to partition the soil P, and the related properties were measured. The soils in this newly formed estuarine coastal wetland, only covered by salt-tolerant plant communities, are strongly alkaline (pH 8.4-9.2) with high soil salinity (mean, 6.23‰). The content of total P (Pt) ranged from 548.3 to 728.5 mg kg −1 in these soils. Dil.HCl-P i (extracted with 1 M HCl) was the highest P fraction (mean, 58.1-72.8%), whereas NaHCO 3 -P i was the lowest fraction (mean, 0.4-1.7%) of all the P forms. Vertical distributions showed a surface accumulation of Resin-P. Resin-P, NaHCO 3 -P i , NaOH-P i , and Conc.HCl-P i (extracted with 11.3 M HCl) were positively or negatively correlated with some properties.Attributed to the spatial deposition and hydrology, Dil.HCl-P i presented a poor correlation with Ca. The results also showed some clear differences in the P forms and P availability among vegetation covers. The vegetation cover could modify the soil quality, and Suaeda heteroptera, as the pioneer plant community species, significantly enhanced the freely exchangeable P i and increased P availability, providing important ideas for salt-soil sustainable use.

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Section: Resultssupporting

confidence: 87%

Forms and vertical distributions of soil phosphorus in newly formed coastal wetlands in the Yellow River Delta estuary

Shao

Meng

et al. 2018

Land Degrad Dev

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“…It is important to point out that the electrostatic interactions described above are interactively affected by other environmental parameters (e.g., pH) and soil physicochemical properties like surface area. Work in soils similarly shows high salt concentrations inhibit enzyme activity, but these studies target hypersaline conditions well beyond the range relevant to our study (e.g., Tripathi et al, 2007;Yun et al, 2010;Pan et al, 2013). All these effects are also somewhat dependent on the chemical nature of the C compounds involved.…”

Section: Discussionmentioning

confidence: 89%

“…Most laboratory studies show a detrimental effect of salt on enzyme activity, but these assays use purified enzymes in solution and only a select group of substrates (Das et al, 1997;Fang et al, 2010). Work in soils similarly shows high salt concentrations inhibit enzyme activity, but these studies target hypersaline conditions well beyond the range relevant to our study (e.g., Tripathi et al, 2007;Yun et al, 2010;Pan et al, 2013). The limited reports from wetland soils are inconsistent.…”

Section: Discussionmentioning

confidence: 94%

Salinity affects microbial activity and soil organic matter content in tidal wetlands

Morrissey

Gillespie

Morina

et al. 2014

Global Change Biology

328

162

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Climate change-associated sea level rise is expected to cause saltwater intrusion into many historically freshwater ecosystems. Of particular concern are tidal freshwater wetlands, which perform several important ecological functions including carbon sequestration. To predict the impact of saltwater intrusion in these environments, we must first gain a better understanding of how salinity regulates decomposition in natural systems. This study sampled eight tidal wetlands ranging from freshwater to oligohaline (0-2 ppt) in four rivers near the Chesapeake Bay (Virginia). To help isolate salinity effects, sites were selected to be highly similar in terms of plant community composition and tidal influence. Overall, salinity was found to be strongly negatively correlated with soil organic matter content (OM%) and C : N, but unrelated to the other studied environmental parameters (pH, redox, and above- and below-ground plant biomass). Partial correlation analysis, controlling for these environmental covariates, supported direct effects of salinity on the activity of carbon-degrading extracellular enzymes (β-1, 4-glucosidase, 1, 4-β-cellobiosidase, β-D-xylosidase, and phenol oxidase) as well as alkaline phosphatase, using a per unit OM basis. As enzyme activity is the putative rate-limiting step in decomposition, enhanced activity due to salinity increases could dramatically affect soil OM accumulation. Salinity was also found to be positively related to bacterial abundance (qPCR of the 16S rRNA gene) and tightly linked with community composition (T-RFLP). Furthermore, strong relationships were found between bacterial abundance and/or composition with the activity of specific enzymes (1, 4-β-cellobiosidase, arylsulfatase, alkaline phosphatase, and phenol oxidase) suggesting salinity's impact on decomposition could be due, at least in part, to its effect on the bacterial community. Together, these results indicate that salinity increases microbial decomposition rates in low salinity wetlands, and suggests that these ecosystems may experience decreased soil OM accumulation, accretion, and carbon sequestration rates even with modest levels of saltwater intrusion.

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“…The main dissipation processes for SDZ in this experiment is assumed to be microbial degradation and sequestration. The former, however, should be reduced rather than enhanced in the salt-affected systems 27 , due to higher osmolality outside the cell [52][53][54] . As the soil used for this study originated from a coastal area, we may not fully discount the possibility that some members of the microbial community had been pre-exposed to salinity and thus were capable to adapt to a certain extent to this salinity 55 .…”

Section: Discussionmentioning

confidence: 99%

Salinity-independent dissipation of antibiotics from flooded tropical soil: a microcosm study

Sentek

Braun

et al. 2020

Sci Rep

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River deltas are frequently facing salinity intrusion, thus challenging agricultural production in these areas. One adaption strategy to increasing salinity is shrimp production, which however, heavily relies on antibiotic usage. This study was performed to evaluate the effect of increasing salinity on the dissipation rates of antibiotics in tropical flooded soil systems. For this purpose, paddy top soil from a coastal Vietnamese delta was spiked with selected frequently used antibiotics (sulfadiazine, sulfamethazine, sulfamethoxazole, trimethoprim) and incubated with flood water of different salt concentrations (0, 10, 20 g L −1). Antibiotic concentrations were monitored in water and soil phases over a period of 112 days using liquid chromatography and tandem mass spectrometry. We found that sulfamethazine was the most persistent antibiotic in the flooded soil system (DT 50 = 77 days), followed by sulfadiazine (DT 50 = 53 days), trimethoprim (DT 50 = 3 days) and sulfamethoxazole (DT 50 = 1 days). With the exception of sulfamethoxazole, the apparent distribution coefficient increased significantly (p < 0.05) for all antibiotics in course of the incubation, which indicates an accumulation of antibiotics in soil. On a whole system basis, including soil and water into the assessment, there was no overall salinity effect on the dissipation rates of antibiotics, suggesting that common e-fate models remain valid under varying salinity. Salinity intrusion is a natural phenomenon in coastal ecosystems that becomes particularly relevant in delta regions 1,2. However, synergistic effects with anthropogenic drivers like groundwater overuse, hydro-dam construction, and sea level rise currently exacerbate salinization of deltaic soil and freshwater resources and restrict freshwater related agriculture 2,3. In the Mekong Delta of Vietnam, for instance, salinization has already become a major threat 4. About 1.8 million ha of land are affected by increasing salinity 5 , and the El Niño dry season 2015-2016 damaged up to 240,000 ha of paddy rice fields 6. One approach to adapt to this changing environment is by shifting the freshwater land use systems, like paddy rice, to brackish or saltwater compatible agriculture, such as shrimp production 7. Intensive shrimp production, however, frequently goes along with heavy use of antibiotics 8 , which disseminate in the environment. Accordingly, in shrimp ponds, single substances have already been detected in concentrations of up to 0.82 g kg −1 in pond mud and 2.39 mg L −1 in pond water 9 , thus posing risks for the selection and spread of antibiotic resistances 10. The final fate of antibiotics likely depends on soil order and temperature 11,12 , as well as several physicochemical soil properties affecting sorption rates and dissipation 13,14. Several studies dealt with dissipation rates of antibiotics in soil under field (e.g. 11,15) or laboratory conditions (e.g. 16-18). While field studies reflect natural conditions best, laboratory studies allow to determine the influence of a sin...

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Salinity effects on chlorpyrifos degradation and phosphorus fractionation in reclaimed coastal tideland soils

Cited by 13 publications

References 39 publications

Forms and vertical distributions of soil phosphorus in newly formed coastal wetlands in the Yellow River Delta estuary

Forms and vertical distributions of soil phosphorus in newly formed coastal wetlands in the Yellow River Delta estuary

Salinity affects microbial activity and soil organic matter content in tidal wetlands

Salinity-independent dissipation of antibiotics from flooded tropical soil: a microcosm study

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