Predicting the release of mineral nitrogen from hypersaline pond sediments used for brine shrimp Artemia franciscana production in the Mekong Delta

Khôi, Châu Minh; Guong, Vo Thi; Merckx, Roel

doi:10.1016/j.aquaculture.2006.02.075

Cited by 18 publications

(17 citation statements)

References 30 publications

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“…However, the lower accumulated NH 4 + -N in the first 10 incubation days before its increase under 35‰ salinity compared to the other salinity treatments might imply a short-term inhibiting effect before enhancing NH 4 + -N release. Khoi et al [47] also observed that adverse effects of salinity on N mineralization were short-lived, whereas the rate of N mineralization recovered in later stages. Further studies are needed to testify this effect in different wetland soils under different vegetation.…”

Section: Discussionmentioning

confidence: 95%

High Temperature and Salinity Enhance Soil Nitrogen Mineralization in a Tidal Freshwater Marsh

Gao

Bai

et al. 2014

PLoS ONE

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Soil nitrogen (N) mineralization in wetlands is sensitive to various environmental factors. To compare the effects of salinity and temperature on N mineralization, wetland soils from a tidal freshwater marsh locating in the Yellow River Delta was incubated over a 48-d anaerobic incubation period under four salinity concentrations (0, 10, 20 and 35‰) and four temperature levels (10, 20, 30 and 40°C). The results suggested that accumulated ammonium nitrogen (NH4 +-N) increased with increasing incubation time under all salinity concentrations. Higher temperatures and salinities significantly enhanced soil N mineralization except for a short-term (≈10 days) inhibiting effect found under 35‰ salinity. The incubation time, temperature, salinity and their interactions exhibited significant effects on N mineralization (P<0.001) except the interactive effect of salinity and temperature (P>0.05), while temperature exhibited the greatest effect (P<0.001). Meanwhile, N mineralization processes were simulated using both an effective accumulated temperature model and a one-pool model. Both models fit well with the simulation of soil N mineralization process in the coastal freshwater wetlands under a range of 30 to 40°C (R2 = 0.88–0.99, P<0.01). Our results indicated that an enhanced NH4 +-N release with increasing temperature and salinity deriving from the projected global warming could have profound effects on nutrient cycling in coastal wetland ecosystems.

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Section: Discussionmentioning

confidence: 95%

High Temperature and Salinity Enhance Soil Nitrogen Mineralization in a Tidal Freshwater Marsh

Gao

Bai

et al. 2014

PLoS ONE

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“…For one thing, soil water content could affect soil nitrogen dynamics independently, greater soil moisture changed, the higher soil nitrogen mineralization rate did [10]. For another, the interaction of soil water content and salinity could make the change of soil nitrogen dynamics more complexly [17]. Therefore, further research need to focus on the coupling interaction of water and salinity which affect soil nitrogen dynamics.…”

Section: Effects Of Salinity On Nitrogen Dynamicsmentioning

confidence: 99%

“…Rietz and Hayne [16] found that organic matter decomposition was inhibited by increasing salinity which might cause a substantial decline in potentially mineralized nitrogen. However, Khoi et al [17] found that adverse effects of salinity on nitrogen mineralization were short-lived, whereas the rate of nitrogen mineralization recovered in later stages. Therefore, the above contradictory results indicated that further researches should be taken to find out the effects of soil salinity on soil nitrogen mineralization.…”

Section: Introductionmentioning

confidence: 99%

Effect of Salinity on Soil Respiration and Nitrogen Dynamics

Zeng¹,

Xu²,

Wu³

et al. 2013

Ecological Chemistry and Engineering S

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A facility of BaPS (Barometric Process Separation) and indoor incubation experiments were used to determine the effect of soil salinity on soil respiration and nitrogen transformation. The rates of soil respiration, gross nitrification, denitrification, ammonium and nitrate nitrogen concentrations and relevant soil parameters were measured. Results showed that soil respiration and nitrification and denitrification rates were all affected by soil salinity. Furthermore, the effect of soil salinity level on nitrification and denitrification rates had a threshold value (EC1:5 = 1.13 dS/m). When soil salinity level was smaller to this threshold value, the rates of nitrification and denitrification increased with soil salinity while they were reduced when soil salinity level was larger than the threshold value. Moreover, the changing law of soil respiration rate with soil salinity was similar with the nitrification and denitrification rates while the variation tendency was opposite. In addition, the transformation form urea to ammonium and nitrate nitrogen was also reduced with the increase of soil salinity and the reduced effect could be expressed by exponential functions.

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“…Nkrumah et al [42] noted that urea required a significant amount of time to transform into nitrogen, especially in irrigation conditions. In addition, both Gao et al [37] and Khoi et al [21] observed that the adverse effects of salinity on nitrogen mineralization were short-lived, whereas the rate of nitrogen mineralization recovered in later periods. Thus, a long incubation time is necessary in future studies to confirm this aspect.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, when the electrical conductivity (EC) of a soil solution is less than 70 dS·m -1 , ammonium-nitrogen accumulates continuously with mineralization, whereas with increases of the EC of the soil solution, the accumulated ammonium-nitrogen decreased. However, other studies have indicated that the inhibition of nitrogen mineralization by soil salt is temporary [21].…”

Section: Introductionmentioning

confidence: 97%

Nitrogen Transportation and Transformation Under Different Soil Water and Salinity Conditions

Zeng

Huang

et al. 2016

Ecological Chemistry and Engineering S

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Soil nitrogen transportation and transformation are important processes for crop growth and environmental protection, and they are influenced by various environmental factors and human interventions. This study aims to determine the effects of irrigation and soil salinity levels on nitrogen transportation and transformation using two types of experiments: column and incubation. The HYDRUS-1D model and an empirical model were used to simulate the nitrogen transportation and transformation processes. HYDRUS-1D performed well in the simulation of nitrogen transportation and transformation under irrigated conditions (R 2 as high as 0.944 and 0.763 for ammonium and nitrate-nitrogen simulations, respectively). In addition, the empirical model was able to attain accurate estimations for ammonium (R 2 = 0.512-0.977) and nitrate-nitrogen (R 2 = 0.410-0.679) without irrigation. The modelling results indicated that saline soil reduced the rate of urea hydrolysis to ammonium, promoted the longitudinal dispersity of nitrogen and enhanced the adsorption of ammonium-nitrogen. Furthermore, the effects of soil salinity on the nitrification rate were not obviously comparable to the effects of the amount of irrigation water. Without irrigation, the hydrolysis rate of urea to ammonium decreased exponentially with the soil salinity (R 2 = 0.787), although the nitrification coefficient varied with salinity. However, the denitrification coefficient increased linearly with salinity (R 2 = 0.499).

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Predicting the release of mineral nitrogen from hypersaline pond sediments used for brine shrimp Artemia franciscana production in the Mekong Delta

Cited by 18 publications

References 30 publications

High Temperature and Salinity Enhance Soil Nitrogen Mineralization in a Tidal Freshwater Marsh

High Temperature and Salinity Enhance Soil Nitrogen Mineralization in a Tidal Freshwater Marsh

Effect of Salinity on Soil Respiration and Nitrogen Dynamics

Nitrogen Transportation and Transformation Under Different Soil Water and Salinity Conditions

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