Effect of alternate aerobic and anaerobic conditions on redox potential, organic matter decomposition and nitrogen loss in a flooded soil

Reddy, K. R.; Patrick, W. H.

doi:10.1016/0038-0717(75)90004-8

Cited by 343 publications

(168 citation statements)

References 10 publications

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“…The simulation results indicated that groundwater head was affected by pressure propagation beyond observation well L25 (25 m distance to the river). This can have an impact on oxidation-reduction conditions in the aquifer due to changes in the redox potential during wetting and drying cycles of the soil (Reddy and Patrick, 1975;Cavanaugh et al, 2006). The relationship between the depth to the groundwater and groundwater composition in observation well L25, sampled during the period May-October 2011, was investigated.…”

Section: Site-specific Implicationsmentioning

confidence: 99%

Modelling hyporheic processes for regulated rivers under transient hydrological and hydrogeological conditions

Siergieiev

Ehlert

Reimann

et al. 2015

Hydrol. Earth Syst. Sci.

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Abstract. Understanding the effects of major hydrogeological controls on hyporheic exchange and bank storage is essential for river water management, groundwater abstraction, restoration and ecosystem sustainability. Analytical models cannot adequately represent complex settings with, for example, transient boundary conditions, varying geometry of surface water-groundwater interface, unsaturated and overland flow, etc. To understand the influence of parameters such as (1) sloping river banks, (2) varying hydraulic conductivity of the riverbed and (3) different river discharge wave scenarios on hyporheic exchange characteristics such as (a) bank storage, (b) return flows and (c) residence time, a 2-D hydrogeological conceptual model and, subsequently, an adequate numerical model were developed. The numerical model was calibrated against observations in the aquifer adjacent to the hydropower-regulated Lule River, northern Sweden, which has predominantly diurnal discharge fluctuations during summer and long-lasting discharge peaks during autumn and winter. Modelling results revealed that bank storage increased with river wave amplitude, wave duration and smaller slope of the river bank, while maximum exchange flux decreased with wave duration. When a homogeneous clogging layer covered the entire river-aquifer interface, hydraulic conductivity positively affected bank storage. The presence of a clogging layer with hydraulic conductivity < 0.001 m d −1 significantly reduced the exchange flows and virtually eliminated bank storage. The bank storage return/fill time ratio was positively related to wave amplitude and the hydraulic conductivity of the interface and negatively to wave duration and bank slope. Discharge oscillations with short duration and small amplitude decreased bank storage and, therefore, the hyporheic exchange, which has implications for solute fluxes, redox conditions and the potential of riverbeds as fish-spawning locations. Based on these results, river regulation strategies can be improved by considering the effect of certain wave event configurations on hyporheic exchange to ensure harmonious hydrogeochemical functioning of the river-aquifer interfaces and related ecosystems.

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Section: Site-specific Implicationsmentioning

confidence: 99%

Modelling hyporheic processes for regulated rivers under transient hydrological and hydrogeological conditions

Siergieiev

Ehlert

Reimann

et al. 2015

Hydrol. Earth Syst. Sci.

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“…A major factor influencing the decline in soil subsidence has been improved water management throughout the EAA. Studies have shown that soil loss due to oxidation is directly related to the redox condition of the soil (Ponnamperuma, 1984;Reddy & Patrick, 1975). Generally, well drained soils oxidize at a faster rate than under flooded or poorly drained conditions.…”

Section: Rational and Justificationmentioning

confidence: 99%

Evidence of Soil Health Benefits of Flooded Rice Compared to Fallow Practice

Bhadha¹,

Khatiwada²,

Salvador³

et al. 2018

SAR

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Flooded rice (Oryza sativa L.) in south Florida is grown commercially in rotation with sugarcane and vegetables. From 2008 to 2018, rice production has doubled. During the spring-summer, nearly 200 km 2 of fallow sugarcane land is available for rice production. In 2017, approximately 113 km 2 of rice were planted in the region. The net value of growing rice as a rotation crop far exceeds its monetary return. This study evaluated soil health parameters before and after rice cultivation and compared them against two other common summer farming practices -fallow fields and flooded-fallow. The soil health parameters that were tested as part of this study included soil pH, bulk density, water holding capacity, cation exchange capacity, organic matter, active carbon and nutrient content. Results indicated an increase in soil pH, and a significant reduction in soil bulk density due to rice cultivation. Water holding capacity increased significantly under all flooded land use practices compared to fallow fields. Cation exchange capacity significantly increased when sugarcane fields were cultivated with rice and ratoon rice, nearly doubled from 58 to 101 cmolc kg -1 . Small, yet significant 3% increase in organic matter was observed when sugarcane fields were cultivated with ratoon rice. Almost 16 g kg -1 of active C is being generated within fallow soils, whereas less than half that under flooded practices, limiting the amount of soil loss via oxidation. Based on the soil health index, rice cultivation and flooded-fallow improved overall soil quality compared to fallow lands.

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“…In a periodically flooded wetland, fluctuating water levels are likely to have significant effects on belowground ecosystem dynamics (Dickson andBroyer 1972, Reddy andPatrick 1975). The waterlogged portion of the soil profile is expected to be quite different chemically and physically from the non-waterlogged portion, and these differences, in turn, should produce varied root decomposition rates.…”

Section: Introductionmentioning

confidence: 99%

Cypress root decomposition in experimental wetland mesocosms

1989

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Two forested wetland mesocosms containing organic soil (a sapric histosol) and cypress seedlings were constructed in the rhizotron facility at the University of Georgia's Savannah River Ecology Laboratory. A different hydroperiod (continuous versus periodic) was designed and implemented for each mesocosm. A vertical litter bag technique was used to measure cypress root decomposition rates in the mesocosms, Rapid leaching losses followed by 6 months o fno mass loss occurred in both mesoco sms. During the final 9 months of the study, roots in the periodically flooded mesocosm began to significantly decompose while those in the continuously flooded mesocosm remained unchanged. Inhibited decay was correlated with reduced redox potential, oxygen, and pH, but the delayed response to changes in these factors suggests that the coupling between root decomposition and the abiotic environment is not tight. The prescence of living cypress roots could explain more rapid decay near the surface of the periodically flooded mesocosm. In general, nutri en ts were higher in concentration and amount in the periodically flooded decomposing roots but lower in the soil water. Net accumulations of N occurred in the periodically flooded roots. These patterns indicate that periodically flooded ecosystems should have more conservative nutrient cycles thancontinuously flooded systems. In general, mesocosms appear to provide a useful experimental approach to the study of belowground ecosystem processes.

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Effect of alternate aerobic and anaerobic conditions on redox potential, organic matter decomposition and nitrogen loss in a flooded soil

Cited by 343 publications

References 10 publications

Modelling hyporheic processes for regulated rivers under transient hydrological and hydrogeological conditions

Modelling hyporheic processes for regulated rivers under transient hydrological and hydrogeological conditions

Evidence of Soil Health Benefits of Flooded Rice Compared to Fallow Practice

Cypress root decomposition in experimental wetland mesocosms

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