Carbon and Nitrogen Dynamics in Wetland Soils

Reddy, K. R.; Graetz, D. A.

doi:10.1007/978-1-4684-8378-9_26

Cited by 21 publications

(10 citation statements)

References 40 publications

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“…Among studies that have manipulated the TEA pathway through substrate amendments, some report greater rates of carbon mineralization in the presence of NO 3 À compared to methanogenesis (Pallud et al, 2007;Abell et al, 2009) or SO 4 2À compared to methanogenesis (Reddy and Graetz, 1988;Weston et al, 2006;Pallud et al, 2007). However, in a comparison of 10 different wetland soils, D'Angelo and Reddy (1999) did not observe a difference in organic carbon mineralization rates under denitrifying, sulfate-reducing or methanogenic conditions.…”

Section: Introductionmentioning

confidence: 94%

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Electron donors and acceptors influence anaerobic soil organic matter mineralization in tidal marshes

Sutton‐Grier

Keller

Koch

et al. 2011

Soil Biology and Biochemistry

101

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Section: Introductionmentioning

confidence: 94%

“…However, it is unclear whether the terminal step regulates overall rates of anaerobic organic matter mineralization, except for the well known comparison of aerobic and anaerobic processes (e.g., Reddy and Graetz, 1988). The number of previous studies on this topic is limited, and they report equivocal results.…”

Section: Role Of Electron Acceptorsmentioning

confidence: 99%

Electron donors and acceptors influence anaerobic soil organic matter mineralization in tidal marshes

Sutton‐Grier

Keller

Koch

et al. 2011

Soil Biology and Biochemistry

101

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“…The , SO 4 2-to S 2-and the decomposition of organic matter and methane production do not take place [25,43]. Moreover, it was found that in such conditions heavy metals occur in hardly soluble fractions [20,24].…”

Section: Physico-chemical Properties Of Fl Uvial Sedimentsmentioning

confidence: 99%

Physico-Chemical Parameters Determining the Variability of Actually and Potentially Available Fractions of Heavy Metals in Fluvial Sediments of the Middle Odra River

Ibragimow¹,

Walna²,

Siepak³

2013

Archives of Environmental Protection

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Abstract:The occurrence of heavy metals (Cd, Cr, Cu, Ni, Pb, Zn) has been determined in the fl uvial sediment samples collected along three transects in the Middle Odra River (western Poland) with a width of 360 m. The total concentrations of the metals were obtained after HNO 3 microwave digestion and the available fractions of heavy metals were determined by single extraction procedures using two extractants: 0.01M CaCl 2 and 0.05M EDTA. The measurement of physico-chemical parameters was also performed. The determination of total and available fractions of heavy metals, except potential available fractions of Cr, revealed high concentrations of studied elements detected in the sediment samples characterized by high content of coarse and very coarse-grained sand fraction and high content of organic matter. It was found that the concentrations of total and available fractions of metals could increase along with the content of organic matter, Eh values and concentrations of H + . Apart from the above, those concentrations become the lowest, the higher the content of medium grain size fractions is. Furthermore, the amounts of CaCl 2 and EDTA extractable metals increase in the sediments samples characterized by the lowest total and available concentrations of heavy metals.

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“…Generally, an abundant oxygen supply promotes rapid soil organic matter decomposition, whereas a deficiency in oxygen results in a substantially lower decomposition rate (DeBusk et al 2001;Shaffer and Ma 2001), with the carbon mineralization rates in aerobic conditions being as much as three times faster than under anaerobic conditions (DeBusk and Reddy 1998). Thus, the presence of saturated soil conditions that occur in rice-based cropping systems can affect the release rates and patterns of carbon gas emissions from the soil.…”

Section: Introductionmentioning

confidence: 99%

Daily soil surface CO2 flux during non-flooded periods in flood-irrigated rice rotations

Motschenbacher

Brye

Anders³

et al. 2014

Agron. Sustain. Dev.

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Carbon dioxide (CO 2 ) emitted from the soil, as a result of root and microorganism respiration, is a major process in the global carbon cycle. Since CO 2 production is dependent on oxygen availability, prolonged saturated soil conditions in rice (Oryza sativa) can decrease the quantity of soil carbon released in the form of CO 2 over time. At present, a deficiency exists in the scientific literature on soil surface CO 2 flux in well-established, flood-irrigated rice systems, which are flooded for approximately 3 months a year during the rice growth period. Plenty of studies have examined soil surface CO 2 flux in dryland cropping systems and methane emissions in paddy-grown rice, but flood-irrigated rice does not easily fall into either of these categories due to the cyclic nature of seasonal flooding. Therefore, this is the first study to examine daily soil surface CO 2 flux during non-flooded periods in well-established, flood-irrigated rice rotations. For a comprehensive analysis, soil surface CO 2 flux was measured for 2 years on 10 different rice-based rotations, which had been managed using conventional tillage or no-tillage for 10 and 11 years. Rotations included continuous rice and various combinations of rice rotated with soybean (Glycine max), corn (Zea mays), and/or winter wheat (Triticum aestivum) and were located on a silt-loam soil in the Mississippi River Delta region of Arkansas in the USA. Results showed that 7 of the 16 measurement dates differed in daily soil surface CO 2 flux among tillage and/or crop rotations. However, these differences were determined to be from crop maturity, in relation to early-or late-season planting, instead of patterns of long-term flood irrigation. Years that rice was grown reduced the cumulative CO 2 emissions, but substantial differences over time were minimized in rotations with soybean or corn. Findings from this experiment are valuable in the scientific understanding of carbon gas cycling in rice-based cropping systems because the aerobic periods between flooding were evaluated, which is the time period often ignored when examining carbon gas emissions in rice. Overall, this study provides evidence that the commonly used rice-based cropping systems reach a somewhat equilibrium state in daily CO 2 fluxes over time, regardless of the frequency in periodic soil saturation.

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Carbon and Nitrogen Dynamics in Wetland Soils

Cited by 21 publications

References 40 publications

Electron donors and acceptors influence anaerobic soil organic matter mineralization in tidal marshes

Electron donors and acceptors influence anaerobic soil organic matter mineralization in tidal marshes

Physico-Chemical Parameters Determining the Variability of Actually and Potentially Available Fractions of Heavy Metals in Fluvial Sediments of the Middle Odra River

Daily soil surface CO2 flux during non-flooded periods in flood-irrigated rice rotations

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