Biogeochemistry of terrestrial soils as influenced by short-term flooding

Campos, Alfredo Borges de; Huang, Chi‐hua; Johnston, Cliff T.

doi:10.1007/s10533-011-9639-2

Cited by 44 publications

(27 citation statements)

References 27 publications

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“…Indeed, the sharp rise in DP concentration followed very closely increases in Mn and NH 4 + (Fig. 8), a pattern consistent with the release of P, N, and Mn from flooded soils under reducing conditions (De-Campos et al, 2012;Patrick and Jugsujinda, 1992).…”

Section: Farm Scalesupporting

confidence: 76%

“…7). Concentrations of Mn and NH 4 + in deeper porewater are presumed to derive from anaerobic dissolution of Mn 4+ compounds and mineralization of organic N, respectively, in part owing to the depletion of O 2 with depth in flooded soils (De‐Campos et al, 2012; Patrick and Jugsujinda, 1992). As a result, the second concentration peak of floodwater Fe and P likely results from anaerobic dissolution of P‐Fe minerals (Sallade and Simms, 1997), which is consistent with the sequential reduction of redox components that serve as electron acceptors (Turner and Patrick, 1968).…”

Section: Resultsmentioning

confidence: 99%

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Spatial Scale and Field Management Affect Patterns of Phosphorus Loss in Cranberry Floodwaters

2016

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Although cranberries ( Ait.) are indigenous to the northeastern United States, phosphorus (P) fertilizer additions and periodic flooding make commercial cranberry a potential source of P to the region's lakes and streams. In this study, we report values of P export in cranberry floodwaters that range from <0.8 to 4.7 kg P ha, generally reflecting differences in the hydrological, edaphic, and management factors underlying soil P transfer to floodwater. The relatively high P loading rate (4.7 P kg P ha) was associated with harvest flooding of organic-rich soils. Periods of winter flooding and the discharge of harvest floodwater from mineral soils resulted in relatively low P loss (<0.8 kg P ha). Increases in concentrations of total dissolved P (DP) and total particulate P (PP) in floodwater as stage decreased below the surface of the cranberry bed were consistent with the transport of dissolved P in soil porewater and mobilization of particulate P in ditches. Variations in floodwater DP, as well as conservative and reactive tracer concentrations, suggested that the processes by which soil P is released to porewater included desorption of near-surface soil P and anaerobic dissolution of iron-P compounds deeper in the soil profile. At the farm scale, concentrations of DP and PP steadily increased over time, presumably because drainage waters from beds farther upgradient had longer contact times with P-rich sources, such as soil porewater and ditch sediments. Overall, the study illustrates the role that scale-dependent processes impart on patterns of P loss in agricultural production systems.

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Section: Farm Scalesupporting

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Spatial Scale and Field Management Affect Patterns of Phosphorus Loss in Cranberry Floodwaters

2016

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“…In this humid tropical forest soil, aerobic and anaerobic heterotrophs both appeared to be effective in degrading the labile substrates enriched 345 in fresh plant litter, while aerobic decomposers were more effective in breaking down the relatively refractory compounds found in SOM, as expected based on the role of O2 in oxidative activity. Similar effects of substrate liability have been reported in marine sediments and wetlands (Hulthe et al, 1998;Kristensen and Holmer, 2001;De-Campos et al, 2012), but rarely in upland soils that often experience oscillation in redox conditions. Interestingly, SOM decomposition rates under anoxic conditions were approximately 65% of that under oxic conditions (i.e., roxygen = 65%), which is higher than the roxygen values 350 prescribed in numerical models (2% -40%; reviewed by Keiluweit et al, 2016).…”

Section: Discussionsupporting

confidence: 68%

Differential effects of redox conditions on the decomposition of litter and soil organic matter

Lin

Campbell

Bhattacharyya

et al. 2020

Preprint

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Abstract. Soil redox conditions exert substantial influence on biogeochemical processes in terrestrial ecosystems. Humid tropical forest soils are often characterized by fluctuating redox dynamics, yet how these dynamics affect patterns in soil versus litter decomposition and associated CO2 fluxes is not well understood. We used a 13C-labeled litter addition to explicitly follow the decomposition of litter-derived vs. native soil-derived organic matter in response to four different soil redox regimes – static oxic or anoxic, and two oscillating treatments – in soil from the Luquillo Experimental Forest, Puerto Rico. We coupled this incubation experiment with high-resolution mass spectrometry to characterize the preferential decomposition of specific classes of organic molecules. CO2 production from litter and soil organic matter (SOM) showed distinctly different responses to redox manipulation. The cumulative production of SOM-derived CO2 was positively correlated with the length of soil exposure to an oxic headspace (r = 0.89, n = 20), whereas cumulative 13C-litter-derived CO2 production was not linked to oxygen availability. The CO2 production rate from litter was highest under static anoxic conditions in the first half of the incubation period, and later dropped to the lowest among all redox treatments. In the consistently anoxic soils, we observed the depletion of more oxidized water-extractable organic matter (especially amino sugars, carbohydrates, and proteins) over time, suggesting that under anaerobic conditions, microbes preferentially used more oxidized litter-derived compounds during the early stages of decomposition. Results from kinetic modeling showed that more frequent anoxic exposure limited the decomposition of a slow-cycling C pool, but not a fast-cycling pool. Overall, our results demonstrate that substrate source – freshly added litter vs. native organic matter – plays an important role in the redox sensitivity of organic matter decomposition. In soil environments that regularly experience redox fluctuations, anaerobic heterotrophs can be surprisingly effective in degrading fresh plant litter.

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“…Compared to nitrate and Mn reduction, which ensue rapidly even at modest moisture contents (Bartlett 1988;Vermes and Myrold 1992;De-Campos et al 2011), the onset of microbial Fe reduction requires prolonged periods of anaerobiosis. Nevertheless, Fe reduction is increasingly recognized as the quantitatively most important anaerobic respiratory pathway in a large range of upland soil ecosystems because of its abundance relative to other TEAs (Schuur and Matson 2001;Miller et al 2001;Chacon et al 2006;Fuss et al 2010;Thompson et al 2011;Hall et al 2013 Nutrients (e.g., N and P)…”

Section: Evidence For Anaerobic Metabolism In Upland Soilsmentioning

confidence: 99%

Are oxygen limitations under recognized regulators of organic carbon turnover in upland soils?

et al. 2016

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Understanding the processes controlling organic matter (OM) stocks in upland soils, and the ability to management them, is crucial for maintaining soil fertility and carbon (C) storage as well as projecting change with time. OM inputs are balanced by the mineralization (oxidation) rate, with the difference determining whether the system is aggrading, degrading or at equilibrium with reference to its C storage. In upland soils, it is well recognized that the rate and extent of OM mineralization is affected by climatic factors (particularly temperature and rainfall) in combination with OM chemistry, mineral-organic associations, and physical protection. Here we examine evidence for the existence of persistent anaerobic microsites in upland soils and their effect on microbially mediated OM mineralization rates. We corroborate long-standing assumptions that residence times of OM tend to be greater in soil domains with limited oxygen supply (aggregates or peds). Moreover, the particularly long residence times of reduced organic compounds (e.g., aliphatics) are consistent with thermodynamic constraints on their oxidation under anaerobic conditions. Incorporating (i) pore length and connectivity governing oxygen diffusion rates (and thus oxygen supply) with (ii) 'hot spots' of microbial OM decomposition (and thus oxygen consumption), and (iii) kinetic and thermodynamic constraints on OM metabolism under anaerobic conditions will thus improve conceptual and numerical models of C cycling in upland soils. We conclude that constraints on microbial metabolism induced by oxygen limitations act as a largely unrecognized and greatly underestimated control on overall rates of C oxidation in upland soils.

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Biogeochemistry of terrestrial soils as influenced by short-term flooding

Cited by 44 publications

References 27 publications

Spatial Scale and Field Management Affect Patterns of Phosphorus Loss in Cranberry Floodwaters

Spatial Scale and Field Management Affect Patterns of Phosphorus Loss in Cranberry Floodwaters

Differential effects of redox conditions on the decomposition of litter and soil organic matter

Are oxygen limitations under recognized regulators of organic carbon turnover in upland soils?

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