Soil carbon characterization in a subtropical drained peatland

Rodrı́guez, A.; Gerber, Stefan; Inglett, Patrick W.; Tran, Nhi; Long, Joanna; Daroub, Samira H.

doi:10.1016/j.geoderma.2020.114758

Cited by 19 publications

(9 citation statements)

References 60 publications

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“…Leiber-Sauheitl et al ( 2014) also found similar rates of greenhouse gas emissions from organic soils with different organic and mineral C content in a drained peatland. In the EAA, shallow soils have lower organic matter and recalcitrant C compared with deep soils (Rodriguez et al, 2021), which was also the case in the farms used for this study (Table 1). However, these differences did not produce distinct annual CO 2 emissions in this study, possibly because shallow soils still have considerable high organic matter and organic C content.…”

Section: Co 2 Emissionsmentioning

confidence: 54%

“…In our study the depth of the soil was the same for both soils (30 cm), and no significant differences in CO 2 emissions were found, indicating that both shallow and deep soils are oxidizing at the same rate. Proximity to the bedrock in EAA soils increases inorganic C. However, this C pool comprises on average <1% of TC (Rodriguez et al., 2021); therefore, even though inorganic C appears to be higher in shallow soils (Table 1), this does not translate into lower oxidation rates. Under continuing subsidence, challenges related to drainage and high pH due to the proximity of the bedrock will be more severe in shallow soils.…”

Section: Discussionmentioning

confidence: 99%

“…The exclusion of vegetation in this study allows us to quantify the potential releases of greenhouse gases and N and C leaching due exclusively to soil oxidation. The EAA peats are enriched in recalcitrant C, with 85% of their TC belonging to this C pool (Rodriguez et al., 2021). This might partly explain the lower oxidation rates compared with other drained peatlands.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore the main source of N 2 O emissions is N mineralization, which is followed by nitrification and denitrification; both of these processes release N 2 O either as an intermediate byproduct (nitrification) or as a final product (denitrification) (Reddy & DeLaune, 2008). In the EAA peats, N 2 O emissions have been found to be limited by labile C (Hu et al, 2016;Miller et al, 2012), which can be reduced due to intensive farming (Hu et al, 2016;Rodriguez et al, 2021), and to be correlated with CO 2 emissions (Hu et al, 2017). After drainage of the summer flooded treatment, enhanced mineralization along with high moisture content favored high N 2 O emissions.…”

Section: Ch 4 and N 2 O Emissionsmentioning

confidence: 99%

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Water management effect on soil oxidation, greenhouse gas emissions, and nitrogen leaching in drained peat soils

Rodrı́guez

Daroub

Gerber

et al. 2021

Soil Science Soc of Amer J

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Soil subsidence of peatlands occurs worldwide due to drainage. The Everglades Agricultural Area (EAA), located in South Florida, has been drained for agriculture since 1914, with subsidence resulting in shallow soils in certain areas. The purpose of this study is to determine the impact of water management strategies on soil oxidation and N release as affected by differences in proximity to the bedrock. Oxidation rates (CO 2 efflux), as well as CH 4 and N 2 O emissions, were measured in lysimeters filled with shallow and deep peat subjected to four water treatments. Additionally, NO 3 -N, NH 4 -N, soluble organic N, and dissolved organic C were measured in leachate obtained from the collected soils. Average annual emissions from constantly drained soils were 298 g CO 2 -C m -2 yr -1 , with most of the oxidation taking place between June and October. Short flood cycles increased annual oxidation rates compared with constantly drained soils, which had the second highest oxidation rate. Constantly flooded soils had the lowest annual oxidation rates, followed by summer flooded soils. Total N lost in leachate was highest for constantly drained soils, with NO 3 being the dominant form. The deep soils had higher losses of soluble N and C, whereas NO 3 losses from shallow soils were higher. Soil oxidation rates did not differ depending on proximity to the bedrock. We conclude that strategies that avoid short flooding cycles and include crop rotations that allow flooding during summer can reduce oxidation and N losses in leachate from EAA peats.

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Section: Co 2 Emissionsmentioning

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Ch 4 and N 2 O Emissionsmentioning

confidence: 99%

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Water management effect on soil oxidation, greenhouse gas emissions, and nitrogen leaching in drained peat soils

Rodrı́guez

Daroub

Gerber

et al. 2021

Soil Science Soc of Amer J

Self Cite

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“…Although NMR spectra do not provide the structural organization of SOC at the molecular level and therefore is prone to losing details (Danchenko et al 2020;Novotny et al 2020) and often the region of these chemical shifts are not completely exclusive (Stevenson 1994), it still gives approximate distribution of C functional groups (Danchenko et al 2020). By comparing in spectral regions, the degree of decomposition/humification of SOM in soils or the effects of different agricultural management practices on the distribution of C functional groups (Danchenko et al 2020) could be determined with the solid-state 13 C NMR spectroscopy (Helfrich et al 2006;Rodriguez et al 2021).…”

Section: Introductionmentioning

confidence: 99%

The effect of agroecosystem management on the distribution of C functional groups in soil organic matter: A review

et al. 2021

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To improve soil health and to aid in climate change mitigation, the quantity of soil organic matter (SOM) should be maintained or increased over the long run. In doing so, not only the total quantity of SOC but also the stability of SOC must be considered. Stability of SOC increases as a function of resistance to microbial decomposition or microbial substrate use efficiency through chemical, biological, and physical mechanisms including humification, hydrophobic moieties, molecular diversity, and formation of macroaggregates. One of the mechanisms that enhance stability confers changes in the distribution of C functional groups of SOM. To better understand and quantify how these changes are influenced by agricultural management practices, we collected 670 pairwise data from the body of literature that has evaluated changes in the distribution of C functional groups of SOM measured by solid-state 13C NMR spectroscopy. The types of agricultural managements discussed herein include (1) fertilization, (2) tillage, (3) crop rotation, (4) grazing, and (5) liming practices. Our meta-analyses show that these practices modify the distribution of C functional groups of SOM. Fertilization practices were associated with increased O-alkyl groups. Tillage resulted in increases in the SOC consisted of aromatic and carbonyl groups. Crop rotations, especially legume-based rotations, were found to increase the proportion of aromatic groups. Although there are fewer publications on tillage and crop rotation than on fertilization practices, the distribution of C functional groups may be more influenced by crop rotation and tillage practices than fertilization management—and should be a focus of future research.

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Effects of substitution of chemical fertilizer by Chinese milk vetch on distribution and composition of aggregates-associated organic carbon fractions in paddy soils

Nie

Geng

et al. 2022

Plant Soil

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Green manure plays a key role in reducing chemical fertilizer applications and increasing soil organic carbon (SOC) stock. The effects of chemical fertilizer substitution by Chinese milk vetch (MV) on the distribution and composition of organic carbon fractions in macroaggregates and microaggregates and SOC stability mechanism were investigated in a paddy soil in southern China. A 11-year (2008-2018) eld experiment was conducted, including no fertilizer (CK), 100% NPK fertilizer (F100), MV with different percentages of chemical fertilizer (MV + F100, MV + F80, MV + F60 and MV + F40). The soil was separated into distinct organic carbon fractions using aggregate density fractionation and SOC chemical structure was analyzed by fourier-transform infrared and nuclear magnetic resonance. Methods ResultsChemical fertilizer substitution by MV increased SOC contents in the bulk soil by 9.07% (MV + F80), 5.08% (MV + F60), 17.93% (MV + F40) compared to F100. Organic carbon fraction mainly existed in mSOC, accounting for 70.28-83.70% and 69.43-83.97% of the relative mass of macroaggregates and microaggregates, respectively. Compared to F100, aromatic C increased by 11.59% and 29.06% under MV + F60 within mSOC in macroaggregates and microaggregates. Within the mSOC in macroaggregates, compared to CK, MV + F80 and MV + F60 promoted the proportion of alkyl C by 9.61% and 6.69%, and decreased the content of O-alkyl C by 14.10% and 11.03%, respectively, which correspondingly increased alkyl C/O-alkyl C ratio. ConclusionsSubstitution of chemical fertilizer by MV (especially MV + F80 and MV + F60) improved the stability of SOC via increasing recalcitrant structure in mSOC, and was conducive to the sequestration of SOC in paddy soils.

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Soil carbon characterization in a subtropical drained peatland

Cited by 19 publications

References 60 publications

Water management effect on soil oxidation, greenhouse gas emissions, and nitrogen leaching in drained peat soils

Water management effect on soil oxidation, greenhouse gas emissions, and nitrogen leaching in drained peat soils

The effect of agroecosystem management on the distribution of C functional groups in soil organic matter: A review

Effects of substitution of chemical fertilizer by Chinese milk vetch on distribution and composition of aggregates-associated organic carbon fractions in paddy soils

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