Iron addition to soil specifically stabilized lignin

Hall, Steven J.; Silver, Whendee L.; Timokhin, Vitaliy I.; Hammel, Kenneth E.

doi:10.1016/j.soilbio.2016.04.010

Cited by 69 publications

(50 citation statements)

References 31 publications

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“…It is observed that up to an average of 40% of lignin phenols are ‘protected’ by reactive Fe in the subsoils and not detected by the conventional CuO oxidation method. More importantly, in line with previous findings2029, wetland WTD not only decreases phenol oxidative activity and β-1,4-glucosidase (β-glucosidase) activity but also increases Fe-bound lignin phenols in the air-exposed soils due to Fe(II) oxidation. We hence propose that redox-induced Fe transformation may act as an ‘iron gate’ against the ‘enzyme latch’ in regulating SOC dynamics under oxygen exposure during wetland WTD.…”

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confidence: 90%

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Iron-mediated soil carbon response to water-table decline in an alpine wetland

et al. 2017

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The tremendous reservoir of soil organic carbon (SOC) in wetlands is being threatened by water-table decline (WTD) globally. However, the SOC response to WTD remains highly uncertain. Here we examine the under-investigated role of iron (Fe) in mediating soil enzyme activity and lignin stabilization in a mesocosm WTD experiment in an alpine wetland. In contrast to the classic ‘enzyme latch’ theory, phenol oxidative activity is mainly controlled by ferrous iron [Fe(II)] and declines with WTD, leading to an accumulation of dissolvable aromatics and a reduced activity of hydrolytic enzyme. Furthermore, using dithionite to remove Fe oxides, we observe a significant increase of Fe-protected lignin phenols in the air-exposed soils. Fe oxidation hence acts as an ‘iron gate’ against the ‘enzyme latch’ in regulating wetland SOC dynamics under oxygen exposure. This newly recognized mechanism may be key to predicting wetland soil carbon storage with intensified WTD in a changing climate.

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confidence: 90%

“…The observed increase of Fe-bound lignin phenols in the air-exposed soil layers echoes lignin stabilization with the oxidation of added Fe(II) into a moist tropical soil29. Since none of the extractable Fe increased under WTD (Supplementary Fig.…”

Section: Discussionmentioning

confidence: 70%

Iron-mediated soil carbon response to water-table decline in an alpine wetland

et al. 2017

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“…However, Feo was more significantly positively correlated with the intensity of aromatic C (R 2 = 0.8497, P < 0.001) than with that of O-alkyl C, indicating that Feo may preferentially preserve aromatic organic compounds. This finding agrees with the results of Hall et al (2016), who conducted an incubation experiment with and without Fe addition to the soil and found that the precipitation of reactive Fe oxides following Fe (II) oxidation hardly affected the production of CO 2 , but specifically suppressed the decomposition of lignin. Kramer et al (2012) reported that the oxidized lignin content increased with increasing SRO mineral content by studying a chronosequence of volcanic soils in Hawai'i.…”

Section: Effect Of Feo On Soil Organic Carbon Chemical Structuresupporting

confidence: 92%

Carbon Sequestration Potential Promoted by Oxalate Extractable Iron Oxides through Organic Fertilization

Huang

Feng

Zhao

et al. 2017

Soil Science Soc of Amer J

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Abbreviations: CK, control with no fertilizer; CMR, C mineralization rate; CMR, Fed, diothionate extractable iron oxides; Feo, oxalate-extractable iron oxides; MBC, microbial biomass C; NPK, Chemical fertilizer; NPKM, 50% chmical fertilizer plus manure; NPKS, 100% chemical fertilizer plus straw; NPKMOI, 20% chemical fertilizer plus manure organic-inorganic compound fertilizer; SCMR, specific C mineralization rate; SOC, soil organic C; SRO, short-ranged order. S oil organic carbon constitutes the largest terrestrial C reservoir in the global C cycle (Heimann and Reichstein, 2008). The long-term storage and stability of SOC have a profound influence on soil fertility enhancement, food security improvement, and global warming mitigation (Lal, 2004). Furthermore, SOC is closely associated with a wide range of soil biogeochemistries and thus plays an important role in improving soil quality and agro-ecosystem productivity (Reeves, 1997). Therefore, C sequestration in agricultural soils by increasing organic amendment inputs has long been considered an important issue in increasing the SOC content and the mechanisms underlying the accumulation of SOC have drawn increasing attention Wen et al., 2014 • Oxalate extractable iron oxides contributed to soil organic carbon sequestration.• Soil organic carbon from 20 to 40 cm was more labile than that from 0 to 20 cm.• Oxalate extractable iron oxides preferentially preserved aromatic compounds.

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“…and biologically mediated gases (Hall and Silver, 2015;Hall et al, 2016), and of biogeochemical processes that cross wide spatial and temporal scales, i.e., what we are accustomed to calling ecological and geological timescales (e.g., Shanley et al, 2011;Dialynas et al, 2016). The research demonstrates how lithologic knickpoints that cross streams and resist downcutting control up-catchment soil formation, plant productivity, and landscape evolution (Wolf et al, 2016).…”

Section: Colocating Ilters and Czosmentioning

confidence: 94%

Ideas and perspectives: Strengthening the biogeosciences in environmental research networks

et al. 2018

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Abstract. Long-term environmental research networks are one approach to advancing local, regional, and global environmental science and education. A remarkable number and wide variety of environmental research networks operate around the world today. These are diverse in funding, infrastructure, motivating questions, scientific strengths, and the sciences that birthed and maintain the networks. Some networks have individual sites that were selected because they had produced invaluable long-term data, while other networks have new sites selected to span ecological gradients. However, all long-term environmental networks share two challenges. Networks must keep pace with scientific advances and interact with both the scientific community and society at large. If networks fall short of successfully addressing these challenges, they risk becoming irrelevant. The objective of this paper is to assert that the biogeosciences offer environmental research networks a number of opportunities to expand scientific impact and public engagement. We explore some of these opportunities with four networks: the International Long-Term Ecological Research Network programs (ILTERs), critical zone observatories (CZOs), Earth and ecological observatory networks (EONs), and the FLUXNET program of eddy flux sites. While these networks were founded and expanded by interdisciplinary scientists, the preponderance of expertise and funding has gravitated activities of ILTERs and EONs toward ecology and biology, CZOs toward the Earth sciences and geology, and FLUXNET toward ecophysiology and micrometeorology. Our point is not to homogenize networks, nor to diminish disciplinary science. Rather, we argue that by more fully incorporating the integration of biology and geology in long-term environmental research networks, scientists can better leverage network assets, keep pace with the ever-changing science of the environment, and engage with larger scientific and public audiences.

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Iron addition to soil specifically stabilized lignin

Cited by 69 publications

References 31 publications

Iron-mediated soil carbon response to water-table decline in an alpine wetland

Iron-mediated soil carbon response to water-table decline in an alpine wetland

Carbon Sequestration Potential Promoted by Oxalate Extractable Iron Oxides through Organic Fertilization

Ideas and perspectives: Strengthening the biogeosciences in environmental research networks

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