Will changes in climate and land use affect soil organic matter composition? Evidence from an ecotonal climosequence

Purton, Kendra; Pennock, D.J.; Leinweber, Peter; Walley, F.L.

doi:10.1016/j.geoderma.2015.04.007

Cited by 28 publications

(17 citation statements)

References 58 publications

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“…Grasslands are one of the most widespread vegetation types world-wide and play a crucial role in the global terrestrial C cycle [29,30]. To date, a few studies have examined OM composition of the whole soils in the grassland subsurface [31,32], but the composition of mineral-associated OM in grassland subsoils remain elusive. In addition, soil processes (such as drainage and aeration) may have a strong influence on the vertical distribution of SOM composition [33].…”

Section: Introductionmentioning

confidence: 99%

The Composition and Stability of Clay-Associated Organic Matter along a Soil Profile

et al. 2018

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Organic carbon in subsoil generally has longer turnover times than that in surface soil, but little is known about how the stability of the specific organic compound classes changes with soil depth. The objective of this study was to analyze the composition and thermal stability of clay-associated organic matter (OM) at varying soil depths in the summit and footslope of a pasture hillslope using C X-ray absorption near edge structure (XANES) and pyrolysis-field ionization mass spectrometry (Py-FIMS). C XANES showed aromatic C was relatively enriched in the subsoil, relative to the surface soil. Py-FIMS demonstrated a relative enrichment of phenols/lignin monomers and alkylaromatics with increasing profile depth in the summit soil, and to a greater extent in the footslope soil, followed by a decreasing abundance of sterols. In surface soil, the thermostability of clay-associated OM increases in the order: carbohydrates and N compounds < phenols/lignin monomers < lignin dimers and alkylaromatics, suggesting the intrinsic chemical nature of OM as a major driver for OM persistent in surface soil. The thermal stability of clay-associated carbohydrates, N compounds, and phenols/lignin monomers increased with profile depth, likely due to stronger organic-organic/organic-mineral binding. In subsoil, the thermal stability of clay-associated carbohydrates and N compounds can be as high as that of alkylaromatic and lignin dimers, implying that persistent subsoil OM could be composed of organic compound classes, like carbohydrates, that were traditionally considered as biochemically labile compounds. In contrast, the thermally-stable compound classes, like lignin dimers and alkylaromatics, showed no changes in the thermal stability with soil depth. This study suggests that stability of the more labile OM compounds may be more strongly influenced by the change in environmental conditions, relative to the more stable forms.

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Section: Introductionmentioning

confidence: 99%

The Composition and Stability of Clay-Associated Organic Matter along a Soil Profile

et al. 2018

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“…Synchrotron-based near-edge Xray absorption fine structure (NEXAFS) spectroscopy is used to determine the chemical environment of C and N in the soil samples (Solomon et al 2012;Leinweber et al 2013;Gillespie et al 2015). In comparison with other techniques such as infrared or nuclear magnetic resonance (NMR) spectroscopies, NEXAFS spectroscopy is very sensitive to element speciation and has been applied to soil samples in order to elucidate chemical changes in C and N of soil OM due to effects of land management (Solomon et al 2005), N fertilization (Gillespie et al 2013) or climate change (Purton et al 2015).…”

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“…Initially, error functions were fitted to the edge jumps and then a series of Gaussian curves were centered according to the energy position of C and N species found in literature. Thus, Gaussian curves were set at 284.3, 285.3, 286.0, 286.6, 287.4, 288.4 and 289.3 eV in the NEXAFS C1s spectra corresponding to quinone-C, substituted aromatic-C, aromatic-C/pyridinic-C, phenolic-C, aliphatic-C, carboxyl-C and O-alkyl-C, respectively Gillespie et al 2014;Purton et al 2015). Gaussian curves for the N K-edge were placed at 398.8, 400, 401.4, 402.7 and 405.4 eV corresponding to heterocyclic-N (e.g.…”

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Chemical changes in organic matter after fungal colonization in a nitrogen fertilized and unfertilized Norway spruce forest

et al. 2017

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Background and aims Decomposition and transformation of organic matter (OM) in forest soils are conducted by the concomitant action of saprotrophic and mycorrhizal fungi. Here, we examine chemical changes in OM after fungal colonization in nitrogen fertilized and unfertilized soils from a Norway spruce forest. Methods Sand-filled bags amended with composted maize leaves were placed in the forest soil and harvested after 17 months. Infrared and near edge X-ray absorption fine structure spectroscopies were used to study the chemical changes in the OM. Fungal community composition of the bags was also evaluated. Results The proportion of ectomycorrhizal fungi declined in the fertilized plots, but the overall fungal community composition was similar between N treatments. Decomposition of the OM was, independently of the N level or soil horizon, accompanied by an increase of C/N ratio of the mesh-bag content. Moreover, the proportions of carboxylic compounds in the incubated OM increased in the mineral horizon, while heterocyclic-N compounds decreased, especially in unfertilized plots with higher N demand from the trees. Conclusions Our results indicate that more oxidized organic C and less heterocyclic-N proportions in the OM remain after fungal colonization in the mineral layers, and suggest that ectomycorrhizal fungi transfer less heterocyclic-N from the mesh bags to the host trees under high N levels.

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“…В ряде работ отмечается, что изменение климата может значительно влиять на почвы и их свойства. В частности, исследования, проведенные в центральной Канаде, показывают реакцию почвенного органического вещества на климатическую динамику [19]. Другой аспект, касающийся эрозии почв, связанный с количеством выпавших осадков в период 1989 по 2007 гг., был рассмотрен в статье немецких исследователей.…”

Section: генезис и география почвunclassified

Почвенный Покров Юга Лесостепи Среднерусской Возвышенности На Фоне Внутривековых Климатических Изменений

Смирнова¹,

Кухарук²,

Чендев³

2016

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Для изучения ответной реакции зональных почв и почвенного покрова лесостепи на изменения климата с помощью методов повторных почвенных обследований были разработаны методические подходы и алгоритмы, позволяющие проанализировать индикаторы короткопериодических климатических изменений в виде отдельных трансформаций почвенного покрова, происходящих на юге лесостепи Среднерусской возвышенности. С помощью ГИС-технологий выполнены векторные карты территории исследования и составлены базы данных почвенных ареалов. За период между двумя турами крупномасштабного почвенного обследования Шебекинского р-на Белгородской обл. (1971, 1991 гг.) выявлены изменения климатических показателей, отражающие внутривековые циклы Брикнера. Особенностью климатических изменений явилось нарастание среднегодовых температур воздуха (на 0.2°С) и рост годового количества осадков (на 83 мм). На плакорных участках лугово-степных зональных ландшафтов выявлено нарастание площадей ареалов черноземов выщелоченных (Luvic Chernozems) и уменьшение площадей, занятых черноземами типичными (Haplic Chernozems).

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Will changes in climate and land use affect soil organic matter composition? Evidence from an ecotonal climosequence

Cited by 28 publications

References 58 publications

The Composition and Stability of Clay-Associated Organic Matter along a Soil Profile

The Composition and Stability of Clay-Associated Organic Matter along a Soil Profile

Chemical changes in organic matter after fungal colonization in a nitrogen fertilized and unfertilized Norway spruce forest

Почвенный Покров Юга Лесостепи Среднерусской Возвышенности На Фоне Внутривековых Климатических Изменений

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