Characterizing soil organic matter in Arctic tundra soils by different analytical approaches

Dai, Xiaoyan; Ping, C. L.; Michaelson, G. J.

doi:10.1016/s0146-6380(02)00012-8

Cited by 57 publications

(31 citation statements)

References 18 publications

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“…According to the results of graphical-statistic analysis, FAs contain more acids and less carbon in contrast to HAs and so have remarkably substituted aromatic rings and developed side aliphatic chains. The obtained results generally agree with data available for tundra soils (Dai et al 2001(Dai et al , 2002 and for podzolic and boggy-podzolic soils (Simpson et al 1997;Kechaikina et al 2011).…”

Section: Horizonsupporting

confidence: 88%

Humic substances elemental composition of selected taiga and tundra soils from Russian European North-East

Лодыгин¹,

Beznosikov²,

Abakumov³

2017

Polish Polar Research

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This paper provides an overview of the results of research on changes in ground temperature down to 50 cm depth, on the Kaffiøyra Plain, Spitsbergen in the summer seasons. To achieve this, measurement data were analysed from three different ecotopes (CALM Site P2A, P2B and P2C) -a beach, a moraine and tundra -collected during 22 polar expeditions between 1975 and 2014. To ensure comparability, data sets for the common period from 21 July to 31 August (referred to as the "summer season" further in the text) were analysed. The greatest influence on temperature across the inves− tigated ground layers comes from air temperature (correlation coefficients ranging from 0.61 to 0.84). For the purpose of the analysis of the changes in ground temperature in the years 1975-2014, missing data for certain summer seasons were reconstructed on the ba− sis of similar data from a meteorological station at Ny−Ålesund. The ground temperature at the Beach site demonstrated a statistically−significant growing trend: at depths from 1 to 10 cm the temperature increased by 0.27-0.28°C per decade, and from 20 to 50 cm by as much as 0.30°C per decade. On the Kaffiøyra Plain, the North Atlantic Oscillation (NAO) has a greater influence on the ground and air temperature than the Arctic Oscilla− tion (AO).

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Section: Horizonsupporting

confidence: 88%

Humic substances elemental composition of selected taiga and tundra soils from Russian European North-East

Лодыгин¹,

Beznosikov²,

Abakumov³

2017

Polish Polar Research

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“…Because so much SOM is currently stabilized simply by environmental conditions, most efforts to evaluate the quality of organic carbon stored in permafrost region soils have focused on characterizing the chemical composition of the organic matter (e.g., Dai et al, 2002a;Turetsky et al, 2007;Pedersen et al, 2011). Chemical characterization studies have run the gamut of methodologies in efforts to assess the current state of degradation -from wet chemical fractionations (acid/base extractions, molecular biomarkers, and water or solvent extractions; e.g., Uhlířová et al, 2007;Paulter et al, 2010;Hugelius et al, 2012) to various types of spectrochemical analysis (nuclear magnetic resonance spectroscopy, pyrolysis-gas chromatography/mass spectrometry, mid-infrared spectroscopy; e.g., Dai et al, 2002a, b;Andersen and White, 2006;Waldrop et al, 2010;Pedersen et al, 2011;Pengerud et al, 2013).…”

Section: Characterization Of the Quality And Decomposability Of Organmentioning

confidence: 99%

Permafrost soils and carbon cycling

Ping

Jastrow

Jorgenson

et al. 2015

SOIL

268

188

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Abstract. Knowledge of soils in the permafrost region has advanced immensely in recent decades, despite the remoteness and inaccessibility of most of the region and the sampling limitations posed by the severe environment. These efforts significantly increased estimates of the amount of organic carbon stored in permafrost-region soils and improved understanding of how pedogenic processes unique to permafrost environments built enormous organic carbon stocks during the Quaternary. This knowledge has also called attention to the importance of permafrost-affected soils to the global carbon cycle and the potential vulnerability of the region's soil organic carbon (SOC) stocks to changing climatic conditions. In this review, we briefly introduce the permafrost characteristics, ice structures, and cryopedogenic processes that shape the development of permafrost-affected soils, and discuss their effects on soil structures and on organic matter distributions within the soil profile. We then examine the quantity of organic carbon stored in permafrost-region soils, as well as the characteristics, intrinsic decomposability, and potential vulnerability of this organic carbon to permafrost thaw under a warming climate. Overall, frozen conditions and cryopedogenic processes, such as cryoturbation, have slowed decomposition and enhanced the sequestration of organic carbon in permafrost-affected soils over millennial timescales. Due to the low temperatures, the organic matter in permafrost soils is often less humified than in more temperate soils, making some portion of this stored organic carbon relatively vulnerable to mineralization upon thawing of permafrost.

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“…3 Comparison of literature C/N vs. alkyl/O-alkyl ratios derived from solid-state 13 C NMR spectra. Data take from: (Beyer et al, 1995(Beyer et al, , 2001Dai et al, 2001Dai et al, , 2002Sjögersten et al, 2003;Simpson et al, 2008) degradation, the alkyl/O-alkyl ratio increases because labile (O-alkyl) components are preferentially degraded compared to more resistant alkyl components. However, the large variation within the data points suggests that the relationship is not necessarily robust.…”

Section: Peptidesmentioning

confidence: 99%

The Chemical Ecology of Soil Organic Matter Molecular Constituents

Simpson

2012

J Chem Ecol

127

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Soil organic matter (OM) contains vast stores of carbon, and directly supports microbial, plant, and animal life by retaining essential nutrients and water in the soil. Soil OM plays important roles in biological, chemical, and physical processes within the soil, and arguably plays a major role in maintaining long-term ecological stability in a changing world. Despite its importance, there is a great deal still unknown about soil OM chemical ecology. The development of sophisticated analytical methods have reshaped our understanding of soil OM composition, which is now believed to be comprised of plant and microbial products at various stages of decomposition. The methods also have recently been applied to study environmental change in various settings and have provided unique insight with respect to soil OM chemical ecology. The goal of this review is to highlight the methods used to characterize soil OM structure, source, and degradation that have enabled precise observations of OM and associated ecological shifts. Although the chemistry of soil OM is important in its overall fate in ecosystems, the studies conducted to date suggest that ecological function is not defined by soil OM chemistry alone. The long-standing questions regarding soil OM stability and recalcitrance will likely be answered when several molecular methods are used in tandem to closely examine structure, source, age, degradation stage, and interactions of specific OM components in soil.

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Characterizing soil organic matter in Arctic tundra soils by different analytical approaches

Cited by 57 publications

References 18 publications

Humic substances elemental composition of selected taiga and tundra soils from Russian European North-East

Humic substances elemental composition of selected taiga and tundra soils from Russian European North-East

Permafrost soils and carbon cycling

The Chemical Ecology of Soil Organic Matter Molecular Constituents

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