The Soil Humeome: Chemical Structure, Functions and Technological Perspectives

Piccolo, Alessandro; Spaccini, Riccardo; Savy, Davide; Δρόσος, Μάριος; Cozzolino, Vincenza

doi:10.1007/978-3-030-17891-8_7

Cited by 37 publications

(32 citation statements)

References 159 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The presence of poorly soluble material in the lower horizons of these young soil profiles suggests that they must have been translocated in forms that are not readily available for biological degradation. These findings seem to be consistent with the supramolecular association model of humic molecules in solution [27,28], whereby even poorly polar organic compounds may be mobilized in the soil solution provided that they are associated to the hydrophobic domains of humic aggregates. When the physical-chemical conditions of the solution vary, such as the polarity of the medium, the size of the micropores or the nature of the solid phase, the humic association may then loose its stability and some of its poorly soluble components may be deposited on the mineral surfaces.…”

Section: Humus Changes In Horizons and Profilessupporting

confidence: 85%

“…The various indications of this study that the alkaline extraction cannot entirely remove the aliphatic components of soil organic matter is in agreement with other findings that showed that humin, the unextractable fraction of soil humus, contains a large amount of aliphatic compounds such as long-chain fatty acids, long-chain alcohols, alkanes, and aliphatic biopolymers (cutin, suberin, cutan, suberan) [18,36]. Moreover, the persistence in soil of a humin fraction of mainly aliphatic character substantiates a process of soil organic matter accumulation based on the poor water solubility of the organic compounds in soils, such as phenols and fatty acids [28].…”

Section: Humus Changes In Horizons and Profilesmentioning

confidence: 98%

See 1 more Smart Citation

Infrared spectra of soil organic matter under a primary vegetation sequence

Nuzzo¹,

Buurman

Cozzolino

et al. 2020

Chem. Biol. Technol. Agric.

View full text Add to dashboard Cite

Background: We applied Fourier-Transformed Infrared Spectroscopy (FTIR) techniques in combination with selective humus extractions to investigate in situ the chemical features of organic matter in three soil profiles recently developed from Dutch sand dunes, under well-documented vegetation sequence and containing a relatively simple mineral-organic matter system. Water-soluble and alkaline-soluble extracts were also studied to match the changes of humus in the soil residues.Results: Diffuse Reflectance Infrared Fourier Transform (DRIFT) and transmission spectra differed in resolution and sensitivity. DRIFT was superior in revealing structural information on the organic matter present in the soil samples whereas transmission spectra showed higher resolution for the bands of inorganic material at lower spectral frequencies. Differences between H and B horizons were due to the amount of hydrophilic organic acids, partly unsaturated, that were extracted by alkali. Extractable carboxylic acids and other hydrophilic compounds such as peptides and carbohydrates were larger in the less developed soils under pine and crowberry than in the more advanced profiles under beech. Humin residues from both H and B horizons retained unextractable aliphatic components and carboxylic groups involved in strong complexes with minerals, thereby confirming other findings that showed the largely aliphatic character of the unextractable humic fraction. Accumulation of poorly-soluble organic materials in these soils occur by protection from biodegradation due both to complexation with soil minerals and to a process by which apolar humic constituents form a separate hydrophobic phase where no biological activity can take place. Transport of poorly soluble compounds from H to B horizons, noticed especially in the more developed profiles, may have occurred through humic aggregates containing hydrophobic phases. Conclusions:This work shows that the DRIFT technique in combination with soil chemical treatments can be suitably employed to investigate the changes of organic matter in whole soil samples and represents a valid tool to investigate the role of organic matter in soil profile development.

show abstract

Section: Humus Changes In Horizons and Profilessupporting

confidence: 85%

Section: Humus Changes In Horizons and Profilesmentioning

confidence: 98%

Infrared spectra of soil organic matter under a primary vegetation sequence

Nuzzo¹,

Buurman

Cozzolino

et al. 2020

Chem. Biol. Technol. Agric.

View full text Add to dashboard Cite

show abstract

“…The value of Hydrophobicity coefficient was related to the large negative impact of the alkyl groups (Figure 3 and Table 3), which may have either a direct negative effect on plant growth or a role in reducing the positive bioactivity of polar molecules. In fact, hydrophilic bioactive molecules may become trapped within the hydrophobic domains of HLS, thus limiting their interactions with plant tissues and ultimately and significantly affecting HLS biological properties (Spaccini et al, 2002;Piccolo et al, 2019). In contrast to our results, García et al (2016) reported a positive effect of alkyl C on plant development.…”

Section: Different Chemical Functionalities Display Diverse Effects Tcontrasting

confidence: 99%

“…Among several categories of biostimulants, Humic Substances (HS, including fulvic and humic acids) and HLSs are the most relevant and intensively studied (Grand View Research, 2019). They are extracted from soils, sediments, composted biomasses or agro-industrial residues and might be regarded as supramolecular associations of small, heterogeneous molecules held together in metastable structures by non-covalent interactions (van de Waals, π-π, H-bonds; metal bridges) (Piccolo et al, 2019;Wells and Stretz, 2019). Extracting HLS from energy crops or agro-industrial residues is also important from the environmental point of view, because it involves recycling precious photosynthate, which would be otherwise burnt or landfilled (Cherubini, 2010;Savy et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Quantitative Structure-Activity Relationship of Humic-Like Biostimulants Derived From Agro-Industrial Byproducts and Energy Crops

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Они содержатся в составе органического вещества биокосных тел, их можно назвать главной составляющей этого вещества, они имеют наиболее термодинамически устойчивую и естественную форму, которая способствует их сохранению в биосфере. Гуминовые вещества по своей экологической важности занимают центральное место в составе органического вещества почв, выполняя важнейшие функции [5]. Органическое вещество является  УСПЕХИ СОВРЕМЕННОГО ЕСТЕСТВОЗНАНИЯ № 10, 2020   СЕЛЬСКОХОЗЯЙСТВЕННЫЕ НАУКИ (06.01.00, 06.03.00)  связующим звеном в эволюции живой и неживой материи.…”

unclassified

Features of the Chemical Structure of Humic Acids of Permafrost Chernozems of the South of the Vitimsky Plateau

Chimitdorzhieva¹,

Chimitdorzhieva²,

Tsybenov³

2020

УСЕ (ACNR)

View full text Add to dashboard Cite

Исследованы препараты черноземов квазиглеевых юга Витимского плоскогорья. Изучение функциональных групп показало, что адсорбционные свойства и реакционная способность гуминовых кислот черноземов квазиглеевых достаточно высоки. Типовые признаки строения гуминовых кислот, такие как алифатические, ароматические фрагменты и функциональные группы, выявлены благодаря 13 С-ЯМР спектроскопии. Определено, что в пахотных почвах меньше алифатических фрагментов углерода, чем в целинных почвах. Однако в них большую долю углерода представляют карбоксильные группы, показывая преимущество окисления. Показано, что доминирующими фрагментами в макромолекулах гуминовых кислот были ароматические. Поскольку гуминовые кислоты квазиглеевых черноземов имели более конденсированную структуру молекул, то общая ароматичность характеризуется как высокая. В гуминовых кислотах агрогенных почв в структуре проявляется тенденция уменьшения алифатического углерода как аминометоксильных, так и альдегидных групп в связи с преимуществом улучшения биологической активности в пахотных вариантах. Наблюдается меньшая обуглероженность гуминовых кислот исследуемых черноземов в сравнении с черноземами более теплых фаций. В построении макромолекулы гуминовой кислоты черноземов составляло 25,3 ат. %. Содержание кислорода в исследованных препаратах 26,8 ат. %. Обедненность источников гумуса привела к тому, что азота в составе гуминовых кислот содержится незначительное количество. Оптимальные условия увлажнения обусловили Н:С, равный 0,67. Снижение показателя Н:С приводит к увеличению степени бензоидности до 23, тем не менее показатель характеризуется как достаточно низкий по сравнению с данными черноземов более теплых регионов. Ключевые слова: структура гумусовых кислот, чернозем квазиглеевый, юг Витимского плоскогорья, 13 С-ЯМР, функциональные группы

show abstract

The Soil Humeome: Chemical Structure, Functions and Technological Perspectives

Cited by 37 publications

References 159 publications

Infrared spectra of soil organic matter under a primary vegetation sequence

Infrared spectra of soil organic matter under a primary vegetation sequence

Quantitative Structure-Activity Relationship of Humic-Like Biostimulants Derived From Agro-Industrial Byproducts and Energy Crops

Features of the Chemical Structure of Humic Acids of Permafrost Chernozems of the South of the Vitimsky Plateau

Contact Info

Product

Resources

About