TY - JOUR

T1 - The Impact of Agricultural Use of Retisols on the Molecular Structure of Humic Substances

AU - Lodygin, Evgeny

AU - Abakumov, Evgeny

N1 - Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2022/1/7

Y1 - 2022/1/7

N2 - Agricultural soil use does not only affect the amount of soil organic matter, but also the molecular composition of humic (HAs) and fulvic acids (FAs). Changed hydrothermal conditions and composition of the incoming plant residues are reflected in the rate of humification and its products. The objective of this study was to compare the molecular composition of HAs and FAs isolated from Eutric Albic Stagnic Histic Retisol (Loamic), two Eutric Albic Retisols (Loamic)—mature and arable. Plots of mature Retisols are located at a middle taiga (Komi Republic, Russia) in a bilberry-green-moss birch-spruce forest. The plot of Retisols arable is located in the fields of the Syktyvkar state farm, which is 3.3 km northeast of mature Retisol plots. The development period is about 40 years, it is sowed with a pea-oat mixture. The results obtained indicate that soil reclamation essentially increases the proportion of aromatic components and decreases the content of carboxyl and ester groups in the humic substance (HS) structure. An increased extent of hydromorphism of Retisols leads to the enrichment of HS with aliphatic fragments.

AB - Agricultural soil use does not only affect the amount of soil organic matter, but also the molecular composition of humic (HAs) and fulvic acids (FAs). Changed hydrothermal conditions and composition of the incoming plant residues are reflected in the rate of humification and its products. The objective of this study was to compare the molecular composition of HAs and FAs isolated from Eutric Albic Stagnic Histic Retisol (Loamic), two Eutric Albic Retisols (Loamic)—mature and arable. Plots of mature Retisols are located at a middle taiga (Komi Republic, Russia) in a bilberry-green-moss birch-spruce forest. The plot of Retisols arable is located in the fields of the Syktyvkar state farm, which is 3.3 km northeast of mature Retisol plots. The development period is about 40 years, it is sowed with a pea-oat mixture. The results obtained indicate that soil reclamation essentially increases the proportion of aromatic components and decreases the content of carboxyl and ester groups in the humic substance (HS) structure. An increased extent of hydromorphism of Retisols leads to the enrichment of HS with aliphatic fragments.

KW - Arable soils

KW - Humic and fulvic acids

KW - NMR spectroscopy

KW - SOILS

KW - SPECTROSCOPY

KW - HUMUS ACIDS

KW - ORGANIC-MATTER

KW - TAIGA

KW - arable soils

KW - C-13 NMR

KW - humic and fulvic acids

UR - http://www.scopus.com/inward/record.url?scp=85123743879&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/97f8d225-d303-32ee-a0b6-2b6cac079973/

U2 - 10.3390/agronomy12010144

DO - 10.3390/agronomy12010144

M3 - Article

AN - SCOPUS:85123743879

VL - 12

JO - Agronomy

JF - Agronomy

SN - 2073-4395

IS - 1

M1 - 144

ER -