Accumulation of lignin residues in organic matter fractions of lowland rice soils: a pyrolysis-GC-MS study

In tropical Asia, multiple annual cropping of lowland rice and the associated submerged soil conditions have been linked to long-term changes in nitrogen (N) cycling and the chemical nature of soil organic matter. To identify changes in organic matter properties, two humic acid fractions and whole s...

Full description

Saved in:
Bibliographic Details
Main Authors: Olk, D C, Dancel, M C, Moscoso, E, Jimenez, R R, Dayrit, Fabian M
Format: text
Published: Archīum Ateneo 2002
Subjects:
Online Access:https://archium.ateneo.edu/chemistry-faculty-pubs/104
https://journals.lww.com/soilsci/Abstract/2002/09000/ACCUMULATION_OF_LIGNIN_RESIDUES_IN_ORGANIC_MATTER.4.aspx
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Ateneo De Manila University
id ph-ateneo-arc.chemistry-faculty-pubs-1103
record_format eprints
spelling ph-ateneo-arc.chemistry-faculty-pubs-11032020-07-27T05:48:03Z Accumulation of lignin residues in organic matter fractions of lowland rice soils: a pyrolysis-GC-MS study Olk, D C Dancel, M C Moscoso, E Jimenez, R R Dayrit, Fabian M In tropical Asia, multiple annual cropping of lowland rice and the associated submerged soil conditions have been linked to long-term changes in nitrogen (N) cycling and the chemical nature of soil organic matter. To identify changes in organic matter properties, two humic acid fractions and whole soil samples were obtained from field treatments of lowland rice that varied in cropping intensity, fertilizer management, and location. These samples were methylated and analyzed by pyrolysis-gas chromatography-mass spectrometry. With compounds expressed in relative abundance, whole soil was enriched in nonmethoxybenzene compounds and heterocyclic N compounds compared with extracted humic acids. The young mobile humic acid (MHA) fraction had a wide diversity of methoxybenzenes that are associated with lignin residues. The more recalcitrant calcium humate (CaHA) fraction had characteristics intermediate between whole soil and MHA. Under intensified cropping and increased soil submergence, lignin residues increased in relative abundance in all three fractions. Heterocyclic N compounds decreased with intensified cropping, consistent with previous analysis by 15N nuclear magnetic resonance spectroscopy. Their parent compounds may be primarily naturally occurring heterocyclic N compounds. For whole soil, and especially the MHA, submergence effects were accentuated in treatments with high fertilizer rates, trends that may be related to the balance between input rates and degradation rates of crop residues. The ratio of myristic acid: stearic acid varied with soil submergence, fertilizer rate, and type of fraction in patterns following the abundance of methoxybenzenes. In general, responses of the MHA and CaHA to field treatments were representative of whole soil. 2002-01-01T08:00:00Z text https://archium.ateneo.edu/chemistry-faculty-pubs/104 https://journals.lww.com/soilsci/Abstract/2002/09000/ACCUMULATION_OF_LIGNIN_RESIDUES_IN_ORGANIC_MATTER.4.aspx Chemistry Faculty Publications Archīum Ateneo Pyrolysis soil organic matter phenols rice humification Chemistry Organic Chemistry
institution Ateneo De Manila University
building Ateneo De Manila University Library
country Philippines
collection archium.Ateneo Institutional Repository
topic Pyrolysis
soil organic matter
phenols
rice
humification
Chemistry
Organic Chemistry
spellingShingle Pyrolysis
soil organic matter
phenols
rice
humification
Chemistry
Organic Chemistry
Olk, D C
Dancel, M C
Moscoso, E
Jimenez, R R
Dayrit, Fabian M
Accumulation of lignin residues in organic matter fractions of lowland rice soils: a pyrolysis-GC-MS study
description In tropical Asia, multiple annual cropping of lowland rice and the associated submerged soil conditions have been linked to long-term changes in nitrogen (N) cycling and the chemical nature of soil organic matter. To identify changes in organic matter properties, two humic acid fractions and whole soil samples were obtained from field treatments of lowland rice that varied in cropping intensity, fertilizer management, and location. These samples were methylated and analyzed by pyrolysis-gas chromatography-mass spectrometry. With compounds expressed in relative abundance, whole soil was enriched in nonmethoxybenzene compounds and heterocyclic N compounds compared with extracted humic acids. The young mobile humic acid (MHA) fraction had a wide diversity of methoxybenzenes that are associated with lignin residues. The more recalcitrant calcium humate (CaHA) fraction had characteristics intermediate between whole soil and MHA. Under intensified cropping and increased soil submergence, lignin residues increased in relative abundance in all three fractions. Heterocyclic N compounds decreased with intensified cropping, consistent with previous analysis by 15N nuclear magnetic resonance spectroscopy. Their parent compounds may be primarily naturally occurring heterocyclic N compounds. For whole soil, and especially the MHA, submergence effects were accentuated in treatments with high fertilizer rates, trends that may be related to the balance between input rates and degradation rates of crop residues. The ratio of myristic acid: stearic acid varied with soil submergence, fertilizer rate, and type of fraction in patterns following the abundance of methoxybenzenes. In general, responses of the MHA and CaHA to field treatments were representative of whole soil.
format text
author Olk, D C
Dancel, M C
Moscoso, E
Jimenez, R R
Dayrit, Fabian M
author_facet Olk, D C
Dancel, M C
Moscoso, E
Jimenez, R R
Dayrit, Fabian M
author_sort Olk, D C
title Accumulation of lignin residues in organic matter fractions of lowland rice soils: a pyrolysis-GC-MS study
title_short Accumulation of lignin residues in organic matter fractions of lowland rice soils: a pyrolysis-GC-MS study
title_full Accumulation of lignin residues in organic matter fractions of lowland rice soils: a pyrolysis-GC-MS study
title_fullStr Accumulation of lignin residues in organic matter fractions of lowland rice soils: a pyrolysis-GC-MS study
title_full_unstemmed Accumulation of lignin residues in organic matter fractions of lowland rice soils: a pyrolysis-GC-MS study
title_sort accumulation of lignin residues in organic matter fractions of lowland rice soils: a pyrolysis-gc-ms study
publisher Archīum Ateneo
publishDate 2002
url https://archium.ateneo.edu/chemistry-faculty-pubs/104
https://journals.lww.com/soilsci/Abstract/2002/09000/ACCUMULATION_OF_LIGNIN_RESIDUES_IN_ORGANIC_MATTER.4.aspx
_version_ 1681506783332401152