Stock, distribution, preservation and structure of organic matter in soils of a climo-biosequence from a pedogenic perspective

Soil organic matter (SOM) represents the largest terrestrial pool of carbon (C). SOM characteristics such as stock, vertical distribution, preservation, and structural composition have been scarcely explored from pedogenic perspective. This study focused on a climo-biosequence in the Main Range of P...

Full description

Saved in:

Bibliographic Details
Main Author:	Haghighi, Amir Hossein Jafarzadeh
Format:	Thesis
Language:	English
Published:	2016
Subjects:	Humus Soils - Composition
Online Access:	http://psasir.upm.edu.my/id/eprint/58723/1/FP%202016%2057IR.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-upm-ir.58723
record_format	uketd_dc
spelling	my-upm-ir.587232018-02-01T03:35:39Z Stock, distribution, preservation and structure of organic matter in soils of a climo-biosequence from a pedogenic perspective 2016-01 Haghighi, Amir Hossein Jafarzadeh Soil organic matter (SOM) represents the largest terrestrial pool of carbon (C). SOM characteristics such as stock, vertical distribution, preservation, and structural composition have been scarcely explored from pedogenic perspective. This study focused on a climo-biosequence in the Main Range of Peninsular Malaysia since it presents an opportunity to study the impacts of soil-forming factors, pedogenic processes, and soil properties on SOM characteristics. Soil samples from all genetic horizons of four representative soil profiles were subjected to routine physical,chemical, and mineralogical analyses. Particle-size fractionation and fulvic acid and humic acid extraction in combination with solid-state 13C nuclear magnetic resonance spectroscopy, Fourier-transform infrared spectroscopy, and scanning electron microscopy were used as specific methods. Soil organic carbon stock to 1 m depth increased along the studied climo-biosequence, from 5.7 kg m-2 in Udult to 8.9 kg m-2 in Humult to 15.8 kg m-2 in Orthod, reaching a maximum value of 49.6 kg m-2 in Saprist. An increase in the proportion of fulvic acid with depth in soils where podzolization was the active pedogenic process showed the translocation of fulvic acid from the A-horizon toward the B-horizon. Close relationships between the content of organic carbon (OC) in the <53 μm fraction and indicators of Fe oxides and allophanetype aluminosilicates in the B-horizon indicated the importance of Fe oxides and poorly crystalline aluminosilicates for preservation of OC in the subsoil. Alkyl C (20.1-75.2%) and O-alkyl C (16.8-67.7%) dominated the bulk soils and particle-size fractions. The proportion of alkyl C in the bulk soils and particle-size fractions of Ahorizon increased with increasing levation, while O-alkyl C showed opposite trend. This study demonstrates that SOM characteristics such as stock, vertical distribution,preservation, and structural composition are controlled by soil-forming factors (i.e.climate and vegetation), pedogenic processes, soil properties (i.e. texture and mineralogy), and pedogenesis, respectively. Humus Soils - Composition 2016-01 Thesis http://psasir.upm.edu.my/id/eprint/58723/ http://psasir.upm.edu.my/id/eprint/58723/1/FP%202016%2057IR.pdf application/pdf en public phd doctoral Universiti Putra Malaysia Humus Soils - Composition
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Humus Soils - Composition
spellingShingle	Humus Soils - Composition Haghighi, Amir Hossein Jafarzadeh Stock, distribution, preservation and structure of organic matter in soils of a climo-biosequence from a pedogenic perspective
description	Soil organic matter (SOM) represents the largest terrestrial pool of carbon (C). SOM characteristics such as stock, vertical distribution, preservation, and structural composition have been scarcely explored from pedogenic perspective. This study focused on a climo-biosequence in the Main Range of Peninsular Malaysia since it presents an opportunity to study the impacts of soil-forming factors, pedogenic processes, and soil properties on SOM characteristics. Soil samples from all genetic horizons of four representative soil profiles were subjected to routine physical,chemical, and mineralogical analyses. Particle-size fractionation and fulvic acid and humic acid extraction in combination with solid-state 13C nuclear magnetic resonance spectroscopy, Fourier-transform infrared spectroscopy, and scanning electron microscopy were used as specific methods. Soil organic carbon stock to 1 m depth increased along the studied climo-biosequence, from 5.7 kg m-2 in Udult to 8.9 kg m-2 in Humult to 15.8 kg m-2 in Orthod, reaching a maximum value of 49.6 kg m-2 in Saprist. An increase in the proportion of fulvic acid with depth in soils where podzolization was the active pedogenic process showed the translocation of fulvic acid from the A-horizon toward the B-horizon. Close relationships between the content of organic carbon (OC) in the <53 μm fraction and indicators of Fe oxides and allophanetype aluminosilicates in the B-horizon indicated the importance of Fe oxides and poorly crystalline aluminosilicates for preservation of OC in the subsoil. Alkyl C (20.1-75.2%) and O-alkyl C (16.8-67.7%) dominated the bulk soils and particle-size fractions. The proportion of alkyl C in the bulk soils and particle-size fractions of Ahorizon increased with increasing levation, while O-alkyl C showed opposite trend. This study demonstrates that SOM characteristics such as stock, vertical distribution,preservation, and structural composition are controlled by soil-forming factors (i.e.climate and vegetation), pedogenic processes, soil properties (i.e. texture and mineralogy), and pedogenesis, respectively.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Haghighi, Amir Hossein Jafarzadeh
author_facet	Haghighi, Amir Hossein Jafarzadeh
author_sort	Haghighi, Amir Hossein Jafarzadeh
title	Stock, distribution, preservation and structure of organic matter in soils of a climo-biosequence from a pedogenic perspective
title_short	Stock, distribution, preservation and structure of organic matter in soils of a climo-biosequence from a pedogenic perspective
title_full	Stock, distribution, preservation and structure of organic matter in soils of a climo-biosequence from a pedogenic perspective
title_fullStr	Stock, distribution, preservation and structure of organic matter in soils of a climo-biosequence from a pedogenic perspective
title_full_unstemmed	Stock, distribution, preservation and structure of organic matter in soils of a climo-biosequence from a pedogenic perspective
title_sort	stock, distribution, preservation and structure of organic matter in soils of a climo-biosequence from a pedogenic perspective
granting_institution	Universiti Putra Malaysia
publishDate	2016
url	http://psasir.upm.edu.my/id/eprint/58723/1/FP%202016%2057IR.pdf
_version_	1747812226061828096

Stock, distribution, preservation and structure of organic matter in soils of a climo-biosequence from a pedogenic perspective

Similar Items