Soluble Organic Matter, its Biodegradation, Dynamics and Abiotic Production
Soluble organic matter represent less than 1% of total soil organic matter (SOM) - but it contributes to many terrestrial ecosystem processes, due to its high mobility and reactivity in soil. Although it has been suggested that soluble organic matter (OM) may serve as an early indicator of soil qual...
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University of Canterbury. School of Forestry
2010
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ftunivcanter:oai:ir.canterbury.ac.nz:10092/5302 2023-05-15T17:09:26+02:00 Soluble Organic Matter, its Biodegradation, Dynamics and Abiotic Production Toosi, Ehsan Razavy 2010 application/pdf http://hdl.handle.net/10092/5302 https://doi.org/10.26021/2989 en eng University of Canterbury. School of Forestry NZCU http://hdl.handle.net/10092/5302 http://dx.doi.org/10.26021/2989 Copyright Ehsan Razavy Toosi https://canterbury.libguides.com/rights/theses soluble organic matter extractable organic matter biodegradation solubilization landuse soil depth seasonal variability Theses / Dissertations 2010 ftunivcanter https://doi.org/10.26021/2989 2022-09-08T13:39:35Z Soluble organic matter represent less than 1% of total soil organic matter (SOM) - but it contributes to many terrestrial ecosystem processes, due to its high mobility and reactivity in soil. Although it has been suggested that soluble organic matter (OM) may serve as an early indicator of soil quality changes as a result of shifts in land-use and management practices, only a few studies have addressed the dynamics of soluble OM in relation to land-use and specifically soil depth. This study focuses on two aspects of soluble OM. In the first part, I hypothesized that extractable OM obtained by aqueous solutions is a continuum of substances that depending on the extraction method can be separated into two operationally different fractions. The size and properties of these fractions may consistently differ among different land uses and at different soil depths. The objective of this part of the study was then to assess dynamics (size and properties, biodegradability and seasonality) of water extractable organic matter (WEOM) and salt extractable organic matter (SEOM) in a sequence of human dominated land-uses at topsoil and subsoil. At the second part of the study, I tested the regulatory gate hypothesis –abiotic solubilization of OM- as a primary controlling factor in soluble OM production. The objective of this study was to evaluate the impact of the microbial activity on the net production of dissolved organic matter (DOM) from the native SOM in the presence of added DOM and plant residue. For the first part of the experiment, the soil samples were collected from four land-uses under bog pine (Halocarpus bidwillii) woodland, tussock grassland (Festuca novae-zelandiae and Heiracium pilosella), cropland (Medicago sativa) and plantation forest (Pinus nigra). The selected land uses were located in the Mackenzie Basin, Canterbury, New Zealand and occurring on the same soils, topography and experienced similar climates. Soil samples were obtained from topsoil (0-20 cm) and subsoil (60-80 cm) at the end of each season ... Other/Unknown Material Mackenzie Basin University of Canterbury, Christchurch: UC Research Repository New Zealand Oryx 2 4 207 211 |
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University of Canterbury, Christchurch: UC Research Repository |
op_collection_id |
ftunivcanter |
language |
English |
topic |
soluble organic matter extractable organic matter biodegradation solubilization landuse soil depth seasonal variability |
spellingShingle |
soluble organic matter extractable organic matter biodegradation solubilization landuse soil depth seasonal variability Toosi, Ehsan Razavy Soluble Organic Matter, its Biodegradation, Dynamics and Abiotic Production |
topic_facet |
soluble organic matter extractable organic matter biodegradation solubilization landuse soil depth seasonal variability |
description |
Soluble organic matter represent less than 1% of total soil organic matter (SOM) - but it contributes to many terrestrial ecosystem processes, due to its high mobility and reactivity in soil. Although it has been suggested that soluble organic matter (OM) may serve as an early indicator of soil quality changes as a result of shifts in land-use and management practices, only a few studies have addressed the dynamics of soluble OM in relation to land-use and specifically soil depth. This study focuses on two aspects of soluble OM. In the first part, I hypothesized that extractable OM obtained by aqueous solutions is a continuum of substances that depending on the extraction method can be separated into two operationally different fractions. The size and properties of these fractions may consistently differ among different land uses and at different soil depths. The objective of this part of the study was then to assess dynamics (size and properties, biodegradability and seasonality) of water extractable organic matter (WEOM) and salt extractable organic matter (SEOM) in a sequence of human dominated land-uses at topsoil and subsoil. At the second part of the study, I tested the regulatory gate hypothesis –abiotic solubilization of OM- as a primary controlling factor in soluble OM production. The objective of this study was to evaluate the impact of the microbial activity on the net production of dissolved organic matter (DOM) from the native SOM in the presence of added DOM and plant residue. For the first part of the experiment, the soil samples were collected from four land-uses under bog pine (Halocarpus bidwillii) woodland, tussock grassland (Festuca novae-zelandiae and Heiracium pilosella), cropland (Medicago sativa) and plantation forest (Pinus nigra). The selected land uses were located in the Mackenzie Basin, Canterbury, New Zealand and occurring on the same soils, topography and experienced similar climates. Soil samples were obtained from topsoil (0-20 cm) and subsoil (60-80 cm) at the end of each season ... |
format |
Other/Unknown Material |
author |
Toosi, Ehsan Razavy |
author_facet |
Toosi, Ehsan Razavy |
author_sort |
Toosi, Ehsan Razavy |
title |
Soluble Organic Matter, its Biodegradation, Dynamics and Abiotic Production |
title_short |
Soluble Organic Matter, its Biodegradation, Dynamics and Abiotic Production |
title_full |
Soluble Organic Matter, its Biodegradation, Dynamics and Abiotic Production |
title_fullStr |
Soluble Organic Matter, its Biodegradation, Dynamics and Abiotic Production |
title_full_unstemmed |
Soluble Organic Matter, its Biodegradation, Dynamics and Abiotic Production |
title_sort |
soluble organic matter, its biodegradation, dynamics and abiotic production |
publisher |
University of Canterbury. School of Forestry |
publishDate |
2010 |
url |
http://hdl.handle.net/10092/5302 https://doi.org/10.26021/2989 |
geographic |
New Zealand |
geographic_facet |
New Zealand |
genre |
Mackenzie Basin |
genre_facet |
Mackenzie Basin |
op_relation |
NZCU http://hdl.handle.net/10092/5302 http://dx.doi.org/10.26021/2989 |
op_rights |
Copyright Ehsan Razavy Toosi https://canterbury.libguides.com/rights/theses |
op_doi |
https://doi.org/10.26021/2989 |
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