Organic matter in volcanic soils
Volcanic soils accumulate soil organic matter (SOM) usually through the formation of organo-mineral complexes. In terms of residence time, SOM quality depends on whether it is free or associated to the mineral fraction forming metal (non-allophanic andosols) or allophane complexes (allophanic andosols). This work deals with carbon sequestration mechanisms in volcanic ash soils from the Canary Islands. Physical and chemical soil properties were analysed and SOM studied by analytical pyrolysis (Py-GC/MS) in bulk and in two density fractions. Our findings points to different mechanisms for SOM protection 1) In allophanic soils is mainly associated to noncrystalline organo-mineral complexes, is rich in polysaccharides and N-compounds probably from chitin. 2) In nonallophanic soils a selective preservation mechanism is observed, SOM is formed of relatively unaltered plant components related to a protective effect of amorphous minerals favouring organo-metal complexes/coatings.
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International Humic Substances Society
2014-09-01
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dig-irnas-es-10261-1224332018-09-11T12:24:28Z Organic matter in volcanic soils González-Pérez, José Antonio Rodríguez-Eugenio, N. González-Vila, Francisco Javier Arbelo, C. D. Rodríguez-Rodríguez, A. Volcanic soils accumulate soil organic matter (SOM) usually through the formation of organo-mineral complexes. In terms of residence time, SOM quality depends on whether it is free or associated to the mineral fraction forming metal (non-allophanic andosols) or allophane complexes (allophanic andosols). This work deals with carbon sequestration mechanisms in volcanic ash soils from the Canary Islands. Physical and chemical soil properties were analysed and SOM studied by analytical pyrolysis (Py-GC/MS) in bulk and in two density fractions. Our findings points to different mechanisms for SOM protection 1) In allophanic soils is mainly associated to noncrystalline organo-mineral complexes, is rich in polysaccharides and N-compounds probably from chitin. 2) In nonallophanic soils a selective preservation mechanism is observed, SOM is formed of relatively unaltered plant components related to a protective effect of amorphous minerals favouring organo-metal complexes/coatings. Peer Reviewed 2015-09-22T08:11:49Z 2015-09-22T08:11:49Z 2014-09-01 2015-09-22T08:11:49Z póster de congreso http://purl.org/coar/resource_type/c_6670 uri: http://ihss2014.org/ 17th Meeting of the International Humic Substances Society (IHSS-17) Ioannina, Greece 1-5 September 2014 págs. 224-225 http://hdl.handle.net/10261/122433 Sí none International Humic Substances Society |
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Volcanic soils accumulate soil organic matter (SOM) usually through the formation of organo-mineral complexes. In terms of residence time, SOM quality depends on whether it is free or associated to the mineral fraction forming metal (non-allophanic andosols) or allophane complexes (allophanic andosols). This work deals with carbon sequestration mechanisms in volcanic ash soils from the Canary Islands. Physical and chemical soil properties were analysed and SOM studied by analytical pyrolysis (Py-GC/MS) in bulk and in two density fractions. Our findings points to different mechanisms for SOM protection 1) In allophanic soils is mainly associated to noncrystalline organo-mineral complexes, is rich in polysaccharides and N-compounds probably from chitin. 2) In nonallophanic soils a selective preservation mechanism is observed, SOM is formed of relatively unaltered plant components related to a protective effect of amorphous minerals favouring organo-metal complexes/coatings. |
format |
póster de congreso |
author |
González-Pérez, José Antonio Rodríguez-Eugenio, N. González-Vila, Francisco Javier Arbelo, C. D. Rodríguez-Rodríguez, A. |
spellingShingle |
González-Pérez, José Antonio Rodríguez-Eugenio, N. González-Vila, Francisco Javier Arbelo, C. D. Rodríguez-Rodríguez, A. Organic matter in volcanic soils |
author_facet |
González-Pérez, José Antonio Rodríguez-Eugenio, N. González-Vila, Francisco Javier Arbelo, C. D. Rodríguez-Rodríguez, A. |
author_sort |
González-Pérez, José Antonio |
title |
Organic matter in volcanic soils |
title_short |
Organic matter in volcanic soils |
title_full |
Organic matter in volcanic soils |
title_fullStr |
Organic matter in volcanic soils |
title_full_unstemmed |
Organic matter in volcanic soils |
title_sort |
organic matter in volcanic soils |
publisher |
International Humic Substances Society |
publishDate |
2014-09-01 |
url |
http://hdl.handle.net/10261/122433 |
work_keys_str_mv |
AT gonzalezperezjoseantonio organicmatterinvolcanicsoils AT rodriguezeugenion organicmatterinvolcanicsoils AT gonzalezvilafranciscojavier organicmatterinvolcanicsoils AT arbelocd organicmatterinvolcanicsoils AT rodriguezrodrigueza organicmatterinvolcanicsoils |
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