Iron oxides and aluminous clays selectively control soil carbon storage and stability in the humid tropics

Abstract Clay minerals and pedogenic metal (oxyhydr)oxides are the most reactive soil mineral constituents controlling the long-term persistence of organic carbon (OC) in terrestrial ecosystems. However, their co-occurrence in most soils complicates direct assessment of their individual contribution...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Maximilian Kirsten, Robert Mikutta, Cordula Vogel, Aaron Thompson, Carsten W. Mueller, Didas N. Kimaro, Huig L. T. Bergsma, Karl-Heinz Feger, Karsten Kalbitz
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/31989b93a3c64607ad5ba5b1b7b25a88
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:31989b93a3c64607ad5ba5b1b7b25a88
record_format	dspace
spelling	oai:doaj.org-article:31989b93a3c64607ad5ba5b1b7b25a882021-12-02T13:34:46ZIron oxides and aluminous clays selectively control soil carbon storage and stability in the humid tropics10.1038/s41598-021-84777-72045-2322https://doaj.org/article/31989b93a3c64607ad5ba5b1b7b25a882021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84777-7https://doaj.org/toc/2045-2322Abstract Clay minerals and pedogenic metal (oxyhydr)oxides are the most reactive soil mineral constituents controlling the long-term persistence of organic carbon (OC) in terrestrial ecosystems. However, their co-occurrence in most soils complicates direct assessment of their individual contribution to OC persistence. Making use of unique mineralogical combinations in soils located in the East Usambara Mountains of Tanzania, we disentangled the contribution of clay-sized aluminous minerals (kaolinite, gibbsite) and pedogenic Fe (oxyhydr)oxides (predominant goethite and hematite) on OC storage and stabilization under natural forests and croplands. Topsoil samples, varying in contents but not types of aluminous clays and pedogenic Fe (oxyhydr)oxides, were identified by selective extractions, X-ray diffraction, and Mössbauer spectroscopy. Associated abundance of particulate and mineral-associated organic matter (OM) was quantified by density fractionation and their changes during land-use conversion were determined as a measure of OC persistence. Additionally, we assessed the resistance of OC to chemical oxidation as well as microbial decomposition in a 50-day laboratory incubation. We found that the ratio of pedogenic Fe to aluminous clay is more consequential for OC storage and stabilization than their individual contents, despite the fact that Fe (oxyhydr)oxides generally exert a stronger impact on OC than aluminous clays. Conjunction of large amounts of Fe (oxyhydr)oxides with low aluminous clay contents caused the strongest accumulation of mineral-associated OC, a low soil respiration, high OC stability against chemical oxidation, and high OC persistence during land-use change. Our study suggests that certain mineralogical combinations in the humid tropics alleviate OM losses during land conversion because of the strong and selective mineral control on OC stabilization, particular if the weight ratio of pedogenic Fe to aluminous clay exceeds the threshold range of 0.44‒0.56.Maximilian KirstenRobert MikuttaCordula VogelAaron ThompsonCarsten W. MuellerDidas N. KimaroHuig L. T. BergsmaKarl-Heinz FegerKarsten KalbitzNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Maximilian Kirsten Robert Mikutta Cordula Vogel Aaron Thompson Carsten W. Mueller Didas N. Kimaro Huig L. T. Bergsma Karl-Heinz Feger Karsten Kalbitz Iron oxides and aluminous clays selectively control soil carbon storage and stability in the humid tropics
description	Abstract Clay minerals and pedogenic metal (oxyhydr)oxides are the most reactive soil mineral constituents controlling the long-term persistence of organic carbon (OC) in terrestrial ecosystems. However, their co-occurrence in most soils complicates direct assessment of their individual contribution to OC persistence. Making use of unique mineralogical combinations in soils located in the East Usambara Mountains of Tanzania, we disentangled the contribution of clay-sized aluminous minerals (kaolinite, gibbsite) and pedogenic Fe (oxyhydr)oxides (predominant goethite and hematite) on OC storage and stabilization under natural forests and croplands. Topsoil samples, varying in contents but not types of aluminous clays and pedogenic Fe (oxyhydr)oxides, were identified by selective extractions, X-ray diffraction, and Mössbauer spectroscopy. Associated abundance of particulate and mineral-associated organic matter (OM) was quantified by density fractionation and their changes during land-use conversion were determined as a measure of OC persistence. Additionally, we assessed the resistance of OC to chemical oxidation as well as microbial decomposition in a 50-day laboratory incubation. We found that the ratio of pedogenic Fe to aluminous clay is more consequential for OC storage and stabilization than their individual contents, despite the fact that Fe (oxyhydr)oxides generally exert a stronger impact on OC than aluminous clays. Conjunction of large amounts of Fe (oxyhydr)oxides with low aluminous clay contents caused the strongest accumulation of mineral-associated OC, a low soil respiration, high OC stability against chemical oxidation, and high OC persistence during land-use change. Our study suggests that certain mineralogical combinations in the humid tropics alleviate OM losses during land conversion because of the strong and selective mineral control on OC stabilization, particular if the weight ratio of pedogenic Fe to aluminous clay exceeds the threshold range of 0.44‒0.56.
format	article
author	Maximilian Kirsten Robert Mikutta Cordula Vogel Aaron Thompson Carsten W. Mueller Didas N. Kimaro Huig L. T. Bergsma Karl-Heinz Feger Karsten Kalbitz
author_facet	Maximilian Kirsten Robert Mikutta Cordula Vogel Aaron Thompson Carsten W. Mueller Didas N. Kimaro Huig L. T. Bergsma Karl-Heinz Feger Karsten Kalbitz
author_sort	Maximilian Kirsten
title	Iron oxides and aluminous clays selectively control soil carbon storage and stability in the humid tropics
title_short	Iron oxides and aluminous clays selectively control soil carbon storage and stability in the humid tropics
title_full	Iron oxides and aluminous clays selectively control soil carbon storage and stability in the humid tropics
title_fullStr	Iron oxides and aluminous clays selectively control soil carbon storage and stability in the humid tropics
title_full_unstemmed	Iron oxides and aluminous clays selectively control soil carbon storage and stability in the humid tropics
title_sort	iron oxides and aluminous clays selectively control soil carbon storage and stability in the humid tropics
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/31989b93a3c64607ad5ba5b1b7b25a88
work_keys_str_mv	AT maximiliankirsten ironoxidesandaluminousclaysselectivelycontrolsoilcarbonstorageandstabilityinthehumidtropics AT robertmikutta ironoxidesandaluminousclaysselectivelycontrolsoilcarbonstorageandstabilityinthehumidtropics AT cordulavogel ironoxidesandaluminousclaysselectivelycontrolsoilcarbonstorageandstabilityinthehumidtropics AT aaronthompson ironoxidesandaluminousclaysselectivelycontrolsoilcarbonstorageandstabilityinthehumidtropics AT carstenwmueller ironoxidesandaluminousclaysselectivelycontrolsoilcarbonstorageandstabilityinthehumidtropics AT didasnkimaro ironoxidesandaluminousclaysselectivelycontrolsoilcarbonstorageandstabilityinthehumidtropics AT huigltbergsma ironoxidesandaluminousclaysselectivelycontrolsoilcarbonstorageandstabilityinthehumidtropics AT karlheinzfeger ironoxidesandaluminousclaysselectivelycontrolsoilcarbonstorageandstabilityinthehumidtropics AT karstenkalbitz ironoxidesandaluminousclaysselectivelycontrolsoilcarbonstorageandstabilityinthehumidtropics
_version_	1718392726130524160

Iron oxides and aluminous clays selectively control soil carbon storage and stability in the humid tropics

Ejemplares similares