Variations in soil chemical and physical properties explain basin-wide Amazon forest soil carbon concentrations
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.5194/soil-6-53-2020 http://hdl.handle.net/11449/196588 |
Resumo: | We investigate the edaphic, mineralogical and climatic controls of soil organic carbon (SOC) concentration utilising data from 147 primary forest soils (0-30 cm depth) sampled in eight different countries across the Amazon Basin. Sampled across 14 different World Reference Base soil groups, our data suggest that stabilisation mechanism varies with pedogenetic level. Specifically, although SOC concentrations in Ferralsols and Acrisols were best explained by simple variations in clay content - this presumably being due to their relatively uniform kaolinitic mineralogy - this was not the case for less weathered soils such as Alisols, Cambisols and Plinthosols for which interactions between Al species, soil pH and litter quality are argued to be much more important. Although for more strongly weathered soils the majority of SOC is located within the aggregate fraction, for the less weathered soils most of the SOC is located within the silt and clay fractions. It thus seems that for highly weathered soils SOC storage is mostly influenced by surface area variations arising from clay content, with physical protection inside aggregates rendering an additional level of protection against decomposition. On the other hand, most of the SOC in less weathered soils is associated with the precipitation of aluminium-carbon complexes within the fine soil fraction, with this mechanism enhanced by the presence of high levels of aromatic, carboxyl-rich organic matter compounds. Also examined as part of this study were a relatively small number of arenic soils (viz. Arenosols and Podzols) for which there was a small but significant influence of clay and silt content variations on SOM storage, with fractionation studies showing that particulate organic matter may account for up to 0.60 of arenic soil SOC. In contrast to what were in all cases strong influences of soil and/or litter quality properties, after accounting for these effects neither wood productivity, above-ground biomass nor precipitation/temperature variations were found to exert any significant influence on SOC stocks. These results have important implications for our understanding of how Amazon forest soils are likely to respond to ongoing and future climate changes. |
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Variations in soil chemical and physical properties explain basin-wide Amazon forest soil carbon concentrationsWe investigate the edaphic, mineralogical and climatic controls of soil organic carbon (SOC) concentration utilising data from 147 primary forest soils (0-30 cm depth) sampled in eight different countries across the Amazon Basin. Sampled across 14 different World Reference Base soil groups, our data suggest that stabilisation mechanism varies with pedogenetic level. Specifically, although SOC concentrations in Ferralsols and Acrisols were best explained by simple variations in clay content - this presumably being due to their relatively uniform kaolinitic mineralogy - this was not the case for less weathered soils such as Alisols, Cambisols and Plinthosols for which interactions between Al species, soil pH and litter quality are argued to be much more important. Although for more strongly weathered soils the majority of SOC is located within the aggregate fraction, for the less weathered soils most of the SOC is located within the silt and clay fractions. It thus seems that for highly weathered soils SOC storage is mostly influenced by surface area variations arising from clay content, with physical protection inside aggregates rendering an additional level of protection against decomposition. On the other hand, most of the SOC in less weathered soils is associated with the precipitation of aluminium-carbon complexes within the fine soil fraction, with this mechanism enhanced by the presence of high levels of aromatic, carboxyl-rich organic matter compounds. Also examined as part of this study were a relatively small number of arenic soils (viz. Arenosols and Podzols) for which there was a small but significant influence of clay and silt content variations on SOM storage, with fractionation studies showing that particulate organic matter may account for up to 0.60 of arenic soil SOC. In contrast to what were in all cases strong influences of soil and/or litter quality properties, after accounting for these effects neither wood productivity, above-ground biomass nor precipitation/temperature variations were found to exert any significant influence on SOC stocks. These results have important implications for our understanding of how Amazon forest soils are likely to respond to ongoing and future climate changes.Natural Environment Research CouncilGordon and Betty Moore FoundationEuropean Research CouncilEU Seventh Framework ProgrammeRoyal Society of London Research Merit AwardSao Paulo Excellence ChairInst Nacl de Pesquisas da Amazonia, Cx Postal 2223, BR-69080971 Manaus, Amazonas, BrazilUniv Estadual Paulista, Dept Ecol, BR-15506900 Rio Claro, SP, BrazilUniv Leeds, Sch Geog, Leeds LS2 9JT, W Yorkshire, EnglandImperial Coll London, Dept Life Sci, Silwood Pk Campus,Buckhurst Rd, Ascot SL5 7PY, Berks, EnglandUniv Catolica Santisima Concepcion, Fac Sci, Dept Environm Chem, Concepcion, ChileJames Cook Univ, Sch Trop & Marine Sci, Cairns, Qld 4870, AustraliaJames Cook Univ, Ctr Terr Environm & Sustainabil Sci, Cairns, Qld 4870, AustraliaUniv Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Av Bandeirantes 3900, BR-14040901 Ribeirao Preto, SP, BrazilUniv Estadual Paulista, Dept Ecol, BR-15506900 Rio Claro, SP, BrazilNatural Environment Research Council: NE/D005590/1Natural Environment Research Council: NE/B503384/1Natural Environment Research Council: NE/D01025X/1Natural Environment Research Council: NE/I02982X/1Natural Environment Research Council: NE/F005806/1Natural Environment Research Council: NE/I028122/1Gordon and Betty Moore Foundation: 1656European Research Council: 291585EU Seventh Framework Programme: GEOCARBON283080EU Seventh Framework Programme: AMAZALERT-282664Copernicus Gesellschaft MbhInst Nacl de Pesquisas da AmazoniaUniversidade Estadual Paulista (Unesp)Univ LeedsImperial Coll LondonUniv Catolica Santisima ConcepcionJames Cook UnivUniversidade de São Paulo (USP)Quesada, Carlos AlbertoPaz, Claudia [UNESP]Mendoza, Erick OblitasPhillips, Oliver LawrenceSaiz, GustavoLloyd, Jon2020-12-10T19:49:41Z2020-12-10T19:49:41Z2020-02-11info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article53-88http://dx.doi.org/10.5194/soil-6-53-2020Soil. Gottingen: Copernicus Gesellschaft Mbh, v. 6, n. 1, p. 53-88, 2020.2199-3971http://hdl.handle.net/11449/19658810.5194/soil-6-53-2020WOS:000514115500001Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengSoilinfo:eu-repo/semantics/openAccess2021-10-23T08:25:02Zoai:repositorio.unesp.br:11449/196588Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T08:25:02Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Variations in soil chemical and physical properties explain basin-wide Amazon forest soil carbon concentrations |
title |
Variations in soil chemical and physical properties explain basin-wide Amazon forest soil carbon concentrations |
spellingShingle |
Variations in soil chemical and physical properties explain basin-wide Amazon forest soil carbon concentrations Quesada, Carlos Alberto |
title_short |
Variations in soil chemical and physical properties explain basin-wide Amazon forest soil carbon concentrations |
title_full |
Variations in soil chemical and physical properties explain basin-wide Amazon forest soil carbon concentrations |
title_fullStr |
Variations in soil chemical and physical properties explain basin-wide Amazon forest soil carbon concentrations |
title_full_unstemmed |
Variations in soil chemical and physical properties explain basin-wide Amazon forest soil carbon concentrations |
title_sort |
Variations in soil chemical and physical properties explain basin-wide Amazon forest soil carbon concentrations |
author |
Quesada, Carlos Alberto |
author_facet |
Quesada, Carlos Alberto Paz, Claudia [UNESP] Mendoza, Erick Oblitas Phillips, Oliver Lawrence Saiz, Gustavo Lloyd, Jon |
author_role |
author |
author2 |
Paz, Claudia [UNESP] Mendoza, Erick Oblitas Phillips, Oliver Lawrence Saiz, Gustavo Lloyd, Jon |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Inst Nacl de Pesquisas da Amazonia Universidade Estadual Paulista (Unesp) Univ Leeds Imperial Coll London Univ Catolica Santisima Concepcion James Cook Univ Universidade de São Paulo (USP) |
dc.contributor.author.fl_str_mv |
Quesada, Carlos Alberto Paz, Claudia [UNESP] Mendoza, Erick Oblitas Phillips, Oliver Lawrence Saiz, Gustavo Lloyd, Jon |
description |
We investigate the edaphic, mineralogical and climatic controls of soil organic carbon (SOC) concentration utilising data from 147 primary forest soils (0-30 cm depth) sampled in eight different countries across the Amazon Basin. Sampled across 14 different World Reference Base soil groups, our data suggest that stabilisation mechanism varies with pedogenetic level. Specifically, although SOC concentrations in Ferralsols and Acrisols were best explained by simple variations in clay content - this presumably being due to their relatively uniform kaolinitic mineralogy - this was not the case for less weathered soils such as Alisols, Cambisols and Plinthosols for which interactions between Al species, soil pH and litter quality are argued to be much more important. Although for more strongly weathered soils the majority of SOC is located within the aggregate fraction, for the less weathered soils most of the SOC is located within the silt and clay fractions. It thus seems that for highly weathered soils SOC storage is mostly influenced by surface area variations arising from clay content, with physical protection inside aggregates rendering an additional level of protection against decomposition. On the other hand, most of the SOC in less weathered soils is associated with the precipitation of aluminium-carbon complexes within the fine soil fraction, with this mechanism enhanced by the presence of high levels of aromatic, carboxyl-rich organic matter compounds. Also examined as part of this study were a relatively small number of arenic soils (viz. Arenosols and Podzols) for which there was a small but significant influence of clay and silt content variations on SOM storage, with fractionation studies showing that particulate organic matter may account for up to 0.60 of arenic soil SOC. In contrast to what were in all cases strong influences of soil and/or litter quality properties, after accounting for these effects neither wood productivity, above-ground biomass nor precipitation/temperature variations were found to exert any significant influence on SOC stocks. These results have important implications for our understanding of how Amazon forest soils are likely to respond to ongoing and future climate changes. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-10T19:49:41Z 2020-12-10T19:49:41Z 2020-02-11 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.5194/soil-6-53-2020 Soil. Gottingen: Copernicus Gesellschaft Mbh, v. 6, n. 1, p. 53-88, 2020. 2199-3971 http://hdl.handle.net/11449/196588 10.5194/soil-6-53-2020 WOS:000514115500001 |
url |
http://dx.doi.org/10.5194/soil-6-53-2020 http://hdl.handle.net/11449/196588 |
identifier_str_mv |
Soil. Gottingen: Copernicus Gesellschaft Mbh, v. 6, n. 1, p. 53-88, 2020. 2199-3971 10.5194/soil-6-53-2020 WOS:000514115500001 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Soil |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
53-88 |
dc.publisher.none.fl_str_mv |
Copernicus Gesellschaft Mbh |
publisher.none.fl_str_mv |
Copernicus Gesellschaft Mbh |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
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Repositório Institucional da UNESP |
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Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
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1803649609084436480 |