Al-/Fe-(hydr)oxides-organic carbon associations in Oxisols - From ecosystems to submicron scales

被引:40
作者
Souza, Ivan F. [1 ]
Archanjo, Braulio S. [2 ]
Hurtarte, Luis C. C. [1 ]
Oliveros, Martin E. [2 ]
Gouvea, Cristol P. [2 ]
Lidizio, Leandro R. [2 ]
Achete, Carlos A. [2 ]
Schaefer, Carlos E. R. [1 ]
Silva, Ivo R. [1 ]
机构
[1] Univ Fed Vicosa, Dept Solos, BR-36570900 Vicosa, MG, Brazil
[2] Inst Nacl Metrol Qualidade & Tecnol INMETRO, Div Metrol Mat DIMAT, BR-25250020 Rio De Janeiro, Brazil
关键词
Al-/Fe-(hydr)oxides; Carbon; Oxisols; Ferralsols; Subtropics; Tropics; SOIL ORGANIC-MATTER; MINERAL ASSOCIATIONS; TEMPERATE SOILS; IRON-OXIDES; STABILIZATION; STORAGE; RETENTION; DYNAMICS; CERRADO; TEXTURE;
D O I
10.1016/j.catena.2017.02.017
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Al-/Fe(hydr)oxides accumulation upon weathering favors soil organic carbon (SOC) protection into mineral-organic associations (MOAs). Paradoxically, tropical ecosystems on highly weathered soils are characterized by high turnover rates of SOC. Our objective was to propose an explanation for such apparent contradiction by inferring the chemical composition of MOAs in Oxisols. To this end, we compiled a large data set from 43 published articles providing chemical and physical properties of 179 Oxisols/Ferralsols and their SOC content in the A horizon. Thermal analysis (TA) coupled to evolved gas detection (EGD) was used to assess mineral dehydroxylation and SOC oxidation in two soils with contrasting SOC content. Scanning transmission electron microscopy (STEM) was used to probe MOAs within the soil fraction <53 mu m. At large scales, SOC content was strongly correlated to Al extractable by both ammonium oxalate (AO) (r = 0.71) and dithionite-citrate-bicarbonate (DCB) (r = 0.41). Weaker, but significant correlations occurred for SOC against Fe-AO and Fe-DCB (r = 0.38, and r = 014, respectively). At micro-scale, SOC also was found associated to Al-/Fe-(hydr)oxides, as inferred from the STEM imaging. TA-EGD indicated that with increasing SOC content, proportionally more organic matter was oxidized following the dehydroxylation of Al-/Fe-(hydr)oxides at temperatures <400 degrees C. Within the first 20 cm of the topsoil of the Oxisols included in our data set, Al-AO explained 62% of the total variation in SOC. However, while SOC content varied from 0.8 up to 145.8 g kg(-1) soil, Al-AO varied between 02 and 153 g kg(-1) soil. From the perspective of mineral control on SOC retention, reactive species of Al-(hydr)oxides should interact with a disproportionally large amount of organic matter. Because mineral protection is seemingly reduced upon increasing SOC content in MOAs, C in Oxisols may be more vulnerable to environmental changes than currently recognized. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:63 / 72
页数:10
相关论文
共 46 条
[1]  
[Anonymous], 2014, Keys to Soil Taxonomy
[2]  
[Anonymous], 2015, WORLD SOIL RESOURCES
[3]  
Archanjo BS, 2015, ENVIRON SCI-PROC IMP, V17, P775, DOI [10.1039/c4em00590b, 10.1039/C4EM00590B]
[4]   Role of the soil matrix and minerals in protecting natural organic materials against biological attack [J].
Baldock, JA ;
Skjemstad, JO .
ORGANIC GEOCHEMISTRY, 2000, 31 (7-8) :697-710
[5]   Impact of phyllosilicate mineralogy on organic carbon stabilization in soils: incomplete knowledge and exciting prospects [J].
Barre, Pierre ;
Fernandez-Ugalde, Oihane ;
Virto, Inigo ;
Velde, Bruce ;
Chenu, Claire .
GEODERMA, 2014, 235 :382-395
[6]   Texture and sesquioxide effects on water-stable aggregates and organic matter in some tropical soils [J].
Barthes, Bernard G. ;
Kouakoua, Ernest ;
Larre-Larrouy, Marie-Christine ;
Razafimbelo, Tantely M. ;
de Luca, Edgar F. ;
Azontonde, Anastase ;
Neves, Carmen S. V. J. ;
de Freitas, Pedro L. ;
Feller, Christian L. .
GEODERMA, 2008, 143 (1-2) :14-25
[7]   PARTICULATE SOIL ORGANIC-MATTER CHANGES ACROSS A GRASSLAND CULTIVATION SEQUENCE [J].
CAMBARDELLA, CA ;
ELLIOTT, ET .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1992, 56 (03) :777-783
[8]   Global covariation of carbon turnover times with climate in terrestrial ecosystems [J].
Carvalhais, Nuno ;
Forkel, Matthias ;
Khomik, Myroslava ;
Bellarby, Jessica ;
Jung, Martin ;
Migliavacca, Mirco ;
Mu, Mingquan ;
Saatchi, Sassan ;
Santoro, Maurizio ;
Thurner, Martin ;
Weber, Ulrich ;
Ahrens, Bernhard ;
Beer, Christian ;
Cescatti, Alessandro ;
Randerson, James T. ;
Reichstein, Markus .
NATURE, 2014, 514 (7521) :213-+
[9]   Integrating plant litter quality, soil organic matter stabilization, and the carbon saturation concept [J].
Castellano, Michael J. ;
Mueller, Kevin E. ;
Olk, Daniel C. ;
Sawyer, John E. ;
Six, Johan .
GLOBAL CHANGE BIOLOGY, 2015, 21 (09) :3200-3209
[10]   Urgent need for warming experiments in tropical forests [J].
Cavaleri, Molly A. ;
Reed, Sasha C. ;
Smith, W. Kolby ;
Wood, Tana E. .
GLOBAL CHANGE BIOLOGY, 2015, 21 (06) :2111-2121