Interplay of coprecipitation and adsorption processes: deciphering amorphous mineral–organic associations under both forest and cropland conditions
<p>Mineral–organic associations are crucial carbon and nutrient reservoirs in soils. However, conversion from forest to agricultural systems disrupts these associations, leading to carbon loss and reduced soil fertility in croplands. Identifying the types of mineral–organic associations within...
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Copernicus Publications
2025-07-01
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| author | F. Jamoteau F. Jamoteau F. Jamoteau F. Jamoteau E. Doelsch E. Doelsch N. Cam C. Levard T. Woignier T. Woignier A. Boulineau F. Saint-Antonin S. Swaraj G. Gassier A. Duvivier D. Borschneck M.-L. Pons P. Chaurand V. Vidal N. Brouilly I. Basile-Doelsch |
| author_facet | F. Jamoteau F. Jamoteau F. Jamoteau F. Jamoteau E. Doelsch E. Doelsch N. Cam C. Levard T. Woignier T. Woignier A. Boulineau F. Saint-Antonin S. Swaraj G. Gassier A. Duvivier D. Borschneck M.-L. Pons P. Chaurand V. Vidal N. Brouilly I. Basile-Doelsch |
| author_sort | F. Jamoteau |
| collection | DOAJ |
| description | <p>Mineral–organic associations are crucial carbon and nutrient reservoirs in soils. However, conversion from forest to agricultural systems disrupts these associations, leading to carbon loss and reduced soil fertility in croplands. Identifying the types of mineral–organic associations within a single soil is already challenging, and detecting those susceptible to disruption during forest-to-crop conversion is even more complex. Yet, addressing this identification challenge is essential for devising strategies to preserve organic matter in croplands. Here, we aimed to identify the predominant mineral–organic associations within an Andosol (developed on Fe-poor parent material) under both forest and cropland conditions. To achieve this, we collected Andosol samples from both a forested and a cultivated area, located 300 m apart. We then analyzed differences between the two soil profiles in soil physicochemical parameters and characterized mineral–organic associations using an array of spectro-microscopic techniques for comprehensive structural and compositional analysis. At microscale and nanoscale spatial resolution, we observed mineral–organic associations in the form of amorphous coprecipitates, composed of a mix of C<span class="inline-formula">+</span>Al<span class="inline-formula">+</span>Si and C<span class="inline-formula">+</span>Al<span class="inline-formula">+</span>Fe<span class="inline-formula">+</span>Si nanoCLICs (inorganic oligomers with organics), proto-imogolites and organic matter, some Fe nanophases associated with organic matter, and some metal–organic complexes. This challenges prior conceptions of mineral–organic associations in Andosols by demonstrating the presence of amorphous coprecipitates rather than solely organic matter associated with short-range-order minerals (i.e., imogolite and allophanes). Moreover, chemical mappings suggested that these amorphous coprecipitates may adhere to mineral surfaces (i.e., phyllosilicates and imogolites), revealing secondary interactions of mineral–organic associations in soils. While the presence of similar amorphous coprecipitates in both the forest and crop Andosols was confirmed, the crop soil had 75 % less C in mineral–organic associations (in the 0–30 cm depth). Although the sample size for comparing land use types is limited, these results suggest that the nature of mineral–organic associations remains identical despite quantitative differences. This study highlights the crucial role of<span id="page536"/> amorphous coprecipitates in C stabilization in Andosols and also suggests their vulnerability to disruption after 30 years of a forest-to-crop conversion, thereby challenging our understanding of the persistence of mineral–organic associations in Andosols.</p> |
| format | Article |
| id | doaj-art-a3795edd40cc4ec6b255520d31502017 |
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| issn | 2199-3971 2199-398X |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Copernicus Publications |
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| series | SOIL |
| spelling | doaj-art-a3795edd40cc4ec6b255520d315020172025-08-20T03:13:22ZengCopernicus PublicationsSOIL2199-39712199-398X2025-07-011153555210.5194/soil-11-535-2025Interplay of coprecipitation and adsorption processes: deciphering amorphous mineral–organic associations under both forest and cropland conditionsF. Jamoteau0F. Jamoteau1F. Jamoteau2F. Jamoteau3E. Doelsch4E. Doelsch5N. Cam6C. Levard7T. Woignier8T. Woignier9A. Boulineau10F. Saint-Antonin11S. Swaraj12G. Gassier13A. Duvivier14D. Borschneck15M.-L. Pons16P. Chaurand17V. Vidal18N. Brouilly19I. Basile-Doelsch20Aix Marseille Université, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, 13545, FranceCIRAD, UPR Recyclage et risque, Montpellier, 34398, FranceRecyclage et Risque, Univ Montpellier, CIRAD, Montpellier, 34398, FranceInstitute of Earth Surface Dynamics, University of Lausanne, Lausanne, 1015, SwitzerlandCIRAD, UPR Recyclage et risque, Montpellier, 34398, FranceRecyclage et Risque, Univ Montpellier, CIRAD, Montpellier, 34398, FranceAix Marseille Université, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, 13545, FranceAix Marseille Université, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, 13545, FranceCampus Agro Environnemental Caraïbes-IMBE-CNRS, B.P. 214, Petit Morne, Le Lamentin, Martinique, 97232, FranceLaboratoire Charles Coulomb UMR 5221 CNRS-UM2, Université Montpellier 2, Montpellier CEDEX 5, 34095, FranceUniversité Grenoble Alpes, CEA, LITEN, Grenoble, 38100, FranceUniversité Grenoble Alpes, CEA, LITEN, Grenoble, 38100, FranceSynchrotron SOLEIL, L'Orme des Merisiers, Departementale 128, Saint-Aubin, 91190, France Aix Marseille Université, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, 13545, FranceAix Marseille Université, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, 13545, FranceAix Marseille Université, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, 13545, FranceAix Marseille Université, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, 13545, FranceAix Marseille Université, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, 13545, FranceAix Marseille Université, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, 13545, FranceAix-Marseille Université, CNRS UMR 7288, IBDM, Marseille, 13000, FranceAix Marseille Université, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, 13545, France<p>Mineral–organic associations are crucial carbon and nutrient reservoirs in soils. However, conversion from forest to agricultural systems disrupts these associations, leading to carbon loss and reduced soil fertility in croplands. Identifying the types of mineral–organic associations within a single soil is already challenging, and detecting those susceptible to disruption during forest-to-crop conversion is even more complex. Yet, addressing this identification challenge is essential for devising strategies to preserve organic matter in croplands. Here, we aimed to identify the predominant mineral–organic associations within an Andosol (developed on Fe-poor parent material) under both forest and cropland conditions. To achieve this, we collected Andosol samples from both a forested and a cultivated area, located 300 m apart. We then analyzed differences between the two soil profiles in soil physicochemical parameters and characterized mineral–organic associations using an array of spectro-microscopic techniques for comprehensive structural and compositional analysis. At microscale and nanoscale spatial resolution, we observed mineral–organic associations in the form of amorphous coprecipitates, composed of a mix of C<span class="inline-formula">+</span>Al<span class="inline-formula">+</span>Si and C<span class="inline-formula">+</span>Al<span class="inline-formula">+</span>Fe<span class="inline-formula">+</span>Si nanoCLICs (inorganic oligomers with organics), proto-imogolites and organic matter, some Fe nanophases associated with organic matter, and some metal–organic complexes. This challenges prior conceptions of mineral–organic associations in Andosols by demonstrating the presence of amorphous coprecipitates rather than solely organic matter associated with short-range-order minerals (i.e., imogolite and allophanes). Moreover, chemical mappings suggested that these amorphous coprecipitates may adhere to mineral surfaces (i.e., phyllosilicates and imogolites), revealing secondary interactions of mineral–organic associations in soils. While the presence of similar amorphous coprecipitates in both the forest and crop Andosols was confirmed, the crop soil had 75 % less C in mineral–organic associations (in the 0–30 cm depth). Although the sample size for comparing land use types is limited, these results suggest that the nature of mineral–organic associations remains identical despite quantitative differences. This study highlights the crucial role of<span id="page536"/> amorphous coprecipitates in C stabilization in Andosols and also suggests their vulnerability to disruption after 30 years of a forest-to-crop conversion, thereby challenging our understanding of the persistence of mineral–organic associations in Andosols.</p>https://soil.copernicus.org/articles/11/535/2025/soil-11-535-2025.pdf |
| spellingShingle | F. Jamoteau F. Jamoteau F. Jamoteau F. Jamoteau E. Doelsch E. Doelsch N. Cam C. Levard T. Woignier T. Woignier A. Boulineau F. Saint-Antonin S. Swaraj G. Gassier A. Duvivier D. Borschneck M.-L. Pons P. Chaurand V. Vidal N. Brouilly I. Basile-Doelsch Interplay of coprecipitation and adsorption processes: deciphering amorphous mineral–organic associations under both forest and cropland conditions SOIL |
| title | Interplay of coprecipitation and adsorption processes: deciphering amorphous mineral–organic associations under both forest and cropland conditions |
| title_full | Interplay of coprecipitation and adsorption processes: deciphering amorphous mineral–organic associations under both forest and cropland conditions |
| title_fullStr | Interplay of coprecipitation and adsorption processes: deciphering amorphous mineral–organic associations under both forest and cropland conditions |
| title_full_unstemmed | Interplay of coprecipitation and adsorption processes: deciphering amorphous mineral–organic associations under both forest and cropland conditions |
| title_short | Interplay of coprecipitation and adsorption processes: deciphering amorphous mineral–organic associations under both forest and cropland conditions |
| title_sort | interplay of coprecipitation and adsorption processes deciphering amorphous mineral organic associations under both forest and cropland conditions |
| url | https://soil.copernicus.org/articles/11/535/2025/soil-11-535-2025.pdf |
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