| Texto completo | |
| Autor(es): |
Barreto, Matheus Sampaio C.
;
Elzinga, Evert J.
;
Rouff, Ashaki A.
;
Siebecker, Matthew G.
;
Sparks, Donald L.
;
Alleoni, Luis Reynaldo F.
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Science of The Total Environment; v. 916, p. 11-pg., 2024-01-26. |
| Resumo | |
Agriculture in highly weathered tropical soils often requires considerable application of lime and fertilizers to ensure satisfactory plant nutrient levels. The consequences of these continue long-term applications is not well understood may induce changes in soil chemical properties, the abundance, and speciation of potentially toxic trace element and as well as of micronutrients in agriculture soils. In this study, we evaluated the adsorption (at pH 5) and speciation of Zn in tropical soils (both agricultural and native vegetation) as a function of fertilization and contact time using chemical fractionation analyses and X-ray absorption spectroscopy. The soils overall had high Zn adsorption capacities (similar to 700 mg kg (-1)), but the agricultural soil was approximately 30 % higher than of the soil under native vegetation, and the proportion of Zn in the mobile fraction was 35 % in native vegetation and 21 % in agricultural soils. Zn speciation via linear combination analysis showed a strong relationship with soil mineralogical composition and reveled that Zn associated with organic matter decreased while Zn associated with P increased after the conversion of soils from native vegetation to highly fertilized soil. Aluminosilicate soil minerals were identified as major sinks of soil Zn, accounting for 34 % of total Zn retention regardless of soil origin and land use. Association of Zn with phosphate (i.e., hopeite) was observed in the agricultural soil (AU) | |
| Processo FAPESP: | 16/05870-1 - ESPECIAÇÃO E CINÉTICA DE ADSORÇÃO E DESSORÇÃO DE Cd E DE Zn EM SOLOS DE ÁREAS OLERÍCOLAS ALTAMENTE FERTILIZADAS |
| Beneficiário: | Matheus Sampaio Carneiro Barreto |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 16/22058-9 - Adsorção e dessorção de Cd e Zn em solos tropicais altamente fertilizados |
| Beneficiário: | Matheus Sampaio Carneiro Barreto |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |