| Texto completo | |
| Autor(es): |
Martinez, Pedro
[1, 2]
;
Buurman, Peter
[3]
;
do Nascimento, Diego Luciano
[4]
;
Almquist, Vance
[2]
;
Vidal-Torrado, Pablo
[1]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Escola Super Agr Luiz Queiroz ESALQ USP, Dept Ciencia Solo, Av Padua Dias 11, Piracicaba, SP - Brazil
[2] Oregon State Univ, Dept Crop & Soil Sci, 2750 Campus Way, Corvallis, OR 97331 - USA
[3] Wageningen Univ, Water Syst & Global Change Grp, POB 47, NL-6700 AA Wageningen - Netherlands
[4] ICHNOS Res Grp, Inst Geociencias, Dept Geol & Recursos Nat, UNICAMP, Rua Joao Pandia Calogeras 51, Campinas, SP - Brazil
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PLANT AND SOIL; v. 463, n. 1-2 MAR 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
Aims We investigated morphological variations in podzols caused by changes in soil porosity and permeability upon the growth of large tree-roots in a tropical barrier island (Ilha Comprida, Brazil). Methods Soil morphology was described in a continuous lateral sequence of podzols on a 35 m-long cliff. A soil thin section was used to characterize organic matter (OM) accumulation and to estimate soil porosity, permeability, and saturated hydraulic conductivity (Ksat). Soil texture and the contents of organic carbon, Al, and Fe were determined for each pedogenic horizon containing large tree-roots. The evolution of podzol morphology was interpreted in the context of age determinations by optically stimulated luminescence and C-14. Results Taproots of cashew trees (Anacardium occidenkde) penetrated the cemented Bhm horizon and the massive-clayey 2Cgj horizon. Aligned with the tap-root, we found a vertical OM-band with lower porosity, permeability, and Ksat than the adjacent Bh and E horizons. Irregular or broken boundaries between the E and Bh horizons were caused by large tree-roots. While the maximum age of these podzols is 3390 +/- 530 years, significant and rapid changes in the Bh-horizon morphology occurred within the lifetime of the cashew trees (similar to 50 years). Conclusions The interplay between reduction in flow adjacent to large taproots and the enhanced vertical infiltration at depth has resulted into the development of irregular and broken boundaries between the E and Bh horizons. Because tree-roots alter both local soil porosity and water flow paths, they simultaneously cause the formation and degradation of podzol Bh-horizon. (AU) | |
| Processo FAPESP: | 12/50276-0 - Podzolização em solos sob vegetação de restinga: relações entre a variação de drenagem, acumulação e composição da matéria orgânica em Espodossolos na Ilha Comprida - SP |
| Beneficiário: | Pablo Vidal Torrado |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |