| Texto completo | |
| Autor(es): |
Bordonal, Ricardo O.
;
Dor, Maoz
;
Guber, Andrey K.
;
Cherubin, Mauricio R.
;
Nascimento, Alexandre F.
;
Tenelli, Sarah
;
La Scala, Newton
;
Cerri, Carlos E. P.
;
Carvalho, Joao L. N.
;
Kravchenko, Alexandra N.
Número total de Autores: 10
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Environmental Management; v. 397, p. 13-pg., 2026-01-01. |
| Resumo | |
Integrating well-managed grass into agricultural systems is a management target for enhancing soil carbon (C) storage in tropical agroecosystems. Yet, the mechanisms behind physical protection of soil C are not sufficiently lucid. Here we analyzed pore structure and particulate organic matter (POM) characteristics in structurally intact soil using synchrotron X-ray computed micro-tomography (mu CT). We combined these analyses with bulk measurements and CO2 respiration data to explore the interactions between pore structure and soil C characteristics in a mid-term experiment in the Southern Amazon, Brazil. The farming systems were: (i) crop succession (CS) with annual production of soybeans followed by corn; (ii) integrated crop-livestock (ICL) with soybeans and then corn intercropped with palisade grass; and (iii) well-managed pasture (MP) with continuous monoculture of palisade grass. Soils of ICL and MP exhibited higher soil C (18-27 %) and N (27-29 %) contents, along with increased microbial biomass C (25-45 %) compared to CS. Additionally, ICL and MP showed higher mu CT-based porosity (26-30 %) than CS and a greater volume of pores in the 70-150 mu m range, which are regarded as optimal microbial habitats. Image-determined POM fractions in ICL and MP were 71 % and 51 % higher compared to CS. The spatial distribution patterns of soil pores and POM influenced the magnitude of soil C decomposition. Greater distances to medium pores and to POM fragments in MP are likely associated with lower soil C losses via CO2 emission, suggesting more effective soil C protection. We surmise that the intricacies of pore networks and their association with the spatial distribution of POM dictate C accrual in soils with greater presence of well-managed grass, thus providing the basis for target-oriented development of management strategies to rebuild soil C in Brazilian agriculture. (AU) | |
| Processo FAPESP: | 21/10573-4 - Centro de Pesquisa de Carbono em Agricultura Tropical (CCARBON) |
| Beneficiário: | Carlos Eduardo Pellegrino Cerri |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 20/15230-5 - Centro de Pesquisa e Inovação de Gases de Efeito Estufa - RCG2I |
| Beneficiário: | Julio Romano Meneghini |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada |
| Processo FAPESP: | 21/12914-3 - Tomografia de raios-X baseada em radiação síncrotron para decifrar os mecanismos de estabilização do carbono em solo tropical |
| Beneficiário: | Ricardo de Oliveira Bordonal |
| Modalidade de apoio: | Bolsas no Exterior - Pesquisa |