| Full text | |
| Author(s): |
Pinheiro Junior, C. Roberto
;
Ferreira, Tiago Osorio
;
Oliveira Filho, Jose de Souza
;
Queiroz, Hermano Melo
;
Canisares, Lucas Pecci
;
Greschuk, Lucas T.
;
Cerri, Carlos Eduardo Pellegrino
;
Pereira, Marcos Gervasio
;
Pereira, Goncalo Amarante Guimaraes
;
Cherubin, Mauricio Roberto
Total Authors: 10
|
| Document type: | Journal article |
| Source: | GEODERMA REGIONAL; v. 38, p. 9-pg., 2024-08-14. |
| Abstract | |
Shallow soils (i.e., Lithic Entisols) cover about 20% of Brazilian drylands. Inherent soil characteristics (i.e., shallow depths) and water scarcity restrict plant growth and carbon (C) inputs in these soils. In such a sensitive ecosystem, sustainable land management options are key to promoting socio-economic development and ensuring food security. Here, we use a dataset of 50 Lithic Entisol profiles distributed within the Brazilian drylands (northeastern region) to: (i) investigate the effects of land-use (cropland, grassland, and native forest), climate (semi-arid and dry sub-humid), and slope classes (0-3%, 3-8%, 8-20% and 20-45%) on soil C accumulation; and (ii) evaluate how understanding multiple drivers C accumulation can support the identification of sustainable land management options. The results suggested that land use does not affect C stock and C/N ratio, nevertheless, they were affected by climate. Under dry sub-humid climate conditions, C stocks were 41.7 Mg ha(-1), 44% higher than under semi-arid climate (28.9 Mg ha(-1)), a result that reflects the effect of higher biomass production in wetter environments. Under slopes of 20-45%, C stocks were 54.3 Mg ha(-1), 172% higher than under slopes of 0-3% (19.9 Mg ha(-1)), because of the higher altitudes and wetter conditions under steeper slopes. Our results showed that areas under lower slopes have lower C stocks and lower aridity index. These drier conditions reduce the productive potential of annual crops and grasslands but enable the cultivation of high-yielding Crassulacean Acid Metabolism (CAM) crops, such as Agave spp, which have a high potential for biofuel production. Furthermore, the possibility of reintroducing organic residues from ethanol production can promote an increase in C stocks, contributing to climate change mitigation. Ultimately, our study provides insights from a holistic view of SOC accumulation drivers, supporting land use planning of highly sensitive environments in tropical drylands around the world. (AU) | |
| FAPESP's process: | 23/11337-8 - Effect of land use change and sugarcane management practices on soil C, soil health and associated ecosystem services: an evidence synthesis |
| Grantee: | Carlos Roberto Pinheiro Junior |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 23/08814-9 - MONS: Mechanisms of nitrous oxide emission in tropical soil |
| Grantee: | Lucas Pecci Canisares |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 23/00438-8 - Soil carbon sequestration under integrated agricultural systems in Brazilian drylands |
| Grantee: | Lucas Tadeu Greschuk |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 21/10573-4 - Center for Carbon Research in Tropical Agriculture (CCARBON) |
| Grantee: | Carlos Eduardo Pellegrino Cerri |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |