Phosphorus pools responses to land-use change for sugarcane expansion in weathered Brazilian soils

Autor(es)

Cherubin, Mauricio R. ^[1] ; Franco, Andre L. C. ^[2] ; Cerri, Carlos E. P. ^[1] ; Karlen, Douglas L. ^[3] ; Pavinato, Paulo S. ^[1] ; Rodrigues, Marcos ^[1] ; Davies, Christian A. ^[4] ; Cerri, Carlos C. ^[5]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Dept Soil Sci, BR-13418900 Piracicaba, SP - Brazil

^[2] Colorado State Univ, Dept Biol, Ft Collins, CO 80523 - USA

^[3] USDA, Agr Res Serv, Natl Lab Agr & Environm, Ames, IA 50011 - USA

^[4] Shell Technol Ctr Houston, Houston, TX 77082 - USA

^[5] Univ Sao Paulo, Ctr Nucl Energy Agr, BR-13400970 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Geoderma; v. 265, p. 27-38, MAR 1 2016.
• Citações Web of Science: 18

Resumo

Without proper management, land-use change (LUC) associated with producing sugarcane (Saccharum officinarum) for bioenergy in Brazil can lead to soil degradation and have negative implications on ecosystem functions. Phosphorus (P) depletion is one of the most frequent causes of land degradation in tropical environments, and as such, soil P pools have been identified as potential indicators of negative environmental impacts. We quantified soil P dynamics for the most common LUC sequence in sugarcane expansion areas {[}i.e., native vegetation (NV) to pasture (PA) to sugarcane (SC)], to determine if and how these changes could be used to evaluate environmental impacts of LUC in weathered Brazilian soils. Soil samples were collected from three areas in central-southern Brazil, representing the primary sugarcane-producing region of the world. Soil P fractionation was performed, and P stocks were calculated for the surface 30 cm. Soil chemical attributes and macrofauna data were correlated with P pools. Long-term conversions from natural ecosystems (Cerrado and Atlantic forest biome) to extensive PA decreased total P stocks by 31.2% indicating progressive soil degradation in these areas. In contrast, the LUC from PA to SC increased total P stocks by 35.6%; nevertheless, fertilization management altered the soil P-cycle, causing P accumulation in less plant-available forms. Available P increases to support adequate SC growth are still needed. Applying P using organic residues increased labile organic P and may be a complementary strategy for increasing nutrient supplies in SC fields. Phosphorus availability showed significant positive correlations with other soil chemical properties and clay content, while the functional diversity of soil macrofauna was strongly correlated with labile and biological P. We conclude that P pools can be useful indicators for assessing LUC modifications on soil quality in the tropics, and recommend they be used to assess land degradation and environmental sustainability within SC expansion areas in Brazil. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 12/22510-8 - Macroinvertebrados e os processos de engenharia do solo: controles sobre a estocagem de matéria orgânica do solo em áreas com mudanças no uso da terra
• Beneficiário: Andre Luiz Custodio Franco
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/16612-8 - Resposta de indicadores de qualidade do solo a mudança de uso da terra
• Beneficiário: Maurício Roberto Cherubin
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 13/17581-6 - QUALIDADE DO SOLO EM ÁREAS DE MUDANÇA DE USO DA TERRA PARA CULTIVO DA CANA-DE-AÇÚCAR NO CENTRO-SUL DO BRASIL - bases para avaliação da sustentabilidade ambiental do etanol
• Beneficiário: Maurício Roberto Cherubin
• Modalidade de apoio: Bolsas no Brasil - Doutorado