Forest conversion to pasture affects soil phosphorus dynamics and nutritional status in Brazilian Amazon

Autor(es):Mostrar menos -

Soltangheisi, Amin ^[1] ; de Moraes, Moacir Tuzzin ^[1] ; Cherubin, Mauricio Roberto ^[2] ; Alvarez, Dasiel Obregon ^[3] ; de Souza, Leandro Fonseca ^[3] ; Bieluczyk, Wanderlei ^[3] ; Navroski, Deisi ^[3] ; Bettoni Teles, Ana Paula ^[2] ; Pavinato, Paulo Sergio ^[2] ; Martinelli, Luiz Antonio ^[1] ; Tsai, Siu Mui ^[3] ; de Camargo, Plinio Barbosa ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Ecol Isotop, CENA, Av Centenario 303, BR-13416000 Piracicaba, SP - Brazil

^[2] Univ Sao Paulo, Dept Ciencia Solo, ESALQ, Av Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil

^[3] Univ Sao Paulo, CENA, Cell & Mol Biol Lab, Av Centenario 303, BR-13416000 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SOIL & TILLAGE RESEARCH; v. 194, NOV 2019.
• Citações Web of Science: 0

Resumo

Understanding the pathways of soil phosphorus (P) transformations and determining the factors related to P nutritional status of soils when land use changes is critical for a better management, especially in Amazon region. We investigated different P fractions and their transformations in different land uses (primary forest and pasture) and soil textures (clayey and sandy) in Amazonian Oxisols using path analysis. Besides P fractionation, phosphatase activity and its correlation with soil carbon (C):organic P (Po) ratio was evaluated to correlate it with soil P nutritional status. After 15 years from forest slashing and burning, total P in pasture reaches to the forest levels in Amazonian soils, regardless of soil texture. Path analysis showed that land use conversion from forest to pasture decreased the diversity of the contribution of P pools to buffer P extracted by anion exchange resin. However, Po accounted for one-fourth of total P in our sites, it plays an important role as source of plant available P and contributed more in pasture compared to forest. Our results from P fractionation and C:Po ratio revealed that Amazonian pastures and forests are not P deficient. We also showed that with increasing C:Po ratio, plant-available P content became more dependent on P mineralization. Soil acid phosphatase activity can be used as an indicator for evaluating soil P nutritional status; however, its range changes according to the land use. (AU)

• Processo FAPESP: 17/18327-7 - Produção e consumo de CH4 no ecossistema tropical, através de fluxos, perfis verticais de CH4 e suas composições isotópicas 13C e D
• Beneficiário: Moacir Tuzzin de Moraes
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 16/24695-6 - Dinâmica espacial e temporal da microbiota ativa na ciclagem do metano em um solo amazônico após conversão da floresta em pastagem
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• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 17/11332-5 - Dinâmica do fósforo e suas frações em solos sob conversão pastagem-cana e intensificação de pastagens
• Beneficiário: Amin Soltangheisi
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/50320-4 - Dimensões US-BIOTA - São Paulo: pesquisa colaborativa: integrando as dimensões da biodiversidade microbiana ao longo de áreas de alteração do uso da terra em florestas tropicais
• Beneficiário: Tsai Siu Mui
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático