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Registro Completo |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
26/08/2024 |
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Data da última atualização: |
26/08/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SOUSA, J. E. S. de; ARAUJO, J. K. S.; SILVA, A. H. N. da; SANTOS, J. C. B. dos; FERREIRA, T. O.; ARAUJO FILHO, J. C. de; SOUSA, M. G.; OTERO, X. L.; CORREA, M. M.; CAMARGO, P. B. de; SOUZA JÚNIOR, V. S. de. |
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Afiliação: |
JULIET EMILIA SANTOS DE SOUSA, UNIVERSIDADE ESTADUAL DE CAMPINAS; JANE KELLY SILVA ARAUJO, UNIVERSIDADE FEDERAL RURAL DE PERNAMBUCO; ARTUR HENRIQUE NASCIMENTO DA SILVA, UNIVERSIDADE FEDERAL RURAL DE PERNAMBUCO; JEAN CHEYSON BARROS DOS SANTOS, UNIVERSIDADE FEDERAL RURAL DE PERNAMBUCO; TIAGO OSÓRIO FERREIRA, UNIVERSIDADE DE SÃO PAULO; JOSE COELHO DE ARAUJO FILHO, CNPS; MARILYA GABRYELLA SOUSA, UNIVERSIDADE FEDERAL RURAL DE PERNAMBUCO; XOSÉ LOIS OTERO, UNIVERSIDADE DE SANTIAGO DE COMPOSTELA; MARCELO METRI CORREA, UNIVERSIDADE FEDERAL DO AGRESTE DE PERNAMBUCO; PLÍNIO BARBOSA DE CAMARGO, UNIVERSIDADE DE SÃO PAULO; VALDOMIRO SEVERINO DE SOUZA JÚNIOR, UNIVERSIDADE FEDERAL RURAL DE PERNAMBUCO. |
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Título: |
Carbon stocks in Planosols along a rainfall gradient in Northeast Brazil. |
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Ano de publicação: |
2024 |
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Fonte/Imprenta: |
Catena, v. 245, 108295, Oct. 2024. |
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DOI: |
https://doi.org/10.1016/j.catena.2024.108295 |
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Idioma: |
Inglês |
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Conteúdo: |
Planosols have sandy-textured surface horizons that abruptly cover a dense subsoil with high clay content, which usually limits drainage and influences soil moisture. Here, we investigated changes in C storage through the pedogenic horizons of soil profile, including detailed sampling of A and B horizons along a transect to cover rainfall variation (584–1130 mm year−1) and soil cover of Planosols, including dry land areas in Northeast Brazil. The soil profile located under highest precipitation and with the greatest pedogenic development (150 cm) showed the largest C stock (101.91 Mg/ha), surpassing estimates of other soil classes. In addition, our results suggest that soil cover and pedogenesis impact C storage in Planosols. An average of 64 % of C is stored in subsurface horizons that present abundant clay fraction; thus, the dynamics of subsurface soil organic carbon (SOC) appear to be more controlled by soil features than by climate. Values of δ13C indicated the predominance of C3 plant, except in area with sugarcane cultivation (C4 plant). Changes in C distribution within the horizon suggest changes in degree of decomposability of soil organic matter (SOM), mainly in A1 and B1 layers, with A horizon richer in labile compounds. δ15N values indicated that N dynamics differ in the gradient. The thermal analyses showed that around 70 % or more of humin fraction is composed of structures more resistant to degradation, suggesting that C stock in Planosols has relative stability. However, in driest part of the climate transect, SOM may be more vulnerable to losses due to the large relative quantity of aliphatic groups in soil surface and subsurface. This work provides insights into the mechanisms the determine C storage distribution in tropical Planosols and contributes to appropriate use and management of these soils to ensure the valuable ecosystem service of C storage. MenosPlanosols have sandy-textured surface horizons that abruptly cover a dense subsoil with high clay content, which usually limits drainage and influences soil moisture. Here, we investigated changes in C storage through the pedogenic horizons of soil profile, including detailed sampling of A and B horizons along a transect to cover rainfall variation (584–1130 mm year−1) and soil cover of Planosols, including dry land areas in Northeast Brazil. The soil profile located under highest precipitation and with the greatest pedogenic development (150 cm) showed the largest C stock (101.91 Mg/ha), surpassing estimates of other soil classes. In addition, our results suggest that soil cover and pedogenesis impact C storage in Planosols. An average of 64 % of C is stored in subsurface horizons that present abundant clay fraction; thus, the dynamics of subsurface soil organic carbon (SOC) appear to be more controlled by soil features than by climate. Values of δ13C indicated the predominance of C3 plant, except in area with sugarcane cultivation (C4 plant). Changes in C distribution within the horizon suggest changes in degree of decomposability of soil organic matter (SOM), mainly in A1 and B1 layers, with A horizon richer in labile compounds. δ15N values indicated that N dynamics differ in the gradient. The thermal analyses showed that around 70 % or more of humin fraction is composed of structures more resistant to degradation, suggesting that C stock in Planosols has relative stabili... Mostrar Tudo |
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Palavras-Chave: |
Substâncias húmicas. |
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Thesagro: |
Biomassa; Matéria Orgânica; Solo. |
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Thesaurus Nal: |
Humic substances; Microbial biomass; Soil organic matter. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
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Embrapa Solos (CNPS) |
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