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Clay content drives carbon stocks in soils under a plantation of Eucalyptus saligna Labill. in southern Brazil

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Clay content drives carbon stocks in soils under a plantation of Eucalyptus saligna Labill. in southern Brazil

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Título Clay content drives carbon stocks in soils under a plantation of Eucalyptus saligna Labill. in southern Brazil
Autor Sausen, Tanise Luisa
Schaefer, Guilherme Frederico de Paula
Tomazi, Michely
Santos, Livia Scheunemann
Bayer, Cimelio
Rosa, Luis Mauro Gonçalves
Abstract Soil carbon accumulation is largely dependent on net primary productivity. To our knowledge, there have been no studies investigating the dynamics of carbon accumulation in weathered subtropical soils, especially in managed eucalyptus plantations. We quantified the seasonal input of leaf litter, the leaf decomposition rate and soil carbon stocks in an commercial plantation of Eucalyptus saligna Labill. in southern Brazil. Our goal was to evaluate, through multiple linear regression, the influence that certain chemical characteristics of litter, as well as chemical and physical characteristics of soil, have on carbon accumulation in soil organic matter fractions. Variables related to the chemical composition of litter were not associated with the soil carbon stock in the particulate and mineral fractions. However, certain soil characteristics were significantly associated with the carbon stock in both fractions. The concentrations of nutrients associated with plant growth and productivity, such as phosphorus, sulfur, copper and zinc, were associated with variations in the labile carbon pool (particulate fraction). Clay content was strongly associated with the carbon stock in the mineral fraction. The carbon accumulation and stabilization in weathered subtropical Ultisol seems to be mainly associated with the intrinsic characteristics of the soil, particularly clay content, rather than with the quantity, chemical composition or decomposition rate of the litter.
Contido em Acta botanica brasilica, São Paulo. vol. 28, n.2 (abr./jun. 2014), p. 266-273
Assunto Carbono
Decomposição
Eucalipto
Materia organica
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/118345
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