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Determining chemical composition of pyrogenic carbon in soil aggregates of Amazonian dark Earths

Grant number: 13/21325-5
Support type:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): January 10, 2014
Effective date (End): September 30, 2014
Field of knowledge:Agronomical Sciences - Agronomy - Soil Science
Principal researcher:Alvaro Pires da Silva
Grantee:Sâmala Glícia Carneiro Silva
Supervisor abroad: William Richard Horwath
Home Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
Research place: University of California, Davis (UC Davis), United States  
Associated to the scholarship:12/06542-7 - PHYSICAL-HYDRIC AND STRUCTURAL CHARACTERIZATION OF SOILS WITH ANTHROPIC HORIZONS IN CAXIUANÃ/PA, BP.DR

Abstract

Soil organic matter of Amazonian Dark Earths (ADEs) is largely comprised of carbon of pyrogenic origin (PyC). Although it is well known that PyC represents a key constituent of these soils, exerting many important functions that enhance nutrient availability and organic matter stability, it is still unclear how PyC influence soil physical properties. Moreover, both a generally accepted definition of PyC composition and standard analytical procedures for the integrated analysis of different chemical and physical ADE fractions are lacking. The aim of this study is to quantify the distribution of pyrogenic carbon in physically protected (occluded) aggregate soil fractions, characterize its chemical composition, determine its impacts on soil aggregation patterns, as well as analyze the stability of different organic carbon fractions in ADEs. Fractionation of water stable aggregates and density fractionation of soil will be performed in conjunction with BPCA method using high performance liquid chromatography (HPLC). The BPCA approach will be combined with d13C measurements, using high-performance liquid chromatography-isotope-ratio mass spectrometry (HPLC-IRMS). (AU)

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