Chemical and Spectroscopic Characteristics of Anthrosol (Amazonian Dark Earth) and Surrounding Soil from the Brazilian Amazon Forest: Evaluation of Mineral and Organic Matter Content by Depth

Author(s)

Bento, Lucas R. ^[1] ; Constantino, Isabela C. ^[1] ; Tadini, Amanda M. ^[2] ; Melo, Camila A. ^[1] ; Ferreira, Odair P. ^[3] ; Moreira, Altair B. ^[1] ; Bisinoti, Marcia C. ^[1]

Affiliation

^[1] Univ Estadual Paulista Julio de Mesquita Filho Un, Lab Estudos Ciencias Ambientais LECA, Inst Biociencias Letras & Ciencias Exatas, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil

^[2] Embrapa Instrumentacao, BR-13560970 Sao Carlos, SP - Brazil

^[3] Univ Fed Ceara, Lab Mat Funcionais Avancados LaMFA, Dept Fis, BR-60440554 Fortaleza, Ceara - Brazil

• Document type: Journal article
• Source: Journal of the Brazilian Chemical Society; v. 31, n. 8, p. 1623-1634, AUG 2020.
• Web of Science Citations: 1

Abstract

The chemical and spectroscopic characteristics of soil organic matter (SOM) isolated from Amazonian dark earth (ADE) and surrounding soil (SR) were evaluated according to the soil depth. The results showed opposite trends for the soils. While ADE featured SOM with a greater aromatic condensation degree and greater hydrophobicity in the top layer, the SR showed more aliphatic and polar SOM. The SOM arrangement from ADE was less hydrophobic, aromatic, and more polar in depth. In contrast, the SOM from SR showed an increase in molecular weight and hydrophobicity. Besides the aromatic protection in the SOM from ADE, there was organo-mineral protection through binding to soil minerals. This suggested that the SOM from ADE was protected by its hydrophobicity and interaction with minerals compared with that from the SR, thereby showing that the combination of both characteristics is important to create new technologies for soil carbon storage. (AU)

• FAPESP's process: 15/22954-1 - Metal transportation and natural organic matter characterization from rivers of Itacoatiara, Amazônia
• Grantee: Márcia Cristina Bisinoti
• Support type: Regular Research Grants
• FAPESP's process: 17/05575-2 - Structural similarity of the humic substances from hydrochar obtained from vinasse and sugarcane bagasse with the Black Earth (TPI)
• Grantee: Lucas Raimundo Bento
• Support type: Scholarships in Brazil - Master
• FAPESP's process: 18/15733-7 - Evaluation of the use of hydrochar for agricultural purposes and of magnetic coal as adsorbent material
• Grantee: Márcia Cristina Bisinoti
• Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants