Physical and chemical properties of Coarse Woody Debris submitted to the natural process of decomposition in a Secondary Atlantic Forest Fragment in Brazil.

Autor: Villanova PH; Departamento de Engenharia Florestal, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil. paulo.villanova@ufv.br., Torres CMME; Departamento de Engenharia Florestal, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil., Jacovine LAG; Departamento de Engenharia Florestal, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil., de Cássia Oliveira Carneiro A; Departamento de Engenharia Florestal, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil., Ballotin FC; Departamento de Solos, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil., Schettini BLS; Departamento de Engenharia Florestal, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil., da Rocha SJSS; Departamento de Engenharia Florestal, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil., Rufino MPMX; Departamento de Engenharia Florestal, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil., de Freitas MF; Departamento de Engenharia Florestal, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil., Castro RVO; Departamento de Engenharia Florestal, Universidade Federal de São João del-Rei, Sete Lagoas, Minas Gerais, Brazil.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2023 May 05; Vol. 13 (1), pp. 7377. Date of Electronic Publication: 2023 May 05.
DOI: 10.1038/s41598-023-34526-9
Abstrakt: Coarse Woody Debris (CWDs) are constantly exposed to the natural decomposition process of wood, which can lead to a change in its physical-chemical properties. However, these changes have not yet been fully elucidated, requiring further studies to help to understand the effect of this process on CWDs degradation. Thus, the objectives of this study were: (i) verify if the decomposition affects the physical-chemical properties of the CWDs; (ii) verify if the structural chemical composition of the CWDs is altered as a function of decomposition, using immediate chemical and thermogravimetric analysis. Wood samples were collected from the CWDs to carry out these analyses, considering pieces with diameters ≥ 5 cm separated into 4 decay classes. The results indicated that the average apparent density decreased as a function of the increase of CWDs decomposition (0.62-0.37 g cm -3 ). The averages contents of Carbon and Nitrogen suffered less impact with the increase of CWDs decompositions, ranging from 49.66 to 48.80% and 0.52 to 0.58%, respectively. Immediate chemical and thermogravimetric analysis indicated a loss of holocelluloses and extractives and an increase in the concentration of lignin and ash throughout the decomposition process. The weight loss analyzed by thermogravimetric analysis was greater for less decomposed CWDs and with larger diameters. The use of these analyzes removes the subjectivity of CWDs decay classes, reducing the number of tests to determine CWDs physical-chemical properties and increasing the studies accuracy focused on the carbon cycle of these materials.
(© 2023. The Author(s).)
Databáze: MEDLINE
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