Litter stock and quality in Eucalyptus grandis in Northern Rio de Janeiro State, Brazil

Floresta e Ambiente

Endereço:
Rodovia BR 465, km 07, Campus da UFRRJ - IF-NIDFLOR - UFRRJ
Seropédica / RJ
23890-000
Site: http://www.floram.org
Telefone: (21) 2681-4986
ISSN: 2179-8087
Editor Chefe: João Vicente de Figueiredo Latorraca
Início Publicação: 31/12/1993
Periodicidade: Trimestral

Litter stock and quality in Eucalyptus grandis in Northern Rio de Janeiro State, Brazil

Ano: 2020 | Volume: 27 | Número: 3
Autores: Cunha, Gláucio de Mello; Costa, Gilmar Santos; Gama-Rodrigues, Antonio Carlos
Autor Correspondente: Gláucio de Mello Cunha | [email protected]

Palavras-chave: C:N ratio; eucalyptus; lignin; nutrient cycling

Resumos Cadastrados

Resumo Inglês:

Litter decomposition restores part of the elements absorbed by the plant back into the soil, acting as a regulator of the biogeochemical cycling of nutrients. This study aimed to evaluate the litter quantity and quality of Eucalyptus grandis in Northern Fluminense region, RJ. Three rotational sequences were studied, the first after 8 years (FR8), the second after 1.5 years (SR2), and a 5year old regrowth (R5). Leaf litter was divided into whole leaves (WL), fragmented pieces (FP), twigs/branches (TB), reproductive structures (RS) and bark (B). The total litter in FR8 was 9.56 Mg ha-1, in SR2, 13.85, and in R5, 22.97 Mg ha-1, corresponding to 83, 163 and 75 kg ha-1 of N, respectively. FP represented 38%, 48% and 55% of N, respectively, in SR2, R5 and FR8. The WL and FP fractions have high recycling potential of organic matter and nutrients due to their lower C/N and Lig/N quality index values.