Data/hora: 03/06/2024 18:30:58

Provedor de dados: | 90
País: | Brazil
Título: | Particulate soil organic carbon and stratification ratio increases in response to crop residue decomposition under no-till
Autores: | Briedis,Clever; Sá,João Carlos de Moraes; De-Carli,Roberto Simão; Antunes,Erielton Aparecido Pupo; Simon,Lucas; Romko,Marielle Leticia; Elias,Lucio Schenekenberg; Ferreira,Ademir de Oliveira.
Data: | 2012-11-01
Ano: | 2012
Palavras-chave: | Black oat; Carbon sequestration; Dry matter decomposition; Half-life.
Resumo: | In soils under no-tillage (NT), the continuous crop residue input to the surface layer leads to carbon (C) accumulation. This study evaluated a soil under NT in Ponta Grossa (State of Paraná, Brazil) for: 1) the decomposition of black oat (Avena strigosa Schreb.) residues, 2) relation of the biomass decomposition effect with the soil organic carbon (SOC) content, the particulate organic carbon (POC) content, and the soil carbon stratification ratio (SR) of an Inceptisol. The assessments were based on seven samplings (t0 to t6) in a period of 160 days of three transects with six sampling points each. The oat dry biomass was 5.02 Mg ha-1 at t0, however, after 160 days, only 17.8 % of the initial dry biomass was left on the soil surface. The SOC in the 0-5 cm layer varied from 27.56 (t0) to 30.07 g dm-3 (t6). The SR increased from 1.33 to 1.43 in 160 days. There was also an increase in the POC pool in this period, from 8.1 to 10.7 Mg ha-1. The increase in SOC in the 0-5 cm layer in the 160 days was mainly due to the increase of POC derived from oat residue decomposition. The linear relationship between SOC and POC showed that 21 % of SOC was due to the more labile fraction. The results indicated that the continuous input of residues could be intensified to increase the C pool and sequestration in soils under NT.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000500012
Editor: | Sociedade Brasileira de Ciência do Solo
Relação: | 10.1590/S0100-06832012000500012
Formato: | text/html
Fonte: | Revista Brasileira de Ciência do Solo  v.36 n.5 2012
Fonte: | info:eu-repo/semantics/openAccess