Data/hora: 02/06/2024 17:53:36

Biblioteca(s): 	Embrapa Florestas.	
Tipo da produção científica: 	Artigo em Periódico Indexado	
Circulação/Nível: 	A - 1	
Data corrente: 	24/10/2023	
Data da última atualização: 	24/10/2023	
Autoria: 	IBARR, M. A.; ZANATTA, J. A.; DIECKOW, J.; RIBEIRO, R. H.; SCHIRMANN, J.; RACHWAL, M. F. G.; STAHL, J.; SIMON, P. L.	
Afiliação: 	MARIANA ALVES IBARR, UNIVERSIDADE FEDERAL DO PARANÁ; JOSILEIA ACORDI ZANATTA, CNPF; JEFERSON DIECKOW, UNIVERSIDADE FEDERAL DO PARANÁ; RICARDO HENRIQUE RIBEIRO, UNIVERSIDADE FEDERAL DO PARANÁ; JANQUIELI SCHIRMANN, BOLSISTA DA EMBRAPA FLORESTAS; MARCOS FERNANDO GLUCK RACHWAL, CNPF; JAMES STAHL, KLABIN; PRISCILA LUZIA SIMON, AGRESEARCH INVERMAY.	
Título: 	Nitrous oxide and methane emissions from a Ferralsol as affected by loblolly pine cultivation time in subtropical Brazil.	
Ano de publicação: 	2023	
Fonte/Imprenta: 	Science of the Total Environment, v. 903, 166471, 2023.	
DOI: 	https://doi.org/10.1016/j.scitotenv.2023.166471	
Idioma: 	Português	
Conteúdo: 	Abstract. We hypothesized that the age of loblolly pine stands influences soil methane (CH4) and nitrous oxide (N2O) emissions. This is a relevant topic to be studied in subtropical Brazil, where the pine plantation area is increasing considerably. We evaluated N2O and CH4 emissions for two years in a Ferralsol under loblolly pine (Pinus taeda L.) stands of 1, 9 and 18 year-olds and a native forest (NF). We calculated the net CO2eq emission by considering the N2O and CH4 emissions from soil and the carbon (C) accumulation as litter in the forest floor. The soil N2O emission reduced gradually over the loblolly pine cultivation years, whereas CH4 uptake rates showed no clear pattern. Soil N2O emission showed a positive relationship with soil temperature in NF, and with soil ammonium and nitrate intensities in the pine stands. Soil CH4 uptake was inversely related to water-filled pore space in the pine stands, but this relationship was not observed in NF. The soil CH4 uptake rate was 4.6 times higher (p < 0.10) in NF than the average uptake in loblolly pine stands. On the other hand, soil N2O emissions in 9 and 18- year-old stands were similar (p > 0.10) to those in NF (1.3 kg N ha 1 yr 1). Our results suggest that cultivation with loblolly pine for 18 years can reduce soil N2O emission, and the uptake of CH4 in this system offsets 17 % of N2O emissions. Furthermore, the C accumulation as litter in the forest floor of the mature pine stands (9- and 18- year-old) generated a net emission of 1.6 Mg CO2eq ha 1 yr 1, showing to be an expressive offsetting mech- anism. Therefore, we conclude that aged loblolly forests can reach N2O emissions levels comparable to those of NF, and the C sequestration in these forests floor can significantly contribute to offset N2O emissions and act as sink for net atmospheric CO2eq.	
Palavras-Chave: 	Forest floor; Gases de efeito estufa; Pine; Sequestro de carbono; Stand age.	
Thesagro: 	Floresta; Pinus spp.	
Thesaurus Nal: 	Carbon sequestration; Forests; Greenhouse gases.	
Categoria do assunto: 	K Ciência Florestal e Produtos de Origem Vegetal	
Registro original: 	Embrapa Florestas (CNPF)	
Exemplares: 	CNPF - (58684-1) - UPC - AP - DD -  -  -  - DIS