Data/hora: 21/09/2024 23:49:22

Biblioteca(s): 	Embrapa Florestas.	
Data corrente: 	14/11/2019	
Data da última atualização: 	14/11/2019	
Autoria: 	VELOSO, M. G.; DIECKOW, J.; ZANATTA, J. A.; PERGHER, M.; BAYER, C.; HIGA, R. C. V.	
Afiliação: 	Murilo G. Veloso, UFPR; Jeferson Dieckow, UFPR; JOSILEIA ACORDI ZANATTA, CNPF; Maico Pergher, UFPR; Cimélio Bayer, UFRGS; Rosana Clara Victoria Higa, Pesquisadora aposentada da Embrapa Florestas.	
Título: 	Long-term loblolly pine land use reduces methane and net greenhouse gas emissions in a subtropical Cambisol, despite increasing nitrous oxide.	
Ano de publicação: 	2019	
Fonte/Imprenta: 	Annals of Forest Science, v. 7, n. 3, article 86, Sept. 2019.	
DOI: 	10.1007/s13595-019-0871-6	
Idioma: 	Inglês	
Conteúdo: 	& Key message In loblolly pine land use of 17?32 years following forest clearing, CH4 consumption and N2O emission diminished by 17 years, due to high soilmoisture (~ 80%WFPS, N2O intoN2), but increased by 32 years, where medium moisture favoured methanotrophy and denitrification into N2O. Soil greenhouse gases (GHG) emission was positive by 17 years, but negative by 32, when soil sequestered carbon. & Context Much of the role of planted forests in the gaseous soil-atmosphere exchanges in the subtropics remains to be evaluated. & Aims To assess the impacts of loblolly pine (Pinus taeda L.) on soil nitrous oxide (N2O) and methane (CH4) fluxes in a subtropical Cambisol. & Methods Fluxes were monitored over 1 year with static chambers, in forest stands under natural forest (NF) and pine plantation for 17 (P17) and 32 years (P32). & Results The NF soil showed the lowestN2O emission and the highest CH4 consumption, because of the lowest water-filled pore space (WFPS, < 40%) and highest soil macroporosity. In P17, N2O emission was still low, but CH4 consumption diminished sixfold, possibly because of the predominance of methanotrophy, favoured by the highest WFPS (~ 80%) and lowest macroporosity that together with low mineral N concentration also did not favour the formation of N2O. In P32, the improved soil mineral N, macroporosity and intermediate WFPS (~ 60%) increased CH4 consumption and also N2O emission, in an environment supposedly favourable to methanotrophy and also to N2O production. Considering soil organic carbon (SOC) from a concurrent study, the net GHG emission (Mg Ceq ha?1 year?1) was 2.8 in P17 and ?1.1 in P32.	
Palavras-Chave: 	Ammonium; GHGintensity; Nitrate; Southern Brazil.	
Thesagro: 	Nitrato; Reflorestamento; Temperatura.	
Thesaurus Nal: 	Reforestation; Temperature.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Florestas (CNPF)	
Exemplares: 	CNPF - (57088-1) - UPC - AP - DD -  -  -  - DIS