Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/19112
Tipo: Artigo
Título: Soil organic carbon and nitrogen pools drive soil C-CO2 emissions from selected soils in Maritime Antarctica
Autor(es): Pires, C.V.
Schaefer, C.E.R.G.
Hashigushi, A.K.
Thomazini, A.
Mendonça, E.S.
F. Filho, E.I.
Abstract: The ongoing trend of increasing air temperatures will potentially affect soil organic matter (SOM) turnover and soil C-CO2 emissions in terrestrial ecosystems of Maritime Antarctica. The effects of SOM quality on this process remain little explored. We evaluated (i) the quantity and quality of soil organic matter and (ii) the potential of C release through CO2 emissions in lab conditions in different soil types from Maritime Antarctica. Soil samples (0–10 and 10–20 cm) were collected in Keller Peninsula and the vicinity of Arctowski station, to determine the quantity and quality of organic matter and the potential to emit CO2 under different temperature scenarios (2, 5, 8 and 11 °C) in lab. Soil organic matter mineralization is low, especially in soils with low organic C and N contents. Recalcitrant C form is predominant, especially in the passive pool, which is correlated with humic substances. Ornithogenic soils had greater C and N contents (reaching to 43.15 g kg^− 1 and 5.22 g kg^− 1 for total organic carbon and nitrogen, respectively). C and N were more present in the humic acid fraction. Lowest C mineralization was recorded from shallow soils on basaltic/andesites. C mineralization rates at 2 °C were significant lower than at higher temperatures. Ornithogenic soils presented the lowest values of C-CO2 mineralized by g of C. On the other hand, shallow soils on basaltic/andesites were the most sensitive sites to emit C-CO2 by g of C. With permafrost degradation, soils on basaltic/andesites and sulfates are expected to release more C-CO2 than ornithogenic soils. With greater clay contents, more protection was afforded to soil organic matter, with lower microbial activity and mineralization. The trend of soil temperature increases will favor C-CO2 emissions, especially in the reduced pool of C stored and protected on permafrost, or in occasional Histosols.
Palavras-chave: Climate warming
Organic matter
Carbon dioxide
Cold landscapes
Editor: Science of the Total Environment
Tipo de Acesso: Elsevier B.V
URI: https://doi.org/10.1016/j.scitotenv.2017.03.144
http://www.locus.ufv.br/handle/123456789/19112
Data do documento: 15-Out-2017
Aparece nas coleções:Solos - Artigos

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
artigo.pdf
  Until 2100-12-31
texto completo1,95 MBAdobe PDFVisualizar/Abrir ACESSO RESTRITO


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.