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https://repositorio.inpa.gov.br/handle/1/17093
Título: | Responses of soil extracellular enzyme activities to experimental warming and CO2 enrichment at the alpine treeline |
Autor: | Souza, Rômulo C. Solly, Emily F. Dawes, Melissa Autumn Graf, Frank Hagedorn, Frank Egli, Simon Clement, Charles Roland Nagy, László Rixen, Christian Peter, Martina |
Palavras-chave: | Alpine Environment Carbon Dioxide Climate Change Coniferous Tree Enzyme Activity Fermentation Fine Root Global Change High Temperature Nutrient Cycling Treeline Warming Larix Decidua Pinus Uncinata |
Data do documento: | 2017 |
Revista: | Plant and Soil |
É parte de: | Volume 416, Número 1-2, Pags. 527-537 |
Abstract: | Background and aims: Climate warming and elevated CO2 can modify nutrient cycling mediated by enzymes in soils, especially in cold-limited ecosystems with a low availability of nutrients and a high temperature sensitivity of decomposition and mineralization. Methods: We estimated responses of soil extracellular enzyme activities (EEAs) to 6 years of soil warming and 9 years of CO2 enrichment at an Alpine treeline site. EEAs were measured in the litter (L), fermentation (F) and humified (H) horizons under Larix decidua and Pinus uncinata trees. Results: Soil warming indirectly affected EEAs through altered soil moisture, fine root biomass, and C:N ratio of the organic horizons. Warming increased β-glucosidase and β-xylosidase activities in the F horizon but led to reduced laccase activity in the L horizon, probably caused by drying of the litter horizon associated with the treatment. In the H horizon, previous CO2 enrichment altered the activity of leucine amino peptidase, N-acetylglucosaminidase, and phosphatase. No interactive effects between warming and CO2 enrichment were detected. Warming affected the temperature sensitivity of β-xylosidase but not of the other enzymes. Conclusions: Altered EEAs after six years of soil warming indicate a sustained stimulation of carbon, nitrogen and nutrient cycling under climatic warming at the alpine treeline. © 2017, Springer International Publishing Switzerland. |
DOI: | 10.1007/s11104-017-3235-8 |
Aparece nas coleções: | Artigos |
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