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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10990/232

Autori: De Simon, Giuseppe
Supervisore non afferente all'Università: ZERBI, GIUSEPPE
Titolo: Carbon dynamics in forests and croplands: influence of management and climate extremes
Abstract (in inglese): Management and climate change had and continue to have a strong impact on carbon (C) dynamics in terrestrial ecosystems. In this context, the possible effects due to changes in climate extreme frequency are far to be fully understood as well as mitigation strategies related to forest and agricultural management are still strongly debated. The main objective of this thesis is to bring some additional knowledge on the above mentioned topics through manipulation experiments, medium-term micrometeorological observations and long-term field measurements (chronosequences) in forests and croplands. In particular, after an introduction to the main topic of research (Chapter 1) and a brief summary of the adopted methods (Chapter 2), the thesis is divided into three research papers (one already published, one submitted and one in preparation): - the first paper (Chapter 3) examines, through two forest chronosequences and model simulations, the C pools dynamics in a beech and a spruce forest in Italian Alps. The main objective of the work was to determine the influence of stand age and applied management on the C cycle in these forests. Results showed that shelterwood management had no influence on soil C stock, while model simulations confirmed that the applied management allows a rapid recovery of the ecosystem after disturbance (i.e. final cut); - the second paper (Chapter 4) investigates the effects of conservation agriculture (i.e. minimum tillage + cover crops) on ecosystem C dynamics and crop productivity in a 5-year crop rotation. Continuous micrometeorological measurements on paired plots were used to quantify all C fluxes of the ecosystem. Minimum tillage resulted in a higher net ecosystem productivity than control (conventional tillage), but in a decrease of the overall C budget (net ecosystem C budget, NECB); - the third paper (Chapter 5) focuses on temperature extreme event (i.e. cold and hot waves) impacts on heterotrophic respiration, yield and C budget in a soybean crop. Results showed that both extreme events did not alter the C budget even though an acceleration in decomposition was found in warm treatment.
Parole chiave: Shelterwood system; Carbon dynamics; Soil carbon; Beech; Spruce; Conservation agriculture; Net ecosystem carbon balance; Crop rotation; Crop yield; Soil respiration; Eddy covariance; Climate change; Ecosystem manipulation; Extreme events; Soil warming; Heat waves
MIUR : Settore AGR/05 - Assestamento Forestale E Selvicoltura
Lingua: eng
Data: 10-apr-2013
Corso di dottorato: Dottorato di ricerca in Economia, ecologia e tutela dei sistemi agricoli e paesistico ambientali
Ciclo di dottorato: 25
Università di conseguimento titolo: Università degli Studi di Udine
Luogo di discussione: Udine
Altre informazioni: Co-supervisore: Giorgio Alberti
Citazione: De Simon, G. Carbon dynamics in forests and croplands: influence of management and climate extremes. (Doctoral Thesis, Università degli Studi di Udine, 2013).
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