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Empirical estimations of CO2 flux component over different ecosystems

Bellucco, Veronica (2015) Empirical estimations of CO2 flux component over different ecosystems. Doctoral Thesis.

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Abstract

Vertical CO2 fluxes are the result of the net exchange between an ecosystem and the overlying atmosphere. The complex balance among biogenic and anthropogenic components varies from site to site and can be observed by using the micrometeorological Eddy Covariance (EC) technique. Different approaches can be used then to partition the EC flux measurements in order to understand the influence of each contribution to the flux.
The general aim of this PhD thesis is to relate carbon balance of different ecosystems to the main controlling factors and to look for general and empirical relations that allow to estimate CO2 flux components by using environmental variables and the percentage of vegetation cover.
The work is organized into three main parts: the first is about CO2 flux partitioning over three Mediterranean sites by using literature-based empirical relations and a new combined approach. The second part is about estimating anthropogenic components of the CO2 flux. A review of empirical methods is presented, as well as the recent improvements of the processbased model ACASA and its evaluation over a suburban site. Finally, the third part combines the results of previous chapters to present a new developed empirical simple model, based on land cover fraction and environmental variables. It can simulates the daily mean trend of CO2 flux over different ecosystems, and a first validation of the biogenic module, both over a natural and a suburban site, is presented.

Item Type:Doctoral Thesis
ID Code:10528
Contributors:Spano, Donatella and Marras, Serena
Publisher:Università degli studi di Sassari
Uncontrolled Keywords:Carbon flux modelling, Eddy Covariance, Urban Carbon Balance, CO2 flux partitioning, Net Ecosystem Exchange
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/03 Arboricoltura generale e coltivazioni arboree
Area 04 - Scienze della terra > GEO/12 Oceanografia e fisica dell'atmosfera
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Cicli, scuole e corsi:Ciclo 27 > Scienze e Biotecnologie dei sistemi agrari e forestali e delle produzioni alimentari > Agrometeorologia ed Ecofisologia dei sistemi agrari e forestali
Deposited On:17 Mar 2015 13:37

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