http://www.cnr.it/ontology/cnr/individuo/prodotto/ID103632

Seasonal and interannual variations in carbon dioxide exchange of a Mediterranean maquis ecosystem (Abstract in rivista)

Type

Abstract in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Seasonal and interannual variations in carbon dioxide exchange of a Mediterranean maquis ecosystem (Abstract in rivista) (literal)

Anno

2008-01-01T00:00:00+01:00 (literal)

Alternative label

Marras S, Sirca C, Spano D, Duce P, Zara P, Arca A, Ventura A (2008)
Seasonal and interannual variations in carbon dioxide exchange of a Mediterranean maquis ecosystem
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Marras S, Sirca C, Spano D, Duce P, Zara P, Arca A, Ventura A (literal)

Pagina inizio

10491 (literal)

Pagina fine

10491 (literal)

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http://www.geophysical-research-abstracts.net/ (literal)

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10 (literal)

Rivista

Geophysical research abstracts (Rivista)

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1 (literal)

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Shrubland ecosystems are rarely investigated on the energy and carbon exchange. Mediterranean maquis is a typical shrubland ecosystem of the Mediterranean Basin, but it is also spread in several regions of the world with similar climate conditions (i.e., summer drought and mild winter temperature). In this study, maquis ecosystem was investigated to improve the knowledge about CO2 fluxes and the relationship between NEE and environmental variables. Micrometeorological data were collected near the northwest coast of Sardinia, Italy, over the period 2004-2007. An open-path eddy covariance system was installed over the vegetation at about 2.0 m height. Fluxes and meteorological data were quality-controlled, and gaps in the data were filled. A LI-2000 leaf area instrument was used to estimate the LAI. Maquis ecosystem was generally a sink of carbon, showing a CO2 highest uptake in the spring and fall and a lowest uptake during the summer drought period. Net ecosystem exchange (NEE) was relatively low compared to other forest ecosystems, and climate conditions affected NEE values during the years. In particular, the drought and air temperature were the mainly affecting factors. A good relationship was found between Gross Primary 1Production and latent heat fluxes (LE). Also air temperature had a role in carbon production. Similar relationships were found between ecosystem respiration (Reco) and LE and between Reco and air temperature. (literal)

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Dipartimento di Economia e Sistemi Arborei, Università di Sassari; Istituto di Biometeorologia, Consiglio Nazionale delle Ricerche (literal)

Titolo

Seasonal and interannual variations in carbon dioxide exchange of a Mediterranean maquis ecosystem (literal)

Abstract

Shrubland ecosystems are rarely investigated on the energy and carbon exchange. Mediterranean maquis is a typical shrubland ecosystem of the Mediterranean Basin, but it is also spread in several regions of the world with similar climate conditions (i.e., summer drought and mild winter temperature). In this study, maquis ecosystem was investigated to improve the knowledge about CO2 fluxes and the relationship between NEE and environmental variables. Micrometeorological data were collected near the northwest coast of Sardinia, Italy, over the period 2004-2007. The climate is characterized by wet and cool winters and hot summers, with a severe water deficit from May through September. An open-path eddy covariance system was installed over the vegetation at about 2.0 m height. Fluxes and meteorological data were qualitycontrolled, and gaps in the data were filled. An LI-2000 leaf area instrument was used to estimate the LAI. The estimation of physiological processes and biomass factors affecting water exchange was made calculating the decoupling coefficient (omega) according to Jarvis and McNaughton (1986). Higher values were recorded during winter and spring, and lower values were recorded during summer (average value of 0.2 in the entire period). The ratio (H+LE)/(Rn-G) was approximately equal to 0.92; indicating good energy balance closure. The Bowen ratio values were high in the winter and clearly decreased during the summer drought season. Maquis ecosystem was generally a sink of carbon, showing a CO2 highest uptake in the spring and fall and a lowest uptake during the summer drought period. NEE was relatively low compared to other forest ecosystems, and climate conditions affected NEE values during the years. In particular, the drought and air temperature were the mainly affecting factors. A good relationship was found between GPP and LE. Also air temperature had a role in carbon production. Similar relationships were found between Reco and LE and between Reco and air temperature. (literal)

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