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Fig. 11.4 Average air temperature, photosynthetic active radiation (PAR), cumulative precipita-
tion, NEE, GPP and TER in the Mezzolombardo site
Measured raw data were processed using the EdiRe software (R. Clement,
University of Edinburgh, UK) to obtain energy and mass fluxes. Flux computa-
tion was performed following standard procedures (Aubinet et al. 2000 ), with data
quality control according to Mauder and Foken ( 2011 ). Gaps in the dataset were
filled using Falge et al. ( 2001a , b ) and Reichstein et al. ( 2005 ) methodology.
The average air temperature value for 2009 was 13.5 °C, ranging from 4.5
(January 04) to 26.1 °C (August 18) (Fig. 11.4 ). Precipitation was mainly distrib-
uted during winter and autumn with a total amount of 737.7 mm. The 2009 was
characterized by high temperature and low precipitation, in particular during the
growing season, in comparison with the 30-years average.
The growing season starts in the middle of March and lasts until the end of
September with maximum carbon dioxide uptake at the end of April (because
of high radiation and water availability) and in July. In this period, the ecosys-
tem adsorbs more than 200 g C m 2 (Fig. 11.4 ). During the winter season (from
October to March the vineyard acted as a C source. The radiation, more than tem-
perature and precipitation, seems to be the main factor that drives carbon fluxes in
this vineyard ecosystem (Fig. 11.4 ). At an annual scale, the vineyard was a net C
sink, with cumulated NEE value of 145 g C m 2 y 1 (Fig. 11.5 ).
11.1.3 Serdiana (Cagliari) Site
The experimental site is located within the Company Argiolas Winery near
Serdiana, Cagliari, Italy (39°21′43″N, 9°07′26″E, 112 m asl) (Fig. 11.1 ). The
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