2.4. Plant cover and floristic composition
Considering the observed variability on plant cover during 2012,
the analysis of the floristic composition and the vegetation cover
evolution was conducted during a whole year, starting on May
2013. The main focus of this study was to study the seasonal and
spatial plant variability in the roof trying afterwards to link those
results with the obtained results for the thermal behaviour study
conducted during 2012.
To study the annual plant layer development, three square plots
of 1 m2 area were located in the same position of the sensors that
record thermal parameters (Fig. 3). From May 2013 to April 2014,
once a month, both floristic surveys and plant cover for each species
were carried out in each plot.