During the first summer after plantation (2011) plants experienced
a great development. Since an irrigation system had been
installed in order to ensure the plants survival during the hardest
days of summer (from June to September), no drought problems
were observed. Due to the irrigation supply the emergence of
annual colonizing species that came from the close environment
was detected.
The growth of invasive plants was not considered negative for
the green roof effectiveness; on the contrary, they increase plant
coverage and therefore improve protection against solar radiation.
Otherwise, this could influence over the original species growth
since they compete for the same roof surface than Sedum and
Delosperma.
In winter, with the disappearance of the aerial part of these
plants, the vegetation coverage decreases exposing the substrate to
the environment and changing the thermal behaviour of green
roofs. The possibility of invasive plants appearance must be taken
into consideration during the irrigation design as well as during the
maintenance works.
In 2011, plants on the extensive green roof developed properly,
as shown in Fig. 13a. At this time, the plant coverage was approximately
20%.
During winter months, the aerial part of Sedum and Delosperma
was reduced. Hence, the coverage was lower during the heating
period. In addition, a similar effect is observed in the areas withgreat density of foreign plants, as these plants lose the aerial part
during those months (Fig. 13b).
In summer 2012, when data for this study was recorded, plant
coverage was approximately 85%, which can be considered high for
an extensive green roof under Mediterranean continental climate
(Fig. 13c). The greater development of Sedum and Delosperma prevented
the emergence of spontaneous plants during this summer.
During the first summer after plantation (2011) plants experienceda great development. Since an irrigation system had beeninstalled in order to ensure the plants survival during the hardestdays of summer (from June to September), no drought problemswere observed. Due to the irrigation supply the emergence ofannual colonizing species that came from the close environmentwas detected.The growth of invasive plants was not considered negative forthe green roof effectiveness; on the contrary, they increase plantcoverage and therefore improve protection against solar radiation.Otherwise, this could influence over the original species growthsince they compete for the same roof surface than Sedum andDelosperma.In winter, with the disappearance of the aerial part of theseplants, the vegetation coverage decreases exposing the substrate tothe environment and changing the thermal behaviour of greenroofs. The possibility of invasive plants appearance must be takeninto consideration during the irrigation design as well as during themaintenance works.In 2011, plants on the extensive green roof developed properly,as shown in Fig. 13a. At this time, the plant coverage was approximately20%.During winter months, the aerial part of Sedum and Delospermawas reduced. Hence, the coverage was lower during the heatingperiod. In addition, a similar effect is observed in the areas withgreat density of foreign plants, as these plants lose the aerial partduring those months (Fig. 13b).
In summer 2012, when data for this study was recorded, plant
coverage was approximately 85%, which can be considered high for
an extensive green roof under Mediterranean continental climate
(Fig. 13c). The greater development of Sedum and Delosperma prevented
the emergence of spontaneous plants during this summer.
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