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Universidad de Alcalá (2015)

Establecimiento de un nivel de riego mínimo en verano para las cubiertas vegetales en ambientes mediterráneos continentales

Maldonado Campos, Javier

Titre : Establecimiento de un nivel de riego mínimo en verano para las cubiertas vegetales en ambientes mediterráneos continentales

Auteur : Maldonado Campos, Javier

Université de soutenance : Universidad de Alcalá

Grade : Máster Universitario en Restauración de Ecosistemas 2015

Résumé
Green roofs, the active establishment of vegetation on roofs, are becoming important tools to mitigate the large cities environmental problems. In Spain, green roofs have been little used in comparison with other non-Mediterranean countries. There are still important gaps regarding the knowledge about the maintenance management of green roofs in semiarid environments at reasonable costs. Moreover, studies are needed about the species that can grow with little maintenance on these systems. The aim of this study is to establish a minimum irrigation schedule during the summer, in the water stress season, to maintain the functionality of green roofs under continental Mediterranean conditions, minimizing irrigation costs. In addition, the feasibility of four perennials species has been compared for Mediterranean semi-intensive green roofs. To achieve this objective, we performed a study for two summer months in 2015, in which three irrigation regimes have been established : 2, 4 and 8 L m-2 week-1). Studied species were Lavandula latifolia, Lygeum spartum, Vella pseudocytisus and Salvia lavandulifolia. Periodically, we measured the soil moisture and the plants physiological status using chlorophyll fluorescence measurements. At the end of the study, survival and growth was measured. Moisture decreased more in the plots with the lowest irrigation, which plants showed the highest photoinhibition and, consequently the lowest survival. Species differed in survival which depended on irrigation level and the position within the green roof. Overall, L. spartum had the highest survival, while S. lavandulifolia had the lowest survival but the highest growth of all species. Plant survival and growth were higher in the lower positions of the green roofs than in upper sides. This pattern was related to differences in soil moisture in both parts of the green roof. Therefore we conclude that the most appropriate irrigation for an optimal survival and for plants to develope a good physiological condition must be over 8 L m-2 week-1.

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