We present the first results of the analysis of human impact on the Juniperus macrocarpa Sm. populations in four Sites of Community Importance (SCI) in Sardinia. The choice of areas was made in consideration of the human disturbance: two sites are subjects by a heavy sea tourism while others have dune systems among the best preserved of Sardinia. The main objective of the comparison between areas with different degrees of disturbance has been to understand whether the anthropic pressure, mainly due to tourism resort, has a significant effect on J. macrocarpa. For this purpose in each SCI were placed three plots of 15 x 5 m, inside were performed periodic monitoring on J. macrocarpa plants. The results of monitoring in the 12 plots, for the period 2009-11, showed a significantly higher total number of seedlings in spring than in autumn, as well as significant differences among the localities and years. These data confirmed that the summer season represents the most critical for the survival of seedlings. The analyzes conducted confirming the heavy human impact in the Domus de Maria and Villasimius localities, but this phenomenon has only a marginal impact on the life cycle of J. macrocarpa, according to preliminary results.
Analisi dell’impatto antropico sulle formazioni a Juniperus macrocarpa della Sardegna meridionale
PINNA, MARIA SILVIA;BACCHETTA, GIANLUIGI
2012-01-01
Abstract
We present the first results of the analysis of human impact on the Juniperus macrocarpa Sm. populations in four Sites of Community Importance (SCI) in Sardinia. The choice of areas was made in consideration of the human disturbance: two sites are subjects by a heavy sea tourism while others have dune systems among the best preserved of Sardinia. The main objective of the comparison between areas with different degrees of disturbance has been to understand whether the anthropic pressure, mainly due to tourism resort, has a significant effect on J. macrocarpa. For this purpose in each SCI were placed three plots of 15 x 5 m, inside were performed periodic monitoring on J. macrocarpa plants. The results of monitoring in the 12 plots, for the period 2009-11, showed a significantly higher total number of seedlings in spring than in autumn, as well as significant differences among the localities and years. These data confirmed that the summer season represents the most critical for the survival of seedlings. The analyzes conducted confirming the heavy human impact in the Domus de Maria and Villasimius localities, but this phenomenon has only a marginal impact on the life cycle of J. macrocarpa, according to preliminary results.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
