DUGi

Aproximació a la flora i a les comunitats vegetals de Romanyà de la Selva

http://dugi.udg.edu/item/http:@@@@hdl.handle.net@@10256@@28564

To carry out the research, several field trips were made between winter and spring to identify and photograph the species. The identifications were validated with citizen science tools such as PlantNet and were compared with the biodiversity data bank of Catalonia and specialized bibliography. The life form, relative abundance, habitat, distribution and phytosociological ascription of each species were recorded. In parallel, vegetation inventories were carried out according to the Sigmatist method, listing all its species and granting them the abundance-dominance index established by Braun-Blanquet and, at the same time, noting environmental and structural variables such as coverage, vegetation height, soil type, slope and orientation. The data collected were computerized and analyzed with the Quercus and Ginkgo programs. The obtained rectangular matrices were applied the K-means statistics -to divide the matrix into groups-, Silhouette -to decide the optimal number of groups- and PCoA -to graphically represent the obtained groups-. The results obtained allowed to clearly differentiate the coastal holm oak forest (Viburno tini-Quercetum ilicis), the mountain holm oak forest (Asplenio onopteridis-Quercetum ilicis), various types of Mediterranean scrub and meadows, each with its respective faithful and differential species. The predominance at the level of coverage of phanerophytes such as the holm oak (Quercus ilex), a key species for the forest structure, was confirmed, as well as the predominance at the specific level of therophytes adapted to acidic soils and summer drought conditions typical of the Mediterranean climate. At higher altitudes, the presence of Eurosiberian species was detected, indicating a cooler and wetter microclimate within the massif. This work expands the floristic database and provides relevant information for the conservation and sustainable management of the territory, especially in the fight against invasive species and in the custody of unique habitats. It reinforces the importance of conserving plant heritage and allows raising awareness in society about the biodiversity of Mediterranean forests. In addition, it highlights the combination of classical techniques with modern statistical tools, guaranteeing reliable and transferable results

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