The association Drepanoclado uncinati-Heliospermetum pusilli (Arabidetalia caeruleae, Thlaspietea rotundifolii) in the Trnovski gozd plateau (Slovenia, NW Dinaric Alps)

• Main Authors: Surina, Boštjan, Vreš, Branko
• Format: Article in Journal/Newspaper
• Language: Slovenian
• Published: ZRC SAZU, Založba ZRC 2015
• Subjects: Dinaric Mts; Trnovski gozd; phytosociology; snow-bed vegetation; freezing ravine; Sanionia uncinata; Heliosperma pusillum; Drepanoclado uncinati-Heliospermetum pusilli; Salicion retusae; Thlaspietea rotundifolii; Dinaridi; fitocenologija; vegetacija snežnih dolinic; mrazišče; Poa alpina
• Online Access: https://ojs.zrc-sazu.si/hacquetia/article/view/2917/2668; https://ojs.zrc-sazu.si/hacquetia/article/view/2917

The phytosociology and ecology of Heliosperma pusillum in freezing ravines of the Trnovski gozd plateau (Slovenia, NW Dinaric Mts) are discussed. The species thrive on shadowy, moist, cold and stable screes of boulders with long-lasting snow cover. The stands belonged to the association Drepanoclado uncinati-Heliospermetum pusilli (Salicion retusae, Arabidetalia caeruleae, Thlaspietea rotundifolii). Due to close proximity to the Julian Alps, the stands host a significant number of SE – Alpine and N-Illyrian species. Therefore, a new geographical variant Paederota lutea is described. Differential species for the geographical variant are Phyteuma scheuchzeri ssp. columnae, Valeriana saxatilis, Rhodothamnus chamaecistus, and Saxifraga cuneifolia. For less stable screes with smaller rocky particles a new subassociation salicetosum retusae is described, and the differential species for the subassociation are Salix retusa and Poa alpina. Stands of the association Drepanoclado-Heliospermetum var. geogr. Paederota lutea from the Trnovski gozd plateau are on the north- westernmost part of the distribution area of the Dinaric alliance Salicion retusae. Preučili smo fitocenološke in okoljske razmere vrste Heliosperma pusillum v mraziščih v Trnovskem gozdu (Slovenija, SZ Dinaridi). Vrsta uspeva na senčnih, vlažnih in hladnih ustaljenih meliščih in skalnatih blokih z dolgotrajno snežno odejo. Sestoji, v katerih uspeva vrsta Heliosperma pusillum, pripadajo združbi Drepanoclado uncinati-Heliosperetum pusilli (Salicion retusae, Arabidetalia caeruleae, Thlaspietea rotundifolii). Zaradi bližine Julijskih Alp je v sestojih prisotnih precej jugovzhodno-alpskih in severno-ilirskih vrst. Zato smo opisali novo geografsko varianto in jo poimenovali po vrsti Paederota lutea var. geogr. nova. Razlikovalne vrste za geografsko varianto so Paederota lutea, Phyteuma scheuchzeri ssp. columnae, Rhodothamnus chamaecistus, Saxifraga cuneifolia, and Valeriana saxatilis. Na manj umirjenih meliščih z drobnejšim kamenjem smo opisali novo ...