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Integrated studies on the interplay between soils,periglacial geomorphology and plant communities are crucial for theunderstanding of climate change effects on terrestrial ecosystems ofmaritime Antarctica, one of the most sensitive areas to global warming.Knowledge on physical environmental factors that influence plant communitiescan greatly benefit studies on the monitoring of climate change in maritimeAntarctica, where new ice-free areas are being constantly exposed, allowingplant growth and organic carbon inputs. The relationship between topography,plant communities and soils was investigated on Potter Peninsula, KingGeorge Island, maritime Antarctica. We mapped the occurrence anddistribution of plant communities and identified soil–landform–vegetationrelationships. The vegetation map was obtained by classification of aQuickBird image, coupled with detailed landform and characterization of 18soil profiles. The sub-formations were identified and classified, and wealso determined the total elemental composition of lichens, mosses andgrasses. Plant communities on Potter Peninsula occupy 23% of the ice-freearea, at different landscape positions, showing decreasing diversity andbiomass from the coastal zone to inland areas where sub-desert conditionsprevail. There is a clear dependency between landform and vegetated soils.Soils that have greater moisture or are poorly drained, and with acid to neutral pH, arefavourable for moss sub-formations. Saline, organic-matter-richornithogenic soils of former penguin rookeries have greater biomass anddiversity, with mixed associations of mosses and grasses, while stablefelsenmeers and flat rocky cryoplanation surfaces are the preferred sitesfor <i>Usnea</i> and <i>Himantormia lugubris</i> lichens at the highest surface. Lichens sub-formations cover thelargest vegetated area, showing varying associations with mosses

Soil–landform–plant-community relationships of a periglacial landscape on Potter Peninsula, maritime Antarctica