Alvar

Locais europeus de Alvar

SwedenÖland – Stora Alvaret – largest alvar extent in EuropeGotlandVästergötland – several locations on limestone mountain Kinnekulle, smaller fragments on Falbygden, e.g. in Dala and Högstena parishesEstoniaAlvars are distributed along the whole northern coast of Estonia from approx. the town of Paldiski to Sillamäe, wherever limestone comes to the surface near the seashore (see Baltic Klint), as well as on the islands of the West Estonian archipelago. Estonia used to be home to approximately one third of the world's alvars; however, the total area of alvars has decreased from 43,000 hectares in the 1930s to 12,000 hectares in 2000, and approximately 9,000 hectares in 2010. Estonian alvars are home to 267 species of vascular plants, approximately one fifth of which are protected. There are also 142 species of bryophytes and 263 species of lichens. The Estonian government has committed itself to protect at least 9,800 hectares of the country's alvars as part of the Natura 2000 network. The Loopealse subdistrict of Tallinn is named after alvar.Vardi Nature Reserve in Rapla County is an Estonian nature reserve especially designated to protect one of the more representative alvar areas of Estonia.EnglandCumbria and North Yorkshire – under protection in the UK Biodiversity Action PlanIrelandThe Burren, a large alvar in northwest County Clare

Alguns locais norte -americanos de Alvar

The rare Charitable Research Reserve – Cambridge, OntarioLake ErieKelley's Island, Ohio – North Shore Alvar State Nature PreserveMarblehead, Ohio – mostly destroyed by limestone quarryingPelee Island, Ontario – Stone Road Alvar Nature ReserveLake HuronMaxton Plains Proposed Natural Area, Drummond Island, MichiganBelanger Bay Alvar, Manitoulin Island, OntarioQuarry Bay Nature Reserve, Manitoulin Island, OntarioBruce Alvar Nature Reserve, Bruce Peninsula, OntarioBaptise Harbour Nature Reserve, Bruce Peninsula, OntarioMisery Bay Provincial Park, Manitoulin Island, OntarioLake MichiganRed Banks Alvar, Red Banks, Brown County, WisconsinLake OntarioCarden Plain Alvar, City of Kawartha Lakes, Ontario, including Carden Alvar Provincial ParkChaumont Barrens Preserve, New YorkThree Mile Creek Barrens, New YorkBurnt Lands Alvar, Almonte, OntarioBalsam Lake Indian Point Provincial Park, OntarioQuebecQuyonAlvar d'AylmerManitobaInterlake

Veja também

Calcareous grassland – An ecosystem associated with thin basic soilChalk heathEdaphicGypcrust – Hardened layer of soil with a high percentage of gypsumGypsum flora of Nova Scotia – Group of plants in Nova Scotia, CanadaRendzina – Humus-rich shallow soil typeBarren vegetation – Area of land where plant growth may be limited