Fróðskaparrit - 01.01.2007, Qupperneq 122

120
THE VEGETATION OF GRASS ROOFS IN THE FAROE ISLANDS AND
THE SURROUNDING GRASSLAND VEGETATION - A STUDY FROM SANDOY
DCA analysis of roof vegetation
1.1
AngeS
FragVesc*
ChilPolý 0.9
Festuca spp.
0.1
, PlagUndu
• LeonAutu
DactMacu. ifllJcnot
MniuHom ,
..RhytLoreVlolPalu
't'*PlaÆ3,hUn
PlanMed
• BracRuta
► TaraOffi
- Peltigeria spp.
» AnthOdor* HolcLana
Ce^%M . cardprat . ThuíTama . AgroTe™
PoteEreo* ** • AgroStdf 8 °
• SuccPrat ° © °
« • RanuAcri
o o o
o o
• EuryPrae o
• Trif Repe o . c
• HyloSple
o o
• PolyComm
• RumeAcet
’ PseuPuru .
^ • RhytSqua
StelMedi
oo O
o®
o® o o
» Cladonia spp.
• ThymDruc
IsotMyo^
Poaspp. ^
• RanuRepe
2.5 HypnCupfc
Axls 1 (s.d.) eigenvalue: 0.551
Figure 5. DCA scatterplot of roof samples and taxa. Key: samples - open circles; taxa - ftlled circles.
Abbreviations: AgroStolo, Agrostis stolonifera; Agro spp., Agrostis spp.; AgroTenu, Agrostis tenuis; Ange-
Sylv, Angelica sylvestris; AnthOdor, Anthoxanthum odoratum; BracRuta, Brachythecium rutabulum; Call-
Vulg, Calluna vulgaris; CardPrat, Cardamine pratensis; CarePani, Carex panicea; CeraFont, Cerastium
fontanum; ChilPoly, Chiloscyphus polyanthus; DactMacu, Dactylorhiza maculata; ErioAngu, Eriophorum
angustifolium; EuryPrae, Eurynchium praelongum; Fest spp., Festuca spp.; FragVesc, Fragaria vesca
(presumed to be planted); HolcLana, Holcus lanatus; HyloSple, Hylcomium splendens; HypnCupr, Hypnum
cupressiforme; IsotMyos, Isothecium myosuroides; LeonAutu, Leontodon autumnalis; LiguScot, Ligusticum
scoticum; LopheBide, Lophocolea bidentata; MniuHom, Mnium hornum; NardStri, Nardus stricta; Pelt. Sp.,
Peltigeria spp.; PlagthUn, Plagiothecium undulatum; PlagUndu, Plagiomnium undulatum; PolyJuni, Poly-
trichum juniperinum; PlanMari, Plantago maritima; PlanMajo, Plantago major; PoteErec, Potentilla erecta;
PolyComm, Polytricum commune; PrunVulg, Prunella vulgaris; PseuPuru, Pseudoscleropodium purum;
RanuAcri, Ranunculus acris; RanuRepe, R. repens; RhizPunc, Rhizomnium punctatum; RhytLore, Rhytidia-
delphus loreus; RhytSqua, R. squarrosus; RumeAcet, Rumex acetosa; StelMedi, Stellaria media; SuccPrat,
Succisa pratensis; TaraSp, Taraxacum spp.; ThuiTama, Thuidium tamariscinum; ThymPrae, Thymus
praecox; TrifRepe, Trifolium repens; ViolPalu, Viola palustris; ViolRivi, Viola riviniana.
or age) on the first axis. Scoring most high-
ly on the fírst axis are cryptogamic species
that become more prevalent as the turfs
age or deteriorate and the grasses and other
tall vascular taxa are lost from the roof.
The grasses (especially Poa and Festuca
spp.) appear with lower scores on axis 1,
where they occur with a wide range of tall
herbs that are able to compete with them.
An eigenvalue of 0.551 indicates that a