Plant community composition in the ITEX plots at Barrow and Atqasuk, 2014, 2017

• Main Author: Robert Hollister
• Format: Dataset
• Language: unknown
• Published: Arctic Data Center 2018
• Subjects: pointframe; Arctic Plants; Alectoria nigricans; Alectoria ochroleuca; Cornicularia divergens; Alopecurus alpinus; Aneura pinguis; Riccia lobate; Antennaria friesiana; Arctagrostis latifolia; Artemisia borealis; Aulacomnium palustre; Aulacomnium turgidum; Bartramia ithyphylla; Betula nana; Brachythecium turgidum; Bryum capillare; Bryum cyclophyllum; Bryum pseudoargenteum; Bryum subneodamense; Bryum teres; Cinclidium latifolium; Cinclidium subrotundum; Plagiomnium ellipticum; Pohlia cruda; Pohlia nutans; Rhizomnium andrewsianum; Bryoerythrophyllum recurvirostre; Calliergon giganteum; Calliergon richardsonii; Calliergon sarmentosum; Orthothecium chryseon; Campylium stellatum; Carex aquatilis; Carex rariflora; Carex rotundata; Carex stans; Carex subspathacea; Carex bigelowii; Cardamine pratensis; Cassiope tetragona; Cerastium beeringianum; Asahinea chrysantha; Cetraria cucullata; Cetraria nivalis; Cetraria delisei; Cetraria ericetorum; Cetraria islandica; Cetraria laevigata; Cetraria richardsonii; Chrysosplenium tetrandrum; Cladina mitis; Cladonia amaurocraea; Cladonia coccifera; Cladonia cornuta; Cladonia crustose; Cladonia gracilis; Cladonia pyxidata; Cladonia squamosa; Cladonia uncialis; Cladina rangiferina; Cochlearia officinalis; Conostomum tetragonum; Dactylina arctica; Dicranum acutifolium; Dicranum angustum; Dicranum elongatum; Dicranum spadiceum; Distichium capillaceum; Distichium inclinatum; Distichium flexicaule; Draba lactea; Draba micropetala; Calliergon black; Drepanocladus badius; Drepanocladus brevifolius; Drepanocladus exannulata; Drepanocladus fluitans; Drepanocladus revolvens; Drepanocladus uncinatus; Dupontia fisheri; Dupontia psilosantha; Eriophorum angustifolium; Eriophorum triste; Eriophorum russeolum; Eriophorum scheuchzeri; Hierochloe alpina; Hylocomium splendens; Juncus biglumis; Anastrophyllum minutum; Anastrophyllum saxicola; Blepharostoma trichophyllum; Cephaloziella arctica; Chyloscyphus fragilis; Gymnocolea inflata; Leicolea rutheana; Orthocaulis kunceanus; Orthocaulis quadrilobus; Sphenolobus minutus; Tritomaria quinquedentata; Ledum palustre; Luzula arctica; Luzula confusa; Luzula wahlenbergii; Meesia triquetra; Meesia uliginosa; Minuartia obtusiloba; Oncophorus virens; Oncophorus wahlenbergii; Oxyria digyna; Papaver hultenii; Papaver lapponicum; Hypogymnia rugosa; Hypogymnia subobscura; Parmelia omphalodes; Pedicularis kanei; Pedicularis sudetica; Lobaria linita; Nephroma expallidum; Peltigera aphthosa; Peltigera canina; Peltigera leucophlebia; Peltigera malacea; Peltigera rufescens; Solorina crocea; Sticta arctica; Petasites frigidus; Calamagrostis holmii; Festuca brachyphylla; Hierochloe pauciflora; Poa arctica; Poa viviparum; Pogonatum dentatum; Polygonum bistorta; Polytrichum alpinum; Polytrichum hyperboreum; Polytrichum jenseii; Polytrichum juniperum; Polytrichum piliferum; Polytrichum strictum; Timmia austriaca; Polygonum viviparum; Potentilla hyparctica; Psoroma hypnorum; Ptilidium ciliare; Racomitrium canescens; Racomitrium lanuginosum; Ranunculus nivalis; Rhytidium rugosum; Salix phlebophylla; Salix polaris; Salix pulchra; Salix rotundifolia; Saxifraga cernua; Saxifraga foliolosa; Saxifraga hieracifolia; Saxifraga hirculus; Saxifraga punctata; Scapania paludicolla; Senecio atropurpureus; Siphula ceratites; Sphaerophorus globosus; Sphagnum compactum; Sphagnum imbricatum; Sphagnum warnstorfii; Stellaria humifusa; Stellaria laeta; Stereocaulon alpinum; Thamnolia subuliformis; Tomenthypnum nitens; Tortella torulosa; Trisetum spicatum; Vaccinium vitis-idaea; Empetrum nigrum; Eriophorum vaginatum; Gymnomitrion coralliodes; Melandrium apetalum; Pedicularis lapponica; Petasites hyperboreus; Ranunculus pygmaeus; Ranunculus pallasii; Saxifraga caespitosa; Saxifraga flagellaris; Parmelia skultii; Alectoria; Arctic; Rugosa; Eriophorum
• Online Access: https://search.dataone.org/view/urn:uuid:fac6dc92-3397-403c-be5e-0a911399799d

The data presented were collected on the second summer of the experiment, in 2000, during summers of 2007 or 2008, 2012, and 2017 for 48 plots (24 experiment open-top chamber plots and 24 control plots) at four sites (Atqasuk Wet Meadow, Atqasuk Dry Heath, Barrow Wet Meadow, and Barrow Dry Heath) and 2014 for 8 plots (4 control and 4 experimental) at two sites (Barrow Dry Heath and Atqasuk Dry Heath). The data were gathered by placing a Point Frame over each plot and recording the top and bottom species at each location in years prior to 2007 and every contact after then. The height of the top species was recorded relative to the ground at that location. The grids were spaced 7 cm apart and started at 3.5 cm from the edge of the square 70 cm frame. The species was recorded at each location along with its height relative to the ground surface. Occasionally it was difficult to distinguish which species was on the ground because there were several intertwined individuals, therefore preference was given to vascular plants, then lichens, and then mosses. Due to the limitations of field identification many species were lumped into larger taxa. The taxa provide are relatively robust, however even with the species lumping presented there may have been some difficulty with bryophytes and lichens. Prior to 2007 the sampling only involved the top and bottom hits. In 2007 or 2008, 2012, and 2017 all hits were recorded. The height of each hit was estimated for the first sampling (1995-1997). In 2014 only 8 plots from each dry site were sampled as soil samples were taken from these plots.