Floristic Composition and Structure of Fen Communities in Northwest Iowa van der Valk, Arnold van der Valk, A. G.
dc.contributor.department Botany 2018-09-28T15:03:21.000 2020-06-30T00:54:42Z 2020-06-30T00:54:42Z Wed Jan 01 00:00:00 UTC 1975 1975-07-01
dc.description.abstract <p>Iowa fens have three distinct, concentric vegetation zones: a border zone, a sedge mat zone, and a discharge zone where ground water supplying the fens comes to the surface. Calamagrostis inexpansa Gray, Viola nephrophylla Greene, Scirpus americanus Pers. and Carex spp. are the dominants in the border zone. The composition of this zone is quite variable both within and between fens. The sedge mat is composed primarily of Rhynchospora capillacea Torr. Other species normally found in this zone are Lobelia kalmii L., Muhlenbergia racemosa ( Michx.) BSP, Parnassia glauca Raf.,Triglochin maritima L. and Scirpus americanus. Although all of the species in this zone are also found in the other zones, this zone is readily distinguishable because of the low stature of the vegetation. The discharge zone is dominated usually by Carex spp. or Calamagrostis inexpansa, except at one fen where Phragmites communis Trin. and Helianthus grosseserratus Martens are the dominants. The sedge mat zone on the average has fewer species per quadrat ( 5.8 versus 6.0 and 8.6), lower Shannon-Weaver index ( 0.8 versus 1.15 and 1.40) and higher Simpson's index ( 0.58 versus 0.42 and 0.32) than the discharge and border zones, respectively.</p>
dc.description.comments <p>This article is published as van der Valk, A. G. 1975. Floristic composition and structure of fen communities in northwest Iowa. <em>Proceedings of the Iowa Academy of Science</em> 82:113-118. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 1093
dc.identifier.contextkey 12907518
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath bot_pubs/94
dc.language.iso en
dc.subject.disciplines Botany
dc.subject.disciplines Ecology and Evolutionary Biology
dc.subject.disciplines Hydrology
dc.subject.disciplines Soil Science
dc.subject.keywords Fen
dc.subject.keywords Floristic Composition
dc.subject.keywords Shannon-Weaver Index
dc.subject.keywords Simpson's Index
dc.subject.keywords Vegetation
dc.subject.keywords Zonation
dc.title Floristic Composition and Structure of Fen Communities in Northwest Iowa
dc.type article
dc.type.genre article
dspace.entity.type Publication
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