Plant associations within the interior valleys of the Umpqua River Basin, Oregon.

作者: Winston Paul Smith

DOI: 10.2307/3899745

关键词:

摘要: Eleven plant associations were identified and characterized according to the frequency, percent cover, relative dominance of herbaceous woody species among vegetative strata, including stem density, diameter breast height (dbh), basal area for tree species: Cynosurus echinatus/Taeniatherum asperum; Bromus mollis/Cynosurus echinatus; Rhus diversiloba/Cynosurus Quercus garryana/Rhus diversiloba/Taeniatherum asperum/Cynosurus diversiloba/Dactylis glomerata; Pseudotsuga menziesii/Quercus gwyww/Rhwdha/oblyPoesti hwnitwnQr;curgwryww/Arbutus menziesii/Rhus Arbutus diversiloba/Festuca arundinacea; garryana/Fraxinus latifolia/Rosa elganteria/Juncus effusus; menziesii/Corylus cornuta/Cynosurus echinatus. The intensity duration recent disturbance distinguished early seral stages which by a paucity native shrub an abundance annual invaders in understory. primary forces that influenced existing assemblages fire more recently agricultural practices, especially grasslands savannas. Grasslands without livestock use exhibited greater diversity, supporting homogeneous distribution species.

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