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dc.contributor.authorLacey, J. R.
dc.contributor.authorOlson-Rutz, K. M.
dc.contributor.authorHaferkamp, M. R.
dc.contributor.authorKennett, G. A.
dc.date.accessioned2020-09-23T18:32:34Z
dc.date.available2020-09-23T18:32:34Z
dc.date.issued1994-11-01
dc.identifier.citationLacey, J. R., Olson-Rutz, K. M., Haferkamp, M. R., & Kennett, G. A. (1994). Effects of defoliation and competition on total nonstructural carbohydrates of spotted knapweed. Journal of Range Management, 47(6), 481-484.
dc.identifier.issn0022-409X
dc.identifier.doi10.2307/4003001
dc.identifier.urihttp://hdl.handle.net/10150/644387
dc.description.abstractSpotted knapweed (Centaurea maculosa Lam.) is replacing native bunchgrasses and interfering with resource management objectives on many ranges in the northern Intermountain Region. Herbicides, biological control agents, and fire have not successfully contained spotted knapweed. Since knapweed is grazed in some situations, effects of defoliation and competition on total nonstructural carbohydrates (TNC) of spotted knapweed plants were determined in this study. Transplanted knapweed plants were grown for 6 months in a greenhouse under 3 levels of competition with bluebunch wheatgrass (Pseudoroegneria spicata [Pursh] Love) and 3 levels of defoliation. Total nonstructural carbohydrates (pool and concentration) were determined at the end of the experiment. Concentration and pools of carbohydrates generally varied among stems, roots, crowns, and with monthly defoliations. Importance of stems for carbohydrate storage was more evident in analyses of pools rather than concentrations. Monthly defoliations decreased carbohydrate concentrations by about 50%, and pools by about 80% respectively within stems, roots, and crowns. While competition from bluebunch wheatgrass influenced total nonstructural carbohydrates concentrations, it did not influence pools. Although frequent defoliations of spotted knapweed reduced carbohydrates, other factors probably limit the feasibility of using grazing animals to control spotted knapweed on native bunchgrass ranges in western North America.
dc.language.isoen
dc.publisherSociety for Range Management
dc.relation.urlhttps://rangelands.org/
dc.rightsCopyright © Society for Range Management.
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectPseudoroegneria spicata
dc.subjectcarbohydrates
dc.subjectCentaurea maculosa
dc.subjectintroduced species
dc.subjectplant competition
dc.subjectgrazing
dc.titleEffects of defoliation and competition on total non-structural carbohydrates of spotted knapweed
dc.typetext
dc.typeArticle
dc.identifier.journalJournal of Range Management
dc.description.collectioninformationThe Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform August 2020
dc.source.volume47
dc.source.issue6
dc.source.beginpage481-484
refterms.dateFOA2020-09-23T18:32:34Z


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