Bluebunch Wheatgrass Response to Spring Defoliation on Foothill Rangeland

Spring elk grazing may reduce forage availability for wildlife or livestock in summer and may harm forage resources on foothill rangeland. We quantified bluebunch wheatgrass (Pseudoroegneria spicata [Pursh] A. Love) response to spring defoliation on foothill rangeland in southwestern Montana. Two ex...

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Published in:Rangeland ecology & management 2007-09, Vol.60 (5), p.498-507
Main Authors: Brewer, Tracy K., Mosley, Jeffrey C., Lucas, Daniel E., Schmidt, Lisa R.
Format: Article
Language:English
Subjects:
Cattle
Cervus elaphus nelsoni
clipping
Defoliation
defoliation response
dry matter accumulation
elk
Elks
field experimentation
Foothills
forage grasses
Grasses
grazing
Grazing management
height
herbivory
Management decisions
Mountains
overcompensation
Plants
Precipitation
Private property
Pseudoroegneria spicata
Range management
Rangelands
Research s
seasonal variation
Snow
spring
Steppes
Summer
temporal variation
topography
wild animals
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creator Brewer, Tracy K.
Mosley, Jeffrey C.
Lucas, Daniel E.
Schmidt, Lisa R.
description Spring elk grazing may reduce forage availability for wildlife or livestock in summer and may harm forage resources on foothill rangeland. We quantified bluebunch wheatgrass (Pseudoroegneria spicata [Pursh] A. Love) response to spring defoliation on foothill rangeland in southwestern Montana. Two experiments were conducted simultaneously on a foothill grassland site and a foothill sagebrush steppe site. Bluebunch wheatgrass plants (n  =  800) were selected and excluded from wild and domestic ungulates. Clipping treatments were applied in either early spring (mid- to late April) or late spring (mid- to late May), and plants were clipped to 1 of 3 residual heights (3, 6, or 9 cm) for 1, 2, or 3 successive years. Unclipped plants served as controls. Plant response was measured in late June and late July on both sites. April clipping for 3 successive years did not adversely affect bluebunch wheatgrass in June or July (P > 0.05) at either site. On foothill grassland, May defoliation to 3 cm for 2 consecutive years reduced leaf height (P  =  0.04) in July. May defoliation for 3 successive years to 3 or 6 cm reduced plant yield (P 
doi_str_mv 10.2111/1551-5028%282007%2960%5B498%3ABWRTSD%5D2.0.CO%3B2
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We quantified bluebunch wheatgrass (Pseudoroegneria spicata [Pursh] A. Love) response to spring defoliation on foothill rangeland in southwestern Montana. Two experiments were conducted simultaneously on a foothill grassland site and a foothill sagebrush steppe site. Bluebunch wheatgrass plants (n  =  800) were selected and excluded from wild and domestic ungulates. Clipping treatments were applied in either early spring (mid- to late April) or late spring (mid- to late May), and plants were clipped to 1 of 3 residual heights (3, 6, or 9 cm) for 1, 2, or 3 successive years. Unclipped plants served as controls. Plant response was measured in late June and late July on both sites. April clipping for 3 successive years did not adversely affect bluebunch wheatgrass in June or July (P &gt; 0.05) at either site. On foothill grassland, May defoliation to 3 cm for 2 consecutive years reduced leaf height (P  =  0.04) in July. May defoliation for 3 successive years to 3 or 6 cm reduced plant yield (P &lt; 0.05) and leaf height (P &lt; 0.05) in June, and May defoliation for 3 successive years to 3 cm reduced leaf height (P  =  0.02) in July. On foothill sagebrush steppe, 3 successive years of May defoliation to ≤ 9-cm stubble heights decreased leaf height in June (P &lt; 0.05). We conclude that foothill rangelands where bluebunch wheatgrass receives moderate or light defoliation (6–9-cm residual stubble heights) in mid- to late May should be limited to no more than 2 successive years of mid- to late May grazing, whereas sites that receive heavy to severe defoliation (≤ 3-cm residual stubble heights) in mid- to late May should not be grazed for 2 successive years during mid- to late May.</description><identifier>ISSN: 1550-7424</identifier><identifier>ISSN: 1551-5028</identifier><identifier>EISSN: 1551-5028</identifier><identifier>DOI: 10.2111/1551-5028%282007%2960%5B498%3ABWRTSD%5D2.0.CO%3B2</identifier><language>eng</language><publisher>Rangeland Ecology &amp; Management, P.O. 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May defoliation for 3 successive years to 3 or 6 cm reduced plant yield (P &lt; 0.05) and leaf height (P &lt; 0.05) in June, and May defoliation for 3 successive years to 3 cm reduced leaf height (P  =  0.02) in July. On foothill sagebrush steppe, 3 successive years of May defoliation to ≤ 9-cm stubble heights decreased leaf height in June (P &lt; 0.05). 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We quantified bluebunch wheatgrass (Pseudoroegneria spicata [Pursh] A. Love) response to spring defoliation on foothill rangeland in southwestern Montana. Two experiments were conducted simultaneously on a foothill grassland site and a foothill sagebrush steppe site. Bluebunch wheatgrass plants (n  =  800) were selected and excluded from wild and domestic ungulates. Clipping treatments were applied in either early spring (mid- to late April) or late spring (mid- to late May), and plants were clipped to 1 of 3 residual heights (3, 6, or 9 cm) for 1, 2, or 3 successive years. Unclipped plants served as controls. Plant response was measured in late June and late July on both sites. April clipping for 3 successive years did not adversely affect bluebunch wheatgrass in June or July (P &gt; 0.05) at either site. On foothill grassland, May defoliation to 3 cm for 2 consecutive years reduced leaf height (P  =  0.04) in July. 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Box 7065, Lawrence, KS 66044</cop><pub>Society for Range Management</pub><doi>10.2111/1551-5028%282007%2960%5B498%3ABWRTSD%5D2.0.CO%3B2</doi><tpages>10</tpages></addata></record>
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source JSTOR Archival Journals and Primary Sources Collection; Alma/SFX Local Collection
subjects Cattle
Cervus elaphus nelsoni
clipping
Defoliation
defoliation response
dry matter accumulation
elk
Elks
field experimentation
Foothills
forage grasses
Grasses
grazing
Grazing management
height
herbivory
Management decisions
Mountains
overcompensation
Plants
Precipitation
Private property
Pseudoroegneria spicata
Range management
Rangelands
Research s
seasonal variation
Snow
spring
Steppes
Summer
temporal variation
topography
wild animals
title Bluebunch Wheatgrass Response to Spring Defoliation on Foothill Rangeland
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