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Stability of grazed patches on rough fescue grasslands
Author
Willms, W. D.
Dormaar, J. F.
Schaalje, G. B.
Publisher
Society for Range Management
Publication Year
1988-11-01
Body

Continuous stocking usually leads to the formation of grazed patches. However, the effect of patches on the grassland community is related to their stability. Therefore, we studied the spatial stability of grazed patches on Rough Fescue Grasslands by mapping forage removal classes on 10 sites over a 4-year period, testing stability using the Kappa index (K), and characterizing the soils and vegetation of overgrazed and undergrazed patches. Spatial stability of grazed patches between consecutive years was good (K is greater than or equal to 0.26) on sites experiencing low grazing pressure. However, on sites having high grazing pressure, spatial stability was less consistent between consecutive years (0>K is lesser than or equal to 0.45) and low over a 4-year period (K is lesser than or equal to 0.10). Overgrazed patches were dominated by grazing-resistant seral species, but undergrazed patches were dominated by climax species. Rough fescue (Festuca scabrella) and Parry oat grass (Danthonia parryi) plants were 50% shorter, and forage production was about 35% less, on overgrazed than on undergrazed patches. Soil organic matter, carbohydrates, and depth of Ah horizon were significantly greater on undergrazed patches but urease activity, NO3-N, NH4, and available phosphorus were greater on overgrazed patches. Overgrazed and undergrazed patches were stable in the long term, although patch boundaries fluctuated. This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries. The 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. Migrated from OJS platform August 2020

Language
en
Resource Type
Text
Document Type
Journal Issue/Article
Digital Object Identifier (DOI)
10.2307/3899527
Additional Information
Willms, W. D., Dormaar, J. F., & Schaalje, G. B. (1988). Stability of grazed patches on rough fescue grasslands. Journal of Range Management, 41(6), 503-508.
ISSN
0022-409X
OAI Identifier
oai:repository.arizona.edu:10150/645087
Journal Volume
41
Journal Number
6
Journal Pages
503-508
Collection
Rangeland Ecology & Management (REM)
Journal Name
Journal of Range Management
Keywords
Festuca altaica
plant community analysis
danthonia parryi
grasslands
yields
Alberta
stocking rate
botanical composition
livestock
grazing
forage