ERA

Download the full-sized PDF of Seasonal dynamics and defoliation impact on herbage yield in aspen boreal habitats of AlbertaDownload the full-sized PDF

Analytics

Share

Permanent link (DOI): https://doi.org/10.7939/R39K46644

Download

Export to: EndNote  |  Zotero  |  Mendeley

Communities

This file is in the following communities:

Agricultural, Food and Nutritional Science, Department of

Collections

This file is in the following collections:

Journal Articles (Agricultural, Food and Nutritional Science)

Seasonal dynamics and defoliation impact on herbage yield in aspen boreal habitats of Alberta Open Access

Descriptions

Author or creator
Donkor, Noble T.
Okello, Moses M.
Hudson, Robert J.
Bork, Edward W.
Additional contributors
Subject/Keyword
Herbage Production
Poa pratensis
Defoliation
Bromus inermis
Bromegrass
Bluegrass
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Within the aspen boreal ecosystems, little information exists on the seasonal dynamics of available herbage and the effects of varying defoliation regimes on accumulated herbage growth and associated opportunities for animal production. We examined seasonal changes in herbage phytomass in conjunction with defoliation treatments in Bromus inermis-Poa pratensis grasslands in central Alberta. Changes in herbage pools were examined by sampling at five monthly intervals from April to September 1997 and 1998, inclusive. Vegetation was also subjected to a factorial experiment with an initial defoliation in late-May, June or July, at heights of 2.5, 7.5, or 15 cm, and repeated at 3-, 6- or 9-week intervals until the end of September. Green herbage, standing dead and fallen litter increased from spring to summer and decreased from summer to fall. Average growing conditions resulted in a peak phytomass of 350 g m-2, and varied by year. Weathering losses of green herbage, standing dead and fallen litter over winter were 34%, 52% and 51%, respectively. Dry matter losses of total herbage (all three pools) over winter were 58% of 1997 summer green phytomass. Initial timing, height, and frequency of clipping all affected accumulated herbage yield (P < 0.001). The greatest accumulated herbage yield was from clipping initiated in May. Light clipping resulted in less phytomass accumulation relative to moderate and heavy clipping. Clipping frequencies of six and nine weeks resulted in similar phytomass removal, but were greater than herbage removal associated with three weeks frequency. The interaction between clipping date and frequency of clipping demonstrates the importance of temporal rest and sensitivity of forage plants to defoliation, and lends support to the use of rotational grazing systems.
Date created
2003
DOI
doi:10.7939/R39K46644
License information
© 2003 Ottawa Field-Naturalists' Club
Rights

Citation for previous publication
Donkor, N. T., Okello, M. M., Hudson, R. J., & Bork, E. W. (2003). Seasonal dynamics and defoliation impact on herbage yield in aspen boreal habitats of Alberta. Canadian Field Naturalist, 117(2), 196-202. Retrieved from:  http://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/682

Source

Link to related item

File Details

Date Uploaded
Date Modified
Audit Status
Audits have not yet been run on this file.
Characterization
File format: pdf (Portable Document Format)
Mime type: application/pdf
File size: 107258
Last modified: 2017:09:06 16:17:39-06:00
Filename: CFN_117_2_196.pdf
Original checksum: e71728a967b0ad52f56ab890740cb561
Well formed: false
Valid: false
Status message: Malformed dictionary offset=106232
File title: 05_01031_herbage.qxd
Page count: 7
Activity of users you follow
User Activity Date