Show simple item record

dc.contributor.authorBai, Yuguang
dc.contributor.authorThompson, Don
dc.contributor.authorBroersma, Klaas
dc.date.accessioned2020-09-05T21:15:55Z
dc.date.available2020-09-05T21:15:55Z
dc.date.issued2004-11-01
dc.identifier.citationBai, Y., Thompson, D., & Broersma, K. (2004). Douglas fir and ponderosa pine seed dormancy as regulated by grassland seedbed conditions. Journal of Range Management, 57(6), 661-667.
dc.identifier.issn0022-409X
dc.identifier.doi10.2111/1551-5028(2004)057[0661:DFAPPS]2.0.CO;2
dc.identifier.doi10.2307/4004025
dc.identifier.doi10.2458/azu_jrm_v57i6_bai
dc.identifier.urihttp://hdl.handle.net/10150/643223
dc.description.abstractTree encroachment in the ecotone between grassland and forest of interior British Columbia has resulted in decreasing grazing potential of rangelands. The 2 dominant tree species in this region, Douglas fir (Pseudotsuga menziesii var. glauca) and ponderosa pine (Pinus ponderosa), require stratification for seed dormancy release. The objective of this study was to determine whether seeds of these species can be stratified and dormancy released under grassland conditions. Field stratification experiments were conducted over 4 years using 2 Douglas fir and 3 ponderosa pine seed collections. A laboratory experiment was conducted to determine the effect of seedcoat removal, light, and stratification duration on dormancy release. Dormancy in Douglas fir and ponderosa pine was released after 1 to 2 months of stratification under grassland seedbed conditions when seeds were placed in the field in late fall and early winter. Continuous stratification until the following May was correlated with higher germination rate. One week of stratification in the laboratory was sufficient to break dormancy in the 2 species and a similar effect can be achieved by exposure to light. Seed coat removal for ponderosa pine also released dormancy, indicating that this structure imposes dormancy. Therefore, the grassland seedbeds near the forest edge can provide suitable conditions to break dormancy of Douglas fir and ponderosa pine seeds, contributing to tree encroachment into adjacent grasslands. Managements aiming to control tree encroachment should take the interaction between tree seed and grassland seedbed conditions into consideration, and the control should be focused on the elimination of seeds and seedlings but not on the germination stage.
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.subjectPinus ponderosa
dc.subjectPseudotsuga menziesii var. glauca
dc.subjecttree encroachment
dc.subjectseed coat
dc.subjectseedbed ecology
dc.subjectlight
dc.titleDouglas Fir and Ponderosa Pine Seed Dormancy as Regulated by Grassland Seedbed Conditions
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.volume57
dc.source.issue6
dc.source.beginpage661-667
refterms.dateFOA2020-09-05T21:15:55Z


Files in this item

Thumbnail
Name:
12510-12529-1-PB.pdf
Size:
155.6Kb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record