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  • Frey, Brent R  (3)
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  • 1
    Online Resource
    Online Resource
    Soil nutrition and temperature as drivers of root suckering in trembling aspen
    Canadian Science Publishing ; 2002
    In:  Canadian Journal of Forest Research Vol. 32, No. 9 ( 2002-09-01), p. 1685-1691
    Details
    In: Canadian Journal of Forest Research, Canadian Science Publishing, Vol. 32, No. 9 ( 2002-09-01), p. 1685-1691
    Abstract: In two separate studies, the suckering of trembling aspen (Populus tremuloides Michx.) roots was assessed in response to different daily maximum soil temperatures and in relation to available nutrients (CaSO 4 and NH 4 NO 3 ). In the first study, aspen root sections were incubated under high:low temperature regimes of 12:8, 14:8, 16:8, 18:8, or 20:8°C until 124 degree-days above 8°C had been reached. Daily maximum temperature did not affect the number of suckers produced per square centimetre of root surface area or per root section. However, more time was required to initiate suckers on root sections grown under the 12:8°C temperature regime compared with those grown at 20:8°C. Furthermore, when calculated from a base temperature of 5°C, the number of degree-days needed to initiate aspen suckers was not different across the temperature regimes. In the second study, CaSO 4 , NH 4 NO 3 , or distilled water was added to aspen root sections. While nutrients did not affect the number of suckers produced, the addition of CaSO 4 or NH 4 NO 3 significantly increased sucker dry mass. Nutrient addition appeared to stimulate sucker growth and mobilization of stored reserves to support this growth.
    Type of Medium: Online Resource
    ISSN: 0045-5067 , 1208-6037
    URL: Article
    DOI: 10.1139/x02-080
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2002
    detail.hit.zdb_id: 1473096-0
    SSG: 23
    SSG: 12
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Predicting landscape patterns of aspen dieback: mechanisms and knowledge gaps
    Canadian Science Publishing ; 2004
    In:  Canadian Journal of Forest Research Vol. 34, No. 7 ( 2004-07-01), p. 1379-1390
    Details
    In: Canadian Journal of Forest Research, Canadian Science Publishing, Vol. 34, No. 7 ( 2004-07-01), p. 1379-1390
    Abstract: Sudden dieback and deterioration of mature aspen stands is commonly observed throughout North America. This dieback process has tremendous ecological and economic importance, yet remains poorly understood. This paper summarizes our understanding of aspen dieback in North America, identifies potential processes that contribute to reduced vigour and dieback of aspen stands, and examines the scales (stand, ecosite, regional) at which these processes operate. Many factors including pathogens, nutrition, or successional changes may be involved in the decline of aspen vigour and thereby contribute to the dieback process. However, insect defoliation, drought, and thawfreeze events appear to be the most likely factors initiating dieback in mature aspen stands. Further study is clearly needed to elucidate the mechanisms and landscape patterns of dieback. Information needs related to identifying processes and modeling landscape patterns of dieback are indicated.
    Type of Medium: Online Resource
    ISSN: 0045-5067 , 1208-6037
    URL: Article
    DOI: 10.1139/x04-062
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2004
    detail.hit.zdb_id: 1473096-0
    SSG: 23
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    An analysis of sucker regeneration of trembling aspen
    Canadian Science Publishing ; 2003
    In:  Canadian Journal of Forest Research Vol. 33, No. 7 ( 2003-07-01), p. 1169-1179
    Details
    In: Canadian Journal of Forest Research, Canadian Science Publishing, Vol. 33, No. 7 ( 2003-07-01), p. 1169-1179
    Abstract: Aspen (Populus tremuloides Michx.) is a clonal tree species that commonly regenerates via root suckering after disturbance. This paper reviews the literature and identifies critical gaps in our understanding of the dynamics of aspen root suckering. The role of plant growth regulators (e.g., hormones, carbohydrates), environmental conditions (e.g., soil moisture, temperature, nutrient availability), overstory disturbance (e.g., harvesting, wildfire), ground disturbance (e.g., soil compaction, wounding or severing of roots), vegetation competition, predisturbance stand condition, and clonal (genetic) differences are discussed as they relate to sucker initiation, sucker growth, and (or) patterns of site establishment. The paper presents a series of conceptual figures summarizing our knowledge of the factors controlling suckering dynamics and identifies areas of future research.
    Type of Medium: Online Resource
    ISSN: 0045-5067 , 1208-6037
    URL: Article
    DOI: 10.1139/x03-053
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2003
    detail.hit.zdb_id: 1473096-0
    SSG: 23
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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