Seasonal variation of growth and development of the roots of five second year conifer species in the nursery
Every other week over their second growing season, stem height, collar diameter, shoot and root dry masses, number of lateral roots and length of the tap root were measured on nursery grown seedlings ofAbies balsamea L. Mill.,Pinus banksiana Lamb.,Pinus resinosa Ait.,Picea mariana Mill. BSP andPicea glauca Moench Voss. Root elongation, branching and mycorrhizal development were also recorded.
Given species showed distinct seasonal growth patterns. The rate and timing of maximum root growth (mg/dry weight/week) differed markedly between species.
Except for the increase in height ofPinus banksiana, root and shoot growth were not negatively correlated.
The results are discussed in relation to the performance of tree seedlings in the nursery.
Key wordsAbies balsamea Coniferous species Picea glauca Picea mariana Pinus banksiana Pinus resinosa Root growth
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