Natural regeneration of white spruce in aspen-dominated boreal mixedwoods following harvesting

作者：Martin DeMoor Jonathan^*; Lieffers Victor J; Macdonald S Ellen

来源：Canadian Journal of Forest Research, 2010, 40(3): 585-594.

DOI：10.1139/X10-016

In some boreal forests sites, there are considerable amounts of natural regeneration of white spruce (Picea glauca (Moench) Voss) after logging, even without silvicultural treatments to encourage establishment. We assessed the factors controlling the amount of this regeneration 8-15 years postharvest on previously aspen-dominated (Populus tremuloides Michx.) boreal mixedwood sites. We surveyed 162 transects across 81 cutovers, exploring the effects of mast years, season of harvest, distribution of seed trees, weather conditions around the time of harvest, and abundance of grass or woody vegetation on white spruce regeneration. Substantial amounts of naturally regenerated white spruce were found: however, sites with no seed trees had virtually no spruce regeneration. Average stocking was 7% (percentage of 9 m(2) plots along a transect across a cutover that had at least one seedling), ranging from 0% to 62%. Stocking levels were higher in cutblocks that had been harvested in the summer, prior to seedfall of a mast year, and where there was a seed source within 60 m. Stocking was lower when conditions were cool and wet the year before and 2 years after harvest and when the site contained extensive cover of grass or woody vegetation.

• 出版日期2010-3