Forest Investment Account

Abstract of FII Project R02-40

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Plant Species Diversity and Soil Quality Changes in Aspen Stands

Author(s): Broersma, Klaas (BC Ministry of Agriculture and Agri-Food)
Subject: Forestry, Landscape ecology
Series: Forest Investment Account (FIA) - Forest Science Program


Summer and winter logging significantly increased aspen and total stem density relative to unlogged blocks, whereas ten years of cattle grazing had no significant impact on stem density. Increases in stem density did not significantly affect forage production, although the combination of ungrazed, winter-logged blocks resulted in significantly higher production values than did any other treatment combination. Logging effects on plant diversity could not be assessed due to temporal variation (i.e. data was collected at different times). Ten years of summer grazing, within summer-logged blocks, resulted in the increase of several forb and shrub species and a general increase in species richness in grazed blocks. Grazing resulted in the decline of two forb and two shrub species, an indication that these species were preferred by cattle in these blocks. Aspen density and plant species diversity was not adversely affected by grazing and forage production was not affected by logging activities, indicating there is no land-use conflict on these blocks.

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Updated August 26, 2005 

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