The influence of forest harvesting activities on seismic line tree and shrub regeneration in upland mixedwood boreal forests

Abstract

Alberta’s forests are becoming increasingly disturbed and fragmented by the cumulative effects of anthropogenic disturbances exacerbated by the enduring footprint of seismic lines on the landscape. Forest harvesting and subsequent reforestation activities (e.g. site preparation and tree planting) may facilitate tree growth on seismic lines when forestry companies incorporate them into management areas. In this study, forest regeneration was assessed along transects on and off seismic lines within four cutblocks in northwestern Alberta. Tree, sapling, and shrub characteristics were measured and tree cookies from a subset of trees on and off seismic lines were used to model height growth. No difference in total tree, sapling, or shrub counts on and off seismic lines were found although trees on seismic lines were growing at slightly slower rates compared to the adjacent cutblock and Alnus viridis was more abundant on seismic lines. Our results suggest that, despite some species-level differences and slight differences in tree growth rates, trees on seismic lines within cutblocks are regenerating similarly to other trees growing in the post-harvest stand. These findings indicate that forest harvesting, and subsequent reforestation could represent an important tool in conducting landscape-level restoration in mixedwood forests where seismic lines have not naturally recovered.

Field sampling methods on seismic lines: a comparison between circular plots and belt transects

“…The recommended sampling methods discussed in this paper are therefore applicable to both treated and naturally regenerating seismic lines and across a variety of stand compositions within boreal mixedwood forests. For further discussion regarding the Site Type differences and the ecological implications of the data presented, see Van Dongen et al (2022).…”

Fifty years of change in the lower tree line in an arid coniferous forest in the Qilian Mountains, northwestern China

“…It is expected that the tree line in the eastern Himalayas will continue to expand in the end of the 21st century, resulting in the loss of at least 20% of its existing habitat for endemic plants [ 69 ]. Our study shows that, in addition to considering the increase of the elevation of the tree line, it is also necessary to consider the changes in the relationship between alpine plants brought about by the downward expansion of the tree line.…”