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The Long-Term Soil Productivity (LTSP) study was borne out of concerns regarding detrimental soil disturbance resulting from timber harvest and mechanical site preparation. Specifically, scientists identified two key changes in soil properties that could reduce subsequent forest productivity: losses in soil porosity and aeration, caused by compaction under repeated machine traffic; and organic matter removal, which can occur with whole-tree harvest and displacement of surface organic horizons (forest floor). Retrospective studies of soil disturbance effects on stand productivity were often equivocal; consequently, in the 1990s, an effort was made to establish a more rigorous experimental design that would test the long-term, interactive effects of compaction and organic matter removal on forest soils. There are now well over 50 of these LTSP installations in North America (Page-Dumroese et al. 202 1). n British Columbia, a total of 14 LTSP replicates were established throughout the Northern and Southern Interior to test soil disturbance effects on yields of commercial tree species across a range of soils and climates. Most of these installations are now more than 20 years old, and individual study conclusions regarding early tree growth response have been published (Kabzems 2012; Kranabetter et al. 2017; Curran et al. 202 1; Wallace et al. 202 1). In this Extension Note, we present a provincial perspective by comparing study results after these initial decades, using stand basal area to integrate both tree productivity and stocking (survival) effects on treatment outcomes.
Kranabetter, J.M., J.M.; Curran, M.C.; Kabzems, R.D.; Lilles, E.B.; Miller, B.G.N.; Murray, M.P.; Philpott, T.J.; Wallace, B.M.. 2022. The Long-Term Soil Productivity Study of British Columbia: Effects of Organic Matter Removal and Compaction on Stand Productivity after Two Decades. MoF. Extension Note (FLNRORD). EN126
Topic: FLNRORD Research Program
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