Skip to Main Content
Biomass growth response to spatial pattern of variable-retention harvesting in a northern Minnesota pine ecosystemAuthor(s): Brian J. Palik; Rebecca A. Montgomery; Peter B. Reich; Suzanne B. Boyden
Source: Ecological Applications
Publication Series: Scientific Journal (JRNL)
Station: Northern Research Station
Download Publication (1.0 MB)
DescriptionVariable-retention harvesting (VRH) is an approach for sustaining complex structure in managed forests. A criticism of VRH is that ecological benefits may come at a cost of reduced growth of regeneration, due to competition with residual trees. However, the spatial pattern of retention, i.e., dispersed or aggregated, in VRH systems can be manipulated to minimize suppression of regeneration, and resource limitation to regeneration might be mitigated by reduction of woody shrubs. Continued growth of the residual cohort will compensate for growth reduction of regeneration, although this may differ with retention pattern. We examined aboveground whole-stand biomass growth of trees in a VRH experiment in Pinus resinosa forest in Minnesota, USA. Treatments included dispersed retention, aggregated retention, and an uncut control, as well as a shrub treatment (reduced density or ambient). We addressed the following hypotheses: (1) biomass growth of a cohort of planted pine seedlings will be highest with aggregated rather than dispersed retention, (2) biomass growth of the planted seedlings will increase with shrub reduction, and (3) biomass growth of the residual overstory will be higher with dispersed rather than aggregated retention. Aboveground biomass growth of the planted pines ranged from 0.4 kg·ha-1·yr-1 in the overstory-control–ambient-shrub treatment to 23 kg·ha-1·yr-1 in the aggregated-retention– shrub-reduction treatment. The difference between the control and the retention treatments was significant (P < 0.0001), but not between dispersed and aggregated retention (P = 0.97). Thus, our first hypothesis was not supported. In all treatments, biomass growth was significantly higher (>100% increase) with shrub reduction (P=0.001), supporting our second hypothesis. Biomass growth of residual trees ranged from 2404 kg·ha-1·yr-1 in the uncutcontrol– ambient-shrub treatment to 1043 kg·ha-1·yr-1 in the aggregated-retention–shrubreduction treatment. Differences were significant between the control and retention treatments (P =0.003), and marginally higher with dispersed vs. aggregated retention (P =0.09), lending support to our third hypothesis. Our results suggest that managers have flexibility in application of VRH and can expect similar stand-level biomass growth of planted regeneration regardless of retention pattern, but somewhat higher stand-level biomass growth of retained trees with dispersed retention.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationPalik, Brian J.; Montgomery, Rebecca A.; Reich, Peter B.; Boyden, Suzanne B. 2014. Biomass growth response to spatial pattern of variable-retention harvesting in a northern Minnesota pine ecosystem. Ecological Applications. 24(8): 2078-2088. https://doi.org/10.1890/13-1173.1.
Keywordsaggregated retention, biomass growth, dispersed retention, Pinus resinosa, planted seedlings, residual trees, tree regeneration, variable-retention harvesting
- New cohort growth and survival in variable retention harvests of a pine ecosystem in Minnesota, USA
- Decade-long bird community response to the spatial pattern of variable retention harvesting in red pine (Pinus resinosa) forests
- Effects of variable retention harvesting on natural tree regeneration in Pinus resinosa (red pine) forests
XML: View XML