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Overview
Basics
Basics
Quaking aspen (Populus tremuloides) forest communities in the Lake Tahoe Basin are undergoing succession to conifers that impact aspen vigor and stifle natural regeneration. Removal of conifers from aspen stands is undertaken around the Lake Tahoe Basin. However, little is known about stocking and treatment persistence: specifically, how much growing space must be provided to aspen trees and their root sucker regeneration for vigorous growth to be sustained until the next restorative thinning. The report introduces the Aspen Stocking Assessment Model and provides examples of its use in simulating aspen conifer stand development before and after restorative thinning.
Completed
2009
2010
2013
$147,801
Kat McIntyre (KMcIntyre@trpa.gov)
10/30/2017
10/30/2017
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| Location Information | Location Notes |
|---|---|
Organizations
EIP Details
EIP Basics
EIP Basics
04.01.01.0106 - P051: Stocking Guidelines for Aspen Restoration: Predicting Treatment Persistence After Successive Conifer Removals
Performance Measures
Expected Performance Measures
Expected Performance Measures
No expected performance measures set for this project.
Reported Performance Measures
Reported Performance Measures
No annual performance measure accomplishments entered for this project.
Funding
Expected Funding
Expected Funding
$147,801
$147,801
$0
| Total | |||
|---|---|---|---|
| Southern Nevada Public Land Management Act (Pacific Southwest Research Station) (USFS - PSW) | $147,801 | $147,801 | $0 |
| Grand Total | $147,801 | $147,801 | $0 |
Reported Expenditures
Reported Expenditures
| Total | 2013 | 2012 | 2011 | 2010 | 2009 | |
|---|---|---|---|---|---|---|
| Southern Nevada Public Land Management Act (Pacifi... | $147,801 | $29,560 | $29,561 | $29,560 | $29,560 | $29,560 |
| Grand Total | $147,801 | $29,560 | $29,561 | $29,560 | $29,560 | $29,560 |
Photos
Other Details
Watersheds
No watersheds set for this project.
Threshold Categories
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Quaking aspen forest communities in the Lake Tahoe Basin are being encroached and out-competed by conifers that impact aspen vigor and stifle natural regeneration. Removal of conifers has been advocated, and is being tested around the Tahoe Basin.
Local and Regional Plans
No Local and Regional Plans set for this project.
Related Projects
Related Projects
No Related Projects set for this project.
External Links
No external links entered.
Notes
Notes
| 10/30/2017 1:15 PM | Matt Driscoll | Match Funding: $ 43,249 | ||
| 07/25/2017 9:43 PM | Kiara Cuerpo-Hadsall | Objectives: This report introduces the Aspen Stocking Assessment Model and provides examples of its use in simulating aspen-conifer stand development before and after restorative thinning. Tree data collected in 2 1/2 acre (one hectare) plots around the Lake Tahoe Basin were used to initiate the model. Different diameter-limit thinning prescriptions (i.e., cut all conifer below a defined size) were simulated by removing records for smaller (cut) trees from the plot data and then recalculating density and average tree size for input into the Aspen Stocking Assessment Model. This approach ensured that model simulations were based on realistic pre- and post-thinning values. |
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| 07/25/2017 9:33 PM | Kiara Cuerpo-Hadsall | Findings: • The Aspen Stocking Assessment Model forecasted a 15-year treatment persistence, after which time the stand had returned to pre-treatment stand density index (SDI), and a second thinning was scheduled. For the second treatment, we compared three alternatives: 20, 24, or 30 in. (50, 60, or 75 cm) DBH limit thinning, and again forecast growth of each tree species using the Aspen Stocking Assessment Model. These treatments had 23-, 29- and 40-year persistence, respectively. The heaviest thinning treatment generated ~28 US short tons ac-1 (~64 metric tons ha-1) of dry cut wood. • Treatment persistence, defined here as the time taken for stands to return to their pre-treatment crowding levels, varied according to pretreatment stand density, species composition, and thinning intensity. • The Aspen Stocking Assessment Model indicated that 36 years after the 24-inch DBH limit thinning, once the stand had again exceeded pre-treatment SDI, the new cohort of regenerating conifers collectively represented only 14% of stand density; the remainder being aspen or large residual conifers that had grown larger than 30 in. (75 cm) DBH. *** See www.fs.fed.us/PSW/partnerships/tahoescience for additional findings. |
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| 07/25/2017 9:32 PM | Kiara Cuerpo-Hadsall | Management Implications: The Aspen Stocking Assessment Model is a flexible, transparent spreadsheet-based model that allows the user to schedule restoration thinning and ‘grow’ aspen-conifer stands forward in time, before and after multiple thinning treatments. |
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| 07/25/2017 9:32 PM | Kiara Cuerpo-Hadsall | Publications: Berrill, J. P., & Dagley, C. M. 2012. Geographic patterns and stand variables influencing growth and vigor of Populus tremuloides in the Sierra Nevada (USA). International Scholarly Research Notices, 2012. Berrill, J. P., & Dagley, C. M. 2014. Regeneration and Recruitment Correlate with Stand Density and Composition in Long-Unburned Aspen Stands Undergoing Succession to Conifer in the Sierra Nevada, USA. Forest Res, 3(119), 2. |