Biomass harvesting and forest site productivity
Download
1 / 20

Biomass Harvesting and Forest Site Productivity - PowerPoint PPT Presentation


  • 125 Views
  • Uploaded on

Biomass Harvesting and Forest Site Productivity. Eric D. Vance National Council for Air and Stream Improvement (NCASI) Biomass/Bioenergy Workshop February 24-25, Houston, TX. Biomass Harvesting. Emerging markets for bioenergy Removal of biomass previously left on site Shorter rotations

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Biomass Harvesting and Forest Site Productivity' - elsa


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Biomass harvesting and forest site productivity

Biomass Harvesting and Forest Site Productivity

Eric D. Vance

National Council for Air and Stream Improvement (NCASI)

Biomass/Bioenergy Workshop

February 24-25, Houston, TX


Biomass harvesting
Biomass Harvesting

  • Emerging markets for bioenergy

  • Removal of biomass previously left on site

  • Shorter rotations

  • Concerns over site productivity, water, wildlife


Sustaining site productivity by manipulating site resources
Sustaining Site Productivity by Manipulating Site Resources

  • Water, nutrients, sunlight

  • Allocation of existing site resources

    • Competing vegetation, root growth

  • Increasing site resources

    • Artificially removing biomass and nutrients

    • Cannot always rely on natural replacement


Management intensity and site resources
Management Intensity and Site Resources

Intensive

Extensive

Available

Resources

Resource

Capital


Intensive Utilization of Harvest Residues in Southern Pine PlantationsM.H. Eisenbies, E.D. Vance, W.M. Aust, J.R. SeilerBioenergy Research (2009) 2:90-98

  • 32 million Mg yr-1 residues available in the South

  • 50-85 Mg ha-1 on site after stem-only harvest

  • 45-60% increase in mid-rotation fertilization may be needed to replace nutrients if residues removed


South Carolina Wet/Dry PlantationsHarvest Study (Virginia Tech, MeadWestvaco, NCASI)Residue-Soil Disturbance Matrix



Fall river long term soil productivity project univ of washington weyerhaeuser usfs ncasi
Fall River Long-Term Soil Productivity Project of Stand BiomassUniv. of Washington, Weyerhaeuser, USFS, NCASI

  • Conventional bole-only removal

  • Total stem (bole-only to a 5cm top)

  • Total-tree removal

  • Total-tree + legacy-wood removal

  • All cable-yarded


Fall river study douglas fir age 5 tree volume index
Fall River Study of Stand BiomassDouglas-fir Age 5 Tree Volume Index


Forest Service Long-Term Soil of Stand Biomass

Productivity Network

Core Sites

Affiliated Sites


Competing vegetation a critical factor
Competing Vegetation: of Stand BiomassA Critical Factor


Lake states aspen nutrient depletion and rotation length
Lake States Aspen of Stand BiomassNutrient Depletion and Rotation Length

  • Deficiencies rare

  • Older studies

    • Multiple, short-rotation cycles

    • Concluded 10-15 yr rotations sustainable

  • Reduced soil/foliar Ca on some sites

  • Indices underdeveloped


Aspen in the Lake States of Stand BiomassNutrient Budgets for Whole-tree Harvesting over 50 years(Mineral soils (lb/ac); Minnesota GEIS, Grigal 2004))

Ca capital = 15,125


Short rotation aspen on sandy soils a worst case scenario
Short Rotation Aspen on Sandy Soils: A Worst-Case Scenario? of Stand Biomass

  • < 1% Ca drain

    • (Grigal, 2004)

  • Three 20-yr rotations

    • < 5% Ca removed

  • 1 ton/ac wood ash


The forest calcium cycle likens et al 1998
The Forest Calcium Cycle of Stand Biomass(Likens et al. 1998)


Over a century of forest nutrition management in scandinavia
Over a Century of Forest Nutrition Management in Scandinavia of Stand Biomass

  • Science-based

  • Forest productivity

  • Forest health

  • Nutrient imbalances

    • Foliar, soil analysis

  • Biomass harvesting


Intensive harvest and site productivity what do we know
Intensive Harvest and Site Productivity: What Do We Know? of Stand Biomass

  • Many sites remarkably resilient

  • Little evidence for productivity declines

  • Preconceived notions often incorrect

  • Managers often know best


But more work is needed
But, More Work is Needed! of Stand Biomass

  • Sensitive sites

  • Fundamental impacts

  • Long-term, repeated removals

  • Indicators

  • Prevention, mitigation



ad