MONITORING CONCERNS

[Last update: 02/15/2008]
[Most recent addition of documents: 03/07/2007]

The eight topics displayed here were identified by the soil scientists of Region 1 as the most important concerns or issues related to soil quality. Each topic has its own guidelines, methods for measurement, associated problems, methods for avoidance and amelioration, pertinent research and literature list.

BURNED SOIL

Soils are severely burned if all surface organic matter is consumed and the blackened layer is more than 1 inch deep. Oxidized soil (reddish color) is also indicative of severely burned soil.

Measurement

Guidelines

Problems

Effects

Solutions

Research summary

Literature

  • DeBano, L. F. The Effect of Fire on Soil Properties (HTML)
  • Fire Effects Information System (FEIS) located at https://www.fs.fed.us/database/feis/. (FEIS summarizes and synthesizes research about living organisms in the United States—their biology, ecology, and relationship to fire.)
  • Hungerford, R. D.; Harrington, M. G.; Frandsen, W. H.; Ryan, K. C.; Niehoff, G. J. Influence of Fire on Factors that Affect Site Productivity (HTML). In: Proceedings—Management and Productivity of Western-Montane Forest Soils, April 10–12, 1990, Boise, ID, USDA Forest Service General Technical Report INT-280, August 1991.
  • Page-Dumroese, D.; Jurgensen, M.; Abbott, A.; Rice, T.; Tirocke, J.; Farley, S.; DeHart, S. Monitoring Changes in Soil Quality from Post-fire Logging in the Inland Northwest (PDF available at https://forest.moscowfsl.wsu.edu/smp/docs/dumroese/RMRS-P-41_605-614.pdf). In:  Andrews, Patricia L.; Butler, Bret W., comps. 2006. Fuels Management. How to Measure Success: Conference Proceedings. 28-30 March 2006; Portland, OR. Proceedings RMRS-P-41. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. pp 605–614.

COMPACTION

Measurement

No quantitative measure of soil compaction exists. Instead, approximations based on changes in soil characteristics are substituted for direct measurement.

Procedures:

  • Core sampling - Deb: Is there a paper describing this procedure (thumping)?
  • Cone Penetrometer - Locate a user's manual.
  • Spade - Locate a description (Clayton, et al. 1987).
  • Infiltrometer (percolation test) - ???

Guidelines

A 15% increase (20% in volcanic ash soils) in natural bulk density or a 50% reduction in the infiltration rate is considered detrimental.

Problems

Soil compaction is accompanied by decreases in soil permeability and porosity, air exchange, root penetration, and infiltration. Associated problems include

  • loss of moisture holding capacity
  • decreased rooting zone
  • loss of C, N, and P sources
  • changes in soil pH
  • changes in soil bulk density
  • increased erosion due to increased overland flow

Effects

Soil compaction presents a physical barrier to root growth, inhibiting seedling and mature tree growth. Compaction may also reduce tree growth by reducing oxygenation of the roots, preventing adequate water movement, and limiting mycorrhizal growth (Froehlich and McNabb 1984).

Solutions

Research Summary

Factors affecting soil compactability include:

  • Soil moisture
  • Soil texture
  • Soil bulk density

Links

Literature

DISPLACEMENT

Detrimental displacement is displacement that results in "the loss of as much as 1 inch or one-half of the humus-enriched surface layer (A-horizon), whichever is less." The loss of the organic layer alone could be detrimental on some marginal sites.

Lateral displacement of soil may decrease productivity by disruption of water distribution, damage to root systems or, in extreme cases, uprooting and toppling of trees. Studies have attempted to quantify the relationship between lateral soil displacement and productivity (Clayton 1987).

Natural erosion and slope failure are considered to be beyond the scope of this document, except where efforts to control them have altered the landscape forming processes (sedimentation dams, post-harvest mulching, contouring, etc.).

Measurement

Guidelines

Problems

Effects

Solutions

Research summary

Literature

GROUND COVER

The minimum cover, following the cessation of disturbance in an activity area, should be sufficient to prevent accelerated runoff and prevent erosion from exceeding the rates of natural soil formation.

Erosion rates are dependent on soil erodibility (k-factor), erosivity (rainfall factor), and slope gradient and length. Local adjustment of these factors by geographic area or potential natural plant community types may be required.

On rangelands, at least 80% of the A or surface horizon should be occupied by abundant fine and very fine roots.

Measurement

Guidelines

Problems

Effects

Solutions

Research summary

Literature

  • Busse, Matt D.; Samual E. Beattie; Robert F. Powers; Felipe G. Sanchez and Allan E. Tiarks. Microbial community responses in forest mineral soil to compaction, organic matter removal, and vegetation control. Can. J. For. Res. (abstract and full text available at https://www.treesearch.fs.fed.us/pubs/22169). 2006. 36(3): 577–588.
  • Everett, R.; Zabowski, D.; McColley, P. Vegetative Restoration of Western-Montane Forest Soils (HTML). In: Proceedings—Management and Productivity of Western-Montane Forest Soils, April 10–12, 1990, Boise, ID, USDA Forest Service General Technical Report INT-280, August 1991.
  • Fleming, Robert L.; Robert F. Powers; Neil W. Foster; J. Marty Kranabetter; D. Andrew Scott; Felix Ponder, Jr.; Shannon Berch; William K. Chapman; Richard D. Kabzems; Kim H. Ludovici; David M. Morris; Deborah S. Page-Dumroese; Paul T. Sanborn; Felipe G. Sanchez; Douglas M. Stone and Allan E. Tiarks. Effects of organic matter removal, soil compaction, and vegetation control on 5-year seedling performance: a regional comparison of Long-Term Soil Productivity sites. Can. J. For. Res. (abstract and full text available at https://www.treesearch.fs.fed.us/pubs/22170). 2006. 36(3): 529–550.
  • Hironaka, M.; Fosberg, M. A.; Neiman, K. E. Jr. The Relationship Between Soils and Vegetation (HTML). In: Proceedings—Management and Productivity of Western-Montane Forest Soils, April 10–12, 1990, Boise, ID, USDA Forest Service General Technical Report INT-280, August 1991.
  • Jensen, M. E. Ecological Classification and Cumulative Soil Effects (PDF - 449 KB). In: Proceedings—Management and Productivity of Western-Montane Forest Soils, April 10–12, 1990, Boise, ID, USDA Forest Service General Technical Report INT-280, August 1991.
  • Wilson, S. D. and H. R. Kleb. 1996. The influence of prairie and forest vegetation on soil moisture and available nitrogen. The American Midland Naturalist. 136: 222–231.

NUTRIENT CYCLING

Measurement

Guidelines

Problems

Effects

Solutions

Research summary

Literature

PUDDLING

The deformation of wet soil with sufficient clay results in puddling. Soil puddling that adversely affects hydrologic function and site productivity is detrimental.

Measurement

Guidelines

Problems

Effects

Solutions

Research summary

Literature

REGENERATION

Studies from the Pacific Northwest indicate that disturbance can reduce ectomycorrhizal formation and forest regeneration. However, the degrees of reduction and impact on forest regeneration vary widely and depend on many factors. Among these are the type and severity of disturbance, ectomycorrhizal diversity, climatic conditions, biotic conditions, and the effects of nonhosts over time. Mycorrhizal formation and regeneration are most greatly impacted on severely disturbed and environmentally limited sites. The rapid occupation of such sites by ectomycorrhizal host plants following disturbance is critical to stabilizing native mycorrhizal populations that may aid forest regeneration.

Measurement

Guidelines

Problems

Effects

Solutions

Research summary

Literature

SURFACE ORGANICS

Currently, there are no specific requirements for litter retention. Ground cover requirements generally assure sufficient litter retention.

The minimum amounts of large woody debris required to maintain nutrient supplies adequate to sustain site productivity are ascertained by research studies (Harvey, 1987).

In general, a figure of 15 tons per acre is used for harvested or burned sites. This figure varies by habitat type, from 10 to 40 tons per acre.

Measurement

Guidelines

Problems

Effects

Solutions

Research summary

Literature