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Fonds consists of the research records of Dr. Paul Sanborn, a University of Northern British Columbia faculty member in the Department of Ecosystem Science and Management.

Series consists of reference material collected by Dr. Paul Sanborn, including field trip guidebooks, resource inventory documents, collected sources for various areas of research, and proceedings and abstracts for conferences and workshops.

Research on the ecological functions of coarse woody debris (CWD) in forests, and techniques for inventorying CWD, were major topics for forest ecologists and soil scientists during Paul Sanborn's years with BC Forest Service research program (1991-2002).

File of documents consists mostly of unpublished internal and consultant reports, workshop summaries & handouts, and government publications (BC, Canada, USA). Methods-related documents may have been drafts which were superseded later by published manuals. In some cases, the document has a memo or email attached which provides some additional context.

Includes the following items:

BIOFOR Resource Consultants. (n.d.) Methodology for developing coarse woody debris photo guides. [consultant report to Ministry of Forests, Research Branch]

Brown, J.K., T.E. See. 1981. Downed dead woody fuel and biomass in the northern Rocky Mountains. General Technical Report INT-117. USDA Forest Service.

Clark, D.F., P.J. Burton, J.A. Antos. 1995. A comparative study employing different methods for inventory of coarse woody debris. Symbios Research and Restoration, Smithers, BC. September 30, 1995.

Ellis, R. 1996. Summary of the coarse woody debris workshop, Cowichan Lake Research Station, April 11-12, 1996. [Incl. handouts by A. Mackinnon, S.W. Taylor & J.V. Parminter]

Ember Research Services Ltd. 1997. CWD/Fuel calculator user’s guide. October 1997.

Hermanek, H. 2001. The distribution and description of CWD in the SBSmk1 and IDFdm2 zones of British Columbia. Work term report, Biology Co-op Program, University of Victoria.

Lajzerowicz, C. 2000. Coarse woody debris: what are we leaving in British Columbia. Examining TRENDS. ET2000-02. Northern Interior Vegetation Management Association.

Lajzerowicz, C. 2000. Coarse woody debris: what are the changes following harvesting in Alberta. Examining TRENDS. ET2000-03. Northern Interior Vegetation Management Association.

Lloyd, R. 2001. A comparison of coarse woody debris in harvested and unharvested sites in the SBSmc2: First-year report, March 2001. Prepared for: Houston Forest Products.

Mackinnon, A. 1996. What kind of CWD measurements are MOF research ecologists using? [handout at CWD Workshop, April 11-12, 1996]

Mackinnon, A., J. Parminter. 1996. Natural landscape patterns and processes. Notes from a meeting at Cowichan Lake Research Station, April 10, 1996.

Marshall, P.L. 1999. Using line intersect sampling to determine the volume of odd-shaped pieces of coarse woody debris: an explanation of the Vegetation Resources Inventory formula. Contract report to: Ministry of Forest, Vancouver Region. February 1999.

Marshall, P.L., G. Davis, V.M. LeMay. 2000. Using line intersect sampling for coarse woody debris. Forest Research Technical Report, TR-003. Vancouver Forest Region.

Ministry of Forests, Resources Inventory Branch 1999. Pilot study for dead tree information on growth and yield permanent sample plots.

Parminter, J. 1994. Correction factors and the measurement of coarse woody debris. Research Branch, Ministry of Forests. March 11, 1994.

Parminter, J. 2001. Natural disturbance research and project summaries. Cowichan Lake Research Station meeting, April 10, 1996.

Parminter, J. 2001. Procedures for measuring CWD volume in spot accumulations, landing piles and strip accumulations.

Parminter, J. 2001. CWD extensive pilot program – sampling of CWD in cutblocks.

Robson Valley Enhanced Forest Management Pilot Project. 2001. Field data collection protocol manual: coarse woody debris survey 2001. [attached covering email from B. Rogers]

Rogers, B. 2001. Robson Valley Enhanced Forest Management Pilot Project, Coarse Woody Debris Assessment Phase I: Working Plan 2001. Prepared for: Ministry of Environment, Lands and Parks. March 3, 2001.

Snag Protocol Team. 2000. Northern region snag management protocol: January 2000. USDA Forest Service, Northern Region.

Taylor, S.W., J.V. Parminter. 1996. Effects of broadcast burning on coarse woody debris in British Columbia. [handout at CWD Workshop, April 11-12, 1996]

Graham, R.T. et al. 1994. Managing coarse woody debris in forests of the Rocky Mountains. Research Paper INT-RP-477. Intermountain Research Station, USDA Forest Service. Available online at: https://www.fs.usda.gov/research/treesearch/24829 (accessed March 2023)

Harmon, M.E., J. Sexton. 1996. Guidelines for measurements of woody debris in forest ecosystems. Publ. No. 20. U.S. LTER Network Office. Available online at: https://andrewsforest.oregonstate.edu/pubs/webdocs/reports/detritus/publications/Guidelines%20for%20Measurements%20of%20Woody%20Detritus%20in%20Forest%20Ecosystems.pdf (accessed March 2023)

Rogers, B. 2002. Robson Valley Enhanced Forest Management Pilot Project, Coarse Woody Debris Assessment Phase III: Final Report. Prepared for: Ministry of Environment, Lands and Parks. Available online at: https://www.env.gov.bc.ca/omineca/documents/cwd_2002_reportf.pdf (accessed March 2023)

Stevenson, Susan K. (March 1999). Biodiversity assessments at silvicultural systems sites, summer 1998. Prepared for: Prince George Forest Region, BC Ministry of Forests, Prince George BC. 16 p. + 16 p. graphs

Taylor, S.W. 1997. A field estimation procedure for downed coarse woody debris. Technology Transfer Notes. No. 2, August, 1997. Available online at: https://publications.gc.ca/site/eng/409169/publication.html (accessed March 2023)

File of documents consist of a mixture of internal government reports, including reports prepared by consultants, superseded manuals, and training manuals. Most deal with soil conservation in forestry settings, but there is a report on soil conservation in relation to agricultural soils which Paul Sanborn did under contract to Agriculture Canada in 1991.

Includes the following items:

Cuthbert, John. 1991. Why the concern about soil degradation in British Columbia? An address by John Cuthbert, Chief Forester, Ministry of Forests to be delivered by Lois Dellert, Acting Assistant Chief Forester to the 1991 Logging Seminar, October 1991. Prince George, B.C.

J. Hunt & Associates Inc. 1998. Soil compaction and disturbance: status of forestry research and operational trials in British Columbia. Prepared for Lorne Bedford, British Columbia Ministry of Forests, Forest Practices Branch, March 1998.

Ministry of Forests (n.d. – probably ca. 1990). Soil conservation guidelines for timber harvesting: interior British Columbia.

Ministry of Forests. 1994. Interim soil conservation guidelines for mechanical site preparation: interior British Columbia.

Ministry of Forests (n.d. – probably ca. 1993-95). [excerpt: internal report on soil physical properties in relation to soil disturbance at research site near 70 Mile House, B.C.]

Ministry of Forests. 1996. Audit level soil conservation survey course.

Ministry of Forests. 2002. Forest soil conservation and rehabilitation in British Columbia: opportunities, challenges, and techniques … with examples from recent research. Forest Science Program. March 2002. Available online at https://www.for.gov.bc.ca/hfd/pubs/docs/bro/bro70.pdf (accessed 2023)

Ministry of Forests. 2005. Protocol for soil resource stewardship monitoring: cutblock level. Version 1.0.

Ministry of Forests. 2005. Protocol for soil resource stewardship monitoring: cutblock level. Version 1.0. [Superseded version]

Ministry of Forests. 2009. Protocol for soil resource stewardship monitoring: cutblock level. Version 5.0. [Current version as of March 2023; available from: https://www2.gov.bc.ca/assets/gov/farming-natural-resources-and-industry/forestry/frep/frep-docs/indicators-soils-protocol.pdf]

Rollerson, T.P. (n.d.) Windthrow study, Queen Charlotte Woodlands Division. Prepared for: Queen Charlotte Woodlands Division. Land Use Planning Advisory Team, Woodland Services, Macmillan Bloedel Limited, Nanaimo, BC.

Sanborn, P. 1991. An evaluation of soil conservation under three tillage systems for the Peace River region of British Columbia: soil physical properties. ARDSA Project 23011. Submitted to: Agriculture Canada, Vancouver, B.C. [Unpublished report; cited by: van Vliet, L. J. P., Kline, R. and Hall, J. W. 1993. Effects of three tillage treatments on seasonal runoff and soil loss in the Peace River region. Can. J. Soil Sci. 73: 469-480. https://cdnsciencepub.com/doi/abs/10.4141/cjss93-048 ]

Schwab, J.W. 1993. Interim terrain and slope stability mapping standards, Prince Rupert Forest Region. B.C. Forest Service, Prince Rupert Forest Region.

Thompson, S. 1991. Provincial soil disturbance summary: 1989-1990 results. Prepared for: B.C. Ministry of Forests, Forest Site Degradation and Rehabilitation Committee. Frontline Forest Research, Nelson, B.C.

Thompson, S. 1999. Evaluation of surface erosion on forest roads: a summary of 1st year sampling results. Submitted to Peter Jordan, Ministry of Forests, Nelson Forest Region. January 1999.

Thompson, S.R., P.M. Osberg. 1992. Soil disturbance after logging in British Columbia, 1991 results. Prepared for: Ministry of Forests, Research Branch, May 1992.

Watt, B. (n.d.) Soil disturbance after logging on 11 sites in the Cariboo Forest Region, 1993. Prepared for: Timber Section, Cariboo Forest Region.

File consists of guidebooks for trips – both in Canada and international – that Paul Sanborn attended. Also includes guidebooks that were given to him by colleagues. Most of these guidebooks relate to soil science, but some deal with Quaternary and bedrock geology.

Includes the following items:

4th International Workshop on Disturbance Dynamics in the Boreal Forest. 2002. A Naturally Disturbing Tour of the Central Interior of British Columbia. August 12, 2002.

18th Biennial Meeting of the American Quaternary Association. 2004. Guidebook for Field Trips. Compiled by Rolfe D. Mandel. June 25, 28-30, 2004.

19th World Congress of Soil Science. 2010. Excursion 2: Brisbane Bayside, 1 August 2010.

19th World Congress of Soil Science. 2010. New Zealand “Volcanoes to Ocean”, Pre-Conference North Island Guidebook, 26th – 30th July 2010.

ASA-CSSA-SSSA International Annual Meeting. 2011. SSSA Soils-Geomorphology Field Tour: Blackland Prairies, Edwards Plateau, and Texas Central Basin. October 20-21, 2011.

Canadian Geophysical Union. 2002. Rocky Mountain highlights and dirt: C.G.U. Field Trip. May 18, 2002. Prepared by: C. Henderson.

Canadian Geophysical Union. 2006. The Burgess Shale and Rocky Mountain Highlights: C.G.U. Field Trip. May 14, 2006. Compiled by C.J. Collom.

Canadian Society of Soil Science. 2014. Soils and Landscapes of the Front Ranges, Foothills, and Great Plains: Field Guide. Compiled by Dan and Lea Pennock. May 2014.

Friends of the Pleistocene – Rocky Mountain Cell. 1995. Late Pleistocene – Holocene Evolution of the Northeastern Yellowstone Landscape: Field conference guidebook. August 25-27, 1995. Compiled by Grant A. Meyer.

Froese, D., P. Matheus, and J. Rasic. 2003. Beringian environments and heritage of the Upper Yukon River: A field workshop from Dawson City, Yukon through Yukon Charley Rivers National Preserve, Alaska. May 30-June 3, 2003. [associated with International Mammoth Conference, Dawson]

Froese, D., R. Woywitka, L. Andriashek, D. Smith, and N. Atkinson. 2013. Field trip guide to the Quaternary geology and geoarchaeology of the Oil Sands region, NE Alberta: August 22-25, 2013. Canadian Quaternary Association.

Geological Association of Canada / Mineralogical Association of Canada. 2016. Veins to Valleys: the Klondike District. Field trip leaders: Jim Mortensen, Jeffrey Bond, Peter Tallman, Grant Zazula. May 28-31, 2016.

Luttmerding, H.A. 1992. Vertisolic soils field tour, British Columbia portion. August 19-23, 1992. BC Ministry of Environment, Lands and Parks.

Morison, S.R., C.A.S. Smith. 1987. XIIth INQUA Congress Field Excursions A20a and A20b: Research in Yukon. National Research Council of Canada, Ottawa.

Northwest Forest Soils Council Field Trip. 2001. Boreal Forest Soils in a Changing Climate. July 9-11, 2001. Fairbanks, Alaska.
Tarnocai, C., C.A.S. Smith, and C.A. Fox. 1993. International Tour of Permafrost Affected Soils: the Yukon and Northwest Territories of Canada. Research Branch, Agriculture Canada, Ottawa. https://sis.agr.gc.ca/cansis/publications/surveys/yt/ytps/ytps_report.pdf

Sanborn, P. 1995. Watershed Restoration in the Olympic National Forest, Hood Canal Ranger District, Washington. September 17-18, 1995. International Conference of Society for Ecological Restoration.

File consists of proceedings and abstracts for conferences and workshops attended by Paul Sanborn.

Includes the following items:

Alloway, B.V., D.G. Froese, and J.A. Westgate (eds.) 2005. Proceedings of the International Field Conference and Workshop on Tephrochronology & Volcanism: Dawson City, Yukon Territory, Canada, July 31st – August 8th, 2005.

BC Forestry Continuing Studies Network. 1994. Workshop proceedings: Grasses and legumes in forestry - A forum for discussing the economic and ecological costs and benefits of using grass and legume species in all phases of northern forest management. Prince George, BC: April 6-7, 1994.

Canadian Quaternary Association. 2001. Canadian Quaternary Association Meetings, 2001: Program and Abstracts. Occasional Paper in Earth Sciences No. 1. Heritage Branch, Government of the Yukon. http://emrlibrary.gov.yk.ca/Tourism/canadian-quaternary-association-meetings-program-and-abstracts-2001.pdf

Enhanced Forest Management Pilot Project. 2000. Proceedings of the March 30-31 Information Session. Robson Valley Forest District. [9 extended abstracts & full articles]

Society for Ecological Restoration. 1995. Taking a broader view: 1995 international conference. September 14-16, 1995. University of Washington, Seattle WA, USA. [program & abstracts]

File consists of reports and documents relating to resource inventory.

Includes the following items:

E.L.U.C. Secretariat. 1976. Terrain classification system (May 1976; 2nd printing). [Original version, as adapted from work by R. Fulton, Geological Survey of Canada. Version 2 was updated in 1988 & reprinted 1997]

Jones, C. (compiler). 1997. Predictive ecosystem mapping (PEM) workshop, Prince Rupert Forest Region, April 25, 1997, Minutes.
Jones, K. et al. 1999. Towards the establishment of predictive ecosystem mapping standards: a white paper. 1st approximation. March, 1999. Prepared for: Terrestrial Ecosystem Mapping Alternatives Task Force, Resources Inventory Committee.

Kistritz, R.U. and G.L. Porter. 1993. Proposed wetland classification system for British Columbia: a discussion paper. Prepared for: B.C. Ministry of Forests, Ministry of Environment, Lands and Parks, B.C. Conservation Data Centre.

Louie, R.H. 1992. Soil surveys in British Columbia, 1928-1992: a listing of soil survey reports and maps for the Province of British Columbia. Soil Conservation Service, Integrated Management Branch, Ministry of Environment, Lands and Parks, Victoria.

Maxwell, R. and T. Lea. 1993. Bioterrain mapping guidelines: a supplement to the ecological mapping methodology (September 1993) (Working Document; First Draft). Habitat Inventory Section, Wildlife Branch, Ministry of Environment, Victoria.

Maxwell, R. and T. Lea. 1993. Soils data collection for ecological mapping – the next twenty years. [Presented at: B.C. Soil Science Workshop 1993?]

Meidinger, D. 2000. Protocol for quality assurance and accuracy assessment of ecosystem maps. July, 2000. Prepared for: TEM Alternatives Task Force. Research Branch, Ministry of Forests, Victoria. [Draft version; later revision (2003) issued as Technical Report 011, Forest Science Program, Ministry of Forests. https://www.for.gov.bc.ca/hfd/pubs/docs/Tr/Tr011.pdf ]

File consists of reports and documents relating to British Columbia grasslands.

Includes the following items:

B.A. Blackwell & Associates Ltd. 2007. Cariboo-Chilcotin ecosystem restoration plan: grassland benchmark.

Cariboo-Chilcotin Grasslands Strategy Working Group. 2001. Cariboo-Chilcotin grasslands strategy: forest encroachment onto grasslands and establishment of a grassland benchmark area. Prepared for Cariboo-Mid Coast Interagency Management Committee.

Grasslands Conservation Council of British Columbia. 2003. Changes in the grassland-forest interface: A BC grasslands conservation risk assessment communication tool.

Ross, T.J. 2008. Becher Prairie range unit ecosystem restoration strategic plan. Prepared for British Columbia Ministry of Forests and Range Central Cariboo Forest District.

File consists of miscellaneous reports relating to forests and silviculture.

Series consists of records created and collected in relation to research projects Dr. Paul Sanborn was engaged in, often with other colleagues, during his employment with the BC Ministry of Forests and/or the University of Northern British Columbia. These archival research records are predominantly unpublished documents, reports, data, and photographs. Some of Sanborn's research projects did not result in a formal scientific publication. In other instances, some of Sanborn's research projects resulted in only a portion of the collected data utilized for a formal publication.

Sanborn compiled details about each research project and its associated records in a summary note. Each of these notes is provided in PDF format along with its research project series. These notes serve as an essential guide for researchers who wish to interpret, utilize, and repurpose Sanborn's data for other future research projects.

During a year away from studies in 1987-88, Dr. Paul Sanborn developed a successful grant proposal to the Science Council of BC (SCBC) to pursue a postdoctoral project with Dr. Tim Ballard in relation to sulphur-deficient soils in BC and prescribed fire. This project built on an existing broadcast burning study conducted by Macmillan Bloedel Ltd. near Port Alberni on Vancouver Island, led by Bill Beese (later at Vancouver Island University). Dr. Sanborn's work addressed sulphur forms and amounts in the soils at these sites, and the chemical processes influencing sulphur availability in relation to prescribed fire.

Only one part of this work was eventually published:
Sanborn, P.T. and T.M. Ballard. 1991. Combustion losses of sulphur from conifer foliage: Implications of chemical form and soil nitrogen status. Biogeochemistry 12: 129–134. https://doi.org/10.1007/BF00001810

The remainder of the work was documented in the Project Completion Report to SCBC, dated February 28, 1990.

Thirty-four of the accompanying project data files were selected for archival retention.

During Dr. Sanborn's years with the Ministry of Forests research program (1991-2002), he worked on forest fertilization research with silviculturist Rob Brockley (retired; formerly at Kalamalka Research Station, Vernon, BC). Brockley’s work in the 1980s and early 1990s had documented the widespread pattern of sulphur deficiencies across the BC interior, and the superior response of managed stands to fertilization treatments involving sulphur (S) and nitrogen (N) rather than nitrogen alone.

To progress farther, different methods for understanding the fate of sulphur fertilizers in forests and soils were needed. Sanborn contacted the stable isotope group at the University of Calgary which had done important work on the fate of pollutant sulphur emitted by oil and gas extraction and processing in Alberta, using natural abundances of sulphur stable isotopes as a tracer. This was the beginning of a collaboration with Dr. Bernhard Mayer of the University of Calgary, and also with his German soil scientist colleague, Dr. Joerg Prietzel (Munich Technical University).

The research team engaged in the Cluculz retrospective study (E.P. 886.10) for the BC Ministry of Forests.

An ancillary project involved resampling (2002 - foliage, 2003 - soil) of a previously fertilized (1990) installation (E.P. 886.10) south of Cluculz Lake in order to compare the longer-term effects of different fertilizer sulphur forms on soil and foliage chemical properties. Results were published as a journal article and a Ministry of Forests Extension Note:

Sanborn, P.T., J. Prietzel, R.P. Brockley. 2005. Soil and lodgepole pine foliar responses to two fertilizer sulphur forms in the Sub-Boreal Spruce zone, central interior British Columbia. Can. J. For. Res. 35 (10): 2316-2322. https://cdnsciencepub.com/doi/abs/10.1139/x05-138

Sanborn, P. and R. Brockley. 2005. Sulphur deficiencies in lodgepole pine: occurrence, diagnosis, and treatment. Ext. Note 71. B.C. Min. For., Res. Br., Victoria, B.C. https://www.for.gov.bc.ca/hfd/pubs/docs/en/En71.pdf

The Sulphur stable isotope tracer study (E.P. 886.15) field experiment was installed in young lodgepole pine stands at two sites in the Prince George Forest Region in 2001, with fertilizer treatments applied in late 2002. These sites are designated as Kenneth Creek (east of Prince George) and Holy Cross (south of Fraser Lake). (The Kenneth Creek installation was established near plots of the older E.P. 886.13 in the same stand.) Full experimental details, including pretreatment soil and foliar date, were given in:

Sanborn, P., R.P. Brockley, B. Mayer, M. Yun, J. Prietzel. 2005. Sulphur fertilization of lodgepole pine: a stable isotope tracer study (E.P. 886.15): Establishment report. Tech. Rep. 020. B.C. Min. For., Res. Br., Victoria, BC. http://www.for.gov.bc.ca/hfd/pubs/Docs/Tr/Tr020.htm

The Kenneth Creek site was attacked by mountain pine beetle in 2006, resulting in at least 80% tree mortality. In 2013, the stand was levelled in order to enable replanting, and due to poor communications within the Ministry of Forests, the opportunity to salvage this installation was lost. The Holy Cross site was hit by a wildfire in 2010, and most of the research plots were destroyed.

Preliminary results from foliar analysis, sufficient to demonstrate that our stable isotope tracer approach could detect fertilizer uptake, were published in:

Sanborn, P.T., R.P. Brockley, and B. Mayer. 2011. Stable isotope tracing of fertilizer uptake by lodgepole pine: foliar responses. Can. J. For. Res. 41: 493-500. https://cdnsciencepub.com/doi/full/10.1139/X10-222

EP 660 was a conventional silvicultural trial established in 1967 which involved single species plantings of lodgepole pine (Pl), white spruce (Sw), and Douglas-fir (Fd) at different spacings. Three installations were established in the Prince George - Vanderhoof area: Buckhorn Ridge, Bobtail Road, and Chilco Creek.

General details on EP 660 are given by:
Coopersmith, D., M. McLellan, and J. Stork. 1997a. Experimental Project 660 overview of three experimental installations – a 30-year progress report. B.C. Min. For., Prince George For. Reg., Res. Note #PG-12.

Details on the Buckhorn installation are given by:
Coopersmith, D., M. McLellan, and J. Stork. 1997b. Experimental Project 660 30-year progress report: Buckhorn Installation. B.C. Min. For., Prince George For. Reg., Res. Note #PG-12-1.

File contains 8 slides from 2 rolls, taken August 1997:
Roll 1 - Buckhorn Ridge:

• Slide 31 – Fd (2 x 2 m) – stand view
• Slide 32 – Fd (2 x 2 m) – forest floor view
• Slide 33 – Pl (2x 2 m) – stand view
• Slide 34 – Pl (2 x 2 m) – forest floor view
  Roll 2 – Bobtail Road:
• Slide 20 – Pl (2 x 2 m) – east plot, stand view
• Slide 21 – Pl (2 x 2 m) – east plot, stand view
• Slide 22 – Fd (2 x 2 m) – east plot, stand view
• Slide 23 – Sw (2 x 2 m) – stand view

The Archie Creek site is the informal name used for a research installation established in 1971 east of Prince George by the Canadian Forest Service, and subsequently abandoned by the end of that decade. Dr. Paul Sanborn revisited the site in 1995, and sampled forest floors and mineral soils across a range of conifer-broadleaf mixtures established by natural establishment of broadleaf trees among planted lodgepole pines.

Details of the site conditions, sampling methods, and results were published in:
Sanborn, P. 2001. Influence of broadleaf trees on soil chemical properties: A retrospective study in the Sub-Boreal Spruce Zone, British Columbia, Canada. Plant and Soil 236: 75–82. https://doi.org/10.1023/A:1011973402414

This map depicts the location of the Archie Creek site, annotated on a photocopied 93I.011 BC government map (undated).

This unpublished 1993 UBC undergraduate thesis by J. Hickling entitled "Some long term effects of scarification on soil properties and site productivity" includes some soils data from the Archie Creek site.

This document is an unpublished 1995 UNBC co-op work term report by B. Roosdahl entitled "Forest Floor Development on Bladed Trails in the SBS: A retrospective study of the Archie Creek site". B. Roosdahl was a co-op student who was one of the student research assistants involved in the field work at the Archie Creek site in fall 1995.

File contains 2 rolls (51 slides) taken September 25-26, 1995 that depict paired views of plot vegetation and forest floor surface. Handwritten number notations on slide frames indicate plot numbers from the original research installation.

The BC Ministry of Forest's EP 1148 Long-term Soil Productivity (LTSP) study addresses two key factors— soil porosity and site organic matter—that potentially limit tree growth and site productivity in the timber-harvesting land base and that can be affected by forestry operations.