Martin Ritchie, PhD

Volunteer

Emeritus Research Forester

Pacific Southwest Research Station

martin.ritchie@usda.gov

Publications & Products
Related
Education

Treesearch Publications

Christopher Looney, Martin Ritchie. 2025. Evaluating the efficacy of thinning and prescribed fire for restoring mature forest characteristics in the Eastern Cascades, USA
Emily G. Brodie, Christopher J. Fettig, Martin Ritchie, Eric E. Knapp, Christopher Looney. 2024. Ecological forestry treatments affect fine-scale attributes within large experimental units to influence tree growth, vigor, and mortality in ponderosa pine/white fir forests in California, U.S.
Emily Brodie, Eric E. Knapp, Wesley R. Brooks, Stacy Drury, Martin Ritchie. 2024. Forest thinning and prescribed burning treatments reduce wildfire severity and buffer the impacts of severe fire weather
Sushil Nepal, Bianca N. I Eskelson, Martin Ritchie, Sarah E. Gergel. 2023. Thinning combined with prescribed burn created spatially heterogeneous overstory structures in contemporary dry forests: A comparison using LiDAR (2016) and field inventory (1934) data
Sushil Nepal, Bianca N.I. Eskelson, Martin Ritchie, Sarah E. Gergel. 2023. Spatial patterns of vigor by stand density across species groups and its drivers in a pre-harvest ponderosa pine-dominated landscape in northern California
Martin Ritchie, John-Pascal Berrill, Ethan Hammett, Jonathan W. Long. 2023. Early responses to crown modification of California black oak sprouts initiated by high-severity wildfire
Cerena J. Brewen, John-Pascal Berrill, Martin Ritchie, Kevin Boston, Christa Dagley, Bobette Jones, Michelle Coppoletta, Coye L. Burnett. 2021. 76-year decline and recovery of aspen mediated by contrasting fire regimes: Long-unburned, infrequent and frequent mixed-severity wildfire
Woongsoon Jang, Martin Ritchie, Jianwei Zhang. 2020. Improved equations for the density management diagram isolines of ponderosa pine stands
Martin Ritchie. 2020. Relating stocking and density for natural regeneration of conifers in northern California
Sushil Nepal, Bianca N.I. Eskelson, Martin Ritchie. 2020. Difference in regeneration conditions in Pinus ponderosa dominated forests in northern California, USA, over an 83 year period
Martin Ritchie. 2020. Effects of thinning and prescribed fire in the Goosenest Adaptive Management Area in northeastern California
Francisco Mauro, Martin Ritchie, Brian M. Wing, Bryce Frank, Vicente Monleon, Hailemariam Temesgen, Andrew T. Hudak. 2019. Estimation of changes of forest structural attributes at three different spatial aggregation levels in Northern California using multitemporal LiDAR
Martin Ritchie, Jianwei Zhang, Ethan Hammett. 2019. Aboveground biomass response to release treatments in a young ponderosa pine plantation
Jianwei Zhang, Kaelyn Finley, Nels G. Johnson, Martin Ritchie. 2019. Lowering stand density enhances resiliency of ponderosa pine forests to disturbances and climate change
Brian M. Wing, Kevin Boston, Martin Ritchie. 2019. A technique for implementing group selection treatments with multiple objectives using an airborne lidar-derived stem map in a heuristic environment
Steve Huff, Krishna P. Poudel, Martin Ritchie, H. Temesgen. 2018. Quantifying aboveground biomass for common shrubs in northeastern California using nonlinear mixed effect models
Martin Ritchie, Jianwei Zhang. 2018. OP-Yield Version 1.00 user's guide
Steve Huff, Martin Ritchie, H. Temesgen. 2017. Allometric equations for estimating aboveground biomass for common shrubs in northeastern California
Ethan Hammett, Martin Ritchie, John-Pascal Berrill. 2017. Resilience of California black oak experiencing frequent fire: regeneration following two large wildfires 12 years apart
Eric E. Knapp, Martin Ritchie. 2016. Response of understory vegetation to salvage logging following a high-severity wildfire
Martin Ritchie. 2016. Multi-scale reference conditions in an interior pine-dominated landscape in northeastern California
Justin S. Crotteau, J. Morgan Varner, John-Pascal Berrill, Martin Ritchie. 2015. Quercus kelloggii (Newb.) sprout response to fire severity in northern California
Brian M. Wing, Martin Ritchie, Kevin Boston, Warren B. Cohen, Michael Olsen. 2015. Individual snag detection using neighborhood attribute filtered airborne lidar data
Justin S. Crotteau, Martin Ritchie. 2014. Long-term stand growth of interior ponderosa pine stands in response to structural modifications and burning treatments in northeastern California
Martin Ritchie, Eric E. Knapp. 2014. Establishment of a long-term fire salvage study in an interior ponderosa pine forest
Martin Ritchie, Carl Skinner. 2014. Interdisciplinary research on the Blacks Mountain Experimental Forest.
Justin S. Crotteau, Martin Ritchie, J. Morgan Varner. 2014. A Mixed-Effects Heterogeneous Negative Binomial Model for Postfire Conifer Regeneration in Northeastern California, USA
Jianwei Zhang, William W. Oliver, Martin Ritchie, Donald L. Neal. 2013. Overstory and understory dynamics in a ponderosa pine plantation vary with stand density in the Sierra Nevada: 40-year results
Jianwei Zhang, Martin Ritchie, Douglas A. Maguire, William W. Oliver. 2013. Thinning ponderosa pine (Pinus ponderosa) stands reduces mortality while maintaining stand productivity
Martin Ritchie, Jianwei Zhang, Todd A. Hamilton. 2013. Aboveground tree biomass for Pinus ponderosa in northeastern California
Martin Ritchie, Eric E. Knapp, Carl N. Skinner. 2013. Snag longevity and surface fuel accumulation following post-fire logging in a ponderosa pine dominated forest
Justin S. Crotteau, Morgan Varner, Martin Ritchie. 2012. Post-fire regeneration across a fire severity gradient in the southern Cascades
Brian M. Wing, Martin Ritchie, Kevin Boston, Warren B. Cohen, Alix Gitelman, Michael Olsen. 2012. Prediction of understory vegetation cover with airborne lidar in an interior ponderosa pine forest
Martin Ritchie, Jianwei Zhang, Todd Hamilton. 2012. Effects of stand density on top height estimation for ponderosa pine
Nicholas R. Vaughn, Eric C. Turnblom, Martin Ritchie. 2010. Bootstrap evaluation of a young Douglas-fir height growth model for the Pacific Northwest
Phil McDonald, Gary Fiddler, Martin Ritchie, Paula Anderson. 2009. Naturally seeded versus planted ponderosa pine seedlings in group-selection openings
Gail Wells, Deborah Hayes, Katrina M. Krause, Ann Bartuska, Susan LeVan, James R. Anderson, Tivoli Gough, Mary Beth Adams, Thomas M. Schuler, Randy Kolka, Steve Sebestyen, Laura S. Kenefic, John Brissette, Susan L. Stout, Keith Kanoti, Fred Swanson, Sarah Greene, Margaret Herring, Martin Ritchie, Carl Skinner, Tom Lisle, Elizabeth Keppeler, Leslie M. Reid, Peter Wohlegemuth, Stanley G. Kitchen, Ward McCaughey, Jim M. Guldin, Don C. Bragg, Michael Shelton, David Loftis, Cathryn Greenberg, Julia Murphy. 2009. Experimental forests and ranges : 100 years of research success stories
Lawrence A. Rabin, William W. Oliver, Robert F. Powers, Martin Ritchie, Matt D. Busse, Eric E. Knapp. 2009. Historical growth plots in the Pacific Southwest
Jianwei Zhang, Martin Ritchie. 2008. Restoring eastside ponderosa pine ecosystems at the Blacks Mountain Experimental Forest: a case study
Martin Ritchie, William W. Oliver, Jianwei Zhang. 2008. Vegetation response to stand structure and prescribed fire in an interior ponderosa pine ecosystem
Martin Ritchie, Brian M. Wing, Todd A. Hamilton. 2008. Stability of the large tree component in treated and untreated late-seral interior ponderosa pine stands
Jianwei Zhang, William W. Oliver, Martin Ritchie. 2007. Effect of stand densities on stand dynamics in white fir (Abies concolor) forests in northeast California, USA
Martin Ritchie, Carl N. Skinner, Todd Hamilton. 2007. Probability of wildfire-induced tree mortality in an interior pine forest of northern California: effects of thinning and prescribed fire
Sussanne Maleki, Carl Featured: Skinner, Martin Ritchie. 2007. Tested by fire: the cone fire and the lessons of an accidental experiment
Nicholas Vaughn, Martin Ritchie. 2005. Estimation of crown cover in interior ponderosa pine stands: Effects of thinning and prescribed fire
Martin Ritchie. 2005. Ecological research at the Goosenest Adaptive Management Area in northeastern California
Martin Ritchie, Kathleen A. Harcksen. 2005. Accelerating development of late-successional features in second-growth pine stands of the Goosenest Adaptive Management Area
Martin Ritchie, Douglas A. Maguire, Andrew Youngblood. 2005. Proceedings of the Symposium on Ponderosa Pine: Issues, Trends, and Management, 2004 October 18-21, Klamath Falls, OR
Martin Ritchie. 1999. A compendium of forest growth and yield simulators for the Pacific coast states
Philip M. McDonald, Martin Ritchie, Celeste S. Abbott. 1996. Ten-year diameter and basal area growth of trees surrounding small group selection openings
Fabian C.C. Uzoh, Martin Ritchie. 1996. Crown area equations for 13 species of trees and shrubs in northern California and southwestern Oregon
Philip M. McDonald, Martin Ritchie. 1994. Epicormic branching of California black oak: effect of stand and tree characteristics
Martin Ritchie, Robert F. Powers. 1993. User's guide for SYSTUM-1 (Version 2.0): A simulator of growth trends in young stands under management in California and Oregon

Citations of Non-Forest Service Publications

Op-Yield Microsoft Excel™ spreadsheet v1.00.4 (5.8 MB)
Standview: an R-package for rendering stand density management diagrams
The standview package is an R-package for rendering a high-resolution-graphic stand density management diagram (DMD). A DMD is a visual aid used by foresters to evaluate stands based on stem density (number of trees per unit area) and either a mean tree size such as quadratic mean diameter, or basal area per unit area. This package was developed to provide flexible development of DMDs for forestry applications. It requires the user to specify the published equations, or to generate their own based on user-supplied metrics.