LEMMA Team Detail
 | Harold Zald Research Ecologist Dept. of Forest Ecosystems and Society Oregon State University | Mailing address: Department of Forest Ecosystems & Society Phone:Oregon State University 321 Richardson Hall Corvallis, OR 97331 (541) 760-7969 Email: |
Educational Background
B.S., 1997 (resource ecology and management) University of Michigan, Ann Arbor, MI
M.S., 2002 (resource ecology and management) University of Michigan, Ann Arbor, MI
Ph.D., 2010 (forest ecology) Oregon State University, Corvallis, OR
Research Interests
Multi-scale controls of treeline movement and tree invasion in complex terrain; integrating field vegetation surveys with remotely sensed data; ecology, management, and restoration of ecosystems sensitive to climate change and alterations to their historical disturbance regimes; Biotic and abiotic influences on drought stress in trees; quantifying rates, spatial patterns, and causes of land cover change at multiple spatial scales.
Biography
Harold has been a postdoctoral researcher working with the LEMMA team since 2011. He is focused on integrating high resolution light detection and ranging (lidar) data into GNN models, and evaluating the influence of lidar and input data grain size on GNN model accuracy. His Ph.D. research focused on combining dendrochronology techniques (tree-rings), remotely sensed data, and historical climate to reconstruct spatiotemporal patterns past tree invasion into subalpine meadows in the Oregon Cascades. From 2002 to 2005, Harold was a research ecologist with the PNW Research Station, studying the impacts of prescribed fire and thinning on regeneration of mixed-conifer forests in the Sierra Nevada. When not working, Harold enjoys backpacking, hiking, fishing, gardening, beekeeping, and fermentation sciences.
Refereed Publications
 | Zald, HSJ. 2009. Extent and spatial patterns of grass bald land cover change (1948-2000), Oregon Coast Range, USA. Plant Ecology 201:517-529. |
| Zald, HSJ, AN Gray, M North, RA Kern. 2008. Initial tree regeneration responses to fire and thinning treatments in a Sierra Nevada mixed-conifer forest, USA. Forest Ecology and Management 256:168-179. |
| Hurteau, M, HSJ Zald, M North. 2007. Species-specific response to climate reconstruction in upper-elevation mixed-conifer forests of the western Sierra Nevada, California, USA. Canadian Journal of Forest Research 37:1681-1691. |
| Meyer, MD, M North, AN Gray, HSJ Zald. 2007. Influence of soil thickness on stand characteristics in a Sierra Nevada mixed-conifer forest. Plant Soil 294:113-123. |
| North, M, J Innes, HSJ Zald. 2007. Comparison of thinning and prescribed fire restoration treatments to Sierran mixed-conifer historic conditions. Canadian Journal of Forest Research 37:331-342. |
| Gray, AN, HSJ Zald, RA Kern, M North. 2005. Stand conditions associated with tree regeneration in Sierran mixed-conifer forests. Forest Science 51:198-210. |
| Wilmking, M, GP Juday, VA Barber, HSJ Zald. 2004. Recent climate warming forces contrasting growth responses of white spruce at treeline in Alaska through temperature thresholds. Global Change Biology 10:1724-1736. |
Technical Reports
| Zald, HSJ. 2002. Physiographic and reproductive components of treeline response to climatic variation in the Alaska Range. Global Glimpses: Center for Global Change & Arctic System Research 10(1): 7-9. |
Other Non-Refereed Publications
| Zald, HSJ. 2010. Tree invasion of subalpine parkland at Jefferson Park: Multi-scale controls of a complex landscape. Northwest Oregon Ecology Group Newsletter 9:7. |
Presentations
 | Gregory, MJ, JL Ohmann, HM Roberts, HSJ Zald, EB Henderson. 2013. Recent advances and applications of nearest neighbors methods for regional-scale forest vegetation mapping in the Pacific Northwest, USA. Landcare Research Seminar: Lincoln, New Zealand; February 2013. |
| Zald, HSJ, JL Ohmann, HM Roberts, M Gregory, EB Henderson, R McGaughey, RE Kennedy, J Braaten, M Simpson. 2013. Incorporating LiDAR and Landsat disturbance history into nearest neighbor mapping of vegetation composition and structure. USFS Region 6 office for Monitoring Inventory Mapping and LiDAR (MIML) working group: Portland, OR; February 2013. |
| Henderson, EB, JL Ohmann, MJ Gregory, HM Roberts, HSJ Zald. 2012. All for one or one for all? Mapping many species individually versus simultaneously with random forest. Ecological Society of America Annual Conference: Portland, OR; August 2012. |
| Zald, HSJ. 2011. Tree Cores, and Snow: Modeling fine-scale tree invasion into a subalpine meadow landscape under future snow scenarios, Oregon Cascades, USA. US Regional Association of the International Association of Landscape Ecology Annual Meeting: Portland, OR; April 2011. |
| Zald, HSJ. 2010. Measuring and mapping impacts of climate change and disturbance on forest ecosystems. Department of Biology, Grand Valley State University: Allendale, MI; November 2010. |
| Zald, HSJ. 2010. Climate change and disturbances in western forest ecosystems: Impacts and management. Division of Forestry and Natural Resources, West Virginia University: Morgantown, WV; September 2010. |
| Zald, HSJ. 2010. Multiscale climatic, topographic, and biotic controls of tree invasion in a subalpine parkland landscape, Jefferson Park, Oregon Cascades, USA. H.J. Andrews Experimental Forest, MTNCLIM 2010: Blue River, OR; June 2010. |
| Zald, HSJ. 2010. Climate Change and forests of the Pacific Northwest: Potential impacts and management considerations. Biology Department, Linfield College: McMinnville, OR; May 2010. |
| Zald, HSJ, AN Gray, M Huso, D Gatziolis. 2009. Seedling establishment in a subalpine parkland landscape: topographic, seed source, climatic, and disturbance controls. Ecological Society of America, 94th Annual Meeting: Albuquerque, NM; August 2009. | |
| Zald, HSJ. 2008. Extent and spatial patterns of grass bald land cover change (1948-2000), Oregon Coast Range, USA. Oregon State University, Department of Forest Science 2nd Annual Graduate Student Symposium: Corvallis, OR; May 2008. |
| Zald, HSJ, AN Gray, M North, RA Kern. 2007. Tree regeneration responses to fire and thinning in a Sierran mixed conifer forest. Oregon State University, Department of Forest Science 1st Annual Graduate Student Symposium: Corvallis, OR; May 2007. |
| Zald, HSJ, AN Gray. 2004. Tree regeneration strategies in response to burning and thinning restoration treatments in a Sierran mixed-conifer forest. Ecological Society of America, 89th Annual Meeting: Portland, OR; August 2004. |
| Zald, HSJ. 2002. Influence of physiographic and climatic variation on treeline dynamics in the eastern Alaska Range. Michigan Academy of Arts Science and Letters Annual Meeting, Central Michigan University: Mount Pleasant, MI; March 2002. |
Posters
| Zald, HSJ, JL Ohmann, HM Roberts, R McGaughey, MJ Gregory, RE Kennedy. 2012. Influence of inventory plot and Landsat imagery positional accuracies on nearest-neighbor (NN) imputation maps of vegetation composition and structure. ForestSat 2012: Corvallis, OR; September 2012. |
| Zald, HSJ, TA Spies, D Gatziolis. 2009. Seedling establishment in a subalpine parkland landscape: topographic, seed source, climatic, and disturbance controls. H.J. Andrews Experimental Forest Long-Term Ecological Research, 10th Annual Symposium: Corvallis, OR; April 2009. |
| Zald, HSJ, AN Gray, M North. 2005. Tree regeneration in response to prescribed fire, silvicultural thinning, and microsite conditions in a Sierran mixed conifer forest. Northwest Science Association Annual Meeting: Corvallis, OR; March 2005. |
| Gray, AN, HSJ Zald, M North. 2002. Soil moisture and tree seedling distributions in a mature mixed-conifer forest. Sierra Nevada Science Symposium: Kings Beach, CA; October 2002. |