Browsing by Author "Edgar, Christopher B."
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Item Cost-effective Forest Inventory Designs: Field Data Collection(University of Minnesota Department of Forest Resources, 2018-02) Ek, Alan R.; Wilson, David C.; Edgar, Christopher B.; Zobel, John M.Item Determination of forest type and stand size class across FIA inventory years(University of Minnesota Department of Forest Resources, 2019-11) Zobel, John M.; Ek, Alan R.; Edgar, Christopher B.Item Old Forest Extent and Changes in Minnesota 2003-2018(University of Minnesota Department of Forest Resources, 2021-03) Peters, Emily B.; Wilson, David C.; Edgar, Christopher B.; Ek, Alan R.Old forests are an important part of Minnesota’s landscape. Here we describe the extent and recent changes in the acreage of old forest in Minnesota by forest type. Statewide, the area of old forest increased from 3.8% of the total forest area in 2003 to 6.4% in 2018. The area of old forest increased for most forest types and across all major ownership categories, but there are exceptions, notably for forest types that occupy relatively small acreages, are actively managed for timber products, or have forest health issues.Item Stand Inventories as an Early Detection System for Forest Health Threats(Forest Science, 2023) Klockow, Paul A.; Edgar, Christopher B.; Windmuller-Campione, Marcella A.; Baker, Fred A.Pest-specific inventories require substantial resources and are often infeasible, creating a need for alternative means of early pest detection. We examined the potential for stand inventories to detect forest health threats by using a unique dataset of mapped eastern spruce dwarf mistletoe (Arceuthobium pusillum Peck.) infestations in black spruce (Picea mariana Mill. B.S.P) stands of northern Minnesota, USA. We simulated stand inventories across a range of sampling intensities; that is, current standard (S) methods in Minnesota, adding one plot (S + 1), doubling the intensity (2S), and halving the intensity (S/2), using fixed-radius plots and transect buffers for detection. We categorized stands into low, moderate, and high infestation severity. We simulated detection at multiple viewing distances along S inventory transects in low severity infestation stands. Detection probability increased as sampling intensity increased. Plot-based detection averaged > 50% for moderate and high severity infestations except S/2 in moderate severity infestations. Notably, transect-based detection averaged ≥ 85% at viewing distances of 25 to 100 m. Results suggest stand inventories could provide opportunities to detect forest health threats with unique signatures when transect observations are included. Thus, forest health specialists may consider including pest-specific training for foresters in current inventory methods, requiring modest investment of time and effort.