Accuracy of Regeneration Surveys in New England Northern Hardwoods.
Authors:
Leak, W.B. USDA, FS
Source:
Northern journal of applied forestry. 2007 Sept., v. 24, no. 3, p. 227-229.
NALT Subjects:
forest regeneration forest surveys accuracy deciduous forests hardwood forest stands species diversity stand composition forest trees tree and stand measurements seedlings stand management planning forest growth understory shade tolerance New Hampshire
Issue Date:
Sep-2007
Abstract:
Four 5-ac demonstration harvests were initiated in 1951 on the Bartlett Experimental Forest, New Hampshire: light selection, moderate selection, diameter limit, and liquidation. In 1952 and 1959, regeneration surveys were conducted that measured several different attributes of the seedlings and saplings in the cutover stands. In 2005, the stands were remeasured to determine the relationships of the various regeneration measures to current species composition of the pole-timber portion of the stands. Although predictions were somewhat variable and imperfect, the best measures for shade-tolerant species were those that took account of the sapling layer, and measures based on the dominant stem per small plot were best for less-tolerant species. Combining both attributes, these results suggest that the best approach would be a small-plot survey (milacre or slightly larger) that simply records the dominant stem per plot including stems up through the sapling size classes (less than 4.5-in. dbh). This could be taken before harvest, to predict the effects of a light partial cut, or 5-7 years after harvest, to predict future species composition after any harvest intensity.
