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All Trees • Dry weight averages 56 percent of green weight for all species on a statewide basis. The inventories are conducted under the authority of the McSweeney-McNary Forest Research Act of 1 928 and subsequent acts including the Renewable Resources Planning Act of 1 974 and the Renewable Resources Research Act of 1 978. The statistics presented in this report are a summary of data collected on new field plots established during the fourth inventory and on a remeasured subsample of plots established during the previous inventories. The new-plot sample consisted of 602 ground plots randomly selected from 1 8,355 photo points classified by land use and cubic-foot volume class. The remeasured sample consisted of 550 plots from the third survey. A total of 1,152 points was sampled for an average of one plot for every 5,465 acres of land area. Data were collected, processed, and analyzed by the Forest Inventory and Analysis staff. A complete list of available biomass tables is included in this report. These tables are available on microfiche by state, geographic unit (Fig. 1), and county. Other tables or additional information may be developed. For further information, contact the Forest Inventory and Analysis Unit, USDA Forest Service, 100 Matsonford Road, Radnor, PA 19087 (215-975-4074). Methods Traditionally, forest resource data have been collected to describe the forest in terms of its timber production capabilities. Board-foot and cubic-foot measures of volume (Fig. 2) were and are adequate for that purpose. Although timber production is still considered by many to be the primary use of forest land, there are many data users that are also interested in how the resource can be used for energy production, fiberbased products, wildlife, or recreation. Because board-foot and cubic-foot volume estimates do not describe the forest resource broadly enough, biomass estimates have been built into the standard USDA Forest Service inventory procedure (Fig. 2). Definition of Terms Board foot. A unit of lumber measurement 1 foot long, 1 foot wide, and 1 inch thick, or its equivalent. Commercial species. Tree species presently or prospectively suitable for industrial wood products. Excludes species of typically small size, poor form, or inferior quality, such as hawthorn or sumac. Cull tree. A rough tree or a rotten tree. Diameter at breast height (d.b.h.). The diameter outside bark of a standing tree measured at 4-1/2 feet above the ground. Dry weight. The weight of wood and bark, oven-dry basis. It is usually expressed in pounds or tons. Forest land. Land that is at least 10 percent stocked with trees of any size, or that formerly had such tree cover and is not currently developed for a nonforest use. The minimum area for classification of forest land is 1 acre. Forest type. A classification of forest land based on the species that form a plurality of live tree basalarea stocking. Forest-type group. A combination of forest types that share closely associated species or site requirements. The many forest types in Marylan...
Biomass 1 Timber Volume * Ninety percent of Maryland's timberland is privately owned. Biomass * Dry weight tables are available for the first time. * The net green weight of all live trees on timberland is 260.1 million tons or 107.3 tons per acre. Softwoods account for 36.9 million tons or 15.3 tons per acre; hardwoods account for 223.1 million tons or 92 tons per acre. * A little more than 1 67 million tons, or 64 percent of the net green weight of all * Loblolly pine is the top softwood species with 472 million cubic feet or 1 0.5 Growth/Removals * Average annual net growth of growing-stock volume in Maryland is 3.8 percent of the inventory. * Average annual net cubic-foot growth of growing-stock volume exceeded removals on a statewide basis (1 .7:1); however, removals exceeded growth on the Lower Eastern Shore for both softwoods and hardwoods. data helps users interested in more precise local data, but can make comparisons with past county estimates developed by the proration technique uncertain. Definition of Terms Acceptable tree, (a) Live sawtimber trees that do not qualify as preferred trees but are not cull trees, (b) Live poletimber trees that prospectively will not qualify as preferred trees, but are not now or prospectively cull trees. Accretion. The estimated net growth on growingstock trees that were measured during the previous inventory, divided by the number of growing seasons between inventorys. It does not include the growth on trees that were cut during the period, nor those trees that died. Agricultural/herbaceous land. Land with herbaceous plant cover, both grasses and/or forbs, including cropland, pasture land, and natural grass lands. Aquatic edge. An edge condition created when a terrestrial land use abuts a lake, pond, river, stream, or major wetland. Basal area class. A classification of forest land in terms of basal area (cross sectional area of a tree stem at breast height in square feet per acre) of all live trees of ail sizes. Board foot. A unit of lumber measurement 1 foot long, 1 foot wide, and 1 inch thick, or its equivalent. Board-foot stand-volume class. A classification of forest land in terms of net board-foot volume of sawtimber trees per acre. Bog/Marsh/Swamp. Land that has less than 10.0 percent stocking with live trees; and which characteristically supports low, generally herbaceous or shrubby vegetation, and which is intermittently covered with water during all seasons; includes tidal areas that are covered with salty or brackish water during high tides. Browse. Forage resource; defined here as current twig growth of woody-stemmed plants occurring between 1 and 8 feet in height. Cabin log. A relatively slender roundwood product that is cut to standard sizes; meets specifications of strength, straightness, and soundness; and is finished for use in constructing cabins, barns, and other buildings. Coarse residues. Manufacturing residues suitable for chipping, such as slabs, edgings, and veneer cores. Commercial species. Tree species presently or prospectively suitable for i...
Biomass 1 Timber Volume 2 Growth/Removals 2 Highlights * Ninety-six percent of Delaware's timberland is privately owned. Biomass * Dry weight tables are available for the first time. * * Growing-stock volume is 643.9 million cubic feet, an average of 1,711 cubic feet per acre. This is a 10.3 percent increase over the 1972 inventory. * Sawtimber volume is 1 ,787 million board feet, an average of 4,748 board feet per acre. This is a 16.6 percent increase over the 1972 survey. * Although loblolly pine growing-stock volume decreased 1 1 .3 percent between inventories, it remains the number one species. With 143.1 million cubic feet, loblolly pine accounts for over 22.2 percent of the growing-stock volume. Growth/Removals * Annual net growth of growing-stock volume in Delaware is 2.1 percent of the inventory. * Average annual net growth of growing-stock volume for all species exceeded removals on a statewide basis (1.4:1); however, for softwoods, removals exceeded growth by a ratio of 1.1:1. Under the authority of the McSweeny-McNary Forest Research Act of 1928 and subsequent acts, including the Renewable Resources Planning Act of 1 974 and the Renewable Resources Research Act of 1 978, the USDA Forest Service conducts periodic forest inventories of all states to provide up-to-date information on the forest resource of the Nation. The initial inventory of Delaware's resources was conducted in 1956. The second inventory was completed in 1971. This report presents the forest resource data from the third inventory completed in 1 986. This inventory involved a cooperative effort of the
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