Timber Resource Statistics for Eastern Washington
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EDITORS FILE COPY Agriculture Timber Resource Forest Setvice Pacific Northwest Forest and Range Statistics for Eastern Experiment Station Resource Bulletin PNW-104 washington September 1983 Patricia M. Bassett and Daniel D. Oswald Authors PATRICIA M. BASSEll is a computer programer analyst and DANIEL D. OSWALD is a resource analyst at the Pacific Northwest Forest and Range Experiment Station, P.O. Box 3890, Portland, Oregon 97208. Abstract Summary Preface Bassett, Patricia M.; Oswald, Daniel D. The eastern Washington resource area Forest Inventory and Analysis (formerly Timber resource statistics for eastern totals 26,966,000 acres (10 913 000 ha), Forest Survey) is a nationwide project of Washington. Resour. Bull. PNW-104. of which an estimated 9,216,000 acres the USDA Forest Service authorized by Portland, OR: U.S. Department of (3 730 000 ha) are forested. An estimated the Forest and Rangeland Renewable Agriculture, Forest Service, Pacific 7,145,000 acres (2 891 000 ha) are Resources Research Act of 1978. Work Northwest Forest and Range Experi- classified as timberland. The area has an units of the project, located at Forest ment Station; 1983.32 p. estimated 17.3 billion cubic feet Service Experiment Stations, conduct (491 million m3) of standing timber with forest resource inventories throughout This report summarizes a 1980 timber 72 percent of this volume in public the 50 States. The Pacific Northwest resource inventory of the 16 forested ownership. Forest and Range Experiment Station at counties in Washington east of the crest Portland, Oregon, is responsible for of the Cascade Range. Detailed tables of inventories in Alaska, California, Hawaii, forest area, timber volume, growth, Oregon, and Washington. mortality, and harvest are presented. KEYWORDS: Forest surveys, statistics (forest), timber resources, resources (forest), Washington (eastern). Contents Tables 4 Map of the Eastern Washington Table 1-Area by county and land class, eastern Washington, January 1,1981 Area Table 2-Area of timberland by county and ownership class, eastern Washington, 5 Introduction January 1,1981 5 Inventory Procedures Table &Area of timberland by cubic-foot site and ownership classes, eastern 6 Reliability of Inventory Data Washington, January 1,1981 7 Terminology Table &Area of timberland by stand size and ownership classes, eastern 10 Names of Trees Washington, January 1,1981 11 Tables Table 5--Area of timberland by forest type and ownership class, eastern Washington, 32 Acknowledgments January 1,1981 32 Metric Equivalents Table &Area of reserved and deferred timberland and other forest land by land class, 32 Literature Cited forest type, and ownership class, eastern Washington, January 1, 1981 Table 7-Volume of timber on timberland by class of timber and by softwoods and hardwoods, eastern Washington, January 1, 1981 Table &Volume of growing stock and sawtimber on timberland by ownership class and by softwoods and hardwaods, eastern Washington, January 1,1981 Table 9--Volume of growing stock and sawtimber on timberland by county and ownership class, eastern Washington, January 1,1981 Table 10-Volume of growing stock on timberland by species and ownership class, eastern Washington, January 1,1981 Table 11-Volume of sawtimber, International 1/4-inchrule, on timberland by species and ownership class, eastern Washington, January 1,1981 Table 12Volume of sawtimber, Scribner rule, on timberland by species and ownership class, eastern Washington, January 1,1981 Table 13-Volume of growing stock on timberland by species and diameter class, eastern Washington, January 1,1981 Table 14-Volume of sawtimber, International 114-inch rule, on timberland by species and diameter class, eastern Washington, January 1,1981 Table 15--Volume of sawtimber, Scribner rule, on timberland by species and diameter class, eastern Washington, January 1,1981 Table 1GNetannual growth of growing stock and sawtimber on timberland by ownership class and by softwoods and hardwoods, eastern Washington, 1980 Table 17-Net annual growth on growing stock on timberland by species and ownership class, eastern Washington, 1980 Table 18-~et'annual growth of sawtimber on timberland by species and ownership class, eastern Washington, 1980 Table 19--Average annual mortality of growing stock on timberland by species and ownership class, eastern Washington, 1980 Table 20-Average annual mortality of sawtimber on timberland by species and ownership class, eastern Washington, 1980 Table 21-Timber harvest by ownership class, eastern Washington, 1950-81 Map of the eastern Washington area OII] Indian Reservations State Other Federal 0Private Introduction lnventory Procedures This report presents statistics from the This report combines inventory data from During the 1967-68 inventory, a 10-point latest inventory of timber resources for five National Forests with an inventory of plot cluster was established at each the 16 forested counties in Washington State, county, municipal, Indian trust, and timberland field location. For the 1980 east of the crest of the Cascade Range. private forest lands conducted by FIA in inventory, a 5-point subset of the original The eastern Washington area was first the summer and fall of 1980. cluster was checked to account for losses inventoried in 1935, with subsequent from harvest or mortality. On one-third of inventories in 1953-61 and 1967-68. The Inventory procedures used on National these timberland plots, the subset was five northeastern-most counties were Forests vary somewhat from forest to also remeasured to account for growth in also inventorigd in 1947. Although the forest. Readers desiring detailed informa- height and diameter of trees surviving current inventory includes all 16 counties, tion for these inventories should contact from the previous inventory. These data for subunits are available on request. the Timber Management staff of the remeasurement data were used to Forest Service Region or National Forest develop equations for predicting height Field data for all lands except National of interest. The general approach used and diameter growth; the equations were Forests were collected in the summer for National Forest inventories in eastern then used to predict current heights and and fall of 1980 by the Forest lnventory Washington is described below. diameters for the two-thirds of the timber and Analysis work unit (FIA) of the Pacific inventory plots for which trees were not Northwest Forest and Range Experiment All areas of timberland, other forest land, remeasured. All timberland plots were Station. National Forest inventory data Wilderness 'and other reserved,.nd non- then used to estimate volume, growth, included in this report are for all lands in forest land were mapped by delineation on mortality, and condition of the forest the State administered by the Colville, aerial photos. Timberland areas were stand (MacLean 1980). Kaniksu, Okanogan, Umatilla, and then sampled with field plots, distributed Wenatchee National Forests. The inven- either systematically on a square grid, or The correlation between plot volume tory data were collected by National randomly in mapped areas defined by based on estimated diameters and Forest personnel. Dates of inventories for forest conditions. The field plots, each a heights and plot volume calculated from these five National Forests were: cluster of 10 variable-radius points distri- measu~eddiameters and heights was buted over about 1 acre (0.4 ha), 1/ are r = 0.99. A similar comparison between Forest Year of inventory the basis for estimates of timber volume, estimated and measured growth showed growth, mortality, and area attributes a correlation of r = 0.95. Bias, in both Pacific Northwest Region: such as forest type, site class, and stand cases, was negligible. Colville 1973-74 size class. Okanogan . 1977 Umatilla 1969 For all lands other than National Forest, Wenatchee 1977 the sampling design used was double sampling for stratification (Cochran Northern Region: 1963). Owner group, major land class Kaniksu (timberland, other forest, nonforest), and stand volume class were identified on Scientific names of trees (Little 1978) are 19,147 photo points. A subsample of listed on page 10 of this report. 1,266 points were visited to determine the accuracy of the land classifications. Field plots were established or reestab- lished at all forest land points included in the subsample. At each such plot, trees were measured and tree and area charac- teristics were observed. The Colville and Kaniksu inventories are based on single-point variable-radius plots rather than on 10-point clusters. Reliability of Inventory Data The timberland area of the five National Forests in eastern Washington was determined from mapping and is not subject to sampling error. Estimates of National Forest timber volume and growth are based on sampling and are subject to sampling error. Confidence intervals (68-percentprobability level) for estimated cubic-footvolume and net annual cubic-foot growth are available for three of the five National Forests: National Forest Timberland area Net volume Net annual growth Thousand acres ....... Million cubic feet. ...... Colville 973 2,063 + NA 42.7 +- NA Kaniksu 110 208 + NA 4.9 + NA Okanogan 683 1,493 + 55 10.0 + 0.9 Umatilla 113 354 + 17 5.8 +- 0.4 Wenatchee 1,028 3,027 + 95 33.6 + 1.O All area and volume statistics for forested areas other than National Forest are based on sampling and are subject to sampling error. Confidence intervals (68-percent probability level) for the