. Regeneration in mixed conifer shelterwood cuttings in the Cascade Range of eastern Oregon. Conifers; Forest regeneration Oregon; Forest regeneration Cascade Range. Planted trees were identfied from information on species planted, date of planting, and spacing. In shelterwoods where survival was high, regular rows of planted trees were clearly visi- ble. Identification of planted trees was less certain when survival was low, but counting whorls to check the age of a tree helped in determining planted trees. The following environmental factors associated with each 1-milacre subplot were observ
. Regeneration in mixed conifer shelterwood cuttings in the Cascade Range of eastern Oregon. Conifers; Forest regeneration Oregon; Forest regeneration Cascade Range. Planted trees were identfied from information on species planted, date of planting, and spacing. In shelterwoods where survival was high, regular rows of planted trees were clearly visi- ble. Identification of planted trees was less certain when survival was low, but counting whorls to check the age of a tree helped in determining planted trees. The following environmental factors associated with each 1-milacre subplot were observed and recorded:!.' Aspect, slope, condition of the seed bed (mineral soil, litter, slash), degree of burn, understory vegetation (forbs, shrubs, grasses), residual overstory density (basal area and percent crown closure), and presence or absence of animal damage. Data Analysis To illustrate the present status of reforestation, I summarized data in tables showing seedling numbers and stocking percentage of milacre subplots by species and origin for the plant communities. To determine the relationship be- tween regeneration and environ- mental variables, I used stepwise multiple regression procedures to fit linear equations of the form Y=b0+b1X1+b2X2+...bnXn to the data. Dependent (Y) variables used were stocking percentages of —^ See appendix for details of pro- cedures for measuring and coding the environmental factors. milacre subplots and number of seedlings per acre of the various species and origins, and the independent (X) variables were the environmental factors given in the appendix?./. RESULTS AND DISCUSSION Regeneration Stocking and Density Regeneration on shelterwood units in both the mountain hemlock/grouse huckleberry and the mixed conifer/snowbrush-chinkapin communities was excellent for all species established before and after logging (fig. 3). An aver- age of 63 percent of the milacre. Figure regeneration in a mixed conifer shelterwood unit. Seedli
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectconifers
