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Magnolia Fraseri Walt. Fraser Magnolia

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Magnolia Fraseri Walt. Fraser Magnolia Magnolia fraseri Walt. Fraser Magnolia Magnoliaceae Magnolia family Lino Della-Bianca Fraser magnolia (Magnolia fraseri), also called sawtimber and pulpwood, and the fruit is eaten by mountain magnolia, earleaf cucumber-tree, umbrella- wildlife (9,16). tree, or mountain-oread, is a fast-growing small tree scattered in the hardwood forests of the lower Ap- Habitat palachian slopes. It grows best on rich, moist, well- drained soils. The very large showy white flowers Native Range and large coarse foliage make this an attractive or- namental; otherwise it has little commercial value. Restricted mostly to the Appalachians, Fraser The lumber is mixed with associated hardwoods for magnolia (fig. 1) is found in moist habitats in the I I Figure l-The native range of Fraser magnolia. The author is Silviculturist (retired), Southeastern Forest Experi- ment Station, Asheville, NC. 439 Magnolia fraseri mountains of West Virginia, generally in the eastern 0.11 meq/lOO g; nitrous nitrogen, 1.6 p/m; phos- half of the State, in western Virginia, in the southern phorus, 2.0 p/m; and iron, 1.9 p/m; pH 4.8; and or- Appalachians of east Tennessee and western North ganic matter, 6.6 percent (14,20). The nutrient status Carolina, and in the Blue Ridge Mountains of of this soil is low because plentiful soil moisture northwestern South Carolina and northeast Georgia makes nutrients quickly available to all plants, and (12,131. It also grows in the Cumberland Mountains the nutrients are thus tied up until the plants are of southeastern Kentucky. recycled. In the Great Craggy Mountains above Dillingham, Climate NC, at an elevation of 1200 m (3,940 ft) where the northwest slope averages 40 percent, the following Within the natural range of Fraser magnolia average soil values prevail in a stand composed during the growing season, average rainfall varies mostly of sugar maple (Acer saccharum), American considerably. In West Virginia, April to September beech (Fagus grandifolia), yellow buckeye (Aesculus rainfall averages 610 to 760 mm (24 to 30 in), but in octandra), and Carolina basswood (Cilia caroliniana), north Georgia and western North Carolina, it and some Fraser magnolia: pH 4.8, organic matter 7 averages 910 to 990 mm (36 to 39 in) (17). Total percent, bulk density 0.96 g/cm” (59.9 lb/ft3). The top annual precipitation in West Virginia varies from 15 cm (6 in) of mineral soil contained phosphate- 1020 to 1270 mm (40 to 50 in), while in the southern phosphorus 1.7 kg/ha (1.5 lb/acre), potassium 118 Appalachians, the variation is between 1020 and kg/ha (105 lb/acre), calcium 936 kg/ha (835 lb/acre), 2030 mm (40 to 80 in). and magnesium 108 kg/ha (96 lb/acre) (6). The soils July temperatures average 21” to 24” C (70” to 75” are mostly Edneyville stony loam which is a mesic F) and January temperatures range from -1” to 2” C Typic Hapludult of the order Ultisols (20): parent (30” to 35” F) where Fraser magnolia occurs in West materials are Precambrian acid crystalline rocks, in- Virginia and Virginia, and from 2” to 4” C (35” to 40” cluding gneisses, schists, granite, diorite, and some F) in the southern end of the Appalachians, The mica-gneisses and mica-schists. frost-free period varies from 150 to 170 days in West Farther northeast, near Grandfather Mountain Virginia and Virginia, and from 170 to 180 days in (1956 m or 6,417 ft) in the Blue Ridge Front, Fraser the southern Appalachians of eastern Tennessee and magnolia grows on Ashe soil, a Typic Dystrochrept western North Carolina. derived from Cranberry granite at an elevation of about 1200 m (3,940 ft). The terrain slopes steeply to Soils and Topography the southeast, and the soils are deep, coarse, con- spicuously gray-white sandy loams or loams which are very well drained. Rainfall is well distributed Fraser magnolia is generally found on mesic sites, and plentiful throughout the year so soil moisture is but seedlings and saplings have been reported to ample and not restrictive to forest growth. occur on subxeric and even on xeric sites On the Jefferson National Forest in western Vir- (4,8,14,X,21). In the gorges of the southern Blue ginia, Fraser magnolia is found mostly on soils Ridge Front, it is more frequently found below developed from sandstone or shale. In the Ap- midslope, being most common on the lowest third of north and south slopes, and on the bottom land. In palachian Plateau of West Virginia, it grows on rich, moist, colluvial soils derived from upper-Devonian the gorge region it has an unusual habit of growing and Pennsylvanian rock formations (3,7). Fraser in a multiple-stemmed group on bottoms and as a magnolia generally grows at elevations ranging from single-stemmed tree on slopes; elsewhere it occurs in 500 to 1700 m (1,640 to 5,580 ft) but is most common either form. Sites on which it grows best are general- ly protected, moist, and fertile; soil temperatures on from about 600 to 1300 m (1,970 to 4,270 ft). such sites are generally cool during the growing season in comparison with sites farther upslope. Associated Forest Cover On lower slopes and in the bottom of the Long Spur River Gorge in the southeastern escarpment of Fraser magnolia is a moderately frequent tree the Blue Ridge Mountains between Rosman and species in a number of forest types; however, its rela- Highlands, NC, average chemical contents and other tive density is generally less than 10 percent, regard- properties of the 0 to 13 cm (0 to 5 in> soil layer of less of its size or location (3,7,8). For example, it the Tusquitee loam (an Umbric Dystrochrept of the constitutes only 0.3 percent of all trees on the Jeffer- order Inceptisols) supporting Fraser magnolia were son National Forest in western Virginia. as follows: sodium, 0.9 meq/lOO g; potassium, 0.20 At elevations greater than 1200 m (3,940 ft) as- meq/lOO g; calcium, 0.10 meq/lOO g; and magnesium, sociated species include mountain maple (Acer 440 Magnolia fraseri spicatum), striped maple (A. pensylvanicum), and sugar maple, American beech, American basswood (Tilia americana), Carolina basswood, yellow buck- eye, yellow birch (Betula alleghaniensis), and eastern hophornbeam (Ostrya virginiana) (2,3,4,6,8). Else- where, commonly associated species are: sweet birch (Bet&a lenta), hickories (Carya spp.), American chestnut (Castanea dentata) (as sprouts), flowering dogwood (Cornus florida), white ash (Fraxinus americana), Carolina silverbell (Halesia carolina), American holly (Rex opaca), butternut (Juglans cinerea), black walnut (J. nigra), yellow-poplar (Liriodendron tulipifera), cucumbertree (Magnolia acuminata), blackgum (Nyssa syluatica), sourwood (Oxydendrum arboreum), black cherry (Prunus serotina), white, scarlet, chestnut, and northern red oaks (Quercus alba, Q. coccinea, Q. prinus, and Q. rubra, respectively), black locust (Robinia pseudo- acacia), white basswood (Tilia heterophylla), and eastern hemlock (Tsuga canadensis) (14,15). Eastern white pine (Pinus strobus), pitch pine (I? rigida), Table Mountain pine (I? pungens), and shortleaf pine (I? echinata) are occasional associates. Life History Reproduction and Early Growth Any forest activity that increases the amount of incident light striking the forest floor and exposes mineral soil is conducive to the establishment of Figure a-Magnolia fraseri seedlings growing under a closed Fraser magnolia regeneration on mesic sites that mesic cove-hardwood canopy at an elevation of 945 m (3,100 ft) in have seed-bearing trees of the species. the southern Appalachians. The whorl of large, eared leaves is characteristic of the species. Flowering and Fruiting-Fraser magnolia has perfect flowers. The blossoms open from May to June comparison to other magnolias (18). In spite of low depending on latitude, elevation, and weather condi- germinative capacity, Fraser magnolia is one of the tions. The solitary flowers are about 20 to 30 cm (8 tree species that colonizes canopy gaps caused by the to 12 in) wide; they consist of six to nine obovate- fall of single, large eastern hemlocks in the Great spatulate petals conspicuously constricted below the Smoky Mountains (2). It is also common as volunteer middle (9,16). The fruit is an oblong, conelike ag- regeneration along logging roads in the southern Ap- gregate of fleshy one- or two-seeded follicles, that palachians and is found frequently as seedlings and ripen in late summer to early fall. At maturity, the saplings in small openings on mesic sites near seed- red, drupelike seeds are about 1.5 cm (0.6 in) long. bearing trees (fig. 2). Foliage begins expanding the last week in April. Seed Production and Dissemination-A good seed crop occurs only every 4 to 5 years. Cleaned Radial growth initiates in middle to late May and seeds range from 5,470 to 12,46O/kg (2,480 to continues until the second week of August; at times 5,65O/Ib), averaging 10,03O/kg (4,55O/lb) (14,18). it may last until the first week of September (14). Seedling reproduction is regarded as slow growing Seedling Development-Germination is epigeal. over most of its range when it is under closed or even Stratified seeds placed in a sandy medium and kept partial canopies; however, Fraser magnolia seedlings at day and night temperatures of 30” C (86” F) and even in clearcuts quickly fall behind other fast-grow- 20” C (68” F), respectively, from 40 to 100 days, have ing intolerant species such as yellow-poplar, black a germinative capacity of 8 to 21 percent-low in cherry, and sweet birch. 441 Vegetative Reproduction-Although Fraser that time the plot contained 22.96 m2/ha (100 magnolia seedlings have difficulty in surviving to ft2/acre) of basal area and the stand was reduced to even an intermediate canopy position, stump sprouts 1,483 trees/ha (600 trees/acre).
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