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Vegetation and Soil Zonation Associated with Juniperus Pinchotii Sudw

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Vegetation and Soil Zonation Associated with Juniperus Pinchotii Sudw University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln U.S. Department of Agriculture: Agricultural Publications from USDA-ARS / UNL Faculty Research Service, Lincoln, Nebraska 1991 Vegetation and Soil Zonation Associated with Juniperus Pinchotii Sudw. Trees Guy R. McPherson University of Arizona G. Allen Rasmussen Utah State University David B. Wester Texas Tech University Robert A. Masters University of Nebraska-Lincoln, [email protected] Follow this and additional works at: https://digitalcommons.unl.edu/usdaarsfacpub Part of the Agricultural Science Commons McPherson, Guy R.; Rasmussen, G. Allen; Wester, David B.; and Masters, Robert A., "Vegetation and Soil Zonation Associated with Juniperus Pinchotii Sudw. Trees" (1991). Publications from USDA-ARS / UNL Faculty. 1071. https://digitalcommons.unl.edu/usdaarsfacpub/1071 This Article is brought to you for free and open access by the U.S. Department of Agriculture: Agricultural Research Service, Lincoln, Nebraska at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Publications from USDA-ARS / UNL Faculty by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Great Basin Naturalist 51(4), 1991, pp. 316-324 VEGETAT10N AND SOIL ZONATION ASSOCIATED WITH JUNIPERUS PINCHOTII SUDW. TREES 2 3 Guy R. McPherson!, G. Allen Rasmussen , David B. Wester , and RobertA. Masters' ABSTRAcr.~Herbaceolisvegetation pattern and soil properties around individual]uniperus pinchotii Sudw. trees were studied on a grazed and a relict grassland in western Texas. Herb standing crop and soil samples were obtained under the canopy, at canopy edge, and beyond the canopy edge ofthree to five trees on each offour dates. Standing crop was lowest midway between the bole and canopy edge. Soil organic matterwas highest underjunipercanopies on both sites. Soil pH and P were notrelated to distance from treebole on either site. Herbaceous pattern from under the canopy to canopy edge apparently dependedprimarily on individual tree siZe. However, trees had little influence on herbaceous vegetation pattern 3-5 m beyond canopy edge, a response attributed to distance-independent interaction between]. pinchotii and herbaceous vegetation. Given a shallow soil underlain by indurated caliche and tree densities ranging from 288 (relict size) to 2123 (grazed site) treeslha, the interaction between]. pinchotii and herbaceous vegetation did not change over a distance of3-5 m from tree canopy edge in our study area. Key words: Juniperus pinchotii, redherry juniper, vegetation pattern, soil nutrients, herbiVOry, relic area, competition. Zones of herbaceous vegetation around the underlying soil. Soluble salts (Fireman juniperus trees have been reported for sev~ and Hayward 1952, Sharma and Tongway eral species in the western United States 1913), nitrogen and phosphorus (reviewed by (Arnold 1964; Clary 1973; Springfield 1916, Tiedemann 1987), and zinc, iron, and magne­ Everett et al. 1983, Schott and Pieper 1985). shIm (Hibbard 1940; Follett1969, Barth 1980) The most commonly recognized. vegetation have been implicated in this process. Zones are; (1) under woody plallt canopies, Juniperus pinchotii Sudw. (nomenclature where juniperus litter and shade alter micro­ follows Correll and JohIlston 1970), a sprout~ environment; (2) in a transition zone, where ing evergreen conifer commonly found on juniperus roots compete with herbaceous limestone or gypseous soils, occupies about plants for water and nutrients; and (3) in the 2.4 million ha of rangeland in western and interstice between trees, where trees do not central Texas (Adams 1972). Throughout its influence herbaceous vegetation. In contrast, range, j. pinchotii migrated ql.licldy onto a zonation pattern was not detected around prairies during the expansion of the cattle j. virginiana in Oklahoma (Engle et al. 1987) industry (1810-1920) (Hall and Carr 1968, or ]. monosperma in New Mexico (Armen~ Adams 1975). Western Texas populations of trout and Pieper 1988). In these studies, ]. pinchotii previously restricted to buttes herbaceous vegetation beyond tree canopies and escarpments have subsequently expanded' did not change with increased distance from into adjacent grasslands and have become a trees. majorvegetation component (ElliS mid Schus~ Woody species influence soil properties ter 1968). The primary objective ofthis study primarily by rooting and litterfall characteris~ was to determine the effects of individual tics (Barth 1980). Chemical constituents from juniperus pinchotii trees on herbaceous vege­ surrounding soil are taken up by tree roots tation and soil properties at a grazed and a and concentrated in biomass. Litterfall trans­ relict site in western Texas. fers much ofthis biomass to the area beneath the canopy where it accumulates, and de~ STUDY AREAS composition releases chemical constituents to Two western Texas study sites were used. IForest-Watershed Sciences Program. School ofRenewable Natural Resources. 325 Biological Sciences East, University ofArizona, Tucson, Arizona 85721. 2Range Science Department, Utah State University, 4 UMC 5230, Logan, Utah 943g2. 3Department arRange and Wildlife Management, Te.'l:us Tech University, Lubbock, Texas 79409. 4362F Plant Science Building, University ofNebraska, East Campus, Lincoln, Nebraska 68583. 316 1991] VEGETATION AND SOIL ZONATION 317 Flattop Mountain, an isolated butte 11 km Soil samples were collectedfrom the 0-10~cm northwestofSnyder(101°1O'W, 33°00'N), has soil layer halfway between boie and canopy not been grazed by livestock but is accessible edge, at canopy edge, and at 1, 2, and 3 m to Wildlife species and supports relict vegeta~ along a southwardtransectfrom five randomly tion (McPherson 1987). Nine km southeast of selected trees on each site in May 1986. De­ the butte is an area With considerable historic termination of calcium carbonate equivalent grazing pressure. The grazed site is contigu­ followed Richards (1954); organic matter con­ ous With the Llano Estacado High Plains; the tent (OM) was determined by wet digestion relict site is a High Plains outlier (Brown and (Prince 1955). Samples were analyzed for Schuster 1969). Average annual precipitation nitrogen (N), potassium (K), phosphorus is 412 mm (Dixon 1975). Dominant soil on (P), exchangeable calcium (Ca), sodium (Na), both sites is a shallow (about 50 cm) clay loam and magnesium (Mg) folloWing Onken et al. of the Lea-Slaughter complex (fine~loamy, (1980). Soluble salt and pH determination mixed, thermic Petrocalcic Paleustolls and followed McLean (1982). clayey, mixed, thermic, shallow Petrocalcic Species occurring With less than 5% fre­ Paleustolls) (Dixon et al. 1973, Dixon 1975). quency on all sites and dates were removed These sites represent environmental settings from the data set (Gauch 1982), leaving 57 whose primary extrinsic difference is domes­ species for subsequent analyses. Standing tic livestock grazing. The sites may also have crop values were log transformed (Steel and intrinsic soil differences. Torrie 1980). Analysis of variance, Fisher's protected LSD, and reciprocal averaging METHODS ordination (RA) were used to analyze the On each site, 20 juniperus plants were effect ofjuniperus trees on herbaceous vege~ selected randomly, except for the require­ tation and soil properties. Variability from ments that they were (1) beyond the shading tre.e to tree was taken into account by consid­ influence of other junipers; (2) between 1. 0 ering trees as blocks in a randomized com­ and 4.0 m tall; and (3) at least 5 m from roads, plete block design in the analysis ofvariance. shallow soil (gravel present at surface), or visi~ The "treatment effect" in this analysis Was bly disturbed areas. Standing crop of herba~ quadrat distance from tree bole. ceous vegetation was estimated around three to five randomly selected trees on each site RESULTS in July (corresponding to peak standing crop) Herbaceous Vegetation and October (to assess autumn productivity) 1984 and 1985, years in which study sites Strong interactions (P < .01) between tree received 42 and 96% of long-term groWing (block) and quadrat distance from tree (treat~ season precipitation (420 mm), respectively ment) were exhibitedby56 of51 species on all (McPherson 1987). Transects were estab­ dates and sites (a tree-x-distance interaction lished in the cardinal directions from the was not present [P > .05] for Bouteloua cur~ stem, ending 3 m beyond the canopy edge. tipendula [Michx.] Torr. on the relict site on 2 Rectangular quadrats (0.10 m ) were located any date). Tree~x-distance interactions were at midpoint between canopy edge and stem also exhibited by plant guilds (cool~season (location 1), at canopy edge (location 2), and grasses, warm~season grasses, forbs) and for at 1.0-m intervals beyond the canopy edge total standing crop. (locations 3~5). Two quadrats were randomly With only one grazed site and one relict located along each oflO randomly located 5-m site, it is not possible to statistically test the permanenttransects inthe interstice between effect of site. Within a site, apparent differ~ trees (at least 5 m from nearest juniperus ences in aboveground biomass between years plant; location I). Standing crop in quadrats (Table 1) were attributable to differences in was harvested to a 2.5~cm stubble height and precipitation (about tWice as great ill 1985 as separated by species. Herbage samples were 1984). (For elaboration ofsite and year effects oven-dried at 60 C fcir 48
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