We established transects under twenty Juniperus virginiana trees that invaded an unburned central Oklahoma grassland within the last 20 years to determine their effects on plant species composition. Species richness and stem density increased as distance from the trunk increased. Stem density was also higher towards the south side of trees. Graminoid, forb and total cover were related to distance from the trunk and transect direction. Ordination revealed weak compositional gradients related to “openness” and compass direction. Woody species tended to be most abundant underneath J. virginiana canopies whereas grass and forb species were most abundant in the prairie. Woody and shadetolerant species preferentially occurred in north transects and quadrats underneath the tree. Conversely, forbs had highest abundance on edge quadrats whereas graminoids dominated south transects and prairie quadrats. Thus, invasion of grasslands by J. virginiana influences species composition in a spatially complex manner.
Diameter at Breast Height
partial Canonical Correspondence Analysis
Axmann, B.D. and A.K. Knapp. 1993. Water relations of Juniperus virginiana and Andropogon gerardii in an unburned tallgrass prairie. Southwestern Naturalist 38:325–330.
Bragg, T.B. and L.C. Hulbert. 1976. Woody plant invasion of unburned Kansas bluestem prairie. J. Range Manage. 29:19–23.
Briggs, J.M., G.A. Hoch and L.C. Johnson. 2002a. Assessing the rate, mechanisms, and consequences of the conversion of tall-grass prairie to Juniperus virginiana forest. Ecosystems 5:578–586.
Briggs, J.M., A.K. Knapp and B.L. Brock. 2002b. Expansion of woody plants in tallgrass prairie: A fifteen-year study of fire and fire-grazing interactions. Am. Midland Nat. 47:287–294.
Coppedge, B.R., D.M. Engle, S.D. Fuhlendorf, R.E. Masters and M.S. Gregory. 2001. Landscape cover type and pattern dynamics in fragmented southern Great Plains grasslands, USA. Landscape Ecol. 16:677–690.
Engle, D.M., J.F. Stritzke and P.L. Claypool. 1987. Herbage standing crop around eastern redcedar trees. J. Range Manage. 40:237–239.
Facelli, J.M. and S.T.A. Pickett. 1991a. Plant litter: Light interception and effects on an old-field plant community. Ecology 72:1024–1031.
Facelli, J.M. and S.T.A. Pickett. 1991b. Plant litter: Its dynamics and effects on plant community structure. Bot. Rev. 57:1–32.
Facelli, J.M. 1994. Multiple indirect effects of plant litter affect the establishment of woody seedlings in old fields. Ecology 75:1727–1735.
Fuhlendorf, S.D. 1992. Influence of age/size and grazing history on understory relationships of Ashe juniper. MSc Thesis, Texas A&M University, College Station, Texas.
Gehring, J.L. and T.B. Bragg. 1992. Changes in prairie vegetation under eastern redcedar (Juniperus virginiana L.) in an eastern Nebraska bluestem prairie. Am. Midland Nat. 128:209–217.
Hallgren, E., M.W. Palmer and P. Milberg. 1999. Data diving with cross-validation: an investigation of broad-scale gradients in Swedish weed communities. J. Ecol. 87:1–16.
Hulbert, L.C. 1969. Fire and litter effects in undisturbed bluestem prairie in Kansas. Ecology 50:874–877.
Jameson, D.A. 1966. Pinyon-Juniper litter reduces growth of blue grama. J. Range Manage. 19:214–217.
Joy, D.A. and D.R. Young. 2002. Promotion of mid-successional seedling recruitment and establishment by Juniperus virginiana in a coastal environment. Plant Ecol. 160:125–135.
Knapp, A.K. and T.R. Seastedt. 1986. Detritus accumulation limits productivity of tallgrass prairie. BioScience 36:662–667.
Legendre, P. and L. Legendre. 1998. Numerical Ecology. Elsevier, Amsterdam.
Licht, D.S. 1997. Ecology and Economics of the Great Plains. University of Nebraska Press, Lincoln, Nebraska
Linneman, J.S. 2004. Studies of eastern redcedar ecology in central Oklahoma. MSc Thesis, Oklahoma State University, Stillwater, Oklahoma.
Myster, R.W. 1994. Contrasting litter effects on old field tree germination and emergence. Vegetatio 114:169–174.
Oksanen, J. 1996. Is the humped relationship between species richness and biomass an artifact due to plot size? J. Ecol. 84:293–295.
Palmer, M.W., D.B. Clark and D.A. Clark. 2000. Is the number of tree species in small tropical forest plots nonrandom?. Community Ecol 1:95–101.
Samson, F. and F. Knopf. 1994. Prairie conservation in North America. BioScience 44:418–421.
Smith, D.D. 1998. Iowa prairie: Original extent and loss, preservation and recovery attempts. Journal of the Iowa Academy of Science 105:94–108.
Smith, S.D. and J. Stubbendieck. 1990. Production of tallgrass prairie herbs below eastern redcedar. Prairie Naturalist 22:13–18.
ter Braak, C.J.F. and P. Šmilauer. 2002. Canoco for Windows 4.5. Biometris-Plant Research International. Wageningen, Netherlands.
USDA, NRCS. 2004. The PLANTS Database, Version 3.5 (http://plants.usda.gov). National Plant Data Center, Baton Rouge, LA 70874–4490 USA.
Weaver, J.E. and N.W. Rowland. 1952. Effect of excessive natural mulch on the development, yield, and structure of a native grassland. Bot. Gaz. 114:1–19.
Yager, L.Y. and F.E. Smeins. 1999. Ashe juniper (Juniperus ashei: Cupressaceae) canopy and litter effects on understory vegetation in a juniper-oak savanna. Southwestern Naturalist 44:6–16.
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Linneman, J.S., Palmer, M.W. The effect of Juniperus virginiana on plant species composition in an Oklahoma grassland. COMMUNITY ECOLOGY 7, 235–244 (2006). https://doi.org/10.1556/ComEc.7.2006.2.10
- Juniperus virginiana
- Tallgrass prairie
- NRCS (2004)