Hilgardia
Hilgardia
Hilgardia
University of California
Hilgardia

Blue oak enhance soil quality in California oak woodlands

Authors

Randy A Dahlgren
William R Horwath
Kenneth W Tate
Trina J Camping

Authors Affiliations

R.A. Dahlgren is Professor, Soils and Biogeochemistry Program; W.R. Horwath is Professor, Soils and Biogeochemistry Program; K.W. Tate is Rangeland Watershed Specialist, Department of Agronomy and Range Science; T.C. Camping is Graduate Research Assistant, Soil Science Graduate Group, UC Davis. Funding for this project was provided by the Kearney Foundation of Soil Science and UC Integrated Hardwood Range Management Program. We thank the staff of the UC Sierra Foothill and Hopland Research and Extension Centers for their assistance with this project.

Publication Information

Hilgardia 57(2):42-47. DOI:10.3733/ca.v057n02p42. April 2003.

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Abstract

Blue oaks create islands of enhanced soil quality and fertility beneath their canopy. The quality of soil beneath the oak canopy is considerably better than that of the grasslands adjacent to the trees. We found evidence of improved soil quality under blue oaks for physical, chemical and biological soil properties. The type of vegetation (oak versus annual grasses) has a much stronger influence on soil organic matter and nutrient pools than does soil parent material. Removal of oak trees results in a rapid deterioration of soil quality with the majority of the loss occurring within 10 to 20 years after tree removal.

References

Barbour M, Pavlik B, Drysdale F, Lindstrom S. California's Changing Landscapes - Diversity and Conservation of California Vegetation. Sacramento: California Native Plant Society 1993. pp.83-9.

Camping TJ, Dahlgren RA, Tate KW, Horwath WR, Standiford RB, McCreary D, Purcell KL. Changes in soil quality due to grazing and oak tree removal in California blue oak woodlands. Oaks in California's Changing Landscape. 2002. Berkeley, CA: USDA, Gen. Tech. PSW-184. p. 75-85.

Dahlgren RA, Singer MJ. Nutrient cycling in managed and non-managed oak woodland-grass ecosystems. Final Report: Integrated Hardwood Range Management Program. Land, Air and Water Resources Paper - 100028. UC Davis, Davis, CA 1994. p.91.

Dahlgren RA, Singer MJ, Huang X. Oak tree and grazing impacts on soil properties and nutrients in a California oak woodland. Biogeochem. 1997. 39:45-64. https://doi.org/10.1023/A:1005812621312

Frost WE, Bartolome JW, Connor JM, Pillsbury NH, Verner J, Tietje WD. Understory-canopy relationships in oak woodlands and savannas. Oak Woodlands: Ecology, Management, and Urban Interface Issues. 1997. Berkeley, CA: USDA, Gen. Tech. PSW-160. p. 183-90.

Griffin JR, Barbour MG, Major J. Oak woodland. Terrestrial Vegetation of California. 1977. New York: Wiley. p. 383-416.

Kay BL, Plumb TR, Pillsbury HR. The effect of blue oak removal on herbaceous production on a foothill site in the northern Sierra Nevada. Multiple Use Management of California's Oak Hardwood Resources. 1987. Berkeley, CA: USDA, Gen. Tech. PSW-100. p. 343-50.

Pavlik BM, Muick PC, Johnson S, Popper M. Oaks of California. 1991. Los Olivos, CA: Cahuma Press and the California Oak Foundation. 184p.

Ridolfi MC, Dahlgren RA, Horwath WR, Tate KW. Changes in soil quality due to oak tree removal in California oak woodlands. Annual Report of Research Projects, 1998-1999. 2000. Berkeley, CA: Kearney Foundation of Soil Science. p. 18-27.

Soil Survey Staff. Procedures for collecting soil samples and methods of analysis for soil survey. Soil Survey Investigations Rep. No. 1. USDA-SCS Agricultural Handbook 436. 1984. Washington, DC: US Government Printing Office. 68p.

Standiford RB, McCreary D, Frost W, Standiford RB, McCreary D, Purcell KL. Modeling the effectiveness of tree planting to mitigate habitat loss in blue oak woodlands. Oaks in California's Changing Landscape. 2002. Berkeley, CA: USDA, Gen. Tech. PSW-184. p. 591-600.

Weaver RW, Angle JS, Bottomley PS. Methods of Soil Analysis, Part 2 - Chemical and Biochemical Properties. 1994. 2nd ed. Madison, WI: American Society of Agronomy.

Dahlgren R, Horwath W, Tate K, Camping T. 2003. Blue oak enhance soil quality in California oak woodlands. Hilgardia 57(2):42-47. DOI:10.3733/ca.v057n02p42
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