Pacific Southwest

Title: Soil Aeration and Tree Health: Correlating Soil Oxygen Measurements with the Decline of Established Oaks

Author: L. R. Costello, J. D. MacDonald, and K. A. Jacobs

Date: 1991

Source: In: Standiford, Richard B., tech. coord. 1991. Proceedings of the symposium on oak woodlands and hardwood rangeland management; October 31 - November 2, 1990; Davis, California. Gen. Tech. Rep. PSW-GTR-126. Berkeley, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture; p. 295-299

Station ID: GTR-PSW-126

Description: Field measurements of oxygen concentration and oxygen diffusion rate (ODR) indicate that ODR is a more reliable indicator of problem sites. In a landscaped area where oak trees are declining, ODR in the upper part of the soil profile ranged between 0.1-0.2 µg O₂cm²/minute (where µg = micrograms, and O₂ = oxygen) for weeks at a time. In laboratory experiments, we have found low oxygen levels to inhibit oak root growth, and to predispose cork oak roots to extensive colonization by Phytophthora cinnamomi. Work is continuing to better define stress thresholds, and the effectiveness of aeration management practices in alleviating root stress.

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Citation

L. R. Costello, J. D. MacDonald, and K. A. Jacobs  1991.  Soil Aeration and Tree Health: Correlating Soil Oxygen Measurements with the Decline of Established Oaks.   In: Standiford, Richard B., tech. coord. 1991. Proceedings of the symposium on oak woodlands and hardwood rangeland management; October 31 - November 2, 1990; Davis, California. Gen. Tech. Rep. PSW-GTR-126. Berkeley, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture; p. 295-299.