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Tree Growth as Affected by Soil Moisture Availability

ABSTRACT

Merchantable volume growth in a managed southern pine forest was measured every 3 years from 1940 through 1960. Available soil moisture in the surface foot was estimated for each day of the 21 growing seasons. The soil-moisture estimates were combined with estimates of potential evapotranspiration to calculate indexes of potential growth. Linear regressions of measured growth on calculated potential growth explained 95 to 97% of the variation about the regression lines. With sufficient soils information and past measurements of growth, foresters may be able to estimate current annual growth in timber stands.

¹ Timber Management Laboratory, maintained at Crossett, Ark., by the Southern Forest Exp. Sta., USDA Forest Serv., in cooperation with the Georgia-Pacific Corp., Crossett Division.

Received for publication September 11, 1963. Accepted for publication January 30, 1964.