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Soil and Plant Moisture Relations of Red Pine Growing on a Shallow Soil¹

ABSTRACT

The relationship of plant moisture status to soil moisture content was studied in a 25-year-old red pine, Pinus resinosa Ait., plantation on 60 cm of channery silt loam soil over fractured siltstone bedrock. Two of the four-tree plots received summer rainfall; rainfall was excluded from the remaining two plots by a plastic ground covering. The relative turgidity and needle moisture content of current- and second-year needles were measured; only the second-year needle relative turgidity was significantly correlated with soil moisture content. Wood moisture content was not correlated with soil moisture content. The dry weight of current-year needles was closely related to the soil moisture availability during the period of growth. The degree to which the underlying bedrock was fractured, allowing roots to penetrate, was a primary factor in survival.

¹ Research supported in part by Northeast Regional Research Project 27. Cornell University Agronomy Dep. Paper no. 789. Presented before Div. S-7, Soil Science Society of America, Washington, D.C. Nov. 8, 1967.

² Authors are, respectively, Research Assistant, and Charles Lathrop Pack Professor of Forest Soils, Dep. of Agronomy, Cornell University, Ithaca, N.Y.

Received for publication November 20, 1967. Accepted for publication May 14, 1968.