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A Measure of the Effect of Soil and Atmospheric Moisture on the Growth of Ponderosa Pine

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Simultaneous measurements of foliage moisture, diameter growth, precipitation, air temperature, and relative humidity were taken from June 22, 1961 to September 7, 1961 on 3 1/25-acre plots in second growth Pinus ponderosa Laws. stands located near McNary, Ariz. Plots 1 and 2 were artificially watered at rates of 1 and 2 inches of water per week with plot 3 utilized as a control plot. Artificially increasing soil moisture beyond levels resulting from natural precipitation significantly increased the diameter growth of the pine and a close relationship between diameter growth and amount of precipitation was established. Foliage moisture content was not significantly related to precipitation, nor did artificially increased soil moisture levels yield significant differences in foliage moisture content. A maximum daily temperature of approximately 70° F appeared to be optimum for diameter growth. Growth inhibition was associated with higher temperatures. Weekly fluctuations in growth and relative humidity followed similar patterns, leading to the conclusion that water tension in the plant, as influenced by temperature and/or relative humidity, is a primary factor in limiting growth.
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Document Type: Journal Article

Affiliations: Associate Professor, Department of Watershed Management, University of Arizona, Tucson

Publication date: 1964-12-01

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  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
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