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Influence of Soil Water on Root Growth Capacity of Ponderosa Pine Transplants

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Seedlings were lifted in the nursery at 6-week intervals from mid-October to mid-April and transplanted into 10 test environments in which the initial amount of available soil water was varied from 10 to 100 percent. In each test environment, root elongation, measured after 28 days and used as a measure of root growth capacity, displayed a marked seasonal periodicity: In general, root growth capacity was low in October and increased through December to a peak at the end of January; thereafter top growth began in the nursery, and root growth capacity dropped sharply. By April it was near or below the October level. The influence of available water on root growth varied with the lifting date. For all tests there was some root elongation with initial soil suctions up to 5 bars. Only in the January test was there appreciable root elongation with initial soil suctions above 9 bars. The relationship between seasonal periodicity in root growth capacity and top growth is discussed in terms of a changing metabolic pool. Forest Sci. 16: 230-239.

Keywords: Pinus ponderosa

Document Type: Journal Article

Affiliations: Assistant Specialist, School of Forestry and Conservation, Univ. of California

Publication date: June 1, 1970

More about this publication?
  • 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.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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