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Leaf-Water Deficits of Tree Seedlings in Relation to Soil Moisture

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Abstract:

Leaf-water deficits (WD) of slash pine (Pinus elliottii Engelm.), sand pine (P. clausa (Chapm.) Vasey), longleaf pine (P. palustris Mill.), and turkey oak (Quercus laevis Walt.) seedlings grown in pots in a Lakeland sand soil were measured concurrently with soil moisture during one 49-day drying cycle. The variation of residual WD with variation of soil moisture content was interpreted in terms of the relationship between soil moisture content and soil moisture tension as shown by a moisture-retention curve. At moisture tensions of less than 1 to 4 bars, WD was low and nearly independent of soil moisture. As moisture tension increased above this range of values, WD increased markedly with small decreases in soil moisture (SM). The form of the relationship can be represented as log WD = a + (b/SM) with soil moisture content expressed as percent of dry weight.

Keywords: Pinus clausa; Pinus elliottii; Pinus palustris; Quercus laevis

Document Type: Journal Article

Affiliations: Plant Physiologist, Southeastern Forest Expt. Sta., Forest Service, U.S. Dept. Agric., Charleston, S. C.

Publication date: March 1, 1969

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.
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