Leaf-Water Deficits of Tree Seedlings in Relation to Soil Moisture
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.
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Document Type: Journal Article
Affiliations: Plant Physiologist, Southeastern Forest Expt. Sta., Forest Service, U.S. Dept. Agric., Charleston, S. C.
Publication date: 1969-03-01
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