Seasonal Changes of Tissue-Water Relations in Shoots and Root Systems of Douglas-fir Seedlings
Abstract:Values of bulk osmotic potential at full turgor (o), water potential at which the bulk turgor pressure first reaches zero (z) and maximum bulk elastic modulus (max) were monitored monthly for 13 months in the shoot and root systems of 2- to 3-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings using the pressure-volume method. In shoots, o and z went through two maxima and minima throughout the year; the minima for o and z were - 2.3 and - 3.8 MPa, respectively, in midwinter and - 2.5 and - 3.5 MPa, respectively, in midsummer. max was lowest (elasticity highest) in April (5.0 MPa) and highest in September (17.0 MPa). In root systems o was nearly constant at - 1.0 MPa all year, while z dropped to a minimum annual value of -3.0 MPa in July and reached maxima (-2.0 MPa) in March and September. Turgor maintenance capacity changed seasonally due to changes in o (osmotic adjustment). Dynamics of these and other tissue water relations properties are discussed in relation to phenological developmental stages, frost hardiness, and drought tolerance. Forest Sci. 30:538-548.
Document Type: Journal Article
Affiliations: Forestry Research Associate, Forest Research Institute, Private Bag, Rotorua, New Zealand
Publication date: June 1, 1984
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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.
2015 Impact Factor: 1.702
Ranking: 16 of 66 in forestry
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