Abstract
The ability to routinely determine the influence of a lack of water on forest productivity would aid foresters in managing the timber supply. An approach to modeling water use is presented and the simulations compared with measurements of tree growth. Daily solar radiation, air temperature and rainfall are used in the simulation of the water balance of a Douglas-fir stand for the period April to October 1959–1983. Daily values of net radiation, evapotranspiration, rainfall interception, a water deficit and drainage are calculated. Measurements of annual basal area increment for 1965–1980 are used to index stand response to the water balance. Water deficits varied from 0 to 167 mm depending on the summer rainfall. Four general patterns of the water balance were identified. These involve the presence or absence of late spring and mid-summer dry periods and an early summer rainy period. The annual basal area increment was well correlated with accumulated transpiration during the spring and summer.
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Spittlehouse, D.L. (1985). Determination of the Year-To-Year Variation in Growing Season Water Use of a Douglas-Fir Stand. In: Hutchison, B.A., Hicks, B.B. (eds) The Forest-Atmosphere Interaction. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5305-5_15
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DOI: https://doi.org/10.1007/978-94-009-5305-5_15
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