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- W1988804582 abstract "Time series analysis is used to estimate the time lags between diurnal changes in the transpiration rate, shoot water potential and stem radius of early pole-stage Sitka spruce. In July 1974 data were collected hourly over 7 consecutive days on shoot water potential, stem radius changes at several heights in three trees and lengths of leading shoots in two trees. In July/August 1976 shoot water potentials were measured at four positions in the canopy, stem radius changes at two heights on a single tree and leading shoot lengths on two trees. In the 1st year transpiration rate was estimated using the Penman-Monteith equation and in the second year by an eddy-correlation/energy balance method. Time series of data were divided by a moving average technique into Trend or Periodic and Random contributions. Power spectral analysis was then used to investigate the relative importance of periodic and random changes while Serial Cross-Correlation was used to find the time lags between appropriate series. Variations in stem radius at different heights in a single tree were found to be well correlated and in phase as were such changes at the same height in different trees. Water potentials in leading shoots and at the trunk, both at two heights, were all found to be in phase. Transpiration rate and shoot water potential changes were found to be in phase while changes in stem radius at the base of the canopy lagged up to 3 h behind these. A simple resistance-capacitance analogue of water flow in Sitka spruce is proposed as a result of these relationships." @default.
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- W1988804582 date "1983-01-01" @default.
- W1988804582 modified "2023-09-25" @default.
- W1988804582 title "Time lags in the water relations of Sitka spruce" @default.
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- W1988804582 doi "https://doi.org/10.1016/0378-1127(83)90065-8" @default.
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