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Seasonal Water Movement in Tree Stems

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Water movement in boles of 60-year-old lodgepole pine (Pinus contorta Dougl.) and red fir (Abies magnifica A. Murr.) in the Sierra Nevada of California was estimated by monitoring the ascent of 32P injected into small roots. Daytime rates of ascent for both species ranged from 12 to 84 cm/hr in summer. No movement occurred in lodgepole pine during winter. Winter rates for red fir averaged 0.4 to 1.4 cm/hr. In October, volume of daytime water movement was estimated to range from 1.3 to 5.3 l/hr in boles of individual trees. The technique may be used to estimate transpiration from a forest area. Expanding the volume of water transport to a hypothetical hectare of forest gave a transpiration rate of 0.16 cm/day in October. Forest Sci. 18:266-272.

Keywords: Abies magnifica; Pinus contorta; autoradiography; radioisotopes; transpiration

Document Type: Journal Article

Affiliations: Research Foresters, Pacific Southwest Forest and Range Exp. Stn., USDA Forest Service, Berkeley, Calif.

Publication date: December 1, 1972

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