Air humidity and radiation influence on forest transpiration

✍ Scribed by Björn Bringfelt

• Book ID: 102624189
• Publisher: Elsevier Science
• Year: 1982
• Weight: 488 KB
• Volume: 26
• Category: Article
• ISSN: 0002-1571
• DOI: 10.1016/0002-1571(82)90047-4

✦ Synopsis

The transpiration from a dry-canopy coniferous forest was evaluated hourly by the Bowen ratio--energy balance method using measurements above the canopy for two summer seasons. Average values for 52 days were determined of the flux rates of transpiration (/~) and global radiation and of the vapour concentration deficit (VCD). Values of the daily canopy surface conductance k s (calculated from E/VCD ) were found not to correlate to global radiation or VCD but correlated remarkably well with values produced by a physiologically-based function of global radiation and vcD.

A smaller transpiration rate was not found during periods with less soil water content, so probably the soil did not become dry enough to reduce transpiration.