Development of the deuterium tracing method for the estimation of transpiration rates and transpiration parameters of trees
Conference
·
OSTI ID:140038
- Inst. of Hydrology, Wallingford (United Kingdom)
Recent developments relating to the theory and practice of the deuterium tracing method are reviewed. Theoretical developments have shown that the method is applicable to the fluctuating flow regime which occurs in trees and that the method provides an estimate of the weighted mean flow over the time period that the tracer is present at the sampling point. A practical development of the method for estimating transpiration rates and transpiration parameters which uses time averaged sampling is described and it is shown that with this method only one deuterium tracer concentration analysis is required per tree compared with 90 using an earlier method. The calculation of surface resistance through solution of the convolution integral of the transpiration rate and the tracer concentration-time curve is also described and the sensitivity of the surface resistance estimate to the flow parameters is investigated using as an example observations made on a three year old plantation of Eucalyptus tereticornis growing in Karnataka, southern India.
- OSTI ID:
- 140038
- Report Number(s):
- CONF-9102202--; ISBN 0-471-93561-1
- Country of Publication:
- United States
- Language:
- English
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