Author(s): Granier A
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Abstract Transpiration of a Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stand was evaluated by sap flow measurements during a 4-month period. Between-tree variation in sap flow depended on crown class. On a sunny day, total transpiration was 1.6, 8.0 and 22.0 liters day(-1) for suppressed, codominant and dominant trees, respectively. Transpiration estimated by sap flow fell below potential evapotranspiration when available soil water decreased below 30\% of its maximum value. Sap flow measurements gave transpiration values similar to those obtained by the water balance method.
This article was published in Tree Physiol
and referenced in Hydrology: Current Research