The Relationship Between Spatial and Temporal Tracer Profiles in Transport Studies

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Abstract
The relationship between spatial and temporal tracer profiles is established, and used to re-analyse reported profiles of both types. Evidence of dispersive flow (i.e. a range of transport speeds) in phloem translocation is obtained from both spatial and temporal profiles. Previous suggestions of plug flow are shown probably to be a consequence of too long a time interval between successive measurements in obtaining these profiles.