Seasonal Variation in Cambial Electrical Resistance in Juvenile Green Ash from Different Provenances

Abstract

Electrical resistance (ER) in the cambial zone of juvenile green ash from various provenances was highly correlated with growth rate and with certain climatic features of provenance origin. Initiation of cambial activity in the spring was related to ER but not dependent on provenance origin. Cessation of cambial activity in the fall, as indicated by ER, was significantly related to origin. ER measurements of reciprocally patch-grafted cambia indicated that variation in time of cessation would not be a major cause of graft incompatibility in inter-provenance grafts.