Abstract
Wood structure and seasonal variation of the cambial activity were investigated in Prosopis flexuosa DC. in order to enable the use of this species in dendrochronological and ecological studies requiring exact age determination. Cambial activity was determined by counting the number of undifferentiated cells in each radial file. Change in vessel diameter and a terminal parenchyma band, containing rhombic crystals, mark the annual growth layer. Even though the growth rings are not always clearly demarcated, one growth ring is generally formed each year. Prosopis flexuosa has an annual rhythm of wood production which coincides with the climatic rhythm. It is possible to cross-date disk samples of Prosopis species, and a first chronology has been established. Relationships between xylem production, phenology and climatic factors are discussed.
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