Co-Authors:
Moreshet, S., Division of Agricultural Meteorology, Institute of Soils and Water, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
Abstract:
Physiological activity including I4CO2, uptake, growth, stomatal conductance and evapotranspiration of Eucalyptus camaldulensis Dehn. trees from two seed sources were compared: one from the tropical climate of northern Australia (Katherine), and the other from the dry subtropical climate of southern Australia (Lake Albacutya). The trees were grown in the semiarid climate (rainless summer) of southern Israel. Diurnal measurements were made on nine occasions during the winter and summer of 1974175 on 4-yrold seedling trees. Physiological activity was low before the rains started. After the onset of rains renewal of activity was first detected in the Katherine provenance seedlings, but after a short period the Lake Albacutya provenance seedlings showed higher rates of activity, reaching maximum midday rates of stomatal conductance and CO2 uptake of 2.2 mm s-1 and 0.24 mg m-2 s-1 respectively. Activity during the summer of 1975 was very low, but CO2 uptake and stomatal conductance after the rains of winter 1975:76 returned to the levels observed in the previous winter. The growth of seedlings of the two provenances, as indicated by the cumulative change in stem diameter, was well correlated with the evapotranspiration. Growth of the Katherine provenance seedlings did not recover after a dry period during the second winter. Analysis of the data suggested that the seedlings which originated in the cooler and drier region of Australia were better adapted to the semiarid conditions of southern Israel than were those from the tropical region, although the aridity of the region imposed severe restraints on the growth of both provenances. © 1981 CSIRO. All rights resereved.
תפריט נגישות
ניגודיות עדינה
מונוכרום
הדגשת קישורים
חסימת אנימציה
פונט קריא
סגור
איפוס הגדרות נגישות
להורדת מודול נגישות חינם
