For Rapid Cambial Growth

Reduced rates of ^ pell division

Fewer xylem * cells differentiated

FIGURE 10.4 A schematic diagram showing how low precipitation and high temperature during the growing season may lead to the formation of a narrow tree ring in arid-site trees. Arrows indicate the net effects and include various processes and their interactions. It is implied that the effects of high precipitation and low temperature are the opposite and may lead to an increase in ring widths (Fritts, 1971 ).

Decreased activity in meristems during growing season

Fewer leaves

Less photosynthetic area

Smaller leaves absorption of mineral salts

Decreased absorption of water absorption of mineral salts rt '„

Decreased absorption of water

Less photosynthetic area

Less production of cell parts and substances

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