Reports

Recent Change in the Pattern of Tree Growth in Northern Arizona

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Science  03 Nov 1961:
Vol. 134, Issue 3488, pp. 1417-1418
DOI: 10.1126/science.134.3488.1417

Abstract

A significant change in growth pattern among the ponderosa pines (Pinus ponderosa Laws.) of the Flagstaff region, northern Arizona, occurred in 1947-1948. This is the first such change since 1904-1905. Evidence appears to verify the existence of a tension zone which fluctuates in altitude as a result of changes in the distribution and quantity of the rainfall as recorded through soil moisture.

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