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GLOBAL BIOGEOCHEMICAL CYCLES, VOL. 7, NO. 1, PAGES 81–95, 1993

Detecting the Aerial Fertilization Effect of Atmospheric CO₂ Enrichment in Tree-Ring Chronologies

Donald A. Graybill

Laboratory of Tree-Ring Research, University of Arizona, Tucson

Sherwood B. Idso

U.S. Water Conservation Laboratory Agricultural Research Service Phoenix, Arizona

Abstract

The growth-promoting effects of the historical increase in the air's CO₂ content are not yet evident in tree-ring records where yearly biomass additions are apportioned among all plant parts. When almost all new biomass goes into cambial enlargement, however, a growth increase of 60% or more is observed over the past two centuries. As a result, calibration of tree-ring records of this nature with instrumental climate records may not be feasible because of such growth changes. However, climate signals prior to about the mid-19th century may yet be discovered by calibrating such tree-ring series with independently derived proxy climate records for those times.

Received 23 June 1992; accepted 22 October 1992.

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Citation: Graybill, D. A., and S. B. Idso (1993), Detecting the Aerial Fertilization Effect of Atmospheric CO₂ Enrichment in Tree-Ring Chronologies, Global Biogeochem. Cycles, 7(1), 81–95.

Copyright 1993 by the American Geophysical Union.