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We investigated key factors controlling mass and energy exchange by a young (6-year-old) ponderosa pine ( Pinus ponderosa  Laws.) plantation on the west side of the Sierra Nevada Mountains and an old-growth ponderosa pine forest (mix of 45- and 250-year-old trees) on the east side of the Cascade Mountains, from June through September 1997. At both sites, we operated eddy covariance systems above the canopy to measure net ecosystem exchange of carbon dioxide and water vapor, and made concurrent meteorological and ecophysiological measurements. Our objective was to understand and compare the controls on ecosystem processes in these two forests.

Carbon dioxide and water vapor exchange by young and old ponderosa pine ecosystems during a dry summer