U.S. Department of Agriculture: Agricultural Research Service, Lincoln, Nebraska

 

Document Type

Article

Date of this Version

2007

Comments

Published in Functional Ecology (2007) 21, 11–18.

Abstract

During May, July and October 2000, we measured the effects of temporarily increasing or decreasing CO2 concentration by 150–200 μmol mol−1 on daytime net ecosystem CO2 exchange (NEE) and water flux (evapotranspiration, ET) of C3–C4 grassland in central Texas, USA that had been exposed for three growing seasons to a CO2 gradient from 200 to 560 μmol mol−1. Grassland grown at subambient CO2 (< 365 μmol mol−1) was exposed for 2 days to an elevated CO2 gradient (> 365 μmol mol−1). Grassland grown at elevated CO2 was exposed for 2 days to a subambient gradient. Our objective was to determine whether growth CO2 affected the amount by which grassland NEE and ET responded to CO2 switching (sensitivity to CO2).

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