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Long-term measurements of CO2 flux and evapotranspiration in a Chihuahuan desert grassland
- Mielnick, P., Dugas, W.A., Mitchell, K., Havstad, K.
- Journal of arid environments 2005 v.60 no.3 pp. 423
- deserts, arid zones, grasslands, Bouteloua eriopoda, C4 plants, carbon dioxide, gas exchange, evapotranspiration, precipitation, temporal variation, New Mexico
- We measured CO₂ and evapotranspiration (ET) fluxes above a Chihuahuan desert grassland from 1996 through 2001. Averaged across six years, this ecosystem was a source (positive flux) of CO₂ in every month. Over that period, sustained periods of carbon uptake (negative flux) were rare. Averaged across all months, we estimated that CO₂ was being released into the atmosphere at a rate of +1.5 g CO₂ m⁻² d⁻¹ (+0.40 g C m⁻² d⁻¹) or +533 g CO₂ m⁻² yr⁻¹ (+145.3 g C m⁻² yr⁻¹). Average ET was 299 mm yr⁻¹ with a monthly range of 0.15 mm d⁻¹ in December to 2.15 mm d⁻¹ in August.