Data from: CO2 enrichment and soil type additively regulate grassland productivity

Atmospheric CO2 enrichment usually increases aboveground productivity
(ANPP) of grassland vegetation, but the magnitude of the ANPP-CO2 response
differs among ecosystems. Soil properties affect ANPP via multiple
mechanisms and vary over topographic to geographic gradients, but have
received little attention as potential modifiers of the ANPP-CO2 response.
We assessed effects of three soil types, sandy loam, silty clay, and clay,
on the ANPP response of perennial C3/C4 grassland communities to a
subambient to elevated CO2 gradient over 10 years in Texas, USA. We
predicted an interactive, rather than additive, effect of CO2 and soil
type on ANPP. Contrary to prediction, CO2 and soil additively influenced
grassland ANPP. Increasing CO2 by 250 μL L-1 increased ANPP by 170 g m-2
across soil types. Increased clay content from 10% to 50% among soils
reduced ANPP by 50 g m-2. CO2 enrichment increased ANPP via a predominant
direct effect accompanied by a smaller indirect effect mediated by
successional shift to increased dominance of the C4 tallgrass Sorghastrum
nutans. Our results indicate a large, positive influence of CO2 enrichment
on grassland productivity that resulted from direct physiological benefits
of CO2 augmented by species succession and was expressed similarly across
soils of differing physical properties.