USDA Scientists Study Effects of Rising Carbon Dioxide on Rangelands
By Don Comis
WASHINGTON—Rising carbon dioxide (CO2) levels can reverse the drying effects of predicted higher temperatures on semi-arid rangelands, according to a study published today in the scientific journal Nature by a team of U.S. Department of Agriculture (USDA) and university scientists. (ARS)
Uh oh, CO2 actually reverses temperature effect on rangelands
The results of a USDA experiment called PHACE (Prairie Heating and CO2 Enrichment)where liquid CO2 is injected into the ground from a storage tank, then effects measure on grassland growth, shows a surprising result: increased range grass growth leading to retaining more soil moisture. I hate it when that happens. I’ll have to give them credit though, back in 2007 in the paper starting the project they theorized from models that:
Model results suggest that soil water content, plant production, soil respiration, and nutrient mineralization will increase for the high-CO treatment. Soil water content will decrease for all years, while nitrogen mineralization, soil respiration, and plant production will both decrease and increase under warming depending on yearly differences in water stress.
And the credit is, they followed through with a ground truth experiment to verify the model. (WUWT)



