300, 600 and 900 ppm Increases in the Air's CO2 Concentration:
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California Annual Grassland [Avena barbata Pott ex Link (Slender Oat), Bromus hordeaceus L. (Soft Brome), Hemizonia congesta DC. (Hayfield Tarweed), Lotus wrangelianus Fisch. & C.A. Mey. (Chilean Birdsfoot Trefoil), and Nassella pulchra (A.S. Hitchc.) Barkworth (Tussock Grass)]
300 ppm
|
600 ppm
|
900 ppm
|
|
Number of Results |
2
|
|
|
Arithmetic Mean |
20.5%
|
|
|
Standard Error |
2.5%
|
|
|
Experimental Conditions
|
300 ppm
|
600 ppm
|
900 ppm
|
|
Hungate et al. (1997) |
open-top chambers, detrital roots,low nutrients
|
24%
|
|
|
Hungate et al. (1997) |
open-top chambers, detrital roots,high nutrients
|
17%
|
|
|