DOE- National Institute of Climate Change Research. 2006-2007. Altered precipitation distribution and warming effects in oak savanna: linking plant functional traits and ecosystem processes. Co-principal investigator with A. Volder; Principal investigator, M.G. Tjoelker.

DOE- National Institute of Global Environmental Change – TUL-132-02/03. Impact of altered precipitation distribution and warming on tree and grass life forms in oak savanna. Principal investigator, M.G. Tjoelker, co-principal investigator.

USDA/CSREES - Rangeland Research Grant 96-38300-3071, Does soil carbon and nitrogen accumulation beneath plants regulate bunchgrasses? Principal investigator.

USDA/NRI - Range, Forest and Crop Ecosystems. Grant 95-37101-2029, A functional interpretation of herbivory resistance in mesic grasslands. Principal Investigator, K.L. Launchbaugh Co-principal investgator.

USDA/CSREES - Rangeland Research. Grant 95-38300-1695, R:FR regulation of tiller initiation: Is it applicable to range grasses? Principal investigator.

USDA/CSREES - Rangeland Research. Grant 92-38300-7459. Structure and function of the bunchgrass growthform: An alternative hypothesis. Principal investigator, T.W. Boutton Co-principal investigator.

USDA/NRI - Range, Forest and Crop Ecosystems. Grant 92-37101-7463. A demographic basis for monitoring and forecasting vegetation change in grassland communities. Principal investigator with S.R. Archer, T.W. Boutton and F.E. Smeins as Co-Principal investigators.

USDA/CSREES - Rangeland Research. Grant 90-38300-5097. Mechanisms regulating axillary bud growth in perennial grasslands. Principal investigator.