Professor of Forest Soils
B.A., 1981, Wittenberg University
M.S., 1984, Duke University
Ph.D., 1990, Duke University
NRM 290 - Natural Resource Issues at High Latitudes
NRM 304 - Perspectives in Natural Resource Management
NRM 380 - Soils and the Environment
NRM 482 - Why Do Boreal Forests Matter?
NRM 672 - Nutrient Cycling and Soil Fertility
NRM 694 - Adaptive Management
Dr. Valentine's broad research interest is in ecosystem ecology, biogeochemistry, and element cycling in northern ecosystems. His past research focused on the role of soils in forests, grasslands, and wetlands in generating or consuming trace gasses, especially methane, that control Earth's climate. His recent research has focused on the effects of wildfire on soil respiration and carbon balance. He teaches courses in soils, nutrient cycling, and integrating the major foundations of natural resource management: natural sciences, economics, values/ethics, and policy.
Current research programs:
1) Bonanza Creek LTER: wildfire effects on soil respiration,
2) McIntire-Stennis: influence of disturbance on soil carbon balance,
3) New Crops III: long term carbon balance assessment from resampling old research sites,
4) New Crops IV: using charcoal records to infer effects of wildfire frequency on soil C storage,
5) Other: nutrient constraints on white spruce growth in northwest AK
Examples of research support:
"LTER: Climate-Disturbance Interactions in the Alaskan Boreal Forest", National Science Foundation, $4,200,000, 1998-2004
"Soil Carbon Balance and Nitrogen Dynamics Following Disturbance by Wildfire and Logging in Interior Alaskan Forests", USDA CSREES McIntire-Stennis, $???, 2001-2006
"New Crops for New Markets: Carbon Cropping the Boreal Forest of Alaska", USDA CSREES New Crop Opportunities, $595,827, 2003-2004
Examples of publications:
DELGADO, J.A., A.R. MOSIER, D.W. VALENTINE, D.S. SCHIMEL, and W.J. PARTON. 1996. Long term 15N studies in a catena of the shortgrass steppe. Biogeochemistry 32:41-52.
MOSIER, A.R., W.J. PARTON, D.W. VALENTINE, D.S. OJIMA, D.S. SCHIMEL, and J.A. DELGADO. 1996. CH4 and N2O fluxes in the Colorado shortgrass steppe: 1. Impact of landscape and nitrogen addition. Global Biogeochemical Cycles 10(3):387-399.
PARTON, W.J., A.R. MOSIER, D.S. OJIMA, D.W. VALENTINE, D.S. SCHIMEL, K. WEIER, and A.E. KULMALA. 1996. Generalized model for N2 and N2O production from nitrification and denitrification. Global Biogeochemical Cycles 10(3):401-412.
MOSIER, A.R., W.J. PARTON, D.W. VALENTINE, D.S. OJIMA, D.S. SCHIMEL, and O. HEINEMEYER. 1997. CH4 and N2O fluxes in the Colorado shortgrass steppe: 2. Long-term impact of land use change. Global Biogeochemical Cycles 11(1):29-42.
MOSIER, A.R., J.A. DELGADO, V.L. COCHRAN, D.W. VALENTINE, and W.J. PARTON. 1997. Impact of agriculture on soil consumption of atmospheric CH4 and a comparison of CH4 and N2O flux in subarctic, temperate and tropical grasslands. Nutrient Cycling in Agroecosystems 49(1-3):71-83.
BINKLEY, D., Y. SON, and D.W. VALENTINE. 2000. Do forests receive occult inputs of nitrogen? Ecosystems 3(4):321-331.
MENEZES, R.S.C., E.T. ELLIOTT, D.W. VALENTINE, and S.C. WILLIAMS. 2001. Carbon and nitrogen dynamics in elk winter ranges. Journal of Range Management 54:400-408.
HIBBARD, K.A., S. ARCHER, D.S. SCHIMEL, and D.W. VALENTINE. 2001. Biogeochemical changes accompanying woody plant encroachment in a subtropical savanna. Ecology 82:1999-2011.
CASTELLS, E., J. PEÑUELAS, AND D.W. VALENTINE. 2003. Influence of the phenolic compound bearing species Ledum palustre on soil N cycling in a boreal hardwood forest. Plant and Soil 251:155-166.