Cheng, W.(PI) and M.K. Firestone. Carbon and nitrogen interchange in the rhizosphere: Sensitivity to temperature and water dynamics. US Department of Agriculture, National Research Initiative Competitive Grant Program. 2006-2009.
Ravelo, C., P. Koch, R. Kudela, M.D. MacCarthy and W. Cheng (Co-PI). Acquisition of light stable isotope mass spectrometers for biogeochemistry and environmental change at University of California, Santa Cruz. National Science Foundation. 2004-2007.
Goldstein, A.H., W. Cheng (Co-PI), and D. D. Baldocchi. Controls of canopy photosynthetic activity on roots and soil carbon dynamics in ponderosa pine and oak/savanna ecosystems. Kearney Foundation. 2004-2007.
Cheng; W. (PI) and D.W. Johnson. Patterns of rhizosphere effects on soil organic matter decomposition and nitrogen dynamics, US Department of Agriculture, National Research Initiative Competitive Grant Program. 2004-2006
Goldstein, A., W. Cheng (Co-PI), and Q. Ye. Controls of canopy activities on roots and soil carbon dynamics in a young ponderosa pine forest. Kearney Foundation. 2002-2004.
Cheng, W. (PI) and M. Loik. Creating a New Digital Image Library––WEWU: Windows to the Ecological World Underground. UC Instructional Improvement Program: New Technologies in Teaching (see the web page: ic.ucsc.edu/~wxcheng/wewu/). 2001-2002.
Cheng, W. (PI) Explore asymbiotic nitrogen fixation in forest ecosystems using 15N. Social Sciences Divisional Research Award. 2001-2002.
Cheng, W. (PI). Supplemental support to the grant entitled “Rhizosphere respiration and root demography in forest ecosystems.” National Science Foundation, Research Experience for Undergraduates (REU). 1999-2001.
Cheng, W. (PI), D.W. Johnson, P.S. Verberg, and R.F. Walker. Rhizosphere respiration and root demography in forest ecosystems. National Science Foundation. 1999-2001.
Cheng, W. (PI) and D.W. Johnson. Rhizosphere processes and soil organic matter decomposition, US Department of Agriculture, National Research Initiative Competitive Grant Program. 1998-2002.
Smith, S.D., J.S. Coleman, R.E. Evans, R. Nowak, W. Cheng (Co-PI), and R.J. Seemann. Effects of elevated CO2 on a Mojave Desert ecosystem. National Science Foundation/TECO. 1998-2001.
Coleman, J.S., W. Cheng (Co-PI), R.D. Evans, Y. Lou, and D.W. Johnson. Exploring the sensitivity of different carbon and nitrogen fluxes to variation in the timing of an ecosystem perturbation. Andrew W. Mellon Foundation. 1998-2000.
Johnson, D.W., W. Cheng (Co-PI) and J.D. Joslin. Effects of elevated CO2 on nutrient cycling in a sweetgum plantation. National Institute for Global Environmental Changes (Southeastern region). 1998-2000.
Johnson, D. W., and W. Cheng. Detecting the effect of elevated CO2 on rhizosphere free-living N2 - fixation using 15N2 - reduction technique. Seed grant, US Department of Energy. 1998-1999.
Cheng, W. (PI) and D.W. Johnson. Effects of elevated CO2 on soil carbon storage. Institute of Innovative Technology for the Earth (Japan). 1996-1998.
Johnson, D.W. and W. Cheng (Co-PI). Ecosystem significance of soil as a long-term sink for anthropogenic additions of N. National Science Foundation. 1997-1999.
Cheng, W. (PI), C.R. Carroll, C.A. Hoffman and D.C. Coleman. In situ rhizosphere processes: respiration, exudation and exudate utilization. National Science Foundation. 1993-1997.