Global Environmental Change and Soil
One area of our research is about the impact of global environmental changes on terrestrial ecosystems, especially the change of CO2 concentration in the atmosphere. We have been investigating the effects of elevated CO2 on belowground processes, including soil microbial activities/biomass, rhizosphere carbon fluxes, nutrient cycling, and soil carbon sequestration both at Oak Ridge FACE (Free-air CO2 Enrichment) site and at the EcoCELLs facility
of the Desert Research Institute. Currently, we are investigating sensitivities
of rhizosphere CO2 efflux to global change factors (e.g., elevated CO2, soil
warming, nitrogen deposition, etc.) in an environmental controlled greenhouse
and a plant growth chamber.
Gershenson, A., N.E. Bader, W. Cheng.
of substrate availability on the temperature sensitivity of soil organic
matter decomposition. Global Change Biology 15:176-183.
Dijkstra, F.A., W. Cheng.
Increased soil moisture content increases plant N uptake and the abundance of
15N in plant biomass. Plant and Soil 302:263-271.
Johnson, D.W., W. Cheng, J.D. Joslin, R.J. Norby, N.T. Edwards, D.E.
Todd, Jr. 2004. Effects of elevated CO2 on nutrient cycling in a
sweetgum plantation. Biogeochemistry 69:379-403.
P.S.J., W. Cheng, D.W. Johnson, D.E. Schorran. 2004. Nonsymbiotic
nitrogen fixation in three-year-old Jeffrey pines and the role of elevated CO2.
Canadian Journal of Forest Research 34:1979-1984.
- Hui, D.,
D.A. Sims, D.W. Johnson, W. Cheng, Y. Luo. 2002. Effects of gradual
versus step increases in carbon dioxide on Plantago photosynthesis and growth
in a microcosm study. Environmental and Experimental Botany 47:51-66.
R.J., P.J. Hanson, E.G. O'Neill, T.J. Tschaplinski, J.F. Welztin, R.T. Hansen,
W. Cheng, S.D. Wullschleger, C.A. Gunderson, N.T. Edwards, D.W.
Johnson. 2002. Net primary productivity of a CO2-enriched deciduous
forest and the implications for carbon storage. Ecological Applications
- Hui, D., Y.
Luo, W. Cheng, J.S. Coleman, D.W. Johnson, D.A. Sims. 2001. Canopy
radiation- and water-use efficiencies as affected by elevated [CO2]. Global
Change Biology 7:75-91.
- Cheng, W.,
D.A. Sims, Y. Luo, D.W. Johnson, J.T. Ball, J.S. Coleman. 2000. Carbon
budgeting in plant-soil mesocosms under elevated CO2: locally
missing carbon? Global Change Biology 6:99-110.
Cheng, W., D.A. Sims, Y. Luo, J. S. Coleman,
D.W. Johnson. 2000. Photosynthesis, respiration, and net primary production of
sunflower stands in ambient and elevated atmospheric CO2
concentrations: an invariant NPP:GPP ratio? Global Change Biology 6:931-942.
Haile-Mariam, S., W. Cheng, D.W. Johnson, E.A. Paul. 2000. Use of
carbon-13 and carbon-14 to measure effects of carbon dioxide and nitrogen
fertilization on carbon dynamics in ponderosa pine. Soil Science Society of
America Journal 64:1984-1992.
D.W., W. Cheng, J.T. Ball. 2000. Effects of [CO2] and N
fertilization on soils planted with ponderosa pine. Plant and Soil 224:99-113.
D.W., W. Cheng, J.T. Ball. 2000. Effects of CO2 and N
fertilization on decomposition and N immobilization in ponderosa pine litter.
Plant and Soil 224:115-122.
Johnson, D.W., W. Cheng,
I.C. Burke. 2000. Biotic and abiotic nitrogen retention in a variety of forest
soils. Soil Science Society of America Journal
- Luo, Y., D.
Hui, W. Cheng, J.S. Coleman, D.W. Johnson, D.A. Sims. 2000. Canopy
quantum yield in a mesocosm study. Agricultural and Forest Meteorology
- Sims, D.A.,
W. Cheng, Y. Luo, J.R. Seemann. 1999. Photosynthetic acclimation to
elevated CO2 in a sunflower canopy. Journal of Experimental Botany
1999. Rhizosphere processes under elevated CO2. In Luo, Y., H.A. Mooney (eds.)
Carbon Dioxide and Environmental Stress, pp. 245-263, Academic Press,
San Diego, CA, USA..
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