Department
of Renewable Resources Tel:
307-766-2494
University
of Wyoming Fax:
307-766-6403
Laramie,
WY 82071 Email:
dgw@uwyo.edu
BA
- 1985 Botany,
The University of Texas, Austin
MS
- 1988 Range
Science, Texas A&M University, College Station
Thesis title: Extent and
ecological significance of physiological integration among ramets within the
bunchgrass Schizachyrium scoparium var. frequens. (Advisor Ð David D. Briske)
PhD
- 1992 Botany,
Washington State University, Pullman
Dissertation title:
Physiological ecology of the invasive grass Pennisetum setaceum on Hawaii. (Advisors Ð Richard
N. Mack and R. Alan Black)
Stable isotope ecology, applied plant ecology, plant
physiological ecology, plant water relations, carbon and water cycles in arid
and semi-arid environments, ecology of plant invasions, global change ecology
2002-present Associate
Professor, Departments of Renewable Resources and Botany,
University
of Wyoming
2002-present Adjunct
Associate Professor, School of Renewable Resources,
University
of Arizona
2002-present Director,
University of Wyoming Stable Isotope Facility,
University
of Wyoming
2002-2003 Fulbright
Research Fellow, Centre dÕEtudes Spatiales de la Biosphere,
Toulouse,
France
2001-2002 Associate
Professor, School of Renewable Natural Resources,
University
of Arizona
1995-2001 Assistant
Professor, School of Renewable Natural Resources,
University
of Arizona
1993-1995
Postdoctoral
Research Fellow, Department of Biology, University of Utah
1988-1992 Teaching/Research
Assistant, Departments of Botany and Biology,
Washington
State University
1985-1988 Teaching/Research
Assistant, Departments of Range Science and Biology,
Texas
A&M University
Honors and Awards
Phi
Kappa Phi, 1988
Sigma
Xi Graduate Research Award, 1990
Biddulph
Graduate Student Fellowship in Botany, Washington State University, 1991
United
States Department of Agriculture, National Research Initiative Competitive
Grants Program, New Investigator Award, 1996
United
States Department of Agriculture, Group Honor Award for Excellence, 2001
Fulbright
Research Scholar Award for France, 2002-2003
Professional
society memberships
Ecological
Society of America
American
Geophysical Union
Society
for Range Management
Williams, D.G. Water use along a semi-arid riparian continuum.
USDA-NRI, $97,242, 1996-1999.
Williams, D.G. Effect of grass invasion on soil carbon and nitrogen
dynamics. University of Arizona Faculty Small Grant Program, $5,000, 1996-1997.
Williams, D.G. Alien grass invasion and ecosystem feedbacks in
southern Arizona. Agricultural Experiment Station/Hatch. $38,640, 1996-1999.
Goodrich, D., D. Cooper, J.L. Dwyer, L. Hipps, T. Maddock, III, S.
Moran., D.E. Myers, E. Njoku, J. Schieldge, D.I. Stannard, and D.G. Williams.
Water resources management to sustain growth and riparian biodiversity: In-situ
and remote measurements of riparian corridor evapotranspiration. NASA, $154,372,
1996-1998.
McPherson, G., M. McClaran, and D.G. Williams. An interactive
computer instructional environment for interrelated courses. University of
Arizona Teaching Center, $5,400, 1997-1998.
Leavitt, S., M.J. Ottman, A.D. Matthias, T.L. Thompson, D.G.
Williams, and R.L. Roth. Elevated CO2 and limited water supply
effects on carbon processes and sequestration in C4 grass. USDA-NRI,
$505,700, 1997-2000.
Williams, D.G. Isotopic indicators of CO2 and H2O
fluxes in semi-arid ecosystems. University of Arizona Research Development
Funds competitive grant; $20,000, 1998-2000.
Leavitt, S. and D.G. Williams. Visiting scholar fund for the
Institute for the Study of Planet Earth. University of Arizona, $1,312, 1998.
Goodrich, D. and D.G. Williams. Ephemeral channel deep recharge and
evapotranspiration from near-channel vegetation. Cochise County, AZ, $70,163,
1998-2000.
Williams, D.G., K. Hultine, D.G. Goodrich. Isotope biohydrology of
an ephemeral drainage. USGS/Water Resources Research Center competitive grant,
$13,724, 1999-2000.
Webb, R.H., D. Meko, and D.G. Williams. Surface water/groundwater
dependence of riparian trees: A synthetic dendrohydrology and ecophysiology
study. USGS-Groundwater Project, $150,000, 1999-2002.
Williams, D.G., D.L. Dettman, S.W. Leavitt, T.A. Markow, C.M. del
Rio. An isotope ratio mass spectrometer for the biological sciences at the
University of Arizona. NSF, $189,000, 2000-2001.
Weltzin, J., and D.G. Williams. Climate change, grass invasions, and
woody plant dynamics in semi-arid savannas. USDA-NRI, $300,000, 2000-2003.
Williams, D.G. Interactions between mesquite and Lehmann lovegrass:
geomorphic controls on plant and soil water balance. Agricultural Experiment
Station/Hatch, $18,000, 2000-2003.
Williams, D.G. Integrated measurement and modeling of
hydro-ecological resources in Morocco. $4,885, University of Arizona Faculty
Small Grant Program, 2001-2002.
Goodrich, D., R. Scott, D.G. Williams, N. Grimm, M. Conklin, and J.
Stromberg. San Pedro Riparian National Conservation Area Water Needs Study.
$823,894, BLM-Upper San Pedro Partnership, 2001-2005.
Williams, D.G., D. Goodrich, R. Scott, and G. Lin. Relationship
between hydrologic condition and plant transpiration and carbon exchange.
$109,190 (year 1). 2001-2003. NSF-SAHRA Science and Technology Center.
Williams, D.G. Integrated measurement and modeling of
hydro-ecological resources in semi-arid regions. $22,000. Fulbright Scholar
Program, France. 2002-2003.
Williams, D.G. and S.E. Williams. Collaborative Isotopic Studies in
Steppe Ecosystems of Inner Mongolia and Wyoming. $1,500. University of Wyoming,
College of Agriculture Global Perspectives Grant. 2004.
Williams, D.G. Net
carbon exchange and evapotranspiration in sagebrush steppe: response to extreme
summer rainfall events. $8,000. Wyoming NASA Space Grant Consortium. 2004.
Williams, D.G. Collaborative Isotopic Studies in Steppe Ecosystems
of Inner Mongolia and Wyoming. $1,035. University of Wyoming International
Program Travel Grant. 2004.
Williams, D.G.,
M. Ben-David, R.O. Hall, C. Martinez del Rio and E. Pendall. Isotope ratio mass
spectrometers for biological and environmental research and training at the
University of Wyoming. $409,042 total, $270,042 external. NSF (DBI-0400752).
2004-2005.
Williams, D.G. Collaborative Research: Sensitivity of ecosystem processes to
precipitation across a grassland to shrubland vegetation transition in the
southwestern US. $224,000. NSF (DEB-0414680). 2004-2007.
Williams, D.G. Collaborative Research: Vulnerability of semi-arid
grasslands to encroachment by woody plants: the role of grass invasions,
seasonal precipitation, and soil type. $109,496. NSF (DEB-0417228). 2004-2007.
Williams, D.G. Travel Grant for BASIN
Williams, D.G. and E. Pendall. How will grassland ecosystems respond
to rising CO2 and climate change? $130,000. USDA-ARS subcontract
cooperative agreement. 2004-2009.
Sharma, S. and D.G. Williams. Volcanic degassing in Yellowstone
National Park: An un-tapped research opportunity for studying effects of
elevated CO2 on coniferous forest. $7,500. University of Wyoming
Faculty Grant-in-Aid. 2006-2007.
Publications
(*students and
postdocs mentored by Williams)
Book chapters
Ehleringer, J.R., R.D. Evans,
and D. Williams. 1998. Assessing sensitivity to change in desert ecosystems - a
stable isotope approach. Pages 223-237.
In H. Griffiths (ed.), Stable Isotopes Integration of Biological,
Ecological, and Geochemical Processes. BIOS
Scientific Publ., Oxford.
Williams, D.G., G.R. McPherson,
and J.F. Weltzin. 1999. Stress in Wildland plants: Implications for ecosystem
structure and function. Pages 907-929.
In M. Pessarakli (ed.). Handbook of plant and crop stress: second
edition. Marcel
Dekkar, Inc., New York.
Williams, D.G. and K.A. Snyder.
2003. Responses of woody plants to heterogeneity of soil water in arid and
semiarid environments. Pages 28-46. In J. Weltzin and G. McPherson (eds), Changing
precipitation regimes and terrestrial ecosystems. University of Arizona Press,
Tucson.
Goodrich, D.C., D.G.
Williams, C.L. Unkrich, J.F. Hogan, R.L. Scott, K.R. Hultine, D. Pool,
A.L. Coes, and S. Miller. 2004. Comparison of methods
to estimate ephemeral channel recharge, Walnut Gulch, San Pedro River Basin, Arizona, In Groundwater Recharge in a
Desert Environment: The Southwestern
United States, edited by J.F. Hogan, F.M. Phillips, and B.R.
Scanlon, Water Science and Applications Series, vol. 9, American Geophysical Union, Washington, D.C., pp. 77-99.
*Yepez E.A. and D.G. Williams. Precipitation pulses and ecosystem carbon and water exchange in arid and semiarid environments. In Biophysical plant ecology: perspectives and trends, ed. E. de la Barrera. UC Press, Berkeley CA. (submitted).
Williams, D.G. and R. Scott. Vegetation-hydrology interactions: Dynamics of riparian plant water use along the San Pedro River, Arizona. In Stromberg, J. and B. Tellman (eds) Riparian area conservation and ecology in a semi-arid region: the San Pedro River example. (in press).
Williams, D.G., R.D. Evans and J.R. Ehleringer. Applications of stable isotope measurements for early-warning detection of ecological change. In T.E. Dawson and R. Siegwolf (eds), Isotopes as tracers of ecological change. Elsevier Academic Press. (in review).
Hemming, D., N. Loader, A. Marca , I. Robertson, D. Williams, L. Wingate, D. Yakir. The future of large-scale isotope networks. In T.E. Dawson and R. Siegwolf (eds), Isotopes as tracers of ecological change. Elsevier Academic Press. (in review).
Refereed journal articles
Williams, D.G. and D.D. Briske.
1991. Size and ecological significance of the physiological individual in the
bunchgrass Schizachyrium scoparium. Oikos 62:41-47.
Williams, D.G. and R.A. Black.
1993. Phenotypic variation in contrasting temperature environments: Growth and
photosynthesis in Pennisetum setaceum from different altitudes on Hawaii. Functional
Ecology
7:623-633.
Williams, D.G. and R.A. Black.
1994. Response to drought for a native and introduced Hawaiian grass. Oecologia 97:512-519.
Williams, D.G., Mack, R.N. and
R.A. Black. 1995. Ecophysiology and growth of introduced Pennisetum setaceum on Hawaii: The role of
phenotypic plasticity. Ecology 76:1569-1580.
Williams, D.G. and R.A. Black.
1996. Resource limitations to growth and gas exchange for introduced Pennisetum
setaceum on
Hawaii. Canadian Journal of Botany 74:268-265.
Williams, D.G. and J.R.
Ehleringer. 1996. Carbon isotope discrimination in three semi-arid woodland
species along a monsoon gradient. Oecologia 106:455-460.
Linton, M.J., J.S. Sperry, and
D.G. Williams. 1998. Xylem cavitation in roots and branches of Juniperus
osteosperma and
Pinus edulis.
Functional Ecology
12:906-911.
Williams, D.G. and J. R.
Ehleringer. 2000. Carbon isotope discrimination and water relations of oak
hybrid populations in southwestern Utah. Western North American Naturalist 60:121-129.
Cooper, D.I., W.E. Eichinger, L.
Hipps, J. Kao, J. Reisner, S. Smith, *S.M. Schaeffer, and D.G. Williams. 2000.
Spatial and temporal properties of water vapor and flux over a riparian canopy.
Agricultural and Forest Meteorology 105:161-183.
Goodrich, D.C., A. Chehbouni, B.
Goff, B. MacNish, T. Maddock, S. Moran, W.J. Shuttleworth, D.G. Williams et al.
2000. Preface paper to the Semi-Arid Land-Surface-Atmosphere (SALSA) program
special issue. Agricultural and Forest Meteorology 105:3-19.
Goodrich, D.C., R. Scott, J. Qi,
B. Goff, C.L. Unkrich, M.S. Moran, D.G. Williams, *S. Schaeffer, *K. Snyder, R.
MacNish, T. Maddock, D. Pool, A. Chehbouni, D.I. Cooper, W.E. Eichinger, W.J.
Shuttleworth, Y. Kerr, R. Marsett, and W. Ni. 2000. Seasonal estimates of
riparian evapotranspiration using remote and in-situ measurements. Agricultural and Forest Meteorology 105:281-309.
*Schaeffer, S.M., D.G. Williams,
and D.C. Goodrich. 2000. Transpiration in cottonwood/willow forest patches
estimated from sap flux. Agricultural and Forest Meteorology 105:257-270.
*Snyder, K. and D.G. Williams.
2000. Water sources used by riparian trees varies among stream types on the San
Pedro river, Arizona. Agricultural and Forest Meteorology 105:227-240.
Williams, D.G. and J. R.
Ehleringer. 2000. Intra- and interspecific variation for summer precipitation
use in pinyon-juniper woodlands. Ecological Monographs 70:517-537.
Williams, D.G. and Z. Baruch.
2000. African grass invasion in the Americas: ecosystem consequences and the
role of ecophysiology. Biological Invasions. 2:123-140.
Wall, G.W., T.J. Brooks, N.R.
Adam, A. Cousins, B.A. Kimball, P.J. Pinter, Jr, R.L. LaMorte, J. Triggs, M.J.
Ottman, S.W. Leavitt, A.D. Matthias, D.G. Williams, and A.N. Webber. 2001.
Elevated atmospheric CO2 improved sorghum plant water status by
ameliorating the adverse effects of drought. New Phytologist 152:231-248.
Weltzin, J.F., *K.A. Snyder, and
D.G. Williams. 2001. Changes in precipitation seasonality and oak (Quercus) recruitment: linking physiology
and demography. Western North American Naturalist 61:463-472.
Williams, D.G., *V. Gempko, *A.
Fravolini, S.W. Leavitt, G.W. Wall, B.A. Kimball, P.J. Pinter Jr., R. LaMorte,
and M. Ottman. 2001. Carbon isotope discrimination by Sorghum bicolor under CO2 enrichment
and drought. New Phytologist 150:285-293.
*Fravolini, A., D.G. Williams,
and T.L. Thompson. 2002. Carbon isotope discrimination and bundle sheath
leakiness in three C4 subtypes grown under variable nitrogen, water
and atmospheric CO2 supply. Journal of Experimental Botany 53:2261-2269.
Brooks, J.R., N. Buchmann, S.
Phillips, B. Ehleringer, R. Evans, L.A. Martinelli, W.T.
Pockman, D. Sandquist, J.P. Sparks, L. Sperry, D.G. Williams, and J.R.
Ehleringer. 2002. Heavy and light beer: a carbon isotope approach to detecting
C4 carbon in beers of different origins, styles and prices. Journal
of Agricultural & Food Chemistry 50:6413-6418.
Scott, R.L., C. Watts, J. Garatuza, E. Edwards, D.C. Goodrich, D.G. Williams, and W.J. Shuttleworth. 2003. The understory and overstory partitioning of energy and water fluxes in a semi-arid woodland ecosystem. Agricultural and Forest Meteorology 114:127-139.
*Hultine, K.L., *W.L. Cable,
S.S.O. Burgess, and D.G. Williams. 2003. Hydraulic redistribution by deep roots
of a Chihuahuan desert phreatophyte. Tree Physiology 23:353-360.
*Hultine, K., D.G. Williams, S.S.O. Burgess, and T.O. Keefer. 2003. Hydraulic redistribution and diurnal storage capacitance in desert phreatophytes. Oecologia 135:167-175.
*Snyder, K.A., and D.G.
Williams. 2003. Experimental defoliation differentially alters water uptake by
deep and shallow roots of Prosopis velutina (velvet mesquite). Functional
Ecology
17:363-374.
*Yepez, E.A., D.G. Williams, R. Scott, and G. Lin. 2003. Partitioning overstory and understory evapotranspiration in a semi-arid savanna ecosystem from the isotopic composition of water vapor. Agricultural and Forest Meteorology 119:53-68.
Weltzin, J.F., M.E.
Loik, S. Schwinning, D.G. Williams, P. Fay, B. Haddad, J. Harte, T.E. Huxman,
A.K. Knapp, G. Lin, W.T. Pockman, M.R. Shaw, E. Small, M.D. Smith, S.D. Smith,
D.T. Tissue, and J.C. Zak. 2003. Assessing the response of terrestrial
ecosystems to potential changes in precipitation. BioScience 53:941-952.
*Potts, D.L. and D.G. Williams.
2004. Response of tree ring Holocellulose d13C to moisture
availability in Populus fremontii at perennial and intermittent
stream reaches. Western North American Naturalist 64:27-37.
Huxman T.E., M.D. Smith, P.A.
Fay, A.K. Knapp, M.R. Shaw, M.E. Loik, S.D. Smith, D.T. Tissue, J.C. Zak, J.F.
Weltzin, W.T. Pockman, O.E. Sala, B. Haddad, J. Harte, G.W. Koch, S.
Schwinning, E.E. Small, and D.G. Williams. 2004. Precipitation and production:
convergence across biomes to a common rain-use efficiency. Nature 429:651-654.
Guerenstein, P.G., *E.A. Yepez,
J. van Haren, D.G. Williams, J.G. Hildebrand. 2004. Floral CO2
emission may indicate food abundance to nectar-feeding moths. Naturwissenschaften 91:329-333.
*Hultine, K.R., R.L. Scott,
*W.L. Cable, and D.G. Williams. 2004. Hydraulic redistribution by a dominant,
warm-desert phreatophyte: seasonal patterns and response to precipitation
pulses. Functional Ecology 18:530-538.
Williams, D.G., *W. Cable, *K.
Hultine, J.C.B. Hoedjes, *E. Yepez, V. Simonneaux,
S. Er-Raki, G. Boulet, H.A.R. de Bruin, A. Chehbouni,
O.K. Hartogensis and F. Timouk. 2004. Components of evapotranspiration
determined by stable isotope, sap flow and eddy covariance techniques. Agricultural
and Forest Meteorology 125:241-258.
Huxman, T.E., J.M. Cable, D.D.
Ignace, J.A. Eilts, *N.B. English, J. Weltzin, and D.G. Williams. 2004.
Response of net ecosystem gas exchange to a simulated precipitation pulse in a
semi-arid grassland: the role of native and non-native grasses and soil
texture. Oecologia
141:295-305.
*Salo, L.F., G.R.
McPherson, and D.G. Williams. 2005. Sonoran Desert winter annuals affected by
density of red brome and soil nitrogen. The American Midland Naturalist 153:95-109.
*English, N.B, J.F. Weltzin, *A.
Fravolini, L. Thomas, D.G. Williams. 2005. The
influence of soil texture and vegetation on soil moisture under rainout
shelters in a semi-desert grassland. Journal of Arid Environments 63:324-343.
Williams, D.G., J.
Coltrain, M. Lott, *N. English, and J.R. Ehleringer. 2005.
Oxygen isotopes in cellulose identify source water for archeological maize in
the American Southwest. Journal of
Archaeological Science
32:931-939.
*Fravolini, A., *K. Hultine, E.
Brugnoli, *R. Gazal, *N. English and D.G. Williams. 2005. Precipitation pulse
use by an invasive woody legume: the role of soil texture and pulse size. Oecologia 144:618-627.
Pendall, E., D.G. Williams and
S.W. Leavitt. 2005. Seasonal and diurnal variations in pinon pine leaf water
isotopic enrichment across a summer moisture gradient. Oecologia 145:605-618.
Ferrio,
J.P., V. Resco, D.G. Williams, L. Serrano, J. Voltas. 2005. Stable isotopes in arid and
semi-arid forest systems. Investigaci—n Agraria. Sistemas y Recursos Forestales Monogr‡fico, 1-12.
Potts, D.L., T.E. Huxman, B.J.
Enquist, J. Weltzin and D.G. Williams. 2005. Resilience and resistance of
ecosystem functional response to a precipitation pulse in a semi-arid
grassland. Journal of Ecology 94:23-30.
*Yepez,
E.A., T.E. Huxman, D.D. Ignace, *N.B. English, J.F. Weltzin, A.E. Castellanos
and D.G. Williams. 2005. Dynamics
of transpiration and evaporation following a moisture pulse in semiarid
grassland: a chamber-based isotope method for partitioning flux components. Agricultural
and Forest Meteorology 132:359-376.
*Hultine K.R., *D.F. Koepke,
W.T. Pockman , *A. Fravolini, J.S. Sperry and D.G. Williams. 2006. Influence of
soil texture on hydraulic properties and water relations of a dominant
warm-desert Phreatophyte. Tree Physiology
26:313-323.
Scott, R.L., T.E. Huxman, D.G.
Williams, D.C. Goodrich. 2006. Ecohydrological impacts of woody plant
encroachment: seasonal patterns of water and carbon dioxide exchange within a
semiarid riparian environment. Global Change Biology 12:311Ð324.
*Gazal,
R., R.L. Scott, D.C. Goodrich and D.G. Williams. 2006. Controls on
transpiration in a desert riparian cottonwood forest. Agricultural and
Forest Meteorology 137:56Ð67.
Potts,
D.L., T.E. Huxman, J.M. Cable, N.B. English, D.D. Ignace, J.A. Eilts, M.J.
Mason, J.F. Weltzin and D.G. Williams. 2006. Antecedent moisture and seasonal
precipitation influence response of canopy-scale carbon and water exchange to
rainfall pulses in semi-arid grassland. New Phytologist doi:10.1111/j.1469-8137.2006.01732.x.
Williams, D.G., T.E. Huxman, R.L. Scott, D.
Goodrich and G. Lin. 2006. Sensitivity of riparian ecosystems in arid
and semiarid environments to moisture pulses. Hydrological Processes (in press).
Potts, D.L., R.L. Scott, D.G. Williams, D.C. Goodrich and T.E. Huxman. The sensitivity of ecosystem carbon exchange to seasonal precipitation and woody plant encroachment. Oecologia (in press).
Other articles
Hipps, L. E., D. Cooper, W.
Eichinger, D. Williams, et al. 1998. A summary of processes which are connected
to evaporation of riparian and heterogeneous upland vegetation in arid regions.
Pages 13-17, In Wood, E.F., Chehbouni, A.G., Goodrich, D.C., Seo, D.J.,
Zimmerman, J.R., eds., Proceedings from the special symposium on hydrology:
Boston, Mass., American Meteorological Society, Boston, Massachusetts.
Maddock III, T., R.D. MacNish,
D.C. Goodrich, D.G. Williams, W.J. Shuttleworth, et al. 1998. The overview of
atmospheric and surface water coupling to regional groundwater models in
semi-arid basins. Pages 38-42, In Wood, E.F., A.G. Chehbouni, D.C. Goodrich,
D.J. Seo, and J.R. Zimmerman, technical coordinators. Proceedings from the
Special Symposium on Hydrology. American Meteorological Society, Boston,
Massachusetts.
Moran, S., D. Williams, D.
Goodrich, A. Chehbouni et al. 1998. Overview of remote sensing of semi-arid
ecosystem function in the upper San Pedro river basin. Pages 49-54, In Wood,
E.F., A.G. Chehbouni, D.C. Goodrich, D.J. Seo, and J.R. Zimmerman, technical
coordinators. Proceedings from the Special Symposium on Hydrology. American
Meteorological Society, Boston, Massachusetts.
Qi, J., M.S. Moran, D.C. Goodrich, R. Marsett, R. Scott, A. Chehbouni, S. Schaeffer, J. Schieldge, D. Williams, T. Keefer, D. Cooper, L. Hipps, W. Eichinger, and W. Ni. 1998. Estimation of evapotranspiration over the San Pedro riparian area with remote and in situ measurements. Pages 55-60, In Wood, E.F., A.G. Chehbouni, D.C. Goodrich, D.J. Seo, and J.R. Zimmerman, technical coordinators. Proceedings from the Special Symposium on Hydrology. American Meteorological Society, Boston, Massachusetts.
*Schaeffer, S., and D.G.
Williams. 1998. Transpiration of desert riparian forest canopies estimated from
sap flux. Pages 180-184, In Wood, E.F., A.G. Chehbouni, D.C. Goodrich, D.J.
Seo, and J.R. Zimmerman, technical coordinators. Proceedings from the Special
Symposium on Hydrology. American Meteorological Society, Boston, Massachusetts.
*Snyder, K.A., D.G. Williams,
and V.L. Gempko. 1998. Water source determination for cottonwood, willow and
mesquite in riparian forest stands. Pages 185-188, In Wood, E.F., A.G.
Chehbouni, D.C. Goodrich, D.J. Seo, and J.R. Zimmerman, technical coordinators.
Proceedings from the Special Symposium on Hydrology. American Meteorological
Society, Boston, Massachusetts.
Williams, D.G., J.-P. Brunel, S.M. Schaeffer, and K.A. Snyder. 1998. Biotic controls over the functioning of desert riparian ecosystems. Pages 43-48, In Wood, E.F., A.G. Chehbouni, D.C. Goodrich, D.J. Seo, and J.R. Zimmerman, technical coordinators. Proceedings from the Special Symposium on Hydrology. American Meteorological Society, Boston, Massachusetts.
Williams, D.G. 1999. The roots
of grass success. BioScience 49:667-670. Book review of Population biology of
grasses by G.P.
Cheplick (ed.).
Matthias, A.D., S.W. Leavitt,
T.L. Thompson, B.A. Kimball, P.J. Pinter Jr, G.W. Wall, R.S. Rauschkolb, M.J.
Ottman, R.L. Roth, T.J. Brooks, N.R. Adam, R.L. LaMorte, G. Weschsung, F.
Weschung, F.J. Adamsen, D.G. Williams, F.S. Nakayama, D.J. Hunsacker, J.
Watson, S.A. White, J.T. Welzmiller. 2001. Free-air CO2 enrichment
effects on wheat and sorghum at Maricopa, Arizona, USA. In Carbon dioxide and
vegetation: advanced international approaches for absorption of CO2
and responses to CO2 -The 13th Global Environment
Tsukuba-, CGER-I046-2001, CGER/NIES.
*Fravolini, A., K.R. Hultine, D.F. Koepke, and D.G. Williams. 2003. The role of soil texture on mesquite water relations and response to summer precipitation. In: Santa Rita Experimental Range: One Hundred Years (1903 to 2003) of accomplishments and contributions; conference proceedings; 2003 October 30 - November 1, Tucson, AZ. Proc. RMRS-P-00. Ogden, UT: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station.
*English, N.B., D.G. Williams, and J.F. Weltzin. 2003. Dynamics of soil temperature and moisture following experimental irrigation on the Santa Rita Experimental Range. In: Santa Rita Experimental Range: One Hundred Years (1903 to 2003) of accomplishments and contributions; conference proceedings; 2003 October 30 - November 1, Tucson, AZ. Proc. RMRS-P-00. Ogden, UT: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station.
Weltzin, J.F. and D.G. Williams.
2003. Isotopes for Ecosystems. Editorial on ÒTracing changes in ecosystem
function under elevated CO2Ó by Pataki et al. BioScience 53:795.
Goodrich, D.C., D.G. Williams,
C.L. Unkrich, R.L. Scott, *K.R. Hultine, D. Pool, A. Coes, and J. Hogan. 2003.
Ephemeral channel recharge and evapotranspiration from near-channel vegetation.
Proceedings of Research in the Watersheds Conference.
50th anniversary of Walnut Gulch, USDA-ARS.
Williams, D.G. 2005.
Isotopes reveal
sources and sinks of trace gases. Book review of Stable isotopes and
biosphere-atmosphere interactions by Larry Flanagan, Jim Ehleringer and Diane Pataki (eds).
Ecology
86:3131-3132.
Williams, D.G. 2005.
Book review of Ecohydrology of water-controlled ecosystems: soil
moisture and plant dynamics by Ignacio
Rodr’guez-Iturbe and Amilcare Porporato. Eos,
Transactions of the American Geophysical Union 86:344.
Scott, R.L., D. Williams, D.
Goodrich, W. Cable, L. Levick, R. McGuire, R. Gazal, E. Yepez, P. Ellsworth and
T. Huxman. 2006. Determining the riparian groundwater use within the San Pedro
Riparian National Conservation Area and the Sierra Vista Sub-Basin, Arizona. In
Hydrologic Requirements of and Consumptive Ground-Water Use by Riparian
Vegetation along the San Pedro River, Arizona. Compiled by J.M. Leenhouts, J.C. Stromberg, and
R.L. Scott. U.S. Geological Survey Scientific Investigations Report.
Significant reports
Scott, R.L., D.C. Goodrich, L. Levick, R. McGuire, W. Cable, D.G. Williams, R. Gazal, E. Yepez, P Ellsworth and T. Huxman. 2004. San Pedro Riparian National Conservation Area (SPRNCA) water needs study:A research effort funded by the Upper San Pedro Partnership. 79 pp.
Williams, D.G., D. Evans and J. Ehleringer. 2005. On developing a plan for an isotope network within NEON: Report from two BASIN workshops. 30 pp.
Presentations
Invited seminar and symposium
presentations
Williams, D.G. 1992. Plasticity
of growth and photosynthesis in populations of Fountaingrass (Pennisetum
setaceum) from
different elevations on Hawaii. Department of Botany, University of Hawaii at
Manoa.
Williams, D.G. 1994. Use of
summer precipitation in pinyon-juniper woodlands along a summer precipitation
gradient. School of Forestry, Northern Arizona University, Flagstaff.
Williams, D.G. 1996. Water use
by desert plants: monsoons, drought, and response to change. Department of Ecology and Evolutionary
Biology, University of Arizona, Tucson, AZ.
Williams, D.G. and J.R.
Ehleringer. 1996. Use of monsoon precipitation by semi-arid woodland species
along a monsoon gradient. American Association for the Advancement of Science,
Southwestern Region Annual Meeting, Flagstaff, Arizona.
Ehleringer, J.R., R.D. Evans and
D.G. Williams. 1996. Sensitivity to change in aridland ecosystems. Symposium:
Stable isotopes and the integration of biological, ecological and geochemical
processes. Newcastle, UK.
Williams, D.G. 1996. Water use by
desert plants: monsoons, drought, and response to change. Department of Biology, University of
Arkansas, Fayetteville, AR.
Williams, D.G. 1997. Plant
functional attributes in southwestern savannas: Can we generalize? Symposium:
Natural and anthropogenic influences on savanna ecosystems of the arid
southwest. Ecological Society of America Annual Meeting, Albuquerque, New
Mexico.
Williams, D.G. 1997. Water use
by desert plants: monsoons, drought, and response to change. Universidad de
Sonora, Hermasillo, Mexico.
Williams, D.G. 1997. Water use
by desert plants: monsoons, drought, and response to change. Department of Biology, Boise State
University, Boise, ID.
Williams, D.G., D.R. Sandquist,
and Z. Baruch. 1998. Ecophysiological processes related to invasion and
ecosystem dominance by African C4 grasses. Symposium: Biotic
invasions: a global perspective. VII International Congress of Ecology,
Florence, Italy.
Williams, D.G. 1998. Sources of
water used by desert riparian trees: The root causes. Department of Plant
Sciences, University of Arizona, Tucson, AZ.
Williams, D.G. 1999. Regulation
of the hydrologic cycle by plants: The root causes. Department of Plant Biology, Arizona State University,
Tempe, AZ.
Williams, D.G. 2000. Root system
dynamics and resource patchiness in semi-arid ecosystems. Department of Ecology
and Evolutionary Biology, University of Tennessee, Knoxville, TN.
Williams, D.G. 2002. Precipitation pulse use by plants in arid and semiarid environments: an isotopic perspective. Department of Renewable Resources, University of Wyoming, Laramie, WY.
Hultine, K.R., W.L. Cable, D.G. Williams, P.Z. Ellsworth, and R.L. Scott. 2002. Transpiration by mesquite on a desert river floodplain. The American Geophysical Union Chapman Conference on Eco-Hydrology of Semiarid Landscapes: Interactions and Processes, Taos, NM.
Williams, D.G. 2002. Precipitation pulse use by plants in arid and semiarid environments. Centre dÕEtudes Spatiales de la Biosphere, Centre National de la Recherche Scientifique, Toulouse, France.
Williams, D.G. 2003. Resource
pulses in arid and semiarid environments: responses from leaf to catchment
scales. Natural Resources Ecology Laboratory, Colorado State University, Ft.
Collins, CO.
Williams, D.G. 2004. Plant ecology meets hydrology - examples from the arid
Southwest. Department of Integrative Biology, The University of Texas,
Austin, TX.
Williams, D.G. and E.A. Yepez.
2004. Tracing sources of evapotranspiration using
stable isotopes: challenges and new opportunities. Invited symposium
presentation; Eco-hydrology. Ecological Society of America annual meeting,
August 3, 2004, Portland, OR.
Williams, D.G. 2004. Eco-hydrology and
hydro-ecology: a synthetic view of vegetation-water interactions in arid
regions. School of Biological Sciences, Washington State University, Pullman,
WA.
Williams, D.G., R.L.
Scott, T.E. Huxman and D.C. Goodrich. 2005. Multi-scale eco-hydrology of
riparian ecosystems in the desert Southwest. Invited symposium presentation;
Ecohydrology: emerging issues. Society for Range Management annual meeting,
February 7, 2005, Fort Worth, TX.
Williams, D.G. 2005.
The use of stable isotopes to investigate dynamics of dryland communities and
ecosystems. Invited symposium presentation; The biology of dryland plants.
Botanical Society of America annual meeting, August 17, 2005, Austin, TX.
Williams, D.G. 2005. Ph