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website on Critical Zone research
Dunham Beldon Jr. Professor of Geology and Natural Sciences
Ph.D. University of Massachusetts
mineralogy, clay and x-ray mineralogy, gems.
Research Interests/Related Travel:
Low temperature geochemistry, clay petrology and mineralogy,
acid rain, lake acidification and forest decline, aluminum biogeochemistry, Critical Zone science.
Research areas include the Smoky, Sierra Nevada, Cascade, White and Adirondack Mountains of the US;
West Germany; Sweden; Norway; Canada; and Australia.
Swedish Natural Science Research Council (NFR) Visiting Scientist Awards (1984-85, 1990-91);
Ten NSF research, curriculum and equipment grants (most recent: 2005-2009 - Calcium Depletion in Adirondack Forests
Affected by Acid Deposition and its Effect on Aquatic and Terrestrial Food Chains);
2008-2011 - Using a Critical Zone Exploration Network to Quantify Controls on Earth's Regolith (NSF - Penn State)
2007-2012 - Regolith and the Critical Zone in the Susquehanna River Basin: The Shale Experiment
Interdisciplinary acid rain research grants from EPRI, EPA, DOE, Oak Ridge National Laboratory and the Swedish
Natural Science Research Council; consultant National Geographic Society, U.S. Geological Survey
(Water Resources Division), Department of Energy.
Recent Publications & Abstracts:
(*indicates student author)
Shale to soil: Geochemistry and clay mineral transformations. R.H. April, S. Lemon* & D. Keller, Mineralogical Magazine, 2011,
Volume 75, Issue 3. Goldschmidt 2011.
Clay mineral weathering in shales and soils in the critical zone, S. MacDonald*, R.H. April and D.M. Keller. Special edition of
Geochimica et Cosmochimica Acta, Volume 74, Issue 11 Supplement 1 (A652), June 2010.
Rasmussen, C., Williams J.Z., Brantley, S., Richter, D., White A., & April, R., 2009, Climatic controls of regolith weathering and mass
flux in granitic terrain – a synthesis of Critical Zone network data, Special Issue of Geohimica et Cosmochimica Acta, Volume 73,
Number 13S (A1074). (Presented at the Goldschmidt Conference, Davos, Switzerland)
R.H. April and A.L. Coplin*, 2008, The isotopic composition of organic carbon in Adirondack Spodosols. Special Issue of Geochimica et
Cosmochimica Acta, Volume 72, Number 12S. (Presented at the Goldschmidt Conference, Vancouver, B.C.)
Hluchy, Michele M., and April, Richard H., 2007, Professional geoscience development for all science teachers:.
Abstracts of the Geological Society of America Annual Meeting, 28–31 October 2007, Denver, Colorado.
April, R.H, Rampe*, E., Kaplan*, J. and Carr, P.F. 2007. Burial and Contact Metamorphism in the Late Permian Broughton
Formation, Sydney Basin, NSW, Australia. In Proceedings of the 12th International Symposium on Water-Rock Interaction,
Bullen, T.D. and Wang, Y. eds., v.1, 53-56. (Presented at the WRI Conference, Kunming, China)
Studying Adirondack watersheds for research and education. M.M. Hluchy, R.H. April, T.S. McCay, and R.L. Fuller, 2006.
Abstracts of the Geological Society of America Annual Meeting, October 22-25, 2006, Philadelphia, Pennsylvania.
April, R.H, Rampe, E., Kaplan, J. and Carr, P.F. 2007. Burial and Contact Metamorphism in the Late Permian
Broughton Formation, Sydney Basin, NSW, Australia. In Proceedings of the 12th International Symposium on
Water-Rock Interaction, Bullen, T.D. and Wang, Y. eds., v.1, 53-56.
April, R. H., Keller, D. M. and Driscoll, C., 2004, Smectite in Spodosols from the Adirondack Mountains of New York. Clay Minerals,
v. 39: 99-113.
Johnson, C. E., Petras, R. J., April, R. H., and Siccama, T. G., 2004, Post-glacial lead dynamics in a forest soil.
Water, Air and Soil Pollution: Focus v. 4: 579-590.
April, R. H., 2003, "Talc" - in the Encyclopedia of Sediments and Sedimentary Rocks,
edited by G. V. Middleton, Kluwer Academic Publishers, Dordrecht, The Netherlands.
Bormann, B. T., Wang, D., Bormann, F. H., Benoit, G. April, R. and Snyder, M. C., 1998, Rapid plant-induced weathering
in an aggrading experimental ecosystem: Biogeochemistry, v. 43, 129-155.
Hyman, M. E., Johnson, C. E., Bailey, S. W., April, R. H., and Hornbeck, J. W. (1998), Chemical weathering and cation loss
in a base-poor watershed: Geol. Soc. Amer. Bull., v. 110, no.1, 85-95.
Benoit, G.,Rozan, T.F. and April, R., 1997, A selective dissolution analysis optimized for measurement of weathering products
in a soil: Soil Sci. Soc. Am. J., v. 61, 949-958.
April, R. H., 1994, An NSF-funded curriculum initiative designed to attract minority students to geology: Journal of Geological
Education, v. 42, no. 5, 447-451.
Richter, D. D., Markewitz, D., Wells, C. G., Allen, H. L., April, R. H., Heine, P. R., and Urrego, B., 1994, Soil chemical
change during three decades in an old-field Loblolly Pine (Pinus Taeda L.) ecosystem: Ecology, v. 75, no. 5, 1463-1473.
April, R. H., and Keller, D., 1992, Saponite and vermiculite in amygdales of the Granby Basaltic Tuff, Connecticut Valley:
Clays and Clay Minerals, v. 40, no. 1, 22-31.
April, R. H., and Newton, R. M., 1992, Mineralogy and Mineral Weathering: in Atmospheric Deposition and Forest Nutrient Cycling,
D. W. Johnson and S. E. Lindberg, eds., Ecological Studies v. 91, pp. 378-425, Springer-Verlag, New York, 707 pp.
Cronan, C., Driscoll, C., Newton, R.M., Kelly, J., Schofield, C., Bartlett, R., and April, R.H., 1990, A comparative analysis
of aluminum biogeochemistry in a northeastern and a southeastern forested watersheds: Water Resources Research , v. 26, no. 7, 1413-1430.
April, R.H., and Keller, D., 1990, Interactions between minerals and roots in forest soils: Sciences Geologiques Mem., no.
85, 89-98, Strasbourg, France.
April, R.H., and Keller, D., 1990, Mineralogy of the rhizosphere in forest soils of the eastern United States: Biogeochemistry, v. 9, 1-18.
Cronan, C.S., April, R.H., Bartlett, R.J., (and others), 1989, Aluminum toxicity in forests exposed to acidic deposition: the
ALBIOS results: Water, Air, and Soil Pollution, v. 48, 181-192.
Kada, J., Heit, M., April, R.H., Miller, K., Keller, D., and Kuiper, J., 1989, Factors influencing the distribution and inventories
of Cs-137 in fresh water lake sediments: Proceedings of the 7th International Conference on Heavy Metals in the Environment, Geneva,
Switzerland, 12-15 September.
Stevens, R., April, R.H., and Wedel, P., 1987, Sediment color and weathered preglacial sources of Quaternary clays, southwestern Sweden:
Geologiska Foreningens i Stockholm Forhandlingar (Journal of the Geol. Soc. of Sweden), v. 109, 241-253.
April, R.H., 1987, Synopsis of soil mineralogy and chemistry in the ILWAS, RILWAS, and ALBIOS watersheds: in "GEOMON-International
Workshop on Geochemistry and Monitoring in Representative Basins," B. Moldan and T. Paces, eds., Geological Survey, Prague, Czechoslovakia, 247-250.
Goldstein, R.,, Gherini, S., Driscoll, C., April, R.H., Schofield, C., and Chen, C., 1987, Lake-watershed acidification in the North
Branch of the Moose River: Introduction: Biogeochemistry, v. 3, nos. 1-3, 5-20 (special issue).
Newton, R.M., Weintraub, J., and April, R.H., 1987, The relationship between surface water chemistry and geology in the North Branch
of the Moose River: Biogeochemistry, v. 3, nos. 1-3, 21-35 (special issue).
April, R.H., Newton, R.M., and Coles, L.T., 1986, Chemical weathering in two Adirondack watersheds: Past and present day rates:
Geological Society of America Bulletin, v. 97, 1232-1238.