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Andrew J. Burton Research Assistant Professor School of Forest Resources and Environmental Science Michigan
Technological University 1400
Townsend Drive Houghton,
MI 49931 Phone: (906) 487-2566 Email: ajburton@mtu.edu |
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Research Interests:
Forest responses to global change factors
Belowground processes
Carbon and nutrient cycling
Physiological ecology of tree roots
Undergraduate involvement in research
Education:
Ph.D. 1997 Forest
Science (Forest Ecology), Michigan Technological
University
M.S. 1986 Forestry (Soils and Hydrology),
Michigan State University
B.S. 1983 Forestry, Michigan State University
Professional Experience:
2003 to present Research Assistant Professor and Lecturer, School of Forest Resources and Environmental Science, Michigan Technological University
2001 to 2003 Research Assistant Professor, School of Forestry and Wood Products, Michigan Technological University.
1994 to 2001 Research Scientist, Forest Ecology Lab, School of Forestry and Wood Products, Michigan Technological University.
1995 Lecturer, School of Natural Resources & Environment, University of Michigan. (Winter Semester only)
1987 to 1994 Research Specialist, Forest Ecology Lab, Department of Forestry, Michigan State University.
1984 to 1986 Graduate Research Assistant, Department of Forestry, Michigan State University.
Awards and Honors:
Certified Senior Ecologist by the
Ecological Society of America
Certified Forester (#3355) by the
Society of American Foresters
Member of honorary societies Sigma
Xi, Phi Kappa Phi, and Xi Sigma Pi
Honored in Who’s Who Among
American Teachers (2004)
Top 10% of MTU instructors on student evaluation
forms (Fall 2003)
Best paper, 1998 Soil Science
Society of America meeting (Division S-7, Session 8)
National Merit Scholar (1979)
Michigan State University Board of
Trustees Award (1983) for placing 2nd out of 1,901 Fall 1983
graduates
Academics and Research
Teaching:
Measuring Forest Resources - FW2050 (Fall Semester, 2000 - present)
Basic Field Ecology Skills - FW2020 (Fall Semester, beginning in 2004)
Hydrology and Watershed Management (Winter Semester 1995, School of Natural Resources & Environment, University of Michigan)
Research
Projects:
Michigan Gradient
Study (Co-PI). 1987 - 2006. Nitrogen (N) saturation of terrestrial
ecosystems is one of the most important contemporary ecological issues. Researchers at Michigan Technological
University and the University of Michigan are adding nitrate (NO3-)
to northern hardwood forests in Michigan to learn how this common Lakes States
forest type responds to chronic N additions.
The Michigan Gradient study was established in 1987 to examine the
effects of climate and atmospheric deposition on ecosystem processes in the
Great Lakes region and continues today with support from NSF. Four northern hardwood study sites extend
500 km from northwestern Upper Michigan to southern Lower Michigan. Since 1994, these study sites have received
experimental N additions (30 kg NO3--N ha-1 y-1),
intended to simulate high levels of chronic atmospheric N deposition. The purpose of this field experiment is to
understand the mechanisms controlling carbon (C) and N cycling in the face of
chronic N deposition and the long-term consequences of N saturation.
The N additions have caused
advanced stages of N saturation to occur in this very common northern hardwood
ecosystem that spans an entire biome in the Great Lakes region of the USA. Current work is designed to elucidate the
mechanisms and consequences of altered ecosystem metabolism resulting from N
saturation. Specifically, increased N
availability is hypothesized to induce an “enzymatic latch”, which decreases
decomposition and enhances C storage in the soil. It is predicted that nitrate (NO3-), dissolved organic carbon
(DOC) and dissolved organic nitrogen (DON) will continue to leach from these
ecosystems, as they have done thus far in response to the NO3-
deposition treatment. These forests may
eventually become totally N saturated, with leaching outputs that equal
simulated atmospheric inputs.
REU Site for Ecosystems in Transition (PI). 2004 - 2006. Ten
Research Experiences for Undergraduates (REU) students will spend the summer at
Michigan Technological University examining Ecosystems in Transition. The students will work with faculty mentors
on existing large-scale, long-term, interdisciplinary experiments examining the
responses of forest ecosystems to climatic variations, anthropogenic pollutants,
changing wildlife populations, exotic species invasions and ecosystem
restoration efforts. During the
ten-week program, each student will also develop and carry out an independent
research project examining a specific aspect of an important environmental
issue. During the second half of the
program, many of the students will spend periods of time off-campus at field
research locations.
In addition to
their research, the REU students will participate in educational training
sessions on experimental design, communicating science to professional and lay
audiences, and ethics in science.
Through a series of Case Study discussions, they also will examine the
role that basic research plays in improving our understanding of ecosystem
function and the development of environmental policy. At the end of the ten-week session, the students will present
their research findings at a symposium sponsored by MTU. The work of all REU students will be
published by MTU, and students will be encouraged to submit their results to
peer-reviewed journals. The REU
students will be able to explore career possibilities through meetings with
invited speakers from universities, government agencies and private industry,
attendance at a national scientific meeting, and a career workshop.
Cross-Site Study:
A cross-biome examination of belowground C allocation (Co-PI). 1997 - 2001. Plants devote considerable
energy to the production and maintenance of small-diameter roots and their
associated mycorrhizal fungi. How this
belowground allocation of carbon responds to environmental variables, such as
temperature and moisture, and to altered availability of resources, such as
nitrogen, is fundamental to our understanding of ecosystem function.
To address these questions,
researchers in the Forest Ecology group at MTU quantified root and soil
respiration, root system architecture, root production and mortality, and
mycorrhizal community composition in ten common North American forest
ecosystems. The research was conducted in
cooperation with co-investigators at the University of Alaska-Fairbanks, the
University of Georgia, and the University of California-Riverside. The study sites represent a wide range of
environmental conditions and spanned several North American biomes. They included flood plain balsam poplar and
white spruce forests at the Bonanza Creek LTER in Alaska; a red pine plantation
and a sugar maple-dominated northern hardwood forest in Michigan; a
pinyon-juniper woodland at the Sevilleta LTER in New Mexico; mixed hardwood,
oak-hickory, and yellow-poplar forests at the Coweeta LTER in North Carolina; a
mixed-oak forest in Central Georgia; and a slash pine plantation in
Florida.
Carbon and Nutrient Cycling
in Olympic National Park (Co-PI). 1998-2002.
This study was a
collaborative research between MTU, the Environmental Protection Agency and the
National Park Service. The project
investigated the influences of climatic variability and N deposition on
belowground indicators of ecosystem integrity in Olympic National Park. Eleven diverse study sites were used to
learn how soil CO2 efflux (soil respiration) and the production of
dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) were
affected by seasonal changes in temperature and moisture availability at a
given location and by climatic differences that existed along mountain
elevation gradients. At seven of the
sites, experimental N additions (1.0 and 2.0 g urea-N m-2 yr-1)
were made to learn how belowground C cycling would respond to increased
availability of this limiting nutrient.
Plot-level results were linked to the larger watershed scale by
examining DOC/DON and ions in streams draining the study areas. In order to gain a more mechanistic
understanding of the factors that might underlie observed responses in soil
respiration and DOC/DON production, soil foodweb dynamics were examined by
using natural abundance isotopic signatures and experimental 15N
tracer additions to examine the flow of C and N into soil microarthropods and
mycorrhizal fungi.
Research Grants:
REU Site for
Ecosystems in Transition: The Role of
Research in Assessing Ecosystem Responses to Changing Environment. 2004-2006.
Sponsored by National Science Foundation. $155,463 (PI).
Nitrogen
saturation: mechanisms and consequences of altered ecosystem metabolism. 2003-2006.
Sponsored by National Science Foundation. $810,000 (co-PI).
Plant-microbe
interactions and the production of dissolved organic carbon and nitrogen. 2000-2004.
Sponsored
by National Science Foundation. $883,480 (co-PI).
The
movement of elements through ecosystems:
major research instrumentation for the integration of research and
education. 2000-2004. Sponsored by National Science Foundation.
$894,130 (co-PI).
Collaborative research on belowground ecosystem function: merging long-term climate monitoring with soil, root and foodweb dynamics to understand mechanisms regulating C and N transformations. 1998-2002. Sponsored by EPA. $387,595 (co-PI).
Factors regulating belowground carbon allocation in terrestrial ecosystems: a cross-site experiment. 1997-2001. Sponsored by National Science Foundation. $261,302 (co-PI).
Cycling of NO3-N
in northern hardwood forests:
regulation and consequences of N saturation. 1996-2000. Sponsored by
National Science Foundation. $690,000 (co-PI).
Research Experiences for Undergraduates (REU) supplements to existing NSF grants for undergraduate summer research projects. 1996-2003. $47,000 in funding for nine students was received. (wrote the supplement requests and helped mentor the students).
Professional Organizations and
Service
Member
of professional societies: Society of
American Foresters, Ecological Society of America, Soil Science Society of
America, and Agronomy Society of America.
Ad-hoc review of research
proposals for NSF and USDA.
Manuscript reviews for: Ecology/Ecological Monographs, New Phytologist,
Global Change Biology, Tree Physiology, Forest Science, Canadian Journal of Forest
Research, Soil Science Society of America Journal, Plant Ecology, Journal of
the Torrey Botanical Society, Plant and Soil, American Midland Naturalist, Forest
Ecology and Management, and The Ohio
Journal of Science.
Editorial Review Board of Tree
Physiology (2000 - 2002).
Presidential Committee on University Safety and Environmental Health, MTU, 1998 – 2004.
Chemical Hygiene Officer, School
of Forest Resources and Environmental Science, MTU, 1998 – 2004.
Publications
Refereed
Journals:
DeForest, J.L., D.R. Zak, K.S. Pregitzer, and A.J.
Burton. 2005. Atmospheric NO3- deposition, declines in
extracellular enzyme activity, and increases in DOC leaching: Test of a potential mechanism. Soil Sci. Soc. Am. J. in press
Zak, D.R., W.E. Holmes, M.J. Tomlinson, K.S.
Pregitzer, and A.J. Burton. 2005. Microbial cycling of C and N in northern
hardwood forests receiving chronic atmospheric NO3-
deposition. Ecosystems in press
Burton, A.J., K.S. Pregitzer, J.N. Crawford, G.P.
Zogg, and D.R. Zak. 2004. Simulated chronic NO3-
addition reduces soil respiration in northern hardwood forests. Global Change Biol. 10:1080-1091.
DeForest,
J.L., D.R. Zak, K.S. Pregitzer, and A.J. Burton. 2004. Atmospheric
nitrate deposition and the microbial degradation of cellobiose and vanillin in
a northern hardwood forest. Soil Biol.
Biochem. 36:965-971.
Deforest,
J.L., D.R. Zak, K.S. Pregitzer, and A.J. Burton. 2004. Atmospheric nitrate deposition,
microbial community composition, and enzyme activity in northern hardwood
forests. Soil Sci. Soc. Am. J. 68:132-138. Abstract
Pregitzer, K.S., D.R. Zak, A.J. Burton, J.A. Ashby,
and N.W. MacDonald. 2004. Chronic nitrate additions dramatically
increase the export of carbon and nitrogen from northern hardwood
ecosystems. Biogeochem. 68:179-197.
Zak, D.R., K.S. Pregitzer, W.E. Holmes, A.J.
Burton, and G.P. Zogg. 2004. Anthropogenic N deposition and the fate of 15NO3-
in a northern hardwood ecosystem.
Biogeochem. 69:143-157.
Burton,
A.J., and K.S. Pregitzer. 2003. Field measurements of root respiration indicate
little to no seasonal temperature acclimation for sugar maple and red pine.
Tree Physiol. 23:273–280. Abstract
Crocker, T.L., R.L. Hendrick, R. Ruess, K.S.
Pregitzer, A.J. Burton, M.F. Allen, J. Shan, and L.A. Morris. 2003.
Substituting root numbers for length:
Improving the use of minirhizotrons to study fine root dynamics. Appl. Soil Ecol. 23:127-135 Abstract
Kane, E.S., K.S. Pregitzer, and A.J. Burton. 2003.
Soil respiration along environmental gradients in Olympic National
Park. Ecosystems 6:326-335.
Abstract
Ruess,
R.W., R.L. Hendrick, A.J. Burton, K.S. Pregitzer, B. Sveinbjornssön, M.F.
Allen, and G.E. Maurer. 2003. Coupling fine
root dynamics with ecosystem carbon cycling in black spruce forests of interior
Alaska. Ecol. Monogr. 73:643-662.
Abstract
Burton, A.J., K.S.
Pregitzer, R.W. Ruess, R.L. Hendrick, and M.F. Allen. 2002. Root respiration in
North American forests: effects of nitrogen
concentration and temperature across biomes.
Oecologia 131:559-568. Abstract
Burton, A.J., and K.S.
Pregitzer. 2002. Measurement carbon dioxide concentration
does not affect root respiration rates of nine tree species in the field. Tree Physiol. 22:67-72. Abstract
Pregitzer,
K.S., J.L. DeForest, A.J. Burton, M.F. Allen, R.W. Ruess, and R.L.
Hendrick. 2002. Fine root architecture of nine North
American trees. Ecol. Monogr. 72:293-309.
Abstract
Brown, S.E., K.S. Pregitzer,
D.D. Reed, and A.J. Burton. 2000. Predicting daily mean soil temperature from
daily mean air temperature in four northern hardwood forest stands. Forest Sci.
46:297-301.
Burton, A.J., K.S.
Pregitzer, and R.L. Hendrick.
2000. Relationships between fine
root dynamics and nitrogen availability in Michigan northern hardwood forests. Oecologia
125:389-399. Abstract
Pregitzer, K.S., J.S. King,
A.J. Burton, and S.E. Brown. 2000. Responses of tree fine roots to
temperature. New Phytol. 147:105-115. Abstract
Zogg, G.P., D.R. Zak, A.J.
Burton, and K.S. Pregitzer. 2000. Microbial immobilization and the retention
of anthropogenic nitrate in a northern hardwood forest. Ecology
81:1858-1866. Abstract
Burton, A.J., K.S.
Pregitzer, G.P. Zogg, and D.R. Zak.
1998. Drought reduces root
respiration in sugar maple forests.
Ecol. Appl. 8:771-778. Abstract
MacDonald,
N.W., J.A. Witter, D.D. Reed, A.J. Burton, K.S. Pregitzer, and H.O.
Liechty. 1998. Environmental stress effects on vigor,
mortality, and growth in northern hardwood forests along a pollution-climate
gradient. Michigan Academician XXX:27-47.
Pregitzer, K.S., M.J.
Laskowski, A.J. Burton, V.C. Lessard, and D.R. Zak. 1998. Variation in sugar maple root respiration
with root diameter and soil depth. Tree
Physiol. 18:665-670. Abstract
Burton, A.J., G.P. Zogg,
K.S. Pregitzer, and D.R. Zak.
1997. Effects of measurement CO2
concentration on sugar maple root respiration.
Tree Physiol. 17:421-427. Abstract
Burton, A.J., K.S.
Pregitzer, G.P. Zogg, and D.R. Zak.
1996. Latitudinal variation in sugar
maple fine root respiration. Can. J.
For. Res. 26:1761-1768.
Zogg, G.P., D.R. Zak, A.J.
Burton, and K.S. Pregitzer. 1996. Fine root respiration in northern hardwood
forests in relation to temperature and nitrogen availability. Tree Physiol. 16:719-725. Abstract
Gross,
K.L., K.S. Pregitzer, and A.J. Burton.
1995. Spatial variation in
nitrogen availability in three successional plant communities. J. Ecol.
83:357-367. Abstract
MacDonald, N.W., A.J.
Burton, J.A. Witter, and D.D. Richter.
1994. Sulfate adsorption in
forest soils of the Great Lakes region.
Soil Sci. Soc. Am. J. 58:1546-1555.
Reed, D.D., K.S. Pregitzer,
H.O. Liechty, A.J. Burton, and G.D. Mroz.
1994. Productivity and growth
efficiency in sugar maple forests. For.
Ecol. and Manage. 70:319-327. Abstract
Burton,
A.J., K.S. Pregitzer, and N.W. MacDonald.
1993. Foliar nutrients in sugar
maple forests along a regional pollution-climate gradient. Soil Sci. Soc. Am. J. 57: 1619-1628.
MacDonald, N.W., J.A.
Witter, A.J. Burton, K.S. Pregitzer, and D.D. Richter. 1993.
Relationships among atmospheric deposition throughfall, and soil
properties in oak forest ecosystems.
Can. J. For. Res. 23:2348-2357.
MacDonald,
N.W., A.J. Burton, H.O. Liechty, J.A. Witter, K.S. Pregitzer, G.D. Mroz, and
D.D. Richter. 1992. Ion leaching in forest ecosystems along a
Great Lakes air pollution gradient. J.
Environ. Qual. 21:614-623.
Pregitzer, K.S., A.J.
Burton, G.D. Mroz, H.O. Liechty, and N.W. MacDonald. 1992. Foliar sulfur and
nitrogen along an 800-km pollution gradient.
Can. J. For. Res. 22:1761-1769.
Burton,
A.J., K.S. Pregitzer, and D.D.
Reed. 1991. Leaf area and foliar biomass relationships in northern hardwood
forests located along an 800 km acid deposition gradient. For. Sci. 37:1041-1059.
Burton, A.J., C.W. Ramm,
K.S. Pregitzer, and D.D. Reed.
1991. Use of multivariate
methods in forest research site selection.
Can. J. For. Res. 21:1573-1580.
MacDonald, N.W., A.J.
Burton, M.F. Jurgensen, J.W. McLaughlin, and G.D. Mroz. 1991.
Variation in forest soil properties along a Great Lakes air pollution
gradient. Soil Sci. Soc. Am. J.
55:1709-1715.
Pregitzer,
K.S., and A.J. Burton. 1991. Sugar maple seed production and nitrogen in
litterfall. Can. J. For. Res. 21:1148-1153.
Burton, A.J., J.B. Hart, and D.H. Urie. 1990.
Nitrification in sludge amended Michigan forest soils. J. Environ. Qual. 19:609-616.
Reed,
D.D., H.O. Liechty, and A.J. Burton.
1989. A simple procedure for
mapping tree locations in forest stands.
For. Sci. 35:657-662.
Theses, Book Chapters and Other Publications:
Burton, A.J. 1998.
Review of “Impact of air pollutants on southern pine forests”, S. Fox
and R.A. Mickler, eds. Quarterly Rev.
Biol. 73:101.
Burton, A.J. 1997.
Sugar maple fine root respiration and longevity along a latitudinal
gradient. Ph.D. dissertation. Michigan
Technological University, Houghton. 104
p.
Reed, D.D., G.D. Mroz, H.O.
Liechty, K.S. Pregitzer, A.J. Burton, D.R. Zak, J.A. Witter, and N.W.
MacDonald. 1994. Studying the effects of air pollution on
forests along exposure gradients:
experiences in the United States and opportunities for cooperation. p. 109-115 In Proceedings of the Conference on Climate and Atmospheric
Deposition Studies in Forests (J. Solon, E. Roo-Zielinska, and A. Byternowicz,
eds.). Nieborow, Poland, October 6-9,
1992. Polish Academy of Sciences.
Burton, A.J., D.H. Urie, and
J.B. Hart. 1987. Nitrogen transformations in four sludge
amended Michigan forest types. p.
142-153 In The forest alternative for
treatment and utilization of municipal and industrial wastes. Univ. of Washington Press, Seattle.
Burton, A.J. 1986.
Nitrogen transformations and nitrate leaching following sludge
application to four Michigan forest types. M.S. thesis, Michigan State
University, E. Lansing. 144 p.
Presentations at Scientific Meetings and
Conferences:
Burton, A.J., and K.S. Pregitzer. 2003.
Root and microbial contributions to soil CO2 efflux in
northern hardwood forests with and without chronic N additions. Presentation and published abstract, annual
meeting of the Soil Science Society of America, Denver, Colorado, Nov. 2-6.
Crawford,
J.N., K.S. Pregitzer, A.J. Burton, and D.R. Zak. 2002. Effect of
experimental N-additions on soil and root respiration in northern hardwood
stands. Presentation
and published abstract, annual meeting of the Ecological Society of America,
Tucson, Arizona, Aug. 5-9.
Eikenberry,
J.R., K.S. Pregitzer, A.J. Burton, and D.R. Zak. 2002. Chronic N effects on root and leaf litter chemistry
of northern hardwood forests. Presentation and published abstract,
annual meeting of the Ecological Society of America, Tucson, Arizona, Aug. 5-9.
Pregitzer, K.S., and A.J. Burton. 2002. The Michigan gradient study – Evaluation of nutrient cycling processes along a gradient of temperature and N deposition. Presentation at the Terrestrial Ecosystem Responses to Atmospheric and Climatic Change (TERACC) workshop: From Transient to Steady State Response of Ecosystems to CO2-Enrichment and Global Warming, Durham, New Hampshire, Apr. 28 – May 1.
Burton, A.J.
2001. Belowground C and N fluxes
along a climatic gradient in Olympic NP.
Presentation at PRIMENet annual meeting, Hawaii Volcanoes National Park,
Nov. 5-8.
Burton, A.J., K.S.
Pregitzer, and K.L. Bradley. 2001. Spatial and temporal variation of soil respiration in a
pinyon-juniper woodland. Poster
presentation and published abstract, annual meeting of the Ecological Society
of America, Madison, Wisconsin, Aug 5-10.
Kane, E.S., K.S. Pregitzer,
and A.J. Burton. 2001. Soil CO2
efflux along a diverse environmental gradient in Olympic National Park,
Washington. Poster presentation and
published abstract, annual meeting of the Ecological Society of America,
Madison, Wisconsin, Aug. 5-10.
Pregitzer, K.S., A.J. Burton, R.W. Ruess, R.L. Hendrick, and M.F. Allen. 2001. Soil temperature, moisture, and nitrogen interact to influence soil respiration in North American forests. Poster presentation and published abstract at the International Geosphere-Biosphere Programme (IGBP) global change open science conference: Challenges of a Changing Earth, Amsterdam, Netherlands, July 10-13.
Burton,
A.J., K.S. Pregitzer, G.P. Zogg, and D.R. Zak.
2000. Northern hardwood soil respiration
after six years of N additions. Poster
presentation and published abstract, annual meeting of the Soil Science Society
of America, Minneapolis, Minnesota, Nov. 5-9.
Burton,
A.J., and K.S. Pregitzer. 2000. Field
measurements of root respiration in sugar maple and red pine forests indicate
no temperature acclimation. Poster presentation and published
abstract, annual meeting of the Ecological Society of America, Snowbird, Utah,
Aug. 6-10.
Burton, A.J., and K.S. Pregitzer. 1999. Fine root respiration
rates in North American forests. Poster
presentation at Sevilleta Research Symposium, Sevilleta National Wildlife
Refuge, New Mexico, January 12-14.
Zogg, G.P.,
D.R. Zak, A.J. Burton, and K.S.
Pregitzer. 1999. Belowground fate and flow of nitrate in a
northern hardwood forest. Presentation
and published abstract, annual meeting of the Ecological Society of America,
Spokane, Washington, Aug. 8-12.
Burton, A.J., and K.S. Pregitzer. 1998. Fine root
respiration rates in North American forests. Poster presentation and published abstract, annual meeting of the
Soil Science Society of America, Baltimore, Maryland, Oct. 18-22.
Burton, A.J. K.S. Pregitzer,
G.P. Zogg, and D.R. Zak. 1997. Belowground carbon allocation in sugar maple
forests with differing nitrogen availability.
Presentation and published abstract, annual meeting of the Soil Science
Society of America, Anaheim, California, Oct. 26-30.
Burton, A.J.,
K.S. Pregitzer, G.P. Zogg, and D.R. Zak.
1997. Drought reduces root
respiration in sugar maple forests.
Presentation and published abstract, annual meeting of the Ecological
Society of America, Albuquerque, New Mexico, Aug. 10-14.
Pregitzer, K.S., M.J. Laskowski, A.J. Burton, and V.C. Lessard. 1997. Variation in northern hardwood root respiration with root diameter and soil depth. Poster presentation and published abstract, annual meeting of the Ecological Society of America, Albuquerque, New Mexico, Aug. 10-14.
Zogg, G.P.,
D.R. Zak, A.J. Burton, and K.S.
Pregitzer. 1996. The contribution of fine roots to carbon
dioxide flux from forest soils.
Presentation and published abstract, annual meeting of the Soil Science
Society of America, Indianapolis, Indiana, Nov. 3-8.
Burton, A.J.,
K.S. Pregitzer, and G.P. Zogg.
1995. Latitudinal variation in
sugar maple fine root respiration. Presentation and published abstract, annual
meeting of the Ecological Society of America, Snowbird, Utah, July 30-Aug. 3.
Burton, A.J., K.S.
Pregitzer, and G.P. Zogg. 1995. Temperature and nitrogen effects on fine
root longevity in sugar maple forests. Presentation and published abstract,
annual meeting of the Soil Science Society of America, St. Louis, Missouri,
Oct. 29-Nov. 3.
Zogg, G.P.,
D.R. Zak, A.J. Burton, and K.S.
Pregitzer. 1995. Patterns of fine-root respiration in
northern hardwood forests in relation to temperature and nitrogen
availability. Presentation and
published abstract, annual meeting of the Ecological Society of America,
Snowbird, Utah, Aug. 6-10 .
Burton, A.J.,
K.S. Pregitzer, and N.W. MacDonald.
1993. Insect defoliation effects
on northern hardwood nutrient cycling. Presentation and published abstract,
annual meeting of the Soil Science Society of America, Cincinnati, Ohio, Nov.
7-12.
MacDonald, N.W., J.A. Witter, A.J.
Burton, K.S. Pregitzer, and D.D. Richter.
1992. Relationships among
atmospheric deposition, throughfall, and soil properties in oak forest
ecosystems. Presentation and published
abstract, annual meeting of the Soil Science Society of America, Minneapolis,
Minnesota, Nov. 1-6.
MacDonald, N.W., A.J. Burton, H.O.
Liechty, G.D. Mroz, and J.A. Witter.
1991. Soil solution chemistry
and ion leaching in northern hardwood forests across an 800 km pollution
gradient. Poster presentation and published abstract at Emerging Issues in
Northern Hardwood Management: Air
Pollution, Climate Change and Biodiversity, Mackinac Island, Michigan, May
20-23.
Pregitzer, K.S., A.J. Burton, G.D. Mroz,
H.O. Liechty, and N.W. MacDonald.
1991. Northern hardwood foliar
stoichiometry across an 800-km pollution gradient. Presentation and published
abstract at Emerging Issues in Northern Hardwood Management: Air Pollution, Climate Change and
Biodiversity, Mackinac Island, Michigan, May 20-23.
MacDonald,
N.W., A.J. Burton, M.F. Jurgensen, and J.W. McLaughlin. 1990.
Variation in soil properties along an air pollution gradient in the
northern Great Lakes region.
Presentation and published abstract, annual meeting of the Soil Science
Society of America, San Antonio, Texas, Oct. 21-26.
Mroz, G., A. Burton, O. Hua,
M. Jurgensen, H. Liechty, N. MacDonald, K. Pregitzer, D. Reed, R. Stottlemyer,
J. Witter, and D. Zak. 1990. Effects of an air pollution gradient on
northern hardwood forests in the northern Great Lakes Region: Part 2 - Nutrient cycling and forest
productivity. Presentation and
published abstract at the NAPAP International Conference, Hilton Head, SC, Feb.
11-16.
Witter, J., G. Mroz, K.
Pregitzer, A. Burton, M. Jurgensen, D. Karnosky, H. Liechty, N. MacDonald, D.
Reed, D. Richter, R. Stottlemyer, and D. Zak.
1990. Effects of an air
pollution gradient on northern hardwood forests in the northern Great Lakes
Region: Part 1 - Overview. Presentation and published abstract at the
NAPAP International Conference, Hilton Head, South Carolina, Feb. 11-16.
Burton, A.J.,
and K.S. Pregitzer. 1989. Specific leaf area and leaf area index in
Great Lakes northern hardwood forests.
Presentation and published abstract, annual meeting of the Ecological
Society of America, Toronto, Ontario, Canada, Aug. 6-10.
Mroz, G.D., D.D. Reed, J.A.
Witter, K.S. Pregitzer, M.F. Jurgensen, H.O. Liechty, A.J. Burton, J.R.
Stottlemyer, N.W. MacDonald, D.R. Zak, and O. Hua. 1989. Effects of an air pollution
gradient on northern hardwood forests in the northern Great Lakes Region: Part 2 - Nutrient cycling and forest
productivity. Poster presentation and
published abstract at International Congress on Forest Decline Research: State of Knowledge and Perspectives, Friedrichshafen, Lake Constance, Federal
Republic of Germany, Oct. 2-6.
Witter, J., G. Mroz, K.
Pregitzer, A. Burton, M. Jurgensen, D. Karnosky, H. Liechty, N. MacDonald, D.
Reed, D. Richter, R. Stottlemyer, and D. Zak.
1989. Effects of an air
pollution gradient on northern hardwood forests in the northern Great Lakes
Region: Part 1 - Overview. Poster presentation and published abstract
at International Congress on Forest Decline Research: State of Knowledge and Perspectives: Friedrichshafen, Lake Constance, Federal Republic of Germany,
Oct. 2-6.
Hendrick,
R.L., K.S. Pregitzer, A.J. Burton, and P.V. Nguyen. 1988. Fine root dynamics
in northern hardwood forests along an acid deposition gradient. Poster
presentation and published abstract, annual meeting of the Soil Science Society
of America, Anaheim, California, Nov. 27-Dec. 2.
Liechty, H., A. Burton, M. Jurgensen, G.
Mroz, K. Pregitzer, D. Reed, D. Richter, R. Stottlemyer, and J. Witter. 1988.
Relationships of throughfall chemistry to precipitation in six northern
hardwood stands along a sulfate deposition gradient. Poster presentation at International Symposium on Acidic
Deposition and Forest Decline, Rochester, New York, Oct. 20-21.
Burton, A.J.,
J.B. Hart, Jr., and D.H. Urie.
1985. Sludge nitrogen form and
acidity effects on nitrogen transformations in Michigan forest soils. Presentation and published abstract, annual
meeting of the Soil Science Society of America, Chicago, Illinois, Dec. 1-6.
Burton, A.,
D. Urie, and J.B. Hart, Jr. 1985. Nitrogen cycling and potential nitrate
groundwater pollution. Presentation and
published summary at Conference on Forest Land Application of Wastewater
Sludge, Grayling, Michigan, Sep. 11-12.
Burton, A.J. 1985.
Nitrogen transformations in four sludge-amended Michigan forest
types. Poster presentation and
published abstract, Forest Land Applications Symposium, Univ. of Washington,
Seattle, June 25-28.
Other Presentations:
Lecture and field presentation on nutrient cycling and
population, community and ecosystem ecology at
the MTU sponsored Program of Advanced Studies in Silviculture for U.S. Forest
Service personnel. Alberta, Michigan,
September 13, 2002.
Burton,
A.J. 2002. Alteration of Belowground Carbon Cycling by Chronic Nitrate
Additions to Northern Hardwood Forests.
Invited presentation to the School of Forest Resources and Environmental
Science, Michigan Technological University, Houghton, Michigan. April 30, 2002.
Gave report
on the MTU School of Forestry and Wood Products’ soils related research
activities at the Michigan Soil Survey Cooperators Meeting. East Lansing, Michigan, March 5, 2002.
Gave field
presentation on NSF Cross-Biome study to the Board of Trustees of the Great
Lakes Forestry Alliance. Atlantic Mine,
Michigan, October 10, 2001.
Field
presentation on the Michigan Gradient Study to attendees of IUFRO’s 19th
International Meeting for Specialists in Air Pollution Effects on Forest
Ecosystems: Air Pollution, Global
Change and Forests in the New Millennium. Twin Lakes, Michigan, May 31, 2000.
Forest
ecology training for Trees for Tomorrow high school students from
Wisconsin. Houghton, Michigan, April
21, 2000.
Lecture on
effects of forest management on soil properties at the MTU sponsored Program of
Advanced Studies in Silviculture for U.S. Forest Service personnel. Alberta, Michigan, October 21, 1999.