Abstract
Our objective is to present a perspective on large-scale natural resource monitoring when cause-effect is a potential issue. We believe that the approach of designing a survey to meet traditional commodityproduction and resource state descriptive objectives is too restrictive and unnecessarily limits theability to investigate cause-effect issues. We only consider terrestrial natural resources, focusing on forests and rangeland. A large institutionalized programme is required to establish cause-effect relationships when monitoring terrestrial resources. This is justified based on the growing concerns about our natural resources. A long-term vision of a desirable future terrestrial monitoring system, realizing that it is not clear yet what key variables should be measured, will increase the chances that decisions on current designs will ultimately lead to better systems in the future. We propose a pronounced shift in the designs applied to forest and range, specifically, the NationalResources Inventory (NRI), the Forest Inventory and Analysis (FIA), and the Forest Health Monitoring (FHM) programmes. The designs must not only address simple status and trends estimation but also give emphasis to identifying interesting changes occurring in the sampled populations thus facilitating identification and establishment of possible cause-effect relationships. We propose an integrated design consisting of a large-scale, long-term ongoing survey as the core design accompanied by supplemental experimental design studies or analytic survey. Continuous inventory involving annual measurement of a subset of the sample from selected populations should be implemented: inventorying a population every five years (as with NRI) or every ten years (as with FIA) is insufficient. FHM, FIA, and NRI should collect a subset of variables in common. Complementarity of data collected would make it more likely to identify promising cause-effect relationships for a wider range of resource variables. At this stage we recommend focusing on the mortality of trees, shrubs, forbs, and grasses as the key indicator of forest and range health. Mortality is objectively measurable and can often be detected by remote sensing. When possible, follow-up observational studies to document cause-effect relationships should be limited to public lands because of concern of infringing on the personal rights of landowners. This may not be possible if unrepresentative populations result because of this. If studies are designed properly, we could achieve our objectives yet tie such studies to current natural resource inventory systems.
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References
Barber, M.C. (ed.) (1994) Environmental Monitoring and Assessment Program: Indicator Development Strategy. EPA/620/R-94/022. US Environmental Protection Agency, Office of Research and Development, Environmental Research Laboratory, Athens, GA.
Barnett, V. and Lewis, T. (1994) Outliers in statistical data. Wiley, New York.
Bechtold, W.A., Ruark, G.A. and Lloyd, F.T. (1991) Changing stand structure and regional growth reductions in Georgia's natural pine stands. Forest Science 37, 703–17.
Birdsey, R.A. and Schreuder, H.T. (1992) An overview of forest inventory and analysis estimation procedures in the eastern U.S.-with an emphasis on components of change. RM Tech. Rep. RM-214, USDA Forest Service Rocky Mountain Forest and Range Experiment Station, Ft Collins, CO.
CENR (1996) Integrating the Nation's environmental monitoring and research networks and programs: A proposed framework. National Science and Technology Council, Committee on Environment and Natural Resources, Environmental Monitoring Team, Washington, DC.
Cochran, W.G. (1983) Planning and analysis of observational studies. Wiley, New York.
Feinstein, A.R. (1988) Scientific standards in epidemiologic studies of the menace of daily life. Science, 242, 1257–63.
FHM (1994a) Forest Health Monitoring: A National Strategic Plan. US Department of Agriculture, Forest Service, Forest Health Monitoring Program, Research Triangle Park, NC.
FHM (1994b) National Forest Health Monitoring Program. US Department of Agriculture, Forest Service, Forest Health Monitoring Program, Research Triangle Park, NC.
Goebel, J.J. and George, T.A. (1990) Establishing a consistent national base for assessing natural resource issues. In Proc. 30th International Atlantic Economic Conference, Williamsburg, VA, October 11–14.
Hazard, J.W. and Law, B.E. (1989) Forest Survey Methods Used in the USDA Forest Service. EPA/600/3-89/065. US Environmental Protection Agency, Environmental Research Laboratory, Corvallis, OR.
Hill, A.B. (1965) The environment and disease: Association or causation? Proceedings of the Royal Society of Medicine, 58, 295–300.
Hughes, M.D., Thompson, S.G. and Pocock, S.J. (1995) Optimal sequential screening guidelines for quantitative risk factors measured with error. Journal of the American Statistical Association, 90, 19–26.
Kish, L. (1987) Statistical Design for Research. Wiley, New York.
Max, T.A., Oswald, D.D., Schreuder, H.T., Hazard, J.W., Teply, J. and Alegria, J. (1996). The Pacific Northwest Region Vegetation Inventory and Monitoring System. PNW-RP-493, US Forest Service, Portland, Oregon.
Messer, J.J., Linthurst, R.A. and Overton, W.S. (1991) An EPA program for monitoring ecological status and trends. Environmental Monitoring and Assessment, 17, 67–78.
Mosteller, F. and Tukey, J.W. (1977) Data Analysis and Regression. Addison-Wesley Publishing Co., Reading, Massachusetts.
Ouyang, Z., Schreuder, H.T. and Li, J. (1992) A reevaluation of the growth decline in Georgia and Georgia-Alabama. In Proceedings 1991 Kansas State University Conference on Applied Statistics in Agriculture, April 28-30, 1991, Manhattan, KS, pp. 54–61.
Overton, W.S. and Stehman, S.V. (1995) Design implications of anticipated data uses for comprehensive environmental monitoring programs. Ecological and Environmental Statistics, 2(4), 287–303.
Overton, W.S., White, D. and Stevens, D.L., Jr (1990) Design Report for EMAP (Environmental Monitoring and Assessment Program). EPA/600/3-91/053. US Environmental Protection Agency, Office of Research and Development, Environmental Research Laboratory,Corvallis, OR.
Rothman, K.J. (1986) Modern Epidemiology. Little, Brown and Company, Boston.
Ruark, G.A., Thomas, C.E., Bechtold, W.A. and May, D.M. (1991) Growth reductions in naturally regenerated southern pine stands in Alabama and Georgia. Southern Journal of Applied Forestry, 15, 73–9.
Schreuder, H.T. and Czaplewski, R.L. (1992) Long-term strategy for the statistical design of a forest health monitoring system. Environmental Monitoring and Assessment, 27, 81–94.
Schreuder, H.T. and McClure, J.P. (1991) Modifying forest survey procedures to establish cause-effect. Should it be done? In Proceedings IUFRO World Forestry Congress. Paris, France, September, Revue Forestiere Francaise. Hors Serie No. 4. Sect. D. pp. 67–78.
Schreuder, H.T. and Thomas, C.E. (1991) Establishing cause-effect relationships using forest survey data. Forest Science, 37, 1497–1525 (includes discussion).
Scott, C.T. and Bechtold, W.A. (1995) Techniques and computations for mapping plot clusters that straddle stand boundaries. Forest Science Monograph, 41, 46-61.
Scott, C.T., Cassell, D.L. and Hazard, J.W. (1993) Sampling design of the U.S. National Forest Health Monitoring Program. In Proceedings Ilvessalo Symposium on National Forest Inventories, Helsinki, Finland, August 17-21, 1992, pp. 150–7.
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Olsen, A.R., Schreuder, H.T. Perspectives on large-scale natural resource surveys when cause-effect is a potential issue. Environmental and Ecological Statistics 4, 167–180 (1997). https://doi.org/10.1023/A:1018522428238
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DOI: https://doi.org/10.1023/A:1018522428238