Abstract
Large disturbances such as the 1988 Yellowstone fires produce considerable spatial heterogeneity in ecosystem processes across landscapes, in part by affecting vegetation structure. However, the persistence of this heterogeneity with time since disturbance, and thus the role of large disturbances in shaping the heterogeneity of ecosystem processes over large spatial and temporal scales, remains unclear. Such an inquiry requires that variability as well as mean conditions of forest structure and growth be examined if changes are to be projected for heterogeneous postdisturbance landscapes. We studied a chronosequence of unburned, mature lodgepole pine stands (stand ages ranging from 50 to 300 or more years) to examine the variability in stand density, leaf-area index (LAI), and stem growth [basal area increment (BAI), a surrogate for aboveground net primary productivity (ANPP)] with stand age, the relationships between these factors, and how these factors were related to stand and site characteristics. Variation in LAI and BAI was explained primarily by differences in stand density and age (r 2 = 0.51 for both LAI and BAI), and both LAI and BAI were most variable in the youngest age class [coefficient of variation (CV), 38% and 41% for LAI and BAI]. The relationship between LAI or BAI and stand density was significantly weaker (r 2 < 0.20) at stand ages characterized by canopy closure (50–175 years), suggesting that stand structure and production are closely linked. Thus, the spatial variability of stand production, which is initially very high following large fires in this landscape, is detectable for over a century before successional changes in forest structure greatly affect the initial postdisturbance landscape pattern of stand production. Given the recent focus on spatial heterogeneity of ecosystem processes across large landscapes, projecting changes in postdisturbance patterns of stand production has very strong significance for ecosystem science.
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Acknowledgments
For their fearless and enthusiastic assistance in the field, braving boat, bear, and bison, we thank Teresa Cohn, Sarah Cross, Katherine Findley, Heather Lyons, Brian Schwingle, Crystal Van Cutsem, and Steve Wangen. Creighton Litton was extremely helpful in conceptual discussions, and Dennis Knight provided ideas, direction, and encouragement in the early stages of this study. Jun Zhu provided statistical advice and support, and the University of Wyoming–National Park Service Research Station provided logistical support throughout the study. Tom Gower, Dennis Knight, and Mike Ryan made helpful comments on earlier versions of this article. This research was funded by the National Science Foundation Ecology and Ecosystem Studies Program (grant DEB-9806440), the Andrew Mellon Foundation, the UW-NPS Research Station, and the University of Wisconsin Department of Zoology.
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Kashian, D.M., Turner, M.G. & Romme, W.H. Variability in Leaf Area and Stemwood Increment Along a 300-year Lodgepole Pine Chronosequence. Ecosystems 8, 48–61 (2005). https://doi.org/10.1007/s10021-004-0067-1
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DOI: https://doi.org/10.1007/s10021-004-0067-1