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Using local spatial autocorrelation to compare outputs from a forest growth model

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  • Wulder, Michael A.
  • White, Joanne C.
  • Coops, Nicholas C.
  • Nelson, Trisalyn
  • Boots, Barry

Abstract

Comparing model outputs is a critical precursor to successfully applying models to environmental issues. In this paper, we applied a calibrated physiological model (3PG) and predicted two fundamental forest growth attributes (leaf area index (LAI) and stand volume). As part of this simulation, we systematically changed two key model input parameters (soil water holding capacity and soil fertility rating) and compared the model outputs utilising a method that accounts for local spatial autocorrelation. The use of the Getis statistic (Gi*) provides insights on the spatial ramifications of an aspatial change to model inputs. Specifically, the location of significant Gi* values identified areas where the differences in LAI and stand volume occur and are spatially clustered. When soil water is doubled and soil fertility is unchanged, both LAI and stand volume increase; conversely, when soil water is doubled and soil fertility is halved, both LAI and stand volume decrease. The increase and decrease in these model outputs occurred differentially across the study area, although there is a similar pattern to the location of the significant Gi* values (p=0.10) in both LAI and stand volume outputs, for each model scenario. Analyzing the local spatial autocorrelation of the differences between model outputs identified those areas that have systematic sensitivity to specific model inputs. This information may then be used to aid in the interpretation of model outputs, or to direct the collection of additional data to refine model predictions.

Suggested Citation

  • Wulder, Michael A. & White, Joanne C. & Coops, Nicholas C. & Nelson, Trisalyn & Boots, Barry, 2007. "Using local spatial autocorrelation to compare outputs from a forest growth model," Ecological Modelling, Elsevier, vol. 209(2), pages 264-276.
    • Handle: RePEc:eee:ecomod:v:209:y:2007:i:2:p:264-276
    DOI: 10.1016/j.ecolmodel.2007.06.033
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    References listed on IDEAS

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    1. Peter A. Rogerson, 2002. "Change detection thresholds for remotely sensed images," Journal of Geographical Systems, Springer, vol. 4(1), pages 85-97, March.
    2. J. Keith Ord & Arthur Getis, 2001. "Testing for Local Spatial Autocorrelation in the Presence of Global Autocorrelation," Journal of Regional Science, Wiley Blackwell, vol. 41(3), pages 411-432, August.
    3. Miller, Jennifer & Franklin, Janet & Aspinall, Richard, 2007. "Incorporating spatial dependence in predictive vegetation models," Ecological Modelling, Elsevier, vol. 202(3), pages 225-242.
    4. Li, Yong & White, Robert & Chen, Deli & Zhang, Jiabao & Li, Baoguo & Zhang, Yuming & Huang, Yuanfang & Edis, Robert, 2007. "A spatially referenced water and nitrogen management model (WNMM) for (irrigated) intensive cropping systems in the North China Plain," Ecological Modelling, Elsevier, vol. 203(3), pages 395-423.
    5. Swain, D.L. & Hutchings, M.R. & Marion, G., 2007. "Using a spatially explicit model to understand the impact of search rate and search distance on spatial heterogeneity within an herbivore grazing system," Ecological Modelling, Elsevier, vol. 203(3), pages 319-326.
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    1. Coops, Nicholas C. & Waring, Richard H. & Schroeder, Todd A., 2009. "Combining a generic process-based productivity model and a statistical classification method to predict the presence and absence of tree species in the Pacific Northwest, U.S.A," Ecological Modelling, Elsevier, vol. 220(15), pages 1787-1796.

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