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• W68926772 abstract "There is nothing else permanent in nature but change. Everything is moving, as the Greek philosopher Herakleitos stated some 2500 years ago. In even-age forestry, forest stands develop from open areas and young plantations to mature stages, and in all situations individual trees either grow annually, are felled or face a natural death through the struggle for existence, storms or other sources of damage. Changes in forest growing stock can be measured and to some extent attributed to human activities and changes in general growth factors: temperature, moisture, nutrients and light conditions. The estimation of such changes has become an increasingly important objective in forest inventories and in other contexts. Duncan and Kalton (1987), in their comparison of alternative survey designs in relation to various inventory objectives, found that remeasurement of permanent sample units is the best and often the only way to estimate components of change over time and aggregate data for individuals over time. When forest inventories and monitoring surveys are based on the use of permanent sample plots the definition of the necessary terms should be connected with the performing of periodic measurements. Discussions of the respective terminology and methodology have been presented by many authors, e.g., Chapman and Meyer (1949), Beers (1962), Ware and Cunia (1962), Nyyssonen (1967), Cunia and Chevrou (1969), Newton et al. (1974), Martin (1982), van Deusen (1989), Paivinen and Yli-Kojola (1989), Gregoire (1993) and Eriksson (1995). We will concern ourselves here only with changes in tree and growing stock dimensions and quantities. Changes in stand variables such as site indices or environmental properties are not included. The sampling unit can be a plot of either fixed or variable size, the most common fixed-sized plots being circular ones and the most common variable-sized plots concentric circular plots or Bitterlich relascope plots (or units of horizontal" @default.
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• W68926772 date "2006-02-18" @default.
• W68926772 modified "2023-09-27" @default.
• W68926772 title "Change Monitoring with Permanent Sample Plots" @default.
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• W68926772 doi "https://doi.org/10.1007/1-4020-4381-3_5" @default.
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