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| 森林植生シミュレーター× | 林分密度指数× | |
|---|---|---|
| 分野 | 林学 | 林学 |
| 系統 | Process / pipeline | Process / pipeline |
| 提唱年≠ | 1990 | 1933 |
| 提唱者≠ | George Dixon | Louis Reineke |
| 種類≠ | simulation system | density measurement |
| 原典≠ | Dixon, G. E. (2002). Essential FVS: A User's Guide to the Forest Vegetation Simulator. USDA Forest Service Rocky Mountain Research Station General Technical Report RMRS-GTR-120. link ↗ | Reineke, L. H. (1933). Perfecting a stand-density index for even-aged forests. Journal of Agricultural Research, 46(7), 627–638. link ↗ |
| 別名 | FVS, growth simulator | SDI, Reineke density index |
| 関連 | 2 | 2 |
| 概要≠ | The Forest Vegetation Simulator (FVS) is a widely used growth and yield model system developed by the USDA Forest Service that simulates tree and stand development over multiple decades. FVS uses individual-tree growth models (not stand averages) parameterized for different forest regions, allowing realistic simulation of mixed-species, uneven-aged, and disturbed forests. It is used operationally for harvest planning, fire modeling, wildlife habitat assessment, and management scenario evaluation across U.S. forests. | The Stand Density Index (SDI), introduced by Reineke in 1933, is a dimensionless measure of forest density that accounts for both tree number and size. It expresses the number of trees per hectare in a stand, adjusted to a reference quadratic mean diameter (QMD) of 25 cm, providing a standardized metric for comparing tree density across different forest types and sizes. SDI is widely used in forest management to assess stocking levels and to guide thinning decisions. |
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