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| 林冠ギャップ率× | 林分密度指数× | |
|---|---|---|
| 分野 | 林学 | 林学 |
| 系統 | Process / pipeline | Process / pipeline |
| 提唱年≠ | 1979 | 1933 |
| 提唱者≠ | John Norman | Louis Reineke |
| 種類≠ | measurement pipeline | density measurement |
| 原典≠ | Machado, J.-L., & Reich, P. B. (1999). Evaluation of several measures of canopy openness. Canadian Journal of Forest Research, 29(9), 1439–1444. 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 | gap fraction, canopy openness | SDI, Reineke density index |
| 関連 | 2 | 2 |
| 概要≠ | Canopy gap fraction quantifies the proportion of sky visible through the forest canopy, expressed as a percentage. Developed to measure light availability in the understory, it is a standard metric in forest ecology for characterizing canopy structure and microhabitat conditions. This measure is essential for understanding light-limited photosynthesis and seedling establishment in closed-canopy 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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