مقایسهٔ روشها
روشهای انتخابی خود را کنار هم مرور کنید؛ ردیفهای متفاوت برجسته شدهاند.
| شاخص سطح برگ× | شاخص تراکم ردیف (SDI)× | |
|---|---|---|
| حوزه≠ | زراعت | جنگلداری |
| خانواده | Process / pipeline | Process / pipeline |
| سال پیدایش≠ | 1947 | 1933 |
| پدیدآور≠ | Donald J. Watson | Louis Reineke |
| نوع≠ | Plant morphometric measurement | density measurement |
| منبع بنیادین≠ | Watson, D. J. (1947). Comparative physiological studies on the growth of field crops: I. Variation in net assimilation rate and leaf area between species and varieties, and within and between years. Annals of Botany, 11(43), 375-407. DOI ↗ | Reineke, L. H. (1933). Perfecting a stand-density index for even-aged forests. Journal of Agricultural Research, 46(7), 627–638. link ↗ |
| نامهای دیگر≠ | LAI, Leaf area, Canopy structure | SDI, Reineke density index |
| مرتبط≠ | 3 | 2 |
| خلاصه≠ | Leaf Area Index (LAI) is a dimensionless quantity that measures the total one-sided area of leaves per unit ground area covered by a canopy. It quantifies canopy density and structure: LAI = 0 for bare soil, LAI = 1 for a thin crop, LAI = 3-6 for dense cereal or grass canopies, and LAI > 8 for dense forest. LAI is a key variable in crop growth models, evapotranspiration estimation, and remote sensing because it directly controls light interception, photosynthesis, and water loss from vegetation. | 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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