手法を比較

	森林における生物多様性指数	林冠被覆率の推定
分野	林学	林学
系統	Process / pipeline	Process / pipeline
提唱年	1948–2004	2000s
提唱者	Shannon, Simpson, and Magurran	Jennings, Brown, Sheil, and colleagues
種類	Analysis and quantification pipeline	Measurement and estimation pipeline
原典	Shannon, C. E. (1948). A Mathematical Theory of Communication. The Bell System Technical Journal, 27(3), 379–423.	Jennings, S. B., Brown, N. D., & Sheil, D. (2000). Assessing Forest Canopies and Understorey Illumination: Methods and Applications. Forest Ecology and Management, 129(1-3), 219–243.
別名	Forest diversity index, Species richness assessment, Shannon index forestry	Canopy closure measurement, Crown cover estimation, Overstory density assessment
関連	4	4
概要	Forest biodiversity indices quantify species richness, evenness, and overall diversity in forest ecosystems. Rooted in information theory (Shannon) and statistical ecology (Simpson, Magurran), these indices compress complex multispecies data into interpretable metrics. Applied to forest inventory data, biodiversity indices guide conservation planning, assess ecological health, and track responses to management or disturbance.	Canopy cover, or canopy closure, is the proportion of ground area covered by tree crowns when viewed from above, typically expressed as a percentage. Formalized by Jennings and colleagues in pioneering work on tropical forest structure, canopy cover estimation employs multiple methods—from field-based ocular assessment to sophisticated remote sensing and terrestrial LiDAR—providing essential data on forest structure, light availability, and habitat characteristics relevant to ecology, silviculture, and climate research.