手法を比較

	林冠被覆率の推定	森林における生物多様性指数
分野	林学	林学
系統	Process / pipeline	Process / pipeline
提唱年	2000s	1948–2004
提唱者	Jennings, Brown, Sheil, and colleagues	Shannon, Simpson, and Magurran
種類	Measurement and estimation pipeline	Analysis and quantification pipeline
原典	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.	Shannon, C. E. (1948). A Mathematical Theory of Communication. The Bell System Technical Journal, 27(3), 379–423.
別名	Canopy closure measurement, Crown cover estimation, Overstory density assessment	Forest diversity index, Species richness assessment, Shannon index forestry
関連	4	4
概要	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.	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.