手法を比較

	Penman-Monteith方程式	植生による降雨分配：キャノピー遮断モデリング
分野	農学	農学
系統	Process / pipeline	Process / pipeline
提唱年	1948-1965	1971–1979 (foundational models; continuous development since)
提唱者	Howard Latimer Penman, John Monteith	Multiple contributors (Rutter et al. 1971; Gash 1979 for principal analytical frameworks)
種類	Mechanistic evapotranspiration model	Process-based hydrological model
原典	Penman, H. L. (1948). Natural evaporation from open water, bare soil and grass. Proceedings of the Royal Society A, 193(1032), 120-145.	Rutter, A. J., Kershaw, K. A., Robins, P. C., & Morton, A. J. (1971). A predictive model of rainfall interception in forests. Agricultural Meteorology, 9, 367–384.
別名	PM Equation, FAO-56 PM, Evapotranspiration Model	interception loss modeling, canopy rainfall partitioning, forest interception modeling, throughfall-stemflow modeling
関連	3	0
概要	The Penman-Monteith equation is a mechanistic model for estimating evapotranspiration (ET), the combined loss of water from soil and plant canopies to the atmosphere. First proposed by Penman (1948) for bare soil and water surfaces, then extended by Monteith (1965) to incorporate plant resistance to water vapor diffusion, it has become the international standard for water balance studies, crop water requirement calculation, and hydrological modeling.	Canopy interception modeling quantifies the fraction of rainfall captured by plant canopies and subsequently evaporated back to the atmosphere before reaching the soil. Applied across agronomy, forestry, and hydrology, it partitions gross precipitation into throughfall, stemflow, and interception loss. By linking vegetation structure — particularly leaf area index and canopy storage capacity — to water balance components, the method informs irrigation scheduling, watershed management, and crop water-use estimation.