Abstract
Aim of study: In order to test the adaptability of revised Gash analytical model to canopy interception of Pinus tabulaeformis plantation, determine local parameters in the model, and analyze the sensitivity of the parameters to the simulated interception.Area of study: The throughfall experiment has been completed in Hebei province of China during 2010.Material and methods: During the experiment process, rainfall，throughfall and stemflow were measured and canopy interception was simulated with the revised Gash analytical model.Main results: The results show that the rate of measured throughfall, stem flow and canopy interception occupied to rainfall were 67.08%, 3.10% and 29.82%. Canopy storage capacity, stem storage capacity and Stemflow partitioning coefficient was 2.68 mm, 1.22mm and 0.03. Evaporation rate varied from 0.01 to 0.37 mm•h-1 and the ratio of evaporation and rainfall (E/R) ranged from 0.01 to 0.19 in rainfall periods.Research highlights: The revised gash model was able to accurately simulate the weekly canopy interception of Pinus tabulaeformis forest.Key words: Gash analytical model; Throughfall; Canopy interception; Pinus tabulaeformis plantation.
Highlights
Partition of rainfall into throughfall, stemflow and interception loss it is the first interaction between water cycle and forest (Limousin et al 2008)
Main results: The results show that the rate of measured throughfall, stem flow and canopy interception occupied to rainfall were 67.08%, 3.10% and 29.82%
Vegetation is dominated by Pinus tabulaeformis plantation and understory species compose a sparse grass-shrub layer, Herb cover is less than 35% and the height is lower than 0.6 m
Summary
Partition of rainfall into throughfall, stemflow and interception loss it is the first interaction between water cycle and forest (Limousin et al 2008). The interception of precipitation by vegetation canopies is a major component of the surface water balance (Link et al 2004) and it has been extensively studied. The majority of interception studies in temperate conifer canopies have been research in relatively young plantation forests in Europe (Ford and Deans, 1978; Gash and Stewart 1977; Gash et al 1980; Johnson 1990; Kelliher et al 1992; Rutter et al 1972; Viville et al 1993).
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