Journal of Food, Agriculture and Environment

Simulation of rainfall interception in a Pinus tabulaeformis plantation in North China

Author(s):

Wenjun Liang*, Guodong Ding

Recieved Date: 2012-10-03, Accepted Date: 2013-01-18

Abstract:

In order to test the adaptability of the 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, a throughfall exclusion experiment has been completed in a Pinus tabulaeformis plantation plot with the stem density of 1410 stems ha^-1 in Hebei province of North China in rainy season 2010. During the experiment process, rainfall, throughfall and stem flow were measured and canopy interception was simulated with the revised Gash analytical model and combined with environmental and meteorological data. In the process of simulation, regression method was used to determine canopy parameters and difference of interception of curves, which showed the relation between stem flow and rainfall, and canopy storage capacity was used as a stem storage capacity. The results show that the proportion of measured thoughtful, stem flow and canopy interception occupied to rainfall were 67.08%, 3.10% and 29.82%. Canopy storage capacity (S), stem storage capacity (St) and stem flow partitioning coefficient (PT) of Pinus tabulaeformis plantation were 2.68 mm, 1.22 mm and 0.03 mm, respectively. The evaporation rate of the plot was  0.01-0.37 mm h^-1 and the ratio of evaporation and rainfall (E/R) ranged from 0.01 to 0.19 in rainfall periods. Whether Ec/R ratio was held constant or varied, the revised Gash model was able to accurately simulate the weekly canopy interception of artificial Chinese pine forest (the total error <6%). The change of S made the largest variation (the interception variation of 10.7% or 12.9% was affected by 25% variation of S) in all the parameters, while the interception variation in the interception rate was relatively insensitive to St, c and E/R and insensitive to pt. 

Keywords:

Revised gash analytical model, canopy interception, Pinus tabulaeformis plantation

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 1
Category: Environment
Pages: 976-981

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