JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2016, Vol. 40 ›› Issue (04): 81-88.doi: 10.3969/j.issn.1000-2006.2016.04.013

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Simulation of canopy rainfall interception of the Larix gmelinii forest by the modified Gash model in Greater Hinggan Mountains

LIU Yujie, MAN Xiuling*   

  1. Colleg of Forestry, Northeast Forestry University,Harbin 150040, China
  • Online:2016-08-18 Published:2016-08-18

Abstract: In order to verify the applicability of the modified Gash model in simulating canopy rainfall interception of natural Larix gmelinii forest in Greater Higgnan Mountains, fifty-six rainfall data of canopy interception, meteorological factors and stand characteristic from April to October 2014 were analyzed and compared with the simulation in terms of weekly cumulative rainfall, seasonal cumulative rainfall and annual rainfall. The experiment and simulation results showed that, during the observation period, the rainfall was amounted to(289.4±1.66)mm, in which the through-fall, stem-flow and canopy interception were measured as 75.44%, 2.60% and 21.95% of the total rainfall, respectively. The simulated value of overall canopy interception was 65.17 mm and the measured one was 63.53 mm, counting a 2.58% relative error between them. The relative error between the simulation and measurement of the weekly cumulative canopy interception was 2.59%. When the seasonal factor was taken into account, the relative errors between them were 0.71%, 3.62% and 0.44% for spring, summer and autumn, respectively. The lower value of precipitation of a single rainfall corresponded to the higher simulation accuracy of the canopy interception. When the precipitation of a single rainfall increased to a higher value, e.g. 12.23 mm, the simulation accuracy was significantly compromised. In general, this modified Gash model can predict canopy interception in the natural L. gmelinii forest and thus provide a scientific and simplified method for the future research and management of hydrological cycle in Greater Hinggan Mountains.

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