青海高寒地区典型针叶林的降雨分配特征及Gash修正模型的应用

doi:10.16843/j.sswc.2021.05.007

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Abstract [Background] In this study, the revised Gash model was used to simulate the interception process of two typical coniferous forests (Larix principis-rupprechtii and Picea crassifolia) in the alpine region of Qinghai province in order to understand the precipitation distribution of different forest stands on the same site. Concurrently, it can provide a theoretical basis for the evaluation of water conservation function of stand, so as to maintain the stability of stand, and give full play to the function of water and soil conservation as well as water conservation of stand.[Methods] From May 15th to August 15th, 2019, we selected two plots of L. principis-rupprechtii(the forest density of 1 700 trees/hm², canopy density 0.62)and P. crassifolia(the forest density of 3 125 trees/hm², canopy density 0.62)on the high and shallow slopes of the Anmentan watershed in Datong county, Qinghai province. We measured their throughfall, stemflow and canopy interception. And we simultaneously monitored conventional meteorological factors such as rainfall outside the forest, solar radiation intensity, wind speed, air relative humidity, and atmospheric temperature. Finally, we used the revised Gash model to simulate the canopy interception of two forest stands and performed an error analysis.[Results] 1) Under the same site conditions, the canopy interception of P. crassifolia was higher than that of L. principis-rupprechti. 2) The simulated canopy interceptions of L. principis-rupprechtii and P. crassifolia by the revised Gash model were 59.02 mm and 61.36 mm respectively, accounting for 23.07% and 23.98% of the total rainfall. And their relative errors were 10.55% and 13.64% respectively. The simulated values of the two stands were less than the measured values. 3)The sensitivity ranking of each parameter in the revised Gash model was canopy saturated water capacity (S) > average evaporation intensity (E) > average precipitation intensity (R) > canopy density (c) > trunk storage capacity (S_t) > drainage partitioning coefficient (P_t). Except for R that had a negative effect on the results, the other parameters had a positive effect on the simulation results of the interception.[Conculsions] The revised Gash model can better simulate the canopy interception of L. principis-rupprechtii and P. crassifolia. The canopy saturated water-holding capacity is a key factor affecting the simulation effect of the model. This model may provide theoretical guidance for the evaluation of forest stand water conservation function in this area.

Key words： Larix principis-rupprechtii Picea crassifolia canopy interception revised Gash model sensitivity analysis

Received: 28 July 2020

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S715.2

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	Articles by authors
	ZUO Yafan
	HE Kangning
	WANG Shuaijun
	YU Guofeng
	CHAI Shixiu
	LI Yuanhang

Cite this article:

ZUO Yafan,HE Kangning,WANG Shuaijun, et al. Rainfall distribution characteristics of typical coniferous species in the alpine region of Qinghai and the application of revised Gash model[J]. SSWC, 2021, 19(5): 53-62.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2021.05.007 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2021/V19/I5/53

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