Applicability of Hydrus-1D Model in simulating the soil moisture in Hedysarum leave in Mu Us Sandy Land， China

doi:10.7522/j.issn.1000-694X.2022.00045

Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (6): 233-242.DOI: 10.7522/j.issn.1000-694X.2022.00045

Applicability of Hydrus-**1D Model in simulating the soil moisture in Hedysarum leave in Mu Us Sandy Land， China**

Guangyu Hong¹(), Xiaojiang Wang¹(), Tieshan Liu¹, Hailong¹, Zhenting Wu¹, Huercha¹, Xiaowei Gao¹, Haifeng Yang¹, Zhuofan Li¹, Zihao Li¹, Siqin², Lejun Wang¹

^1.Inner Mongolia Forestry Research Institute，Hohhot 010010，China
^2.Grassland Technologic Service Center of Zarut Banner，Zarut Banner 029100，Inner Mongolia，China

Received:2022-02-10 Revised:2022-03-22 Online:2022-11-20 Published:2023-01-09
Contact: Xiaojiang Wang

Abstract

Abstract:

In the process of vegetation restoration and reconstruction in arid and semi-arid areas， soil water storage will change obviously， and soil water is the main factor limiting vegetation growth. Using mathematical simulation method to study the characteristics of soil water change after vegetation construction can predict soil water deficit under global climate change more quickly. In this study， the Hydrus-1D model was used to simulate the spatial and time variation of soil moisture in a typical Hedysarum leave shrubbery community in the Mu Us Sandy Land， and to evaluate the applicability of the Hydrus-1D model in the H. leave shrubbery in the Mu Us Sandy Land. Taking H. leave growing season as the study period. The measured values were put into the Hydrus-1D modell and the parameters were optimized to simulate the spatial and time variation of soil moisture in H. leave shrubbery. The soil moisture data of different soil layers monitored by Watchdog soil moisture monitor in the same time period were used as the control value to verify the applicability of the simulated value. The results showed that the coefficients of measured soil moisture and simulated soil moisture at different depths were in the range of 0.55-0.78， and the root mean square error was 0.005%-0.0143%. The measured soil moisture and simulated soil moisture were in good agreement， indicating that the Hydrus-1D model was suitable for simulating the soil moisture variation of H. leave shrubbery in Mu Us Sandy Land.

Key words: Mu Us Sandy Land, Hedysarum leave shrubbery, soil moisture, Hydrus-1D Model, applicability

CLC Number:

S152.7

Guangyu Hong, Xiaojiang Wang, Tieshan Liu, Hailong, Zhenting Wu, Huercha, Xiaowei Gao, Haifeng Yang, Zhuofan Li, Zihao Li, Siqin, Lejun Wang. Applicability of Hydrus-1D Model in simulating the soil moisture in Hedysarum leave in Mu Us Sandy Land， China[J]. Journal of Desert Research, 2022, 42(6): 233-242.

Figures/Tables 9

References 32

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土层深度 /cm	粒径组成/%			容重 /(g·cm^-3)	VG参数
土层深度 /cm	0.05—2.00 mm	0.002—0.05 mm	<0.002 mm	容重 /(g·cm^-3)	θ_r	θ_s	α	n	K_s	l
0—20	97.93	0.69	1.38	1.6507	0.0285	0.3398	0.0309	3.8507	36.1983	0.5
20—40	95.47	0.52	4.02	1.4860	0.0377	0.3948	0.0299	3.4402	32.1725	0.5
40—60	94.41	0.64	4.95	1.5149	0.0151	0.3869	0.0295	3.1932	25.6446	0.5
50—70	98.49	1.02	0.25	1.4782	0.0168	0.3917	0.0313	4.3366	56.3079	0.5
70—90	97.67	0.17	2.14	1.5286	0.0553	0.3787	0.0299	3.9854	43.3879	0.5
90—110	94.03	0.27	5.70	1.5259	0.0008	0.3844	0.0289	3.0738	22.9275	0.5

土层深度 /cm	粒径组成/%			容重 /(g·cm^-3)	VG参数
土层深度 /cm	0.05—2.00 mm	0.002—0.05 mm	<0.002 mm	容重 /(g·cm^-3)	θ_r	θ_s	α	n	K_s	l
0—20	97.93	0.69	1.38	1.6507	0.0285	0.3398	0.0309	3.8507	36.1983	0.5
20—40	95.47	0.52	4.02	1.4860	0.0377	0.3948	0.0299	3.4402	32.1725	0.5
40—60	94.41	0.64	4.95	1.5149	0.0151	0.3869	0.0295	3.1932	25.6446	0.5
50—70	98.49	1.02	0.25	1.4782	0.0168	0.3917	0.0313	4.3366	56.3079	0.5
70—90	97.67	0.17	2.14	1.5286	0.0553	0.3787	0.0299	3.9854	43.3879	0.5
90—110	94.03	0.27	5.70	1.5259	0.0008	0.3844	0.0289	3.0738	22.9275	0.5

时间段	R²	平均误差ME/%	均方根误差RMSE/%	相对误差MRE/%
模拟阶段	0.587	-0.0053	0.00017	0.2779
验证阶段	0.547	-0.0087	0.00038	0.3081

时间段	R²	平均误差ME/%	均方根误差RMSE/%	相对误差MRE/%
模拟阶段	0.587	-0.0053	0.00017	0.2779
验证阶段	0.547	-0.0087	0.00038	0.3081

类别	土层深度 /cm	平均误差ME/%	均方根误差RMSE/%	相对误差MRE/%
建模阶段	10	-0.0054	0.0104	0.3506
	30	-0.0069	0.0149	0.3494
	50	-0.0060	0.0137	0.3414
	70	0.0028	0.0040	0.1490
	90	-0.0119	0.0217	0.5225
	110	-0.0047	0.0071	1.0026
检验阶段	10	-0.0051	0.0128	0.3175
	30	-0.0063	0.0125	0.1962
	50	-0.0232	0.0265	0.6655
	70	-0.0004	0.0055	0.1518
	90	0.0069	0.0230	0.2812
	110	-0.0241	0.0267	6.0432

Applicability of Hydrus-**1D Model in simulating the soil moisture in Hedysarum leave in Mu Us Sandy Land， China**

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土层深度 /cm	类别	参数	降水量/mm（降水时长/h）
土层深度 /cm	类别	参数	32.4（8）	14.8（10）	63.61（8）	24.8（9）
10	模拟值	最大差值/（cm³·cm^-3）	0.021	0.020	0.039	0.036
	模拟值	入渗速率/（cm³·h^-1）	0.001	0.001	0.005	0.002
	实测值	最大差值/（cm³·cm^-3）	0.047	0.022	0.039	0.036
	实测值	入渗速率/（cm³·h^-1）	0.008	0.002	0.005	0.0045
30	模拟值	最大差值/（cm³·cm^-3）	0.050	0.025	0.083	0.031
	模拟值	入渗速率/（cm³·h^-1）	0.003	0.0007	0.0006	0.001
	实测值	最大差值/（cm³·cm^-3）	0.082	0.000	0.083	0.037
	实测值	入渗速率/（cm³·h^-1）	0.009	0.000	0.010	0.002
50	模拟值	最大差值/（cm³·cm^-3）	0.052	0.010	0.080	0.021
	模拟值	入渗速率/（cm³·h^-1）	0.001	0.0001	0.008	0.0004
	实测值	最大差值/（cm³·cm^-3）	0.010	0.000	0.070	0.009
	实测值	入渗速率/（cm³·h^-1）	0.0003	0.000	0.008	0.0002
70	模拟值	最大差值/（cm³·cm^-3）	0.0114	0.000	0.026	0.008
	模拟值	入渗速率/（cm³·h^-1）	0.0002	0.000	0.002	0.0001
	实测值	最大差值/（cm³·cm^-3）	0.0090	0.000	0.021	0.006
	实测值	入渗速率/（cm³·h^-1）	0.0002	0.000	0.001	0.00008
90	模拟值	最大差值/（cm³·cm^-3）	0.000	0.000	0.038	0.003
	模拟值	入渗速率/（cm³·h^-1）	0.000	0.000	0.002	0.00005
	实测值	最大差值/（cm³·cm^-3）	0.000	0.000	0.150	0.004
	实测值	入渗速率/（cm³·h^-1）	0.000	0.000	0.010	0.00006
110	模拟值	最大差值/（cm³·cm^-3）	0.000	0.000	0.067	0.000
	模拟值	入渗速率/（cm³·h^-1）	0.000	0.000	0.002	0.000
	实测值	最大差值/（cm³·cm^-3）	0.000	0.000	0.000	0.000
	实测值	入渗速率/（cm³·h^-1）	0.000	0.000	0.000	0.000

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