Dynamic Simulation of Soil Moisture Under Typical Land Preparation in Semi-arid Loess Area Using HYDRUS-1D Model

Dong Hongxia; Zhang Qindi; Wei Qiang

doi:10.13961/j.cnki.stbctb.2023.05.019

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Dynamic Simulation of Soil Moisture Under Typical Land Preparation in Semi-arid Loess Area Using HYDRUS-1D Model

- Dynamic Simulation of Soil Moisture Under Typical Land Preparation in Semi-arid Loess Area Using HYDRUS-1D Model
- Bulletin of Soiland Water Conservation Vol. 43, Issue 5, Pages: 156-168(2023)
- 作者机构：
  
  1. 山西师范大学生命科学学院,山西,太原,030031
  2. 山西冶金岩土工程勘察有限公司,山西,太原,030000
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2023.05.019
  CLC： S152.7;X171.1
- Published：2023
- 稿件说明：
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Dong Hongxia, Zhang Qindi, Wei Qiang. Dynamic Simulation of Soil Moisture Under Typical Land Preparation in Semi-arid Loess Area Using HYDRUS-1D Model[J]. Bulletin of Soiland Water Conservation, 2023, 43(5): 156-168.
DOI：

Dong Hongxia, Zhang Qindi, Wei Qiang. Dynamic Simulation of Soil Moisture Under Typical Land Preparation in Semi-arid Loess Area Using HYDRUS-1D Model[J]. Bulletin of Soiland Water Conservation, 2023, 43(5): 156-168. DOI： 10.13961/j.cnki.stbctb.2023.05.019.

摘要

[目的] 探究不同整地措施下的土壤水分动态特征，为评估坡面整地的生态水文效益，促进旱区植被恢复提供科学依据。[方法] 通过半干旱黄土区油松林自然坡面和鱼鳞坑、反坡台的原位对照研究，基于土壤水分动态监测，结合降雨事件，利用HYDRUS-1D软件模拟，揭示不同整地措施对土壤水分垂直运移特征的影响。[结果] ①一维非饱和土壤水分运移数值模型对0—40 cm土壤水分的模拟精度大于40—100 cm，适于表层(0—40 cm)土壤水分的模拟；整个研究期内，相同降雨条件下，鱼鳞坑、反坡台的土壤水分通量显著大于相应对照自然坡面样地(p＜0.05)，鱼鳞坑的土壤水分通量显著大于反坡台(p＜0.05)。②单独降雨条件下，0—40 cm内鱼鳞坑、反坡台的土壤水分通量比相应对照自然坡面样地平均提高9.07%，4.02%；鱼鳞坑、反坡台与相应对照自然坡面样地的平均差值最大在20，30 cm处，分别为0.79%，0.37%，整体呈先增后减趋势；降雨量为5—10 mm时，鱼鳞坑、反坡台的土壤水分通量最大为1.94%，1.42%，分别在30，40 cm；降雨量＞10 mm时，鱼鳞坑、反坡台的土壤水分通量最大值均在0—20 cm，随降雨量增大而逐渐降低；鱼鳞坑、反坡台各层土壤水分通量之间差异均不显著。③持续降雨条件下，0—40 cm内鱼鳞坑、反坡台的土壤水分通量比其对照自然坡面样地平均提高10.73%，4.72%；鱼鳞坑、反坡台与相应对照自然坡面样地的差值在0—20 cm内最显著(p＜0.05)，平均差值整体均呈递减趋势；鱼鳞坑、反坡台与相应对照自然坡面样地各层的差值在降雨量为10—20 mm时最显著(p＜0.05)，最大增量均在10 cm处，分别为1.35%，0.53%；鱼鳞坑各层的平均土壤水分通量呈递减趋势，反坡台呈递增趋势；不同降雨特征下，鱼鳞坑、反坡台土壤水分通量最大值的深度不同，降雨量＜20 mm时，鱼鳞坑、反坡台在10，20 cm，分别为1.58%，0.72%，降雨量＞20 mm，均在40 cm，为2.61%，1.92%；鱼鳞坑、反坡台各层土壤水分通量间的显著性也不相同，降雨量为5—10 mm时鱼鳞坑各层土壤水分通量之间均有显著差异(p＜0.05)，反坡台在20—40 cm土壤水分通量之间有显著差异(p＜0.05)。[结论] 鱼鳞坑、反坡台均对土壤水分有不同程度的影响，鱼鳞坑在降雨条件下蓄水效果更好。

Abstract

[Objective] The dynamic characteristics of soil moisture under different land preparation measures were analyzed in order to provide a scientific basis for assessing the eco-hydrological benefits of slope land preparations and for promoting vegetation restoration in arid areas. [Methods] We used an in-situ controlled study of natural slopes

fish-scale pits

and reverse slopes of a Pinus tabulaeformis forest in a semi-arid loess area along with dynamic monitoring of soil moisture and rainfall events and HYDRUS-1D software simulations to quantify the effects of different land preparation measures on the vertical migration characteristics of soil moisture. [Results] ① The simulation accuracy of the one-dimensional unsaturated soil moisture transport numerical model for soil moisture in the 0—40 cm layer was greater than that of the 40—100 cm layer

which was suitable for the simulation of surface (0—40 cm) soil moisture. During the entire study period

under the same rainfall conditions

the soil moisture fluxes of the fish-scale pits and the reverse slope terraces were significantly higher than the soil moisture flux of the corresponding natural slope (p＜0.05). The soil moisture flux of the fish-scale pits was significantly higher than that of the reverse slope terraces (p＜0.05). ② Under individual rainfall conditions

the soil moisture fluxes of the fish-scale pits and the reverse slope terraces for the 0—40 cm layer were 9.07% and 4.02%

respectively

higher than that of corresponding natural slope plots. The average differences between the fish-scale pits

the reverse slope terraces

and the corresponding natural slope sample plots were the largest at 20 and 30 cm

which were 0.79% and 0.37%

respectively

exhibiting an overall trend of first increasing and then decreasing. When the rainfall was 5—10 mm

the maximum soil moisture fluxes of the fish-scale pits and the reverse slope terraces were 1.94% and 1.42%

respectively

at 30 cm and 40 cm. When the rainfall was more than 10 mm

the maximum soil moisture fluxes of the fish-scale pits and the reverse slope terraces were 0—20 cm

which gradually decreased with increasing rainfall. There was no significant differences in soil moisture fluxes between fish-scale pits and reverse slope terraces. ③ Under continuous rainfall

soil moisture fluxes of fish-scale pits and reverse slope terraces in 0—40 cm layer were 10.73% and 4.72% higher than the soil moisture flux of the control natural slope. The differences between fish-scale pits

reverse slope terraces and the corresponding control natural slope plots were the most significant within 0—20 cm layer (p＜0.05)

and the average difference showed an overall decreasing trend. The differences between fish scale pits

reverse slope terraces

and corresponding control natural slope at each soil layer were the most significant when the rainfall was 10—20 mm (p＜0.05)

and the maximum increment was at 10 cm

which was 1.35% and 0.53%

respectively. The average soil moisture flux in each layer of the fish-scale pits showed a decreasing trend

and the reverse slope terraces showed an increasing trend. Under different rainfall conditions

the depth of the maximum soil moisture flux of the fish-scale pits and the reverse slope terraces was different. When the rainfall was less than 20 mm

the fish-scale pits and the reverse slope terraces were at 10 and 20 cm

which were 1.58% and 0.72%

respectively. When rainfall was ＞20 mm

the values for both fish-scale pits and reverse slope terraces at 40 cm were 2.61% and 1.92%. There were significant differences in soil moisture flux between each layer of the fish-scale pits and the reverse slope terraces. When the rainfall was 5—10 mm

there were significant differences in soil moisture fluxes between each layer of the fish-scale pits (p＜0.05)

and there were significant differences in soil moisture fluxes between 20—40 cm in the reverse slope terraces (p＜0.05). [Conclusion] The fish-scale pits and the reverse slope terraces had different effects on soil moisture. The fish-scale pits had better water retention under rainfall conditions.

关键词

Keywords

references

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