| 宁夏砂田不同砾石覆盖厚度土壤入渗过程及模型分析 |
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| 引用本文： | 白一茹,赵云鹏,王幼奇,张 兴.宁夏砂田不同砾石覆盖厚度土壤入渗过程及模型分析[J].水土保持学报,2017,31(4):81-85. |
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| 作者姓名： | 白一茹 赵云鹏 王幼奇 张 兴 |
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| 作者单位： | 宁夏大学资源环境学院,银川750021;宁夏(中阿)旱区资源评价与环境调控重点实验室,银川750021 |
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| 基金项目： | 国家自然科学基金项目(41461104)，宁夏自然科学基金项目(NZ16026) |
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| 摘 要： | 以宁夏中部旱区砂田土壤为研究对象,通过对不同砾石覆盖厚度条件下砂田土壤水分入渗过程进行研究,采用一维垂直定水头入渗法,选取砾石覆盖厚度为影响因子,设置5个覆盖厚度(0,6,9,12,15cm),观测湿润锋运移和入渗量变化规律,比较各处理土壤入渗特征,利用模型拟合土壤入渗过程。结果表明,砾石覆盖提高了土壤水分入渗能力,土壤湿润锋运移距离和入渗量明显增加。与CK相比,砾石覆盖厚度为6,9,12,15cm时的累积入渗量分别增加了4.3%,11.8%,12.8%和17.1%,平均入渗率增加了25.8%,38.7%,50.0%和62.9%;同时砾石覆盖厚度改变了土壤水分入渗曲线,随着砾石覆盖厚度增加,土壤初始入渗率迅速增加,但稳定入渗率增加较为缓慢。与CK相比,砾石覆盖厚度为6,9,12,15cm时的初始入渗速率分别增加了40%,81%,91%和110%;稳定入渗速率分别增加了15.3%,17.9%,20.5%和25.6%。利用3种入渗模型对砂田土壤水分入渗过程进行拟合,结果表明Horton模型拟合效果最好,是分析和预测不同砾石覆盖厚度土壤水分入渗过程的适宜模型。
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| 关 键 词： | 砂田 土壤入渗 砾石厚度 模型分析 宁夏 |
Soil Infiltration Process and Model Analysis of Field Mulched with Different Thickness of Gravel-Sand in Ningxia |
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| BAI Yiru,ZHAO Yunpeng,WANG Youqi,ZHANG Xing.Soil Infiltration Process and Model Analysis of Field Mulched with Different Thickness of Gravel-Sand in Ningxia[J].Journal of Soil and Water Conservation,2017,31(4):81-85. |
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| Authors: | BAI Yiru ZHAO Yunpeng WANG Youqi ZHANG Xing |
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| Institution: | 1.College of Resources and Environmental Science, Ningxia University, Yinchuan 750021;2.Ningxia (China-Arab) Key Laboratory of Resource Assessment and Environment Regulation in Arid Region, Yinchuan 750021 |
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| Abstract: | Soil water infiltration process of field mulched by different thickness of gravel-sand in arid area of central Ningxia was studied by one-dimensional vertical water infiltration method.This study selected the gravel sand thickness as the impact factor,and set five levels of thickness (0,6,9,12,and 15 cm).The variation laws of wetting front movement and infiltration amount were observed,the infiltration characteristics of each treatment were compared,and the infiltration process was simulated using model fitting in this study.The results indicated that gravel-sand mulching improved soil water infiltration capacity,soil wetting front distance and infiltration volume increased significantly.Compared with CK,the cumulative infiltration increased by 4.3％,11.8％,12.8％ and 17.1％ under gravel-sand thickness of 6,9,12 and 15 cm,respectively,and average infiltration rate increased by 25.8％,38.7％,50.0％ and 62.9％,respectively.Meanwhile,gravel-sand mulching changed the soil water infiltration curve.As the increasing of the gravel-sand thickness,the initial infiltration rate grew rapidly,while the steady infiltration rate increased slowly.Compared with CK,the initial infiltration rate raised by 40％,81％,91％ and 110％ under gravel-sand thickness of 6,9,12 and 15 cm,respectively,and the steady infiltration rate increased by 15.3％,17.9％,20.5％ and 25.6％,respectively.The Kostiakov model,Horton model and Philip model were used to simulate the soil infiltration process,and the results indicated that Horton model fit better (R2＞0.98) than the rest two models,and it was more suitable to analyze and predict the soil infiltration process under different thickness of gravel-sand mulching in the northwestern arid area. |
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| Keywords: | gravel-sand mulched field soil infiltration thickness of gravel-sand model analysis Ningxia |
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