宁夏砂田不同砾石覆盖厚度土壤入渗过程及模型分析
发布时间：2018-09-03 11:27
【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。
[Abstract]:Taking sandy soil in arid area of central Ningxia as the research object, the process of soil water infiltration in sandy field under different gravel cover thickness was studied. One dimensional vertical water head infiltration method was adopted, and gravel cover thickness was selected as the influencing factor. Five mulch thickness (0 ~ 6 ~ 9 ~ 1 ~ 12 ~ 15 cm) were set up to observe the change law of moisture front migration and infiltration amount, to compare the infiltration characteristics of each treatment, and to fit the soil infiltration process by using the model. The results showed that gravel mulch increased soil moisture infiltration ability, and soil wetting front migration distance and infiltration amount increased obviously. Compared with CK, the cumulative infiltration amount of gravel cover was increased by 4. 3%, 11. 8% and 17. 1%, respectively, and the average infiltration rate increased by 25. 8% and 62. 9%, respectively, and the gravel cover thickness changed the infiltration curve of soil water, which increased with the increase of gravel cover thickness, and the average infiltration rate increased by 25. 8% and 62. 9% respectively, while the gravel cover thickness changed the infiltration curve of soil water, which increased with the increase of gravel cover thickness, and the average infiltration rate increased by 25. 8% and 62. 9% respectively. The initial infiltration rate of soil increased rapidly, but the steady infiltration rate increased slowly. Compared with CK, the initial infiltration rate increased by 400.81% and 110cm, respectively, and the steady infiltration rate increased 15.30.17.9% and 25.6cm, respectively. Three infiltration models were used to fit the soil water infiltration process in sandy fields. The results showed that Horton model was the best fitting model for analyzing and predicting soil water infiltration process with different gravel cover thickness.
【作者单位】： 宁夏大学资源环境学院;宁夏(中阿)旱区资源评价与环境调控重点实验室;
【基金】：国家自然科学基金项目(41461104) 宁夏自然科学基金项目(NZ16026)
【分类号】：S152.7
，
本文编号：2219847
[Abstract]:Taking sandy soil in arid area of central Ningxia as the research object, the process of soil water infiltration in sandy field under different gravel cover thickness was studied. One dimensional vertical water head infiltration method was adopted, and gravel cover thickness was selected as the influencing factor. Five mulch thickness (0 ~ 6 ~ 9 ~ 1 ~ 12 ~ 15 cm) were set up to observe the change law of moisture front migration and infiltration amount, to compare the infiltration characteristics of each treatment, and to fit the soil infiltration process by using the model. The results showed that gravel mulch increased soil moisture infiltration ability, and soil wetting front migration distance and infiltration amount increased obviously. Compared with CK, the cumulative infiltration amount of gravel cover was increased by 4. 3%, 11. 8% and 17. 1%, respectively, and the average infiltration rate increased by 25. 8% and 62. 9%, respectively, and the gravel cover thickness changed the infiltration curve of soil water, which increased with the increase of gravel cover thickness, and the average infiltration rate increased by 25. 8% and 62. 9% respectively, while the gravel cover thickness changed the infiltration curve of soil water, which increased with the increase of gravel cover thickness, and the average infiltration rate increased by 25. 8% and 62. 9% respectively. The initial infiltration rate of soil increased rapidly, but the steady infiltration rate increased slowly. Compared with CK, the initial infiltration rate increased by 400.81% and 110cm, respectively, and the steady infiltration rate increased 15.30.17.9% and 25.6cm, respectively. Three infiltration models were used to fit the soil water infiltration process in sandy fields. The results showed that Horton model was the best fitting model for analyzing and predicting soil water infiltration process with different gravel cover thickness.
【作者单位】： 宁夏大学资源环境学院;宁夏(中阿)旱区资源评价与环境调控重点实验室;
【基金】：国家自然科学基金项目(41461104) 宁夏自然科学基金项目(NZ16026)
【分类号】：S152.7
，
本文编号：2219847
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