Temporal variations of soil saturated hydraulic conductivity under different land use types and its impact on water balance components

IF 5.9 1区 农林科学 Q1 AGRONOMY
Tianqi Guo , Yalin Ji , Xiaoying Yan , Ahmed Yehia Mady , Rui Liu , Mingbin Huang
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引用次数: 0

Abstract

Soil saturated hydraulic conductivity (Ks) is one of the important soil hydraulic properties impacting the dynamic changes in soil water content and water balance components. Determining the impact of the temporal variation of Ks on these components is helpful for water resource management on the Chinese Loess Plateau. The main objective of this work was to estimate the efficiency of dual-porosity model in Hydrus-1D for simulating soil water content and water balance components with and without the temporal variation of Ks. Moreover, the effect of temporal variation of Ks on water balance components was estimated under different land use types. In this study, the double ring infiltrometers were used to measure Ks values for corn field and forestland sites from April to October 2022. The dynamic changes of soil water content and water balance components for both land use types were simulated using the calibrated and validated dual-porosity equations in the Hydrus-1D model under the two scenarios: (1) constant Ks, an average over the whole measuring period, and (2) temporally variable Ks. The results showed the temporal variation of Ks was significant for the corn field site due to tillage and not significant for the forestland site due to the lack of disturbance. The accuracy of the dual-porosity equations in the Hydrus-1D model increased by 14 % for the corn field site but by only 5 % for the forestland site when considering temporally varying Ks vs. constant Ks. In addition, the temporal variation of Ks resulted in evaporation increasing by 1.27 %, deep percolation decreasing by 14.92 %, and no obvious changes in transpiration and soil water storage of 300 cm for the corn field site, while almost consistent water balance components for the forestland site for both scenarios. These results indicated the temporal variation of Ks should be considered to improve simulations of soil water content and water balance components, particularly in farmland, which are useful for managing soil and water resources.
不同土地利用类型下土壤饱和导水率的时间变化及其对水分平衡组分的影响
土壤饱和水导率(Ks)是影响土壤含水量和水分平衡组分动态变化的重要土壤水力特性之一。确定Ks的时间变化对这些组分的影响有助于黄土高原的水资源管理。本研究的主要目的是评估Hydrus-1D中双孔隙度模型在模拟土壤含水量和水分平衡成分时有无k随时间变化的效率。此外,还分析了不同土地利用类型下土壤水分平衡组分的时空变化规律。本研究利用双环渗透仪于2022年4 - 10月对玉米田和林地立地的k值进行了测量。利用Hydrus-1D模型中经过校准和验证的双孔隙度方程,模拟了两种土地利用类型下土壤含水量和水分平衡成分的动态变化:(1)恒定的Ks,即整个测量周期的平均值;(2)随时间变化的Ks。结果表明:玉米田样地由于耕作的原因,k值的时间变化显著,而林地样地由于缺乏干扰,k值的时间变化不显著。当考虑随时间变化的Ks与恒定的Ks时,Hydrus-1D模型中双孔隙度方程的精度在玉米田场地增加了14 %,而在林地场地仅增加了5 %。此外,随时间变化,玉米田样地蒸发量增加1.27 %,深渗减少14.92 %,300 cm土壤蒸腾和土壤储水量变化不明显,而林地样地的水分平衡成分基本一致。这些结果表明,应考虑钾的时间变化,以改进土壤含水量和水分平衡成分的模拟,特别是在农田,这对土壤和水资源的管理有用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Agricultural Water Management
Agricultural Water Management 农林科学-农艺学
CiteScore
12.10
自引率
14.90%
发文量
648
审稿时长
4.9 months
期刊介绍: Agricultural Water Management publishes papers of international significance relating to the science, economics, and policy of agricultural water management. In all cases, manuscripts must address implications and provide insight regarding agricultural water management.
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