| 引用本文: | 孙志祥,邓建波,吕玉娟,等.长江上游低山丘陵区土壤水分特征曲线传递函数研究[J].灌溉排水学报,2022,41(6):97-104. |
| SUN Zhixiang,DENG Jianbo,LYU Yujuan,et al.长江上游低山丘陵区土壤水分特征曲线传递函数研究[J].灌溉排水学报,2022,41(6):97-104. |
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| 摘要: |
| 【目的】土壤水分特征曲线是定量研究土壤水分运动和溶质迁移的重要参数，为估算长江上游低山丘陵区土壤水力学参数提供实用的函数工具。【方法】以长江上游低山丘陵区盐亭万安小流域为研究区，测定3种不同土地利用类型（水田、旱地、林地）土壤水分特征曲线与土壤基本理化性质，在van Genuchten（1980）模型参数拟合及Pearson相关分析的基础上，运用多元逐步线性回归分析法，分别建立模型参数?r、?s、α和n的土壤传递函数，并进行准确度评估与分析。【结果】①研究区不同土地利用方式下土壤持水量的大小顺序为：水田＞旱地＞林地，但土壤供水能力差异不明显；②采用本研究建立的传递函数所得的土壤水分特征曲线估算与实测值对3种不同土地利用类型土壤的决定系数（R2）均高于0.97，旱地的估算效果最佳；③与4种常用传递函数（Vereecken（1989）、W?sten（1999）、Weynants（2009）和Schaap（2001））相比，采用本研究构建的土壤传递函数的估算准确度最高。【结论】本文构建的土壤传递函数可用作该地区土壤水分特征曲线模型参数估算的实用工具。 |
| 关键词: 土壤水分特征曲线；van Genuchten模型；土壤传递函数 |
| DOI：10.13522/j.cnki.ggps.2021609 |
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| Pedo-transfer Function for Estimating Hydraulic Properties of Soils in Hilly Areas in the Upper Reach of the Yangtze River |
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SUN Zhixiang, DENG Jianbo, LYU Yujuan, CUI Junfang, TANG Xiangyu
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1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
2. University of Chinese Academy of Sciences, Beijnig 100049, China;
3. College of Water Resources and Hydropower, Sichuan Agricultural University, Ya’an 625000, China
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| Abstract: |
| 【Objective】Soil water retention curve (SWRC) is an important parameter for studying subsurface hydrological processes and solute transport in soils, but its direct measurement is labor-intensive. For large scale applications, it is often estimated indirectly using some easy-to-measure soil properties. In this paper, we propose a pedo-transfer function to estimate hydraulic parameters of the soils in hilly regions in the upper reach of the Yangtze River. 【Method】Soil samples were taken from three land usages in the Yanting Wan’as watershed: paddy field, upland and forest. We measured their SWRC and other chemical and physical properties; the measured SWRC was fitted to the van Genuchten formula, from which we derived a pedo-transfer function to estimate the van Genuchten parameters using multiple stepwise linear regression analysis. Accuracy of the function was evaluated using the Pearson correlation analysis. 【Result】①Land use affects the ability of the soil to hold water. The land usage that affected water-holding capacity of the soil more was ranked in the order of paddy field > upland > forest land. In contrast, no significance was found in soil water supply capacity between different land usages. ②The coefficient of determination between the measured and predicted SWRC using the pedo-transfer function was greater than 0.97, and the proposed model was most accurate for soils taken from the upland. ③The proposed pedo-transfer function was more accurate than those proposed by Vereecken et al (1989), Wosten et al (1999), Weynants et al (2009) and Schaap et al (2001). 【Conclusion】The pedo-transfer function proposed in this paper for estimating water release curve using easy-to-measure soil properties is accurate and efficient. It can be used to estimate hydraulic parameters of the soils in the hilly regions in the upper reach of the Yangtze River. |
| Key words: soil moisture characteristic curve; van Genuchten model; pedo-transfer function; land usage |
