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,0,():-. |
| SUN Zhixiang,DENG Jianbo,Lv 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,0,():-. |
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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】该文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qr、qs、α和n的土壤传递函数,并进行准确度评估与分析。【结果】结果表明:(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)均大于0.97,旱地的估算效果最佳,R2达0.99;(3)与4种常用传递函数(Vereecken et al(1989)、W?sten et al(1999)、Weynants et al(2009)和Schaap et al(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: |
分类号:X143 |
基金项目:中国科学院战略性先导科技专项(A类)(XDA23090202);国家自然科学基金重大项目课题(41790431);第二次青藏高原综合科学考察研究资助(2019QZKK0903)。 |
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Study on Pedotransfer Functions of Soil Hydraulic Parameters in Hilly Areas in the Upper Yangtze River |
SUN Zhixiang1, DENG Jianbo2, Lv Yujuan1, CUI Junfang1, TANG Xiangyu1
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1.Institute of Mountain Hazards and Environment,Chinese Academy of Sciences;2.College of Water Resources and Hydropower, Sichuan Agricultural University
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Abstract: |
【objective】Soil water retention curve (SWRC) is crucial parameters for quantitative studies on soil hydrological processes and solute transport in soil, To provide a practical functional tool for estimating soil hydraulics parameters in the lower hilly areas of the upper Yangtze River.【method】This study investigates the soil-water characteristic curve and the selected physical and chemical properties of soils under three different land use types in Yanting Wan"an watershed located at the hilly area of the upper reaches of the Yangtze River. The experimental data were fitted to the soil-water retention model of van Genuchten (1980), and Pearson correlation analysis were conducted. Pedotransfer functions for estimating the van Genuchten"s equation parameters, qr、qs、α and n, were established and verified through multiple stepwise linear regression analyses. 【result】The results showed :(1) the soil-water retention capacity followed the order: paddy field > upland > forest land, while the soil water supply capacities were not significant among different land use types; (2) the coefficient of determination (R2) of the estimated SWRCs, compared with the measured ones, was greater than 0.97 across the three land use types, and the best fitting was obtained in upland, reaching 0.99, (3) that the estimation accuracies of the soil transfer function developed in this study were higher than those of four commonly used transfer functions proposed by Vereecken et al (1989), Wosten et al (1999), Weynants et al (2009), and Schaap et al (2001).【conclusion】The soil transfer function constructed in this paper can be used as a practical tool for estimating the parameters of the soil moisture characteristic curve model in this region. |
Key words: soil moisture characteristic curve; van Genuchten model; soil transfer function |