Spatial variability of soil water retention curve in different soil layers and its affecting factors

被引：0
|
作者：
Liu J. [1 ]
Ma X. [1 ]
Zhang Z. [2 ]
机构：
[1] College of Hydraulic and Architectural Engineering, Northwest A and F University, Yangling
[2] Geography and Planning Department, Ludong University
来源：
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | 2010年 / 41卷 / 01期
关键词：
Multifractal; Soil layer; Soil water retention curve; Spatial variability;
D O I：
10.3969/j.issn.1000-1298.2010.01.009
中图分类号：
学科分类号：
摘要：
Spatial variability of van Genuchten model parameters and its affecting factors in 0~20 cm and 20~40 cm soil layers were studied with multifractal and joint multifractal methods. The results showed that in 0~20 cm and 20~40 cm soil layers parameter had obvious multifractal characteristics, and its spatial variability was strong caused by the distribution of lower and higher values respectively. The multifractal characteristics of parameter n and θs were not obvious, and the spatial variability was weak. Correlation characteristics between van Genuchten model parameters α and soil physical properties in 0~20 cm and 20~40 cm soil layers were analyzed. At the observation scale, the correlations between parameter n and sand and silt content were significant, the parameter n and sand and organic matter content had remarkable relationship, and θs was significantly related to sand content in 0~20 cm soil layer. The relationship between parameters α and organic matter content was remarkable, and the parameter n and θs were significantly related to sand, silt and organic matter content in 20~40 cm soil layer. At the multiple scales, correlations between parameters α and sand and silt content were most obvious in 0~20 cm soil layer, and parameters α were remarkably related to bulk density and organic matter content in 20~40 cm soil layer.
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页码：46 / 52
页数：6
相关论文
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