Pedotransfer functions of soil water retention curve based on joint multifractal

作者：Liu Jilong^*; Ma Xiaoyi; Zhang Zhenhua; Fu Qiang

来源：Transactions of the Chinese Society for Agricultural Machinery, 2012, 43(3): 51-56.

DOI：10.6041/j.issn.1000-1298.2012.03.010

• Different scale
• High precision
• Multi fractals
• Pedotransfer functions
• Root mean square errors
• Scale effects
• Small scale
• Soil layer
• Soil water content
• Soil water retention curves
• Spatial variability
• Theoretical foundations
• Van Genuchten model

The factors that have obvious effects on spatial variability at the different scales were identified with joint multifractal, and pedotransfer functions of van Genuchten model parameters which considered scale effect at small and large scale were established based on the above educed conclusion, furthermore, feasibility that concluded and educed at small scale with joint multifractal and applied at large scale was explored. The results showed that root mean square error of forecasted soil water content based on pedotransfer functions of van Genuchten model parameters in 0~20 cm and 20~40 cm soil layers at small scale was 0.0386 and 0.0473 respectively, and RMSE of forecasted soil water content based on pedotransfer functions of van Genuchten model parameters in 0~20 cm and 20~40 cm soil layers at large scale was 0.0270 and 0.0304 respectively; conclusions educed at small scale with joint multifractal could be applied at large scale, and pedotransfer functions based on these conclusions had strong theoretical foundation and high precision.

• 出版日期2012
• 单位东北农业大学