Knowledge Resource Center for Ecological Environment in Arid Area
Derivation of Pedo-Transfer Functions of some calcareous soils | |
Homaee, M; Khodaverdiloo, H | |
通讯作者 | Homaee, M |
会议名称 | International Conference on Water-Saving Agriculture and Sustainable Use of Water and Land Resources |
会议日期 | OCT 26-29, 2003 |
会议地点 | Yangling, PEOPLES R CHINA |
英文摘要 | The parametric description of the soil water retention curve is crucial for monitoring water status in the root zone, particularly in arid and semi-arid regions. The direct measurement of this curve due to its high non-linearity is time consuming and costly. In recent years, many attempts have been made to indirectly predict the retention curve from readily/easily obtainable soil parameters. The so-called Pedo Transfer Functions (PTF) have been proven to be a valuable indirect tool to estimate the soil moisture characteristics with reasonable accuracy. The objective of this study was to derive PTFs to predict the parameters of the closed form equation of Van Genuchten from particle size distribution, calcium carbonate, particle geometric mean diameter. particle geometric standard deviation and soil bulk density. Consequently, 57 soil samples with different particle size distributions and calcium carbonate contents were used to establish the PTFs at the range of 10, 33, 100 300, 500 and 1500 kPa. The soil samples were delivered to the laboratory to determine the particle size distribution, equivalent calcium carbonate and the retention curves. The bulk densities were determined in the field. The least square optimizer program RETC was used to obtain the Van Genuchten parameters. The best combination of independent variables for prediction of the dependent variables was selected by the best subset regression method. The regression equations were obtained using multiple linear regression method. The results indicated that the water retention at the range of interest could be predicted reasonably well with the derived PTFs. Comparison of the derived retention curves with those measured and estimated provided a significant correlation (p = 0.001) when the calcium carbonate regarded as an input parameter. The point prediction of water retention at filed capacity and permanent wilting point provided an excellent correlation with the measured values. These observations suggest the use of PTFs in calcareous soils when the calcium carbonate inserted as an input parameter in these functions. |
英文关键词 | calcareous soils Pedo-Transfer Function soil moisture characteristics |
来源出版物 | WATER-SAVING AGRICULTURE AND SUSTAINABLE USE OF WATER AND LAND RESOURCES, VOLS 1 AND 2, PROCEEDINGS |
出版年 | 2004 |
页码 | 908-915 |
ISBN | 7-5369-3682-6 |
出版者 | SHAANXI SCIENCE & TECHNOLOGY PRESS |
类型 | Proceedings Paper |
语种 | 英语 |
国家 | Iran |
收录类别 | CPCI-S |
WOS记录号 | WOS:000225155800135 |
WOS关键词 | HYDRAULIC CONDUCTIVITY ; PEDOTRANSFER FUNCTIONS ; WATER-RETENTION ; ORGANIC-MATTER ; TEXTURE |
WOS类目 | Agricultural Engineering ; Water Resources |
WOS研究方向 | Agriculture ; Water Resources |
资源类型 | 会议论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/295254 |
作者单位 | (1)Univ Tarbiat Modarres, Dept Soil Sci, Tehran 14155, Iran |
推荐引用方式 GB/T 7714 | Homaee, M,Khodaverdiloo, H. Derivation of Pedo-Transfer Functions of some calcareous soils[C]:SHAANXI SCIENCE & TECHNOLOGY PRESS,2004:908-915. |
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