Comparison of water-retention functions obtained from the extended evaporation method and the standard methods sand/kaolin boxes and pressure plate extractor

Schindler U.; Mueller L.; da Veiga M.; Zhang Y.; Schlindwein S.; Hu C.

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Comparison of water-retention functions obtained from the extended evaporation method and the standard methods sand/kaolin boxes and pressure plate extractor

机译：扩展蒸发法与标准方法砂/高岭土箱和压板萃取器获得的保水功能的比较

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Knowledge of the soil hydraulic functions is required for various hydrological studies and for the simulation of water and solute fluxes in unsaturated soils. Sand/kaolin boxes are frequently used to determine these properties in the low-tension range. For higher tensions the pressure plate extractor is mainly applied. The extended evaporation method allows a more efficient determination of the water-retention curve in an adequate range. Besides this method enables to quantify simultaneously the unsaturated hydraulic-conductivity function. The objective of this study was to compare the water-retention curves obtained from the standard methods (STM) with those determined with the extended evaporation method (EEM). A set of 90 natural soil samples of different texture and origin was analyzed, and the agreement between the methods was statistically evaluated. The average water-content deviation (AWCD) of all samples was 1.83 vol.%, and the root mean square error (RMSE) 2.08 vol.%. The deviation of soil water-storage capacity in the pore-size classes 0-6, 6-30, 30-500, 500-1500 kPa varied between minimum -0.17 and 0.25 vol.% and maximum -2.89 and 2.36 vol.%, and confirmed the good comparability among the adopted methods. Systematic deviations between the methods were not found.

机译：各种水文研究以及模拟非饱和土壤中的水和溶质通量都需要了解土壤的水力功能。沙/高岭土箱经常用于确定低张力范围内的这些性能。对于更高的张力，主要使用压力板抽气机。扩展蒸发方法可以在适当范围内更有效地确定保水曲线。此外，该方法还可以同时量化不饱和水导率函数。这项研究的目的是将标准方法（STM）获得的保水曲线与扩展蒸发法（EEM）确定的保水曲线进行比较。分析了一组90种不同质地和来源的天然土壤样品，并对这些方法之间的一致性进行了统计学评估。所有样品的平均水含量偏差（AWCD）为1.83 vol。％，均方根误差（RMSE）为2.08 vol。％。孔径大小为0-6、6-30、30-500、500-1500 kPa的土壤储水量的偏差在最小-0.17和0.25 vol。％和最大-2.89和2.36 vol。％之间变化，并确认了所采用方法之间的良好可比性。没有发现方法之间的系统偏差。

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《Journal of plant nutrition and soil science》 |2012年第4期|共8页
作者
Schindler U.; Mueller L.; da Veiga M.; Zhang Y.; Schlindwein S.; Hu C.;
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正文语种 eng
中图分类农业基础科学;
关键词
PF curve.; Soil hydraulic functions; Soil hydraulic properties; Soil water storage;

机译：PF曲线;土壤水力功能;土壤水力特性;土壤蓄水;

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1. Comparison of water-retention functions obtained from the extended evaporation method and the standard methods sand/kaolin boxes and pressure plate extractor [J] . Schindler U., Mueller L., da Veiga M., Journal of plant nutrition and soil science . 2012,第4期

机译：扩展蒸发法与标准方法砂/高岭土箱和压板萃取器获得的保水功能的比较
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Comparison of water-retention functions obtained from the extended evaporation method and the standard methods sand/kaolin boxes and pressure plate extractor

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