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Weighing Lysimeter Data Confirm the Accuracy and Precision of the Heat-Pulse Technique for Measuring Daily Soil Evaporation

文献类型： 外文期刊

作者： Wang, Yueyue 1 ; Ochsner, Tyson 3 ; Heitman, Joshua 4 ; Horton, Robert 5 ; Xue, Xuzhang 6 ; Ren, Tusheng 1 ;

作者机构： 1.China Agr Univ, Dept Soil & Water Sci, Beijing 100193, Peoples R China

2.Kingenta Ecol Engn Co Ltd, State Key Lab Nutr Resources Integrat Utilizat, Linshu 276700, Shandong, Peoples R China

3.Oklahoma State Univ, Dept Plant & Soil Sci, Stillwater, OK 74078 USA

4.North Carolina State Univ, Dept Soil Sci, Raleigh, NC 27695 USA

5.Iowa State Univ, Dept Agron, Ames, IA 50011 USA

6.Natl Engn Res Ctr Informat Technol Agr, Beijing 100097, Peoples R China

期刊名称：SOIL SCIENCE SOCIETY OF AMERICA JOURNAL （ 影响因子：2.307； 五年影响因子：2.832 ）

ISSN： 0361-5995

年卷期： 2017 年 81 卷 5 期

页码：

收录情况： SCI

摘要： The heat-pulse technique, which is based on the sensible heat balance, has been developed for measuring soil-water evaporation (E). The accuracy and precision of the technique has been previously tested with the Bowen ratio method and micro-lysimeters, which are themselves subject to considerable uncertainties. This study evaluated the accuracy and precision of the heat-pulse technique using direct, continuous, and nondestructive E measurements from a weighing lysimeter. Multi-needle heat-pulse probes were installed in a silt loam soil at four locations in a 22.5-m(3) (3-m x 3-m x 2.5-m) weighing lysimeter to measure soil thermal conductivity, heat capacity, and temperature gradients in the 0- to 5-cm layer. Daily E rates were estimated with sensible heat balance theory. Independent daily E rates obtained directly from a weighing lysimeter were used to evaluate the accuracy of heat-pulse E estimates during a 10-d drying period. Potential daily evaporation (E-0) was also computed using the Penman-Monteith equation. The E/E-0 ratio was >0.9 for the first 4 d but fell sharply thereafter and approached a stable value of 0.4. There was a linear relationship between heat-pulse values and weighing lysimeter values, with a slope of 0.95 and an offset of 0.09 mm d(-1). The absolute error of the heat-pulse E ranged from -0.02 to 0.29 mm d(-1) (or -1 to 8% of the true value), and the RMSE was 0.15 mm d(-1). The SD of the heat-pulse E data ranged from 0.07 to 0.51 mm d(-1), and the coefficients of variation ranged from 3 to 14%. We concluded that the heat-pulse technique can provide daily E measurements with good accuracy and precision.

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