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a Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China 100101
b Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
c China Agricultural Univ., Beijing, China 100094
* Corresponding author (rhorton{at}iastate.edu).
The heat-pulse method measures soil volumetric water content (
) based on the linear relationship between soil volumetric heat capacity (C) and . Previous work suggested that this method was more appropriate for determining change of rather than its absolute value. In this study, we demonstrate that the heat-pulse method can give accurate estimation when values for the specific heat of the soil solids (cs) are determined using the heat-pulse method. Heat-pulse measurements were performed on packed columns of three soils with a wide range of bulk density (
b) and . When the commonly used cs value (0.725 kJ kg-3 K-1) was used, the heat-pulse method overestimated by 0.052 m3 m-3 on average. However, when cs values determined from heat-pulse measurements on oven-dried soil were used, the heat-pulse method provided accurate results (-0.006 m3 m-3 average error). Using soil-specific, heat-pulse determined cs values also reduced the average root mean square error (RMSE) in for the three soils from 0.061 to 0.039 m3 m-3.
Abbreviations: C, soil volumetric heat capacity • cs, specific heat of soil solids • RMSE, root mean square error • , soil volumetric water content • b, bulk density • w, density of water
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