Soil Heat Flux Measurement Based on Heat Pulse Method

LU Sen; ZHANG Jin-song; MENG Ping; SUN Shi-you

The principles and methods of measuring soil heat flux with three-needle heat pulse sensor are introduced based on the theory of thermophysics. The soil heat flux plate method was employed to validate the heat pulse method. The results indicated that the soil heat flux calculated by the heat pulse method generally agreed well with the soil heat flux plate method. Compared with the soil heat flux plate, the bias of heat pulse method was 0.674 W·m-2. It proved that the heat pulse method was able to provide accurate soil heat flux measurement. Analysis on the phase of soil heat flux showed that the time of the maximum value occurred had 1 hour's hysteresis for the soil temperature compared to the soil heat flux. Due to the advantage of lower soil disturbance and contact resistance, the heat pulse method will have a wide prospect.

1. Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China

2. Institute of Agro-resources and Environment, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang 050051, Hebei, China

Received Date: 2012-07-13

Abstract: The principles and methods of measuring soil heat flux with three-needle heat pulse sensor are introduced based on the theory of thermophysics. The soil heat flux plate method was employed to validate the heat pulse method. The results indicated that the soil heat flux calculated by the heat pulse method generally agreed well with the soil heat flux plate method. Compared with the soil heat flux plate, the bias of heat pulse method was 0.674 W·m-2. It proved that the heat pulse method was able to provide accurate soil heat flux measurement. Analysis on the phase of soil heat flux showed that the time of the maximum value occurred had 1 hour's hysteresis for the soil temperature compared to the soil heat flux. Due to the advantage of lower soil disturbance and contact resistance, the heat pulse method will have a wide prospect.

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Reference (16)

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Soil Heat Flux Measurement Based on Heat Pulse Method

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通讯作者: 陈斌, bchen63@163.com

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