Temporal Variations of Soil Surface Resistance to Vapor Transfer and Its Quantitative Relationship between Soil Temperature and Soil Moisture during Non-Growing Season on an Alpine Meadow

doi:10.3969/j.issn.1000-6362.2017.02.004

Abstract

Abstract: Soil surface resistance to vapor transfer is crucial for accurately estimating regional evapotranspiration while the studies of how to quantify the relationship between the soil surface resistance and soil temperature and soil moisture are still lack in alpine region. The dataset of soil evaporation measured by the eddy covariance technique over an alpine meadow during non-growing season (November to following April) in 2014 and 2015 were analyzed. The daytime (9：00-18：00) soil surface resistance was deduced from the theoretical Penman-Monteith formula of soil evaporation and the correlation with the 5cm soil temperature and 5cm soil volumetric water content was studied. The results showed that diurnal pattern of soil surface resistance was unimodal with a peak occurring at about 15：00. The response of diurnal soil surface resistance to the 5cm soil temperature could be described as a power function with an optimum soil temperature of –4.25℃(R2=0.38, P＜0.01, N=115). The diurnal soil surface resistance negatively correlated exponentially with the 5cm soil volumetric water content (R2=0.12, P＜0.01, N=115). There was no evident seasonal variation in daily soil surface resistance. The relationship between daily soil surface resistance and the 5cm soil temperature (R2=0.69, P＜0.01, N=10) and the 5cm soil volumetric water content (R2=0.27, P＜0.01, N=10) could both be depicted by exponential equation. Correlation analysis revealed that diurnal and daily soil evaporation was mainly governed by incident solar radiation (R2＞0.50, P＜0.01). These finding suggested that the soil surface resistance during non-growing season in the alpine meadow was much more controlled by soil temperature, rather than soil moisture.

Key words: Soil surface resistance, Aerodynamic resistance, Penman-Monteith formula, Eddy covariance technique, Soil evaporation

ZHANG Fa-wei, WANG Jun-bang, LIN Li, LI Yi-kang, GUO Xiao-wei, CAO Guang-min. Temporal Variations of Soil Surface Resistance to Vapor Transfer and Its Quantitative Relationship between Soil Temperature and Soil Moisture during Non-Growing Season on an Alpine Meadow[J]. Chinese Journal of Agrometeorology, 2017, 38(02): 96-103.

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