Diurnal variation of energy flux of Haloxylon ammodendron community in the southern margin of Gurbantunggut Desert under different weather conditions

doi:10.7523/j.issn.2095-6134.2021.04.017

Abstract

Abstract: Based on the meteorological and energy data measured by the Bowen ratio system on the southern edge of the Gurbantunggut Desert in the summer of 2018, the diurnal variation of the energy exchange and its components of the Haloxylon ammodendron community under different weather conditions was analyzed. The results show:1) The diurnal curve of energy exchange is highly similar unimodal type in sunny and cloudy days in this area. Soil heat flux is the smallest, while sensible heat is slightly higher than latent heat in sunny and partly cloudy days. In cloudy days sensible heat energy transfer is the main component. In rainy days, the overall heat flux is the smallest and characterized by multi-modal curve, in which latent heat transmission is the dominated component. 2) The daytime Bowen ratio is below 1 and the smallest in rainy days. It exceeds 1 in other three weather conditions, increasing from sunny, partly cloudy to cloudy days. During nighttime, the Bowen ratios are lower than 1 in all the days, increasing from sunny, cloudy, partly cloudy to rainy days. 3) The energy partitioning curve is relatively stable in daytime and unstable during nighttime. It fluctuates dramatically in twilight, which differs in starting time among the diverse weather conditions.

Key words: energy balance, energy partitioning, desert community, Bowen ratio, weather condition

CLC Number:

P933

LI Chuanjin, HU Shunjun. Diurnal variation of energy flux of Haloxylon ammodendron community in the southern margin of Gurbantunggut Desert under different weather conditions[J]. Journal of University of Chinese Academy of Sciences, 2021, 38(4): 567-575.

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