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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (2): 536-542    DOI: 10.7522/j.issn.1000-694X.2013.00073
    
Effects of Shrubs and Precipitation on Spatial-temporal Variation of Soil Temperature at the Microhabitats Induced by Desert Shrubs
ZHANG Ya-feng1,2, WANG Xin-ping1, HU Rui1,2, PAN Yan-xia1
1.Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2.University of Chinese Academy of Sciences, Beijing 100049, China
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Abstract  

Soil temperatures at the 0, 5, 10, 20 cm depths were monitored continuously at different microhabitats (beneath shrub canopy, BSC; bare intershrub spaces, BIS) induced by Caragana korshinskii, one of the dominant sand fixing shrubs in arid regions, respectively. The purpose of this study was to assess the effects of shrub on the spatial-temporal variability of soil temperature in rainy days and cloudless days. Results indicated that both precipitation and vegetation significantly affected soil temperature. In days with no precipitation, soil temperatures at the area BSC were significantly lower than in the BIS at the same soil depth due to the shading effects of shrub canopy. In rainy days, soil temperatures were affected mainly by precipitation and the shrub canopy had a negligible effect on soil temperature. Little difference in soil temperature at the same soil depth was found between the area BSC and in the BIS. Diurnal variations of soil temperature showed a unimodal sinusoidal curve in cloudless days. The amplitude of soil temperature tended to decrease and a hysteresis of the diurnal maximum soil temperature existed at deeper soil depths. Vertical fluctuations of soil temperature displayed four typical curves. In the nighttime (approximately from sunset to sunrise), surface temperature at the area BSC was higher than in the BIS. In rainy days, diurnal variations in soil temperature decreased exclusively as rainfall continued and the vertical fluctuations of soil temperature showed an increased tendency with increasing soil depth.

Key words:  desert shrub      precipitation      soil temperature      shading      beneath shrub canopy      bare intershrub spaces     
Received:  21 September 2012      Published:  11 November 2012
ZTFLH:  S715.3  

Cite this article: 

ZHANG Ya-feng1,2, WANG Xin-ping1, HU Rui1,2, PAN Yan-xia1. Effects of Shrubs and Precipitation on Spatial-temporal Variation of Soil Temperature at the Microhabitats Induced by Desert Shrubs. JOURNAL OF DESERT RESEARCH, 2013, 33(2): 536-542.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00073     OR     http://www.desert.ac.cn/EN/Y2013/V33/I2/536

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