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JOURNAL OF DESERT RESEARCH  2012, Vol. 32 Issue (2): 437-441    DOI:
Biology and Soil     
Response of Soil Respiration to Artificial Rainfall in Different Parts of Sand Dunes
YU Pu-jia1,2,3, XU Hai-liang1, WAGN Wei1, ZHAGN Peng1, ZHAO Xin-feng1, GONG Jun-jun4
1.Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2.Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China;
3.Fukang Desert Ecosystem Observation and Experiment Station, Chinese Academy of Sciences, Fukang 831505, Xinjiang, China;
4.School of Geography Science and Tourism, Xinjiang Normal University, Urumqi 830054, China
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Abstract  Using a LI-8100 automated soil CO2 flux system and artificial rainfall measure, we determined the rate of carbon dioxide emission in different parts of sand dunes in the southern fringe of Gurbantunggute Desert, discussed the response of soil respiration to artificial rainfall in the different parts of sand dunes, and evaluated the influence of temperature and soil moisture on soil respiration rate. Results indicated that: (1) Diurnal variation of soil respiration in different parts of sand dunes under artificial rainfall treatment showed as a double-peak curve, but the diurnal variation curves of soil respiration in different parts of sand dunes changed to single-peak curves after the artificial rainfall. (2) The change magnitude, mean value and extreme deviation of soil respiration increased in the different parts of sand dunes after the artificial rainfall. The maximum value of the soil respiration came later after the artificial rainfall. (3) The correlation between soil respiration rate and soil temperature showed positive responses to the artificial rainfall. The artificial rainfall changed the style of soil temperature curve and increased the correlation coefficient between soil respiration rate and soil temperature. (4) Soil respiration rate was significantly correlated with soil water content in the different parts of sand dunes when without artificial rainfall treatment. The correlation coefficient between soil respiration rate and soil water decreased after the artificial rainfall and only the correlation coefficient in the middle slope of sand dunes passed the significance test of  α=0.01.
Key words:  soil respiration      sand dunes      artificial rainfall      the Gurbantunggute Desert     
Received:  23 July 2011      Published:  20 March 2012
ZTFLH: 

S152

 

Cite this article: 

YU Pu-jia, XU Hai-liang, WANG Wei, ZHANG Peng, ZHAO Xin-feng, GONG Jun-jun. Response of Soil Respiration to Artificial Rainfall in Different Parts of Sand Dunes. JOURNAL OF DESERT RESEARCH, 2012, 32(2): 437-441.

URL: 

http://www.desert.ac.cn/EN/     OR     http://www.desert.ac.cn/EN/Y2012/V32/I2/437

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