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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (3): 788-796    DOI: 10.7522/j.issn.1000-694X.2013.00113
Biology and Soil     
Effect of Rain Supplementation on Soil Respiration of Nitraria sphaerocarpa Community in Hyperarid Area of Dunhuang, China
LIU Dian-jun1,2, WU Bo1, LI Yong-hua1, LIN Guang-hui3, CHEN Shi-ping4, ZHU Ya-juan1, LU Qi1, YAO Bin1
1.Institute of Desertification Studies/Key Laboratory of Tree breading and cultivation of State Forestry Administration, Chinese Academy of Forestry, Beijing 100091, China;
2.Inner Mongolia Hydraulic Research Institute, Hohhot 010020, China;
3.Center for Earth System Science, Tsinghua University, Beijing 100084, China;
4.State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
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Abstract  

In order to analyze the effect of rain supplementation on soil respiration rate of Nitraria sphaerocarpa community, we measured soil respiration rate in bare and vegetated area in hyperarid area (Dunhuang, Gansu, China) during the growing season. The results showed that the rain  supplementation in the growing season promoted the carbon flux of bare soil and vegetated soil to change dramatically. The more the rain  supplementation, the greater the increment and the longer duration time effect to soil respiration rate. Compared with the controlled treatment, the rain  supplementation by 100%, 200% and 300% respectively made the soil respiration rate of bare soil to increase by 34%, 90% and 106% respectively, and made the soil respiration rate of shrub soil to increase by 68%, 157% and 205% respectively. The response time of bare and vegetated soil respiration to rain  supplementation was asynchronous. Response variable of soil respiration in vegetated soil was higher 118% than soil respiration in bare soil. There was significant positive correlation between soil respiration rate and soil water content during the growing season (p<0.01). For the rain  supplementation of 1mm, the soil respiration rates of the bare soil and shrub soil respectively increased by 0.01 μmol·m-2·s-1 and 0.04 μmol·m-2·s-1.

Key words:  soil respiration      rain supplementation      Nitraria sphaerocarpa      soil water content     
Received:  31 December 2012      Published:  22 February 2013
ZTFLH:  S154.4  

Cite this article: 

LIU Dian-jun1,2, WU Bo1, LI Yong-hua1, LIN Guang-hui3, CHEN Shi-ping4, ZHU Ya-juan1, LU Qi1, YAO Bin1. Effect of Rain Supplementation on Soil Respiration of Nitraria sphaerocarpa Community in Hyperarid Area of Dunhuang, China. JOURNAL OF DESERT RESEARCH, 2013, 33(3): 788-796.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00113     OR     http://www.desert.ac.cn/EN/Y2013/V33/I3/788

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