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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (2): 522-528    DOI: 10.7522/j.issn.1000-694X.2013.00071
    
Effects of Temperature on Soil Net Nitrogen Mineralization under Different Biological Soil Crusts in Shapotou, Northern China
HU Rui1, WANG Xin-ping1, ZHANG Ya-feng1, PAN Yan-xia1, SHI Yong2, LIU Mei-ling2
1.Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2.Laboratory of Plant Stress Ecophysiology and Biotechnology, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
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Abstract  

Effects of temperature on soil net nitrogen transformation rates (nitrification and mineralization) under moss-covered soil and algae-lichen-covered soil were evaluated by measuring the concentrations of NH+4-N and NO-3-N of undisturbed soil cores incubated in artificial chamber after 14 days of incubation with a temperature gradient of -10, 5, 15, 25, 35, 40 ℃. Results showed that: (1) immobilization was the main form in the nitrogen transformation (nitrification and mineralization) under the lower incubation temperatures (-10~15 ℃), the net nitrification and mineralization rates increased significantly (p<0.05) with increasing temperature, especially when the temperature surpassed 25 ℃; (2) the moss-dominated soil facilitated the nitrogen transformation, the rates of net nitrification, nitrogen mineralization, and the contents of inorganic nitrogen in moss-dominated soil were higher than in algae-lichen-dominated soil; (3) the Q10 values of nitrogen transformation rates ranged from 2.46 to 3.33. In addition, the net nitrogen transformation rates of moss-dominated soil were more sensitive to temperature variation than algae-lichen-covered soil. Concerning the whole nitrogen transformation process, nitrification was more sensitive to temperature than mineralization. Higher temperature is beneficial to soil net nitrogen mineralization rate and the biological soil crusts can enhance the availability of nitrogen, which may affect the primary productivity in desert ecosystems.

Key words:  biological soil crusts      net nitrification rate      net nitrogen mineralization rate      temperature     
Received:  09 September 2012      Published:  19 December 2012
ZTFLH:  S152  
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Cite this article: 

. Effects of Temperature on Soil Net Nitrogen Mineralization under Different Biological Soil Crusts in Shapotou, Northern China. JOURNAL OF DESERT RESEARCH, 2013, 33(2): 522-528.

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http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00071     OR     http://www.desert.ac.cn/EN/Y2013/V33/I2/522

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