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《Chinese Journal of Ecology》 2015-06
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Effects of nitrogen addition on soil respiration and its temperature sensitivity in a sandy grassland

LIN Li-tao;SUN Xue-kai;HU Ya-lin;YU Zhan-yuan;ZENG De-hui;Daqinggou Ecological Station,Institute of Applied Ecology,Chinese Academy of Sciences;University of Chinese Academy of Sciences;State Key Laboratory of Forest and Soil Ecology,Institute of Applied Ecology,Chinese Academy of Sciences;  
Nitrogen( N) addition can impact root activities and microbial metabolism,thus altering soil respiration rate. In this study we assessed the effects of N addition on soil CO2 flux in a Keerqin sandy grassland during July and September. The results showed that N addition significantly influenced the soil respiration rate. Compared with unfertilized plots( 2.18 μmol·m-2·s-1),the respiration rate of N-addition plots was increased by 15.2% and the increment of respiration rate in the daytime( 17.1%) was higher than that at night( 14. 4%). N addition significantly increased soil respiration from July to September. The monthly variation in soil respiration firstly rose then declined,and peaked on the 18 th July( 3.36 μmol·m-2·s-1). N addition increased the temperature sensitivity of soil respiration and the basal soil respiration,with Q10 values as 3.27 and 3.30,and R10 values as 0.42 and 0.54 μmol·m-2·s-1in N-addition and unfertilized treatments,respectively.
【Fund】: 中国科学院战略性先导科技专项(XDA05050401 XDA050570100);; 国家自然科学基金项目(30800143 41271318)资助
【CateGory Index】: S154
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