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Effects of nitrogen addition on soil respiration and its temperature sensitivity in a sandy grassland.

LIN Li-tao1,2, SUN Xue-kai1, HU Ya-lin1,3, YU Zhan-yuan1,3, ZENG De-hui1,3   

  1. (1Daqinggou Ecological Station, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110164, China)
  • Online:2015-06-10 Published:2015-06-10

Abstract: 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 18th 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-1 in Naddition and unfertilized treatments, respectively.

Key words: Korean pine broad-leaved forest, selective cutting disturbance, soil phosphorus, Hedley phosphorus fractionation, phosphorus availability.