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Short-term effects of CO2 elevation and N deposition on soil respiration in a midsubtropical forest.

ZHANG Fang-yue1,2,3, WANG Qing-kui1,2**, YU Xiao-jun2   

  1. (1State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110164, China; 2Huitong Experimental Station of Forest Ecology, Chinese Academy of Sciences, Huitong 418307, China; 3University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2015-06-10 Published:2015-06-10

Abstract: Carbon cycling in forest ecosystem can be influenced by atmospheric carbon dioxide (CO2) elevation and nitrogen (N) deposition. A simulation experiment was conducted to investigate the effect of CO2 elevation and N deposition on soil carbon cycling in midsubtropical forests. In this experiment, soil respiration was measured for one year using Li-Cor 8100 infrared gas analyzer. Compared with the control treatment, soil respiration rate was respectively increased by 24.4% and 27.9% in CO2 elevation and N deposition treatments, while it was increased by 46.5% in the combined treatment of CO2 elevation and N deposition. Correlation analysis showed that soil respiration was significantly positively correlated to soil temperature and negatively to soil moisture. The temperature sensitivity of soil respiration was also affected by CO2 elevation and N deposition. The temperature sensitivity of soil respiration was slightly increased by CO2 elevation, but decreased by N deposition. Our findings suggest that the release of soil organic carbon to the atmosphere through soil respiration is possibly increased in the context of CO2 elevation and N deposition in midsubtropical forest ecosystems, and the sensitivity of the response of soil organic carbon decomposition to changes in environmental temperature is decreased.

 

Key words: wheat, tillage structure, canopy structure, organic fertilizer, path analysis.