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Dynamics of soil CO2 concentration and CO2 efflux in non-growing season of the Yellow River Delta wetland.

WANG Xian-he1, WANG Xiu-jun2*, HAN Guang-xuan3, WANG Jun-yi2, SONG Wei-min3, YOU Zai-jin1   

  1. (1School of Civil Engineering, Ludong University, Yantai 264025, Shandong, China; 2College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China; 3Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Chinese Academy of Sciences, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, Shandong, China).
  • Online:2018-09-10 Published:2018-09-10

Abstract: To address the issue of lacking data in the non-growing season, we conducted anexperiment in a coastal wetland of the Yellow River Delta from October 29, 2016 to February 9, 2017, by continuously monitoring soil CO2 concentration and temperature at different soil depths (15, 30, and 45 cm). In order to understand the dynamics of CO2 efflux and to assess its relationship with soil CO2 concentration, we measured CO2 efflux in March 3-5 and March 16-18, 2017. The results showed that soil CO2 concentration significantly increased with the increases of soil depth. At the same depth, soil CO2 concentration was significantly higher in autumn than in winter. There was strong diurnal variation in CO2 efflux, which was consistent with the variation of surface soil temperature. The temperature sensitivity coefficients (Q10) of soil respiration were 3.49-3.74. There was a significant positive correlation between CO2 efflux and soil CO2 concentration or soil temperature. Using the derived relationships, we estimated CO2 efflux for the non-growing season, and found that the three models produced similar magnitudes and variations, i.e., 0.44 to 0.57, -0.18 to 0.01 and 0.09 to 0.13 μmol·m-2·s-1 for the maximum, the minimum and the mean values, respectively. Our results demonstrated the effects of soil carbon transformation in nongrowing season on carbon cycling of the Yellow River Delta wetland.

Key words: forest community, plant flora, geographic pattern, hotspot area, Taihang Mountains