Journal of Ecology and Rural Environment ›› 2019, Vol. 35 ›› Issue (7): 885-891.doi: 10.19741/j.issn.1673-4831.2018.0432

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The Variation and Controlling Factors of Soil Respiration Rate in Urban Green Landscapes

ZHAO Long-fei1, LI De-sheng1, TENG Da2, LIU Fu-de1, ZHANG Ming3   

  1. 1. School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China;
    2. Weihai Binhai New City Construction Investment Co. Ltd., Weihai 264200, China;
    3. Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
  • Received:2018-07-23 Online:2019-07-25 Published:2019-07-22


The soil respiration rate (Rs) and its influential factors of two green landscapes (GL and YZ) were measured using a portable automated CO2 exchange station (ACE) during the whole growing season in Tianjin. The relationships be-tween soil respiration and its influential factors of soil temperature,soil moisture and soil physicochemical properties have been analyzed. Results show that:(1) There was basically no difference in the seasonal variation of Rs between the two different types of green landscapes,both of them showed an obvious single-peak variation and the peak appeared at the same time. Simultaneously,the variation of Rs was different in different months. In dry season,the Rs was low with few fluctuations,which ranged from (0.20±0.03) to (1.09±0.16) μmol·m-2·s-1 for GL,and from (-0.06±0.01) to (0.26±0.05) μmol·m-2·s-1 for YZ. Conversely,a relatively higher Rs with more fluctuations was noted in the wet sea-son,it seemed to be varied from (-0.05±0.01) to (3.62±0.26) μmol·m-2·s-1 for GL,and from (0.38±0.07) to (3.17±0.27) μmol·m-2·s-1 for YZ. In summary,the mean value of Rs in GL was significantly higher than that in YZ; (2) The environmental factors that influence Rs are very complicated in the two green landscapes. The two relatively im-portant factors are soil temperature at 10 cm depth (T10) and soil moisture at 5 cm depth (M5). In addition,the regression analysis show that the effective degree of T10 and M5 for Rs were 45.4%-64.8% and 21.1%-52.2%,respectively; (3) There was a certain correlation between soil physicochemical properties and Rs,in which the correlation coefficient between soil organic matter and Rs was highest in all the two green landscapes.

Key words: green landscape, soil respiration rate, soil temperature, soil moisture

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