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Home > Archive>Volume 15, Issue 6, 2023 >758-766. DOI:10.13878/j.cnki.jnuist.20220823001
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Effects of gradual increase of atmospheric CO2 concentration on soil respiration of winter wheat field
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    Abstract:

    To examine the effects of gradual increase of atmospheric CO2 concentration on soil respiration of winter wheat (Triticum aestivum) field, a gradually increased CO2 concentration experiment was conducted with automatic control system of CO2 in open top chambers (OTCs) during 2017-2019 growing seasons.In this study, a gradual increase of atmospheric CO2 concentration (C80 and C120, an increase of 40 μmol·mol-1 year by year from 2016) was set up based on the ambient atmospheric CO2 concentration (CK).The soil respiration rate (Rs) was measured by static chamber-gas chromatograph method.The results showed that gradually increased CO2 did not alter the seasonal patterns of soil respiration, but had significant effect on Rs during winter wheat bloom-growth period.In 2018-2019 growing season, compared to CK, C120 treatment significantly increased Rs by 50.2% (P=0.008) at the heading-flowering stage, and significantly increased cumulative amount of CO2 emissions (CAC) by 25.9% (P=0.044) during the wheat growing season;while in 2017-2018 growing season, compared to CK, C80 treatment had no significant effect on Rs.A positive exponential relationship was found between soil respiration rate and soil temperature.Compared to CK, gradually increased CO2 concentration reduced the temperature sensitivity coefficient of soil respiration(Q10 values).In summary, a gradual increase of atmospheric CO2 concentration of 120 μmol·mol-1 increased CAC during the growing season of winter wheat.

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WEI Zhaowei, YIN Nan, SHANG Dongyao, LIU Chao, WU Zhurong, HU Zhenghua, LI Qi, CHEN Shutao. Effects of gradual increase of atmospheric CO2 concentration on soil respiration of winter wheat field[J]. Journal of Nanjing University of Information Science & Technology,2023,15(6):758-766

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History
  • Received:August 23,2022
  • Online: December 15,2023
  • Published: November 28,2023
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