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ZHANG Y Q, DENG C F, LUO Z Z, NIU Y N, LI L L, CAI L Q, XIE J H, MA X. Characterization of greenhouse gas emissions from the alfalfa field in Loess Plateau during different planting years. Pratacultural Science, 2020, 37(1): 30-40. . DOI: 10.11829/j.issn.1001-0629.2019-0215
Citation: ZHANG Y Q, DENG C F, LUO Z Z, NIU Y N, LI L L, CAI L Q, XIE J H, MA X. Characterization of greenhouse gas emissions from the alfalfa field in Loess Plateau during different planting years. Pratacultural Science, 2020, 37(1): 30-40. . DOI: 10.11829/j.issn.1001-0629.2019-0215
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Characterization of greenhouse gas emissions from the alfalfa field in Loess Plateau during different planting years

  • 1.

    Resources and Environmental Faculty of Gansu Agricultural University, Lanzhou 730070, Gansu, China

  • 2.

    Gansu Key Laboratory of Aridland Crop Science, Lanzhou 730070, Gansu, China

More Information
  • Corresponding author:

    LUO Zhuzhu　E-mail: luozz@gsau.edu.cn

  • Received Date: April 27, 2019
  • Available Online: November 07, 2019
  • Published Date: December 31, 2019
    Graphical Abstract
    • Abstract
  • Alfalfa is the main grass species in the farmlands returned to forests in Loess Plateau, whose planting area has been expanding. The experiment relied on the alfalfa (Medicago sativa) cultivation with different planting years (14, 12, and 5 a) in Loess Plateau. The objective of this study was to determine the effects of different planting years on soil greenhouse gas (CO2, N2O, and CH4) emission of alfalfa, and we discuss the main mechanisms underlying the effects of soil temperature, soil moisture, and enzyme activities under different treatments on soil greenhouse gas emission. The results showed that all the treatments showed source effects for atmospheric CO2 and N2O, but sink effects for atmospheric CH4; the flux of CO2 peaked in June and bottomed in January, whereas the flux of N2O peaked in July and bottomed in December, and the flux of CH4 peaked in July and bottomed in March. According to the planting years, the amount of total CO2 emission showed a pattern of 5 a > 14 a > 12 a; Compared with 12 and 14 alfalfa planting years, the CO2 emission of 5 alfalfa planting years increased significantly by 16.60% and 13.01%, respectively. Total N2O emission showed a pattern of 14 a > 12 a > 5 a, but there was no difference among the treatments. CH4 absorption showed a pattern of 5 a > 12 a > 14 a, in opposite correlation with the increase in alfalfa planting years. The warming potential under 5 a was higher than those under 12 a and 14 a. Stepwise regression analysis results showed that the flux of CO2 was significantly affected by soil temperature and moisture (R2 = 0.870), that of N2O was significantly affected by soil temperature (R2 = 0.930), and the flux of CH4 was significantly affected by soil temperature and urease (R2 = 0.962).
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    • References (41)
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