Journal of Ecology and Rural Environment ›› 2017, Vol. 33 ›› Issue (11): 1001-1006.doi: 10.11934/j.issn.1673-4831.2017.11.006

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Non-Additive Effects of Land Use and Temperature on N2O Emissions in the Agricultural Soils

TAO Bao-xian1, ZHANG Bao-hua2   

  1. 1. College of Environment and Planning, Liaocheng University, Liaocheng 252059, China;
    2. Department of Science and Technology, Liaocheng University, Liaocheng 252059, China
  • Received:2017-04-14 Online:2017-11-25 Published:2017-11-24


Land use and temperature are two main factors affecting soil N2O emission. However, so far little information is available in the literature about interactive effects of land use and temperature on soil N2O emission. A long-term (400 days) incubation experiment was conducted to determine interactive effect of land use and temperature on soil N2O emission relative to type of land use. Soil samples were collected in Shouguang of Shandong, one of the largest vegetable production regions of China, from lands under different types of land use including farmland (FL), 6 year-old greenhouse cultivation (6GH) and 12 year-old greenhouse cultivation (12GH) and abandoned 12 year-old greenhouse cultivation (AG). Results of the incubation experiment show that both elevated temperature and change of land use in type from FL to 6GH and 12GH significantly promoted soil N2O emission (P<0.05). 6GH was significantly higher than 12GH (P<0.05) in N2O emission, and AG was significantly lower than FL (P<0.05). Q10 of N2O emission was higher in 6GH than in FL, but lower in AG than in FL (P<0.05). Moreover, Q10 in 12GH was similar to that in FL. Furthermore, the interactive effect of elevated temperature and change of land use from FL to 6GH on N2O emission was synergistic effect on N2O emission, which turned into an additive one when 6GH became 12GH and into antagonistic one when 12GH was turned into AG, which was attributed to the variation of Q10 with the alteration of land use from FL to 6GH, 12GH and AG. All the findings in this study demonstrate that the study on effect of a single factor on N2O emission may underestimate soil N2O emissions, while the study on comprehensive effect of multifactors on N2O emission may over the emission.

Key words: land use type, elevated temperature, soil N2O emission, non-additive effect, Shouguang City

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