生态与农村环境学报 ›› 2017, Vol. 33 ›› Issue (11): 1001-1006.doi: 10.11934/j.issn.1673-4831.2017.11.006

• 自然保护与生态 • 上一篇    下一篇

不同土地利用方式及增温对农业土壤N2O排放的非加和效应

陶宝先1, 张保华2   

  1. 1. 聊城大学环境与规划学院, 山东 聊城 252059;
    2. 聊城大学科学技术处, 山东 聊城 252059
  • 收稿日期:2017-04-14 出版日期:2017-11-25 发布日期:2017-11-24
  • 通讯作者: 陶宝先,E-mail:taobaoxian@sina.com E-mail:taobaoxian@sina.com
  • 作者简介:陶宝先(1981-),男,山东淄博人,讲师,博士,主要从事土壤碳氮循环研究。E-mail:taobaoxian@sina.com
  • 基金资助:

    国家自然科学基金(41501099);山东省自然科学基金(ZR2014DQ015,ZR2016DM14);聊城大学基金(318051430)

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

摘要:

土地利用方式和温度是影响土壤N2O排放的重要因素,有必要深入研究土地利用方式变化及增温对农业土壤N2O排放的交互作用。以山东省寿光市为例,利用长期(400 d)培养实验,研究土地利用方式变化(农田、种植6及12 a设施菜地、荒废12 a设施菜地)及温度对土壤N2O排放的交互作用。结果表明,升温及农田变为设施菜地显著促进土壤N2O排放(P<0.05),且种植6 a设施菜地土壤N2O排放水平显著高于种植12 a设施菜地(P<0.05),荒废设施菜地N2O排放水平较农田显著降低(P<0.05)。相对于农田,种植6 a设施菜地土壤N2O排放温度敏感性系数(Q10)显著增加,但荒废设施菜地Q10显著降低(P<0.05),种植12 a设施菜地Q10值与农田相比无显著差异。此外,农田变为种植6 a设施菜地与增温对土壤N2O排放产生正效应(synergistic effect),种植年限延长至12 a时交互作用变为加和效应(additive effect),设施菜地荒废后交互作用变为负效应(antagonistic effect)。这是因为农田变为设施菜地及设施菜地荒废后土壤N2O排放Q10值改变所致。这表明当研究单因素对土壤N2O排放的影响和评估多因素的综合影响时,可能会低估或高估其排放水平。

关键词: 土地利用方式, 增温, 土壤N2O排放, 非加和效应, 寿光市

Abstract:

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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