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应用生态学报 ›› 2018, Vol. 29 ›› Issue (2): 547-553.doi: 10.13287/j.1001-9332.201802.022

• 研究报告 • 上一篇    下一篇

O3浓度升高对小麦根际土壤酶活性和有机酸含量的影响

尹微琴1,2, 景浩祺1, 王亚波1, 魏思雨1, 孙月1, 王圣森1,2, 王小治1,2*   

  1. 1扬州大学环境科学与工程学院, 江苏扬州 225127;
    2扬州大学农业科技发展研究院, 江苏扬州 225127
  • 收稿日期:2017-03-31 出版日期:2018-02-18 发布日期:2018-02-18
  • 通讯作者: E-mail: xzwang@yzu.edu.cn
  • 作者简介:尹微琴, 女, 1971年生, 硕士, 高级农艺师. 主要从事农业资源与环境研究. E-mail: wqyin@yzu.edu.cn
  • 基金资助:

    本文由国家自然科学基金项目(41371294)资助

Effects of elevated ozone concentrations on enzyme activities and organic acids content in wheat rhizospheric soil.

YIN Wei-qin1,2, JING Hao-qi1, WANG Ya-bo1, WEI Si-yu1, SUN Yue1, WANG Sheng-sen1,2, WANG Xiao-zhi<sup>1,2*   

  1. 1College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China;
    2Institutes of Agricultural Science and Technology Development, Yangzhou University, Yangzhou 225127, Jiangsu, Chian
  • Received:2017-03-31 Online:2018-02-18 Published:2018-02-18
  • Contact: E-mail: xzwang@yzu.edu.cn
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (41371294).

摘要: 近地层臭氧(O3)浓度升高作为全球气候变化的重要因素之一,对土壤生态环境和农作物生长发育造成了很大影响.本研究采用开顶式气室(OTCs)法,探究臭氧浓度升高对小麦不同生育期(分蘖期、拔节期、孕穗期和成熟期)根际土壤酶活性(过氧化氢酶、多酚氧化酶、脱氢酶和转化酶)和有机酸含量(草酸、柠檬酸和苹果酸)的影响规律,并结合根际土壤理化性质、植株根系生长状况等分析其产生影响的原因.结果表明: O3浓度升高不同程度地提高了小麦成熟期土壤过氧化氢酶、多酚氧化酶、脱氢酶和转化酶活性,其中过氧化氢酶和多酚氧化酶活性提高达显著水平;在抽穗期,脱氢酶和转化酶活性因臭氧浓度升高而显著提高,增幅最高可达76.7%.在成熟期,O3浓度升高显著提高了根际土壤中柠檬酸和苹果酸含量;显著降低了根际土壤pH、电导率、总碳和总氮含量,增加了土壤氧化还原电位(Eh);显著降低了小麦根系生物量、总根长和根总表面积,而增加了根平均直径.

Abstract: The elevated concentration of tropospheric ozone (O3) is an important global climate change driver, with adverse impacts on soil ecological environment and crop growth. In this study, a pot experiment was carried out in an open top chamber (OTC), to investigate the effects of elevated ozone concentration on soil enzyme activities (catalase, polyphenol oxidase, dehydrogenase and invertase), organic acids contents (oxalic acid, citric acid and malic acid) at different growth stages (tillering, jointing, heading and ripening stages) of wheat, and combined with the rhizospheric soil physicochemical properties and plant root characteristics to analyze the underlying reasons. The results showed that, elevated ozone concentration increased soil catalase, polyphenol oxidase, dehydrogenase and invertase activities at wheat ripening period to different degrees, with the effects on the activities of catalase and polyphenol oxidase being statistically significant. At the heading stage, activities of dehydrogenase and invertase were significantly increased by up to 76.7%. At the ripening stage, elevated ozone concentration significantly increased the content of citric acid and malic acid and redox potential (Eh) in rhizospheric soil, but reduced soil pH, electrical conductivity, total carbon and nitrogen. For root characteristics, elevated ozone concentrations significantly reduced the wheat root biomass, total root length and root surface area but increased the average root diameter.