黄益宗;王斐;钟敏;隋立华;伍文;

• 1:中国科学院生态环境研究中心 城市与区域生态国家重点实验室
• 2:中国科学院研究生院

摘要(Abstract)：

近地层O3作为全球最重要的大气污染物之一,其对作物的生长发育、土壤酶活性、土壤碳、氮的影响机制已成为人们关注的重要问题。采用开顶式气室(OTCs)法模拟研究O3浓度升高对冬小麦土壤碳、氮含量和酶活性的影响。结果表明,O3浓度升高导致麦田0～10 cm和10～20 cm土层的全碳(TC)和全氮(TN)含量呈现出下降的趋势。O3浓度升高对土壤酶活性也有影响。在冬小麦灌浆期,O3胁迫可促进土壤脱氢酶活性提高。当O3浓度为120 nL·L-1时,0～10 cm、10～20 cm和20～40 cm土层的脱氢酶活性分别比对照处理提高59.4%、51.5%和22.2%。O3胁迫对土壤转化酶活性的影响随着冬小麦生长期和土壤采样深度的不同而发生变化。在冬小麦拔节期,O3处理对不同土层脲酶活性的影响没有达到显著差异水平,但是在灌浆期,20～40 cm土层的脲酶活性随着O3浓度的增加而提高,在120 nL·L-1浓度O3处理下脲酶活性比对照处理提高24.6%。在O3胁迫条件下土壤转化酶活性与土壤全碳含量、土壤脲酶活性与土壤全氮含量均呈现出显著的正相关关系。

关键词(KeyWords)： 臭氧;脱氢酶;转化酶;脲酶;全碳;全氮

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金面上项目资助项目(41071336);; 中国科学院知识创新工程重要方向资助项目(KSCX2-YW-N-41-05)

作者(Author): 黄益宗;王斐;钟敏;隋立华;伍文;

Email:

DOI:

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