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首页> 外文会议>The 5th China-Japan-Korea Grassland Conference: Knowledge Innovation of Grassland Science and Sustainalbe Development of Grassland Agriculture >Response of soil microbial community composition to nitrogen addition and increased precipitation during two hydrologically contrasting years on a Stipa baicalensis meadow steppe
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Response of soil microbial community composition to nitrogen addition and increased precipitation during two hydrologically contrasting years on a Stipa baicalensis meadow steppe

机译：黄ical草地草甸两个水文对比年间土壤微生物群落组成对氮素添加和降水增加的响应

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摘要

Changes in the nitrogen (N) level and precipitation regime are likely to alter microbial community composition with consequent influences on the functioning of the ecosystem.However, the general responses of the soil microbial community composition to an increase in N and precipitation and, especially, to their combined effects are highly variable and less synthesized.We used the phosphor lipid fatty acid (PLFA) method to evaluate the response of the microbial community composition to N addition and an increase in precipitation during two years on a Stipa baicalensis meadow steppe in northeastern China.A complete randomized block experimental design was used with the N addition, the water addition and a combination of N and water additions.Our results showed that N and water additions exhibited significant interactive effect on the soil total PLFAs.The water addition decreased the soil total PLFAs and bacterial PLFAs in 2011, whereas N addition increased bacterial PLFAs in 2012.In addition, N and water additions had significant combined effects on the soil physicochemical properties, such as soil water content, soil pH, soil organic carbon, N and phosphorus.In particular, water addition altered soil resource availability which results in the variations of microbial PLFAs composition.Moreover, soil resource availability were more sensitive to N and water additions than plant communities, suggesting that the effects of the N addition and increased precipitation on soil microbial community composition could be explained by the variations in soil physicochemical properties rather than vegetation characteristics.Overall, we predict that the soil microbial community composition is primarily regulated by the changed precipitation regime in the meadow steppe as a result of the potential impact of global change.
机译：氮（N）水平和降水方式的变化可能会改变微生物群落组成，进而影响生态系统的功能，但是土壤微生物群落组成对氮和降水增加的普遍反应，特别是我们使用磷脂脂肪酸（PLFA）方法评估了东北东北针茅草甸草原上微生物群落组成对氮添加和降水增加的响应。中国采用完整的随机区组试验设计，研究了氮，水的添加以及氮和水的添加的组合，结果表明，氮和水的添加对土壤总PLFAs表现出显着的交互作用，而水的添加会降低土壤中的PLFAs。 2011年，土壤中的PLFA和细菌PLFA总量，而N的添加在2012年增加了细菌PLFA。此外，氮和水的添加对土壤理化特性有显着的综合影响，例如土壤水分，土壤pH，土壤有机碳，氮和磷，特别是水的添加改变了土壤资源的利用率，导致微生物PLFA的变化。此外，土壤资源有效性对氮和水的添加比植物群落更敏感，这表明氮的添加和降水增加对土壤微生物群落组成的影响可以用土壤理化性质的变化而非植被特征来解释。总体而言，我们预测，由于全球变化的潜在影响，土壤微生物群落组成主要受草甸草原降水方式变化的调节。

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  • 来源
  • 会议地点 Changchun(CN)
  • 作者

    Shengnan Sun; Fu Xing; Hongkun Zhao; Ying Gao; Zhenjian Bai; Yingshan Dong;

  • 作者单位

    Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Ministry of Education, Northeast Normal University, No.5268, Renmin Street, Changchun, Jilin Province, 130024, P.R.China;

    Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Ministry of Education, Northeast Normal University, No.5268, Renmin Street, Changchun, Jilin Province, 130024, P.R.China;

    Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Ministry of Education, Northeast Normal University, No.5268, Renmin Street, Changchun, Jilin Province, 130024, P.R.China;

    Biotechnology Research Center, Jilin Academy of Agricultural Sciences, Changchun, Jilin Province, 130033, P.R.China;

    Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Ministry of Education, Northeast Normal University, No.5268, Renmin Street, Changchun, Jilin Province, 130024, P.R.China;

    Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Ministry of Education, Northeast Normal University, No.5268, Renmin Street, Changchun, Jilin Province, 130024, P.R.China;

    Biotechnology Research Center, Jilin Academy of Agricultural Sciences, Changchun, Jilin Province, 130033, P.R.China;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 草地;
  • 关键词

    nitrogen addition; water addition; microbial community composition; resource availability; structural equation modeling;

    机译：氮添加；水添加；微生物群落组成；资源有效性；结构方程模型;

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