降水变化对红松阔叶林土壤微生物功能多样性的影响

发布时间：2018-05-25 10:49

本文选题：碳源利用 + Biolog　；参考：《生态学报》2017年03期

【摘要】：红松阔叶林生态系统是中国东北地带性顶级植被,具有重要的生态学意义;长白山是研究温带森林对大气降水变化正负反馈的理想地带。以长白山红松阔叶林0—5cm、5—10cm表层土和红松根际土为研究对象,基于Biolog生态平板法,分析了不同降水量条件下土壤微生物功能多样性的变化规律及机制。结果表明,平均颜色变化率(Average well color development,AWCD)随培养时间的延长而增加,在培养初期的表现为降水减少30%样地降水增加30%对照样地,培养的末期,AWCD值的变化没有表现出明显的规律性。各降水量条件下根际土土壤微生物的AWCD值均高于表层土。Shannon多样性指数、Simpson优势度指数和McIntosh均匀度指数在不同降水量样地间均未表现出显著的差异,即降水量增减30%的情况下,未对红松林表层土和红松根际土的微生物功能多样性产生显著影响。土壤微生物利用率最高的碳源是氨基类,其次是碳水类和多聚类,其中氨基类和碳水类也是不同降水条件下微生物功能多样性表现出异质性的主要碳源。
[Abstract]:The broad-leaved forest ecosystem of Korean pine is the topmost vegetation in Northeast China, and Changbai Mountain is an ideal zone to study the positive and negative feedback of temperate forests on the changes of atmospheric precipitation. Taking 0-5 cm ~ 10 cm topsoil and rhizosphere soil of Pinus koraiensis in Changbai Mountain as research objects, the variation law and mechanism of soil microbial functional diversity under different precipitation conditions were analyzed based on Biolog ecological plate method. The results showed that the average well color development rate (ACD) increased with the increase of culture time. In the early stage of culture, the precipitation decreased by 30% and the precipitation increased by 30%. The change of AWCD value at the end of culture showed no obvious regularity. The AWCD values of microbes in rhizosphere soil under different precipitation conditions were higher than those in topsoil. Shannon diversity index, Simpson dominance index and McIntosh evenness index, there was no significant difference among different precipitation samples, that is, the precipitation increased or decreased by 30%. The microbial functional diversity of surface soil and rhizosphere soil of Pinus koraiensis was not significantly affected. The highest utilization rate of soil microorganism was amino group, followed by carbon water group and polycluster. Amino group and carbon water group were also the main carbon sources with different microbial function diversity under different precipitation conditions.
【作者单位】：东北林业大学;长白山科学研究院;
【基金】：国家自然科学基金项目(41105104) 中央高校基本科研业务费专项(2572015EA02) 长白山科学研究院开放基金项目(201506)
【分类号】：S714.3

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