| 摘要: |
| 【目的】研究丛枝菌根真菌（AMF）对丝棉木生物量及栗钙土水稳性团聚体特征的影响，为退耕还林工程有效实施提供理论依据。【方法】以山西大同栗钙土为供试土壤，以丝棉木为供试植物进行盆栽试验，设接种摩西球囊霉、幼套球囊霉和根内球囊霉处理和不接种AMF处理（对照），测定丝棉木生物量、根系AMF定殖率及土壤菌丝密度、有机质（SOM）、总球囊霉素（TG）、易提取球囊霉素（EEG）含量，分析土壤水稳性团聚体含量（WSA）及其特征参数（平均重量直径（MWD）、几何平均直径（GMD）、分形维数（D））的变化。采用Pearson法分析AMF定殖状况、球囊霉素含量与水稳性团聚体特征参数间的相关性。【结果】接种幼套球囊霉和根内球囊霉处理丝棉木总生物量较对照显著增加；3种AMF的定殖率为72.79%~78.80%，菌丝密度为23.78~29.77 cm/g。与对照组相比，3种AMF处理土壤SOM、TG和EEG含量均显著增加。3种AMF均有利于土壤水稳性团聚体的形成，效应由大到小表现为根内球囊霉＞幼套球囊霉＞摩西球囊霉；与对照相比，3种AMF处理土壤水稳性团聚体的MWD、GMD升高，分形维数均降低。相关性分析表明，AMF定殖率、菌丝密度、TG含量、EEG含量与MWD、GMD和粒径＞0.25 mm土壤WSA含量均呈显著或极显著正相关关系，与D均呈显著或极显著负相关关系。【结论】3种AMF对土壤结构均有不同程度的改善作用，其作用大小表现为根内球囊霉＞幼套球囊霉＞摩西球囊霉。 |
| 关键词: 丛枝菌根真菌 栗钙土 水稳性团聚体 球囊霉素 丝棉木 |
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| 基金项目:国家自然科学基金项目（31901227）；山西大同大学2019年度校级青年科学研究项目（2019Q5）；山西大同大学校级产教融合科研项目（2019CXK17） |
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| Effects of arbuscular mycorrhizal fungi on soil aggregation characteristics in chestnut soil |
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WU Na,LI Zhen,WANG Juan,et al
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| Abstract: |
| 【Objective】The effects of arbuscular mycorrhizal fungi (AMF) on biomass accumulation of Euonymus maackii and characteristics of soil aggregates in chestnut soil were investigated to provide basis for effective implementation of returning farmland to forest.【Method】A pot experiment was carried out with chestnut soil from Datong,Shanxi Province as the test soil and Euonymus maackii as the test plant.All pots were inoculated with/without AM fungus (Funneliformis mosseae,Claroideoglomus etunicatum or Rhizophagus intraradices).E. maackii biomass accumulation,AMF colonization rates in roots,as well as mycelium density,organic matter,total glomalin and easily extractable glomalin contents in rhizosphere soil were measured and variations of soil water stable aggregates and their characteristic parameters of mean weight diameter (MWD),geometric mean diameter (GMD) and fractal dimension (D) were analyzed.The correlations among AMF colonization status,glomalin contents and soil aggregates characteristics were also analyzed by Pearson method.【Result】Total biomass of E. maackii inoculated with R. intraradices and C. etunicatum was significantly higher than non-mycorrhizal plants.The colonization rates of the three AMF species were 72.79%-78.80%,and the hyphal density was 23.78-29.77 cm/g.Compared with non mycorrhizal plants,SOM,TG and EEG contents in rhizosphere soil of E. maackii inoculated with the three AMF species were significantly increased.All AMF species were beneficial to the formation of water-stable aggregates with the effects in order of R. intraradices＞C. etunicatum＞F. mosseae.MWD and GMD of soil water stable aggregates from AMF inoculated treatments were significantly higher,while D features were significantly lower than non inoculated ones.Correlation analysis showed that AMF colonization rate,mycelium density,TG and EEG contents had significantly positive correlations with MWD,GMD and WSA＞0.25 mm,while had significantly negative correlations with D.【Conclusion】The three AMF strains had different ability to improve soil structure with effects in the order of R. intraradices＞C. etunicatum＞F. mosseae. |
| Key words: Arbuscular mycorrhizal fungi chestnut soil water stable aggregation glomain Euonymus maackii |
