摘要
禾草内生真菌通过影响植物地上部分分解和根系分泌物来影响宿主植物生境土壤化学性质和微生物群落。然而,很少有详细的数据表明Epichloe内生真菌对宿主植物生境土壤的影响主要是由内生真菌介导的植物地上部分分解还是根系代谢引起的。本研究通过不同田间管理措施(植物刈割返田、刈割移除和自然生长),在刈割和返田3次后测定内生真菌侵染(E+)和未侵染(E-)样地土壤的化学性质和土壤真菌群落丰度和多样性。结果表明:1)内生真菌增加了植物刈割返田后E+样地土壤中有机碳、铵态氮和硝态氮的含量,显著增加了宿主植物自然生长土壤中铵态氮的含量;2)内生真菌显著增加了植物刈割返田后和植物自然生长土壤中真菌群落的Alpha多样性,而Beta多样性在3种处理下都有显著差异;3)内生真菌和管理措施可以直接影响土壤真菌群落的丰度和多样性,也可以通过影响土壤化学性质(有机碳、碳氮比和硝态氮)间接影响土壤真菌群落的丰度和多样性。综上所述,Epichloe内生真菌介导的植物地上部分分解和根系代谢均会对土壤化学性质和土壤真菌群落丰度、多样性产生影响,其中内生真菌介导的地上部分分解的作用强于根系代谢。
Endophytic fungi in grasses affect soil chemistry and microbial communities in host plant habitats by affecting above-ground plant litter decomposition and root exudation.However,few detailed data are available on whether the effects of Epichloe endophyte on the habitat soils of host plants are mainly caused by endophyte-mediated plant litter decomposition or root metabolism.In this study,the chemical properties and the abundance and diversity of the soil fungal community in endophyte-infected(E+)and-free(E-)sample soils were determined after three cycles of mowing with different treatment practices(mowing and return to the field,mowing and removal,and natural growth).It was found that:1)Endophyte fungi increased organic carbon,ammonium nitrogen and nitrate nitrogen in the soil of E+sample plots under the treatment of mowing back to the field,and significantly increased ammonium nitrogen content in the naturally growing soil of the host plants.2)Epichloe endophyte significantly increased the alpha diversity of the soil fungal community under the treatment of mowing and return to the field,while beta diversity differed significantly among the three treatments.3)Epichloe endophyte and management practices affected the abundance and diversity of the soil fungal community directly,or indirectly by affecting soil chemical properties(organic carbon,carbon to nitrogen ratio and nitrate nitrogen).In summary,both decomposition of above-ground plant parts and root metabolism mediated by endophyte infection affect soil chemistry and the abundance and diversity of soil fungal community,with endophyte-mediated decomposition of above-ground parts having a stronger effect than root metabolism.
作者
金媛媛
陈振江
王添
李春杰
JIN Yuan-yuan;CHEN Zhen-jiang;WANG Tian;LI Chun-jie(State Key Laboratory of Grassland Agro-Ecosystems,Engineering Research Center of Grassland Industry,Ministry of Education,Gansu Tech Innovation Center of Western China Grassland Industry,Center for Grassland Microbiome,College of Pastoral Agriculture Science and Technology,Lanzhou University,Lanzhou 730020,China)
出处
《草业学报》
CSCD
北大核心
2023年第4期142-152,共11页
Acta Prataculturae Sinica
基金
973项目课题(2014CB138702)
教育部创新团队发展计划(IRT17R50)
国家自然科学基金(30070546)资助。
关键词
田间管理措施
内生真菌
土壤真菌
根系代谢
植物枯落物分解
field management practices
Epichloe endophyte
soil fungi
root metabolism
plant litter decomposition
