Impact of lime, nitrogen and plant species on bacterial community structure in grassland microcosms

Kennedy, Nabla and Brodie, Eoin and Connolly, John and Clipson, Nicholas (2004) Impact of lime, nitrogen and plant species on bacterial community structure in grassland microcosms. Environmental Microbiology, 6.

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Abstract

A microcosm-based approach was used to study impacts of plant and chemical factors on the bacterial community structure of an upland acidic grassland soil. Seven perennial plant species typical of both natural, unimproved ( Nardus stricta , Agrostis capillaris , Festuca ovina and F. rubra ) and fertilized, improved ( Holcus lanatus, Lolium perenne and Trifolium repens ) grasslands were either left unamended or treated with lime, nitrogen, or lime plus nitrogen in a 75-day glasshouse experiment. Lime and nitrogen amendment were shown to have a greater effect on microbial activity, biomass and bacterial ribotype number than plant species. Liming increased soil pH, microbial activity and biomass, while decreasing ribotype number. Nitrogen addition decreased soil pH, microbial activity and ribotype number. Addition of lime plus nitrogen had intermediate effects, which appeared to be driven more by lime than nitrogen. Terminal restriction fragment length polymorphism (TRFLP) analysis revealed that lime and nitrogen addition altered soil bacterial community structure, while plant species had little effect. These results were further confirmed by multivariate redundancy analysis, and suggest that soil lime and nitrogen status are more important controllers of bacterial community structure than plant rhizosphere effects.

Item Type: Article
Departments or Groups: *NONE OF THESE*
Divisions: School of Science > Department of Chemical and Life Sciences
SWORD Depositor: Users 272391 not found.
Depositing User: Nabla Kennedy
Date Deposited: 10 Sep 2014 19:12
Last Modified: 22 Aug 2016 10:27
URI: http://repository.wit.ie/id/eprint/2878

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