Well, it depends a lot on which system are you working with. I doubt you can find a general response to this extremely broad question. However, to start with, and referring to the arid and semiarid systems where I work I recommend you the research performed by Delgado-Baquerizo and co-workers (https://sites.google.com/site/manueldelgadobaquerizo/), you can find interesting works and references there. Really big names and smart brains in this topic are David Wardle, Wimm Van der Putten and Richard Bardgett, I´m sure you will find their works very interesting. There is also a recent review on plant-soil interactions at the light of climate change in Journal of Ecology (Garcia-Palacios et al. 2013)