omposition of mi-et al., 2006). Such e abundances of all materials) with ifferent SOM pools oide, 2012). Thus, ailability and tem-perature, and their interactions, is important for understanding long-term patterns of soil organic carbon (C) dynamics, and to accurately predict soil feedbacks to multiple climate factors. This is particularly true if rates of N flow through soils increase with warming (Groffman et al., 2009), which may induce greater N loss rates from ecosystems (Turner and Henry, 2010). Most studies examining the influence of N availability on soil microbial functioning focus on inorganic N additions, not the changing availability of organic N and the necessary microbial