Root exudation (net efflux of amino acids) may increase rhizodeposition under elevated CO2

By D. Phillips, T. C. Fox, Johan Six. 2006

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Stoichiometry constrains microbial response to root exudation- insights from a model and a field experiment in a temperate forest (2012, background): “…by plant roots is similar to or greater than efflux rates (Jones and Darrah, 1994; Jones et al., 2009), suggesting that roots re-absorb the amino acids they exude and that amino acids may not contribute to the stimulation of microbial activity in the rhizosphere (but see Phillips et al., 2006).”
Rhizosphere: its structure, bacterial diversity and significance (2014, background): “However, apart from carbon compounds, various kinds of nitrogen containing substances are also released by the plant roots like nitrates (Wacquant et al. 1989), ammonium ions (Brophy and Heichel 1989) and amino acids (Rovira 1956; Phillips et al. 2004, 2006).”
Carbon flow in the rhizosphere: carbon trading at the soil–root interface (2009, background): “What we really require are not measurements of gross rates of uptake, but moreover net rates of uptake (i.e. influx minus efflux; Philips et al. 2006).”