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Table S1 Average green plant N : P ratios by species

Table S2 Average green and senesced plant N and P concentrations (%) averaged across all five species

Table S3 Average N and P pools in green plant biomass of the five species combined

Table S4 Average N and P pools on Plant Root Simulator (PRS) probes (2007 and 2009) and N : C, P : C and N and P pools in microbial biomass (2009)