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Fig. 1. Soil content of C (upper left), C derived from C₄ plants (upper right), C derived from C₃ plants (lower right), and N (lower left). Points are averages of 18 plots, with each plot as the average of three cores. The 30- to 45-cm depth was not sampled in Year 0. Soil C did not change across time, as the increase in C₃–derived C was matched by the loss of C₄–derived C. Soil N did not change.

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