Soil charcoal to assess the impacts of past human disturbances on tropical forests.

The correlation between mean plot CAI in soil layers above and below 20 cm depth was highly significant in Areas 1 and 2 ( r -Pearson = 0.56 and 0.51, respectively; P <0.001 under bilateral torus-translation test) but not in Area 3 ( r -Pearson = −0.09; P = 0.66).

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