Fig. 2From: Leaf litter chemistry and its effects on soil microorganisms in different ages of Zanthoxylum planispinum var. DintanensisContent of refractory substances in leaf litter. (Note: Sample size is three. Data are presented as mean ± standard deviation. Different letters indicate significant differences among plantation ages at P < 0.05. The values below the error bars are the coefficients of variation)Back to article page