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. 2014 Oct 17;4:6584. doi: 10.1038/srep06584

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Fitted equation: E_a = a + b × ln(Q). E_a represents activation energy; a and b are coefficients; Q represents soil substrate quality index, calculated from Eq. 10. QL, Q. liaotungensis; LP, L. principis-rupprechtii; PT, P. tabulaeformis; SS, secondary shrub forest.