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. 2022 Feb 2;158(1):39–72. doi: 10.1007/s10533-021-00884-7

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Fig. 8 — Linear regression of the Ecosystem P Nutrition Index (ENI_P) vs. stocks of a,c total soil P, and b,d forest floor P in the carbonate soils a, b and in the silicate soils investigated by Lang et al. (2017)