Effects of thinning and understory removal on soil phosphorus fractions in subtropical pine plantations.

Soil available P was positively correlated with NaHCO 3 -Pi ( R 2 = 0.15, with a marginally significant level of 0.059; Figure 3B ) and soil NaOH-Pi ( R 2 = 0.19, p < 0.05; Figure 3D ) but was negatively correlated with soil residual-P ( R 2 = 0.25, p < 0.05; Figure 3I ).

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