Synergistic variation of rhizosphere soil phosphorus availability and microbial diversity with stand age in plantations of the endangered tree species <i>Parashorea chinensis</i>.

The proportion of unextracted P to TP remained low throughout, less than 7.2% in all stands; the proportion of IP was always higher than that of OP, and with increasing stand age, the IP showed a trend of increasing and then decreasing, while OP projected an opposite trend ( Figure 2D ). 3.3 Correlation of phosphorus availability with other physicochemical indicators in rhizosphere soil The results of correlation analysis ( Figure 3A ) showed that AP was significantly ( P< 0.01) positively correlated with SMBP, ACP, Al-P, and LOP; AP was significantly ( P< 0.05) negatively correlated with O-P, and negatively correlated with HROP and Fe-P.

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