Climatic and topographic variables control soil nitrogen, phosphorus, and nitrogen: Phosphorus ratios in a Picea schrenkiana forest of the Tianshan Mountains.

In addition, the soil N: P ratios in Schrenk’s spruce forest also exhibited a decreasing trend as MAP increased ( Fig 3F ).

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In contrast to other studies, we did not observe a clear trend in the N and P concentrations and N: P ratios with the increase in elevation.

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