Elevation pattern of resource allocation in <i>Picea crassifolia</i> Kom. and its coupling mechanism with soil factors in Helan Mountains, China.

The C content of the whole plant of Qinghai spruce showed an increasing trend with elevation ( P < 0.05).

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From low to high elevation, the C:N, C:P, and N:P of the whole plant of Qinghai spruce showed a trend of increasing and then decreasing ( P < 0.05).

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This is because soil organic carbon mainly comes from organic matter produced by the decomposition of soil animals and their feces, microorganisms and plant residues, and the content of organic carbon in the surface soil is much higher than that in the deeper soil layer, so soil organic carbon showed a decreasing trend with increasing soil depth.

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