Seasonal variations in carbon, nitrogen, and phosphorus of <i>Pinus yunnanenis</i> at different stand ages.

The N:P ratio in stems from the middle forests increased, and stems in the young forests showed an increasing and then a decreasing trend.

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yunnanenis Different seasons and organs had highly significant effects on the C, N, and P contents, and the interaction between age and growing season only had highly significant effects on N content, both season and organ had significant effect on N and P contents, respectively.

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