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研究结果表明,木质部氮、磷、钾和镁含量从心材到边材递增,而钙含量降低。外树皮的营养元素含量均低于内树皮的测定值。干、皮中元素含量随树干高度变化不大,仅在梢头氮、磷、钾含量有显著增高,枝中元素含量随枝龄的增加而降低,不同轮枝层的二龄枝中这些元素含量变化不 大。根中氮、磷、钾、钙、镁含量随根径的增大而减少。
The results showed that the contents of nitrogen, phosphorus, potassium and magnesium increased from heartwood to sapwood and the calcium content decreased. The outer bark of the nutritional elements are lower than the inner bark of the measured value. The content of elements in stems and skins did not change much with the height of the trunk, but the contents of nitrogen, phosphorus and potassium in the shoots increased significantly. The content of elements in the branches decreased with the increase of branch age. The contents of these elements Has not changed much. The contents of nitrogen, phosphorus, potassium, calcium and magnesium decreased with root diameter increasing.