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本文通过对540个叶样的营养元素分析.研究了油松针叶中营养元素含量与叶龄及采样部位的关系。结果表明,随着叶龄的增大,针叶中N、P、K、Mg的百分含量降低,而Ca的含量增加;针叶中N、P、K、Mg含量从树冠基部向顶部有所增加,而Ca含量有所降低;树冠中部针叶中营养元素含量与全树冠针叶元素含量的平均值相接近;不同冠向针叶中营养元素含量无显著差导。此外,文中还指出了叶分析应避免采集树冠内膛侧枝的针叶以及不同林木个体间针叶中营养元素的变化范围。
In this paper, 540 leaf samples were analyzed for their nutrient elements, and the relationship between nutrient element content and leaf age and sampling sites was studied. The results showed that the percentages of N, P, K and Mg in the needles decreased with the increase of the leaf age, while the content of Ca increased. The content of N, P, K and Mg in the needles increased from the base of the crown to the top While the content of Ca decreased. The content of nutrient elements in the middle canopy was close to the average value of the element content in the whole canopy. There was no significant difference in the content of nutrient elements in different corolla. In addition, the article also pointed out that the leaf analysis should avoid the collection of the canopy of the lateral branch of the crown and the needles of different forest individuals in the nutrient content of the range.