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本文以华北中山地区的油松人工林分作为研究对象,在林分各组分营养元素含量静态分布研究的基础上,对林分养分元素的动态特性进行了分析讨论,结果表明:(1)在一年中林木枝、叶、磷、钾、镁的含量因季节而异,其变化规律与林木的生长节律有关;(2)针叶凋落的年动态及其养分含量的变化,在一定程度上也受林木生长节律影响;(3)林地枯落物平均年干重损失率为14％,与其它林种相比,该立地上的油松林分林地枯落物分解较慢。
In this paper, the Pinus tabulaeformis stands in the middle reaches of North China as the research object, based on the static distribution of the nutrient elements in the stands, the dynamic characteristics of the nutrient elements in the stand were analyzed and discussed. The results showed that: (1) In the year, the contents of branches, leaves, phosphorus, potassium and magnesium vary with the season, and the variation regularity is related to the growth rhythm of the forest. (2) The annual dynamic of needle litter and the change of its nutrient content, (3) The average annual dry weight loss of forest litter was 14%. Compared with other forest species, the litter decomposition of Pinus tabulaeformis forest in this site was slow.