日本落叶松人工林针叶中矿质营养元素的季节吸收特点及其相互关系

本文测定了日本落叶松人工林针叶中N、P、K、Ca、Mg、Cu、Zn、Fe、Mn9种矿质营养元素含量并研究了生长期内元素含量的变化规律。结果表明,在生长期内各元素含量随季节变化可用修正指数曲钱描述;探讨了落叶松针叶中常量元素与某些土壤化学因子之间的关系。土壤有机质仅与土壤全量氮、水解氮表现了显著的线性相关,与落叶松针叶中的氮没有直接的线性相关。土壤中钙镁的含量则表现出明显的对针叶中磷、钾的含量的制约关系。在日本落叶松针叶中的氮、磷、钾3个元素之间,氮、磷的比值与钾的含量有显著的线性负相关,而磷与钾之间则表现为显著的线性正相关关系。

Seasonal absorbed features of mineral elements and their relationships in needles of planted Larix leptolepis.

Contents of nine mineral elements (N, P, K, Ca, Mg, Cu, Zn, Fe and Mn) in needles of planted Larix leptolepis were analysed, and variation patterns of these elements in growing season were investigated. The results show that modified exponential curves are suitable to describe the seasonal variation of elements in L.leptolpeis needles. The relationship between absorbed macroelement contents and chemical factors effecting the distribution of elements in needles is discussed, and that between contents N, P and K is also discussed.