【摘要】 本文对华北落叶松各器官在不同时期的营养元素含量作了分析,结果表明,叶中各元素的含量顺序为N>K>Ca>P>Mg>Fe>Mn>Zn>B>Cu,其它器官为N>Ca>K>P>Mg≥Fo>Mn>Zn>B>Cu.各元素在树体内的分布状况随着生长季节有所变化,其中N、P、K、Mg、B比较一致,为叶>细枝>细根>粗枝>粗根>干.叶中N,P、K、Zn、BA生长季开始到结束表现为持续减少,而Ca、Mg、Mn则表现出累积趋势.更多还原

【Abstract】 The contents of nutrient elements in each organ of Larix principius-rupprechtii at different times were analysed. The results show that the order of the content of nutrient elements in the leaves is N>K>Ca>P>Mg>Fe>Mn>Zn>B>Cu, and N>Ca>K>P>Mg>Fe> Mn>Zn>B>Cu in other organs. The distribution regime of the elements in the tree changed by season. The contents of N,P,K,Mg and B in each organ decreased in the order of leaves, thin branches, thin roots, thick branches, thick roots and trunks. The content of N, P, K, Zn and B in the leaves decreased continuously during the growing period, but the content of Ca, Mg and Mn increased.更多还原