论文部分内容阅读
本文应用化学分析方法研究了落叶松水曲柳混交林叶、枝、皮营养元素含量及季节动态变化。结果表明,大量元素和微量元素含量及变化与林木生长和叶的生理生态活动有关。两树种叶中P,Ca的变化规律非常明显,差别较大。在水曲柳枝中,N,K,Ca在8月初减少到最低程度;而落叶松枝中N,K在6月初降到最低。在落叶松皮中,Ca的含量不断减少,其它元素含量变化与叶的含量变化相关。两树种枝中元素含量相近,而叶中含量差别较大。
In this paper, chemical elements were used to study the nutrient content and the seasonal variation of leaves, branches and barks of Larch-Manchurian ash mixed forest. The results showed that the contents and changes of macroelements and trace elements were related to the growth of trees and the physiological and ecological activities of leaves. The changes of P and Ca in leaves of two species were very obvious, with great difference. Among the ash branches, N, K and Ca decreased to a minimum in early August, while N and K in the branches of larch decreased to a minimum in early June. In larch bark, the content of Ca is decreasing, and the content of other elements is related to the change of leaf content. The content of elements in the two tree branches is similar, but the leaf content is quite different.