CHARACTERISTIC ANALYSIS OF NUTRIENT CONTENTS OF MAJOR TREE SPECIES IN NORTHEAST CHINA
东北主要造林树种的营养元素含量特征分析

This Paper presents the contents of foliar nutrients and their seasonalvariations for 9 major tree species in northeast China during a growingseason. Using the Principal Component Analysis and Cluster Analysis,thispaper demonstrated that N, P and Ca are importantly critical elementsfor plants, and Fe and Mn highly accumulated in the soil. Moreover, N,P and Ca, taken by plants are highly dependent on the soil contents ofthe elements, while uptake of Fe and Mn. is independent of the soil con-tents and is selective. From the nutrient utilization point of view, PinusKoraiensis Juglans mandshurica,Larix gmelini Fraxinus mandshurica, hardbroad-leaved tree soft broad-leaved tree, conifer broadleaf tree, andBetula platyphylla other tree species are the rational mixed types in theestablishment of mixed forests.