东北主要造林树种的营养元素含量特征分析

 本文分析测定了东北地区9个主要针阔叶树种的营养元素含量和季节动态，并应用主成分分析和系统聚类分析方法，分析了各树种之间的营养元素相互关系。从而证明了N，P，Ca是植物重要的临界营养元素，Fe和Mn是表土中高度积累元素，树木对前者的吸收与土壤表土中含量有关，而对后者则表现相对的独立性和选择吸收能力。从营养元素的吸收与利用角度考虑，红松与胡桃楸混交，落叶松与水曲柳混交，硬阔叶树与软阔叶树混交，针阔叶树之间混交或白桦与其它各树种混交都是合理的。

CHARACTERISTIC ANALYSIS OF NUTRIENT CONTENTS OF MAJOR TREE SPECIES IN NORTHEAST CHINA

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.