东北主要造林树种营养元素含量的分析

STATISTICAL ANALYSIS OF NUTRIENT CONTENT OF MAJOR TREE SPECIES FOR AFFORESTATION IN NORTHEAST CHINA

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关关系和互补性。从而证明了N,P和Ca是植物重要的临界营养元素,Fe和Mn是土壤中高度积累元素,而且植物对前者的吸收对土壤有较高的依赖性,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,或白桦与各种树木混交都是合理的。

This paper presents the contents of foliar nutrients and their seasonal variations for 9 major neddle and broadleaf tree species of northeast China during a single growing season. By using the principal component analysis and cluster analysis,foliar nutrient relationships among the tree species were found,which demonstrated that N, P and Ca are importantly critical elements for plants,and Fe and Mn highly accumulated in the soil. Moreover, for N,P and Ca,amount taken up by plants highly depends on the soil, while for Fe and Mn, plants absorb them independently and selectively. From the nutrient utilization and absorption point of view, Pinus koraiensis—Juglans mandshuria, Larix gmelini—Fraxinus mandshurica,hard broad-leaved tree—soft broad- leaved tree,conifer—broadleaf tree,and Betula platyphyIla—other tree species are the rational mixed types in establishment of mixed forests.