<正>采用水蒸气蒸馏法从邓恩桉叶中提取挥发油中的油相成分，用乙醚作为溶剂从蒸馏残液中萃取挥发油的水溶性物质，并利用气相色谱一质谱（GC—MS）联用分析比较二者的化学成分。邓思桉叶挥发油油相部分的得油率为3.67%（以干重计），其中确认了52个组分。占油相部分总量的9704%，油相部分主要成分为1，8一桉叶油素（24.71%），其次为香树烯（9.10%）、γ-松油烯（8.87%）、α-蒎烯（767%）等；水溶性成分的得油率为0.s5%（以于重计），其中确认了36个组分，占水溶性部分总量的83.52%，香树烯（19.40%）和蓝桉醇（15.67%）是水溶部分的主要成分。

Poplar is one of the dominant trees which developed very quickly in China in recent years. It is important to study annual dynamics of macro-element contents in order to improve the ability of poplar plantation nutrient management. Annual dynamics of macro-element contents of clone 1-69 and clone I-72 were studied. Results indicated that the value and the annual dynamics of N, P, K, Ca and Mg in different biological components of two poplar clones were similar. Among these components, annual variations of nutrient contents in leaves were the most obvious, and its variation value was 82.6% for N, 82.2% for P, 84.7% for K, 85.7 % for Ca, and 88.7% for Mg respectively. The rule of macro-element accumulated in one-year-old and two-year-old branch was similar, dilute effects of nutrient content existed during the eugenic period of various biological components; among various biological components, mean contents of N, P, K of leaves were maximal and mean contents of Ca, Mg of one-year-old xylems were maximal. The results would provide primary data for nutrient management and productivity maintenance of poplar plantation.