| Summary: | 碩士 === 國立臺灣大學 === 森林學研究所 === 90 === The aim of this study was to ascertain the nutrient contents of leaves in the following street trees in the different seasons： Cinnamomum camphora, Liquidambar formosana ,Bischoffia javanica , and Bombax ceiba in Taipei.
The nutrient contents in these four species showed ,the following patterns nitrogen concentration in leaves was between 2.8500% ~ 3.5272%,phosphorous concentration between 0.0418% ~ 0.0761%,potassium content in leaves between 0.0650% ~ 0.1284%,calcium nutrient concentration between 0.1089% ~ 0.2390%,magnesium concentration between 0.0148% ~ 0.0457%. Except nitrogen concentrations in leaves in the described trees were normal；calcium concentrations were nearly normal；other nutrient concentrations in leaves of these four species planting as street trees were shown in deficiency condictions .
As to the seasonal changes of the distribution on these five nutrient content in leaves of these four street trees , nitrogen was higher in spring and summer but lower in autumn；calcium and magnesium were highest in autumn in all these four street trees.
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