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中文摘要：
测定并分析不同季节、不同树龄构树叶中总蛋白质、可溶性蛋白质和可溶性单糖含量以及超氧化物岐化酶（SOD）活性。结果表明：（1）总蛋白和可溶性蛋白质在3年生构树叶中含量高于10年生构树叶中的含量;（2）在不同树龄叶中总蛋白和可溶性蛋白质的含量均在4月份最高,此时干叶中总蛋白含量超过36%,鲜叶中可溶性蛋白含量超过14.8mg/g,以后均呈现逐渐下降的趋势,但10年生构树总蛋白和可溶性蛋白质的含量在冬季下降速度更快;（3）不同树龄构树鲜叶超氧化物歧化酶（SOD）活性差异不显著,也以春季最高,约为270U/g,以后逐渐降低,冬季SOD活性只有春季的30%左右;（4）3年生构树鲜叶单糖含量各季变化不明显,约为0.37%。10年生构树鲜叶春季单糖含量较高,可达0.60%,夏秋季略有降低,冬季单糖含量为0.22%,只有春季含量的35%,降低明显。
英文摘要：
The total protein content,the soluble protein content,the activity of SOD and soluble sugar content in the leaves of Broussonetia papyrifera of different ages were determined in different seasons. The result indicated that：（1）The contents of total protein and soluabe protein in the leaves of 3-year-old trees were higher than those in the leaves of 10-year-old trees. （2）The contents of total protein and soluabe protein in the leaves in April were the highest throughout the year in trees of deferent ages,the total protein content was more than 36 g/100g,the soluble protein content was more than 14.8 mg/g. （3）The activity of SOD in leaves showed no obvious difference among trees of deferent ages,the SOD activity in Spring was the highest throughout the year,it was about 270 U/g. （4）The annual change of soluble sugar content in leaves of 3-year-old trees was not obvious,it was about 0.37%. In the leaves of 10-year-old trees,the soluble sugar content in April was 0.60%,and 0.22% in December.
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