An investigation was carried out on the variations of the nitrate reductase,soluble protein,chlorophyll as well as soluble sugar of 5-year-old plus trees from open pollinated progenies of Quercus variabilis populations. The results showed that there were significant differences in the nitrate reductase activity,the content of soluble protein,the chlorophyll content and the content of soluble sugar among different populations (P＜0. 05). Significant seasonal variations were observed within the same provenance. In July,several physiological indices of families reached their maximum values, and significant differences were found a-mong different families. There existed significantly positive correlations between sapling tree height and other indices, such as the nitrate reductase activity, the content of soluble protein, the chlorophyll content and the content of soluble sugar, and the corresponded correlation coefficients were 0. 547,0. 643, and 0. 492,respectively,which could be used as physiological indices in early selection of Q. variabilis.%对栓皮栎优树自由授粉子代5年生幼树的生理生化特性进行了测定.结果表明:不同种源硝酸还原酶活性、可溶性蛋白含量、叶绿素含量、可溶性糖含量均存在显著差异(p＜0.05),同一种源呈现明显的季节变化趋势；7月份各家系的几个生理生化指标均达到最大值,且家系间也存在显著差异.幼树高生长与硝酸还原酶活性、可溶性蛋白含量、可溶性糖含量存在显著正相关,相关系数分别为0.547、0.643和0.492,可以初步作为栓皮栎速生性状早期选择的指标.
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