<正>采用自制固体超强酸MoO3/ZrO2为催化剂，通过改变投料比、催化剂焙烧温度和用量，以及反应温度和反应时间等条件，研究了莰烯与乙酸加成制备乙酸异龙脑酯的适宜工艺条件。结果表明：酯化反应适宜的工艺条件为：莰烯与乙酸摩尔比1：1.5，反应温度80℃，反应时间8h，催化剂焙烧温度为700℃，催化剂质量分数为4%。在上述条件下，乙酸异龙脑酯得率为74.7%。

In order to investigate the difference of wood tissue proportion of Japanese larch clone and to provide more theoretical instructions for improving wood properties genetic ot Japanese larch, genetic variations of wood tissue proportion of 10 Japanese larch clones at 10 years were investigated. The result revealed that tissue proportion had a significant difference among clones. The proportion of resin showed a highly significant difference among dif ferent rings. The prophase variation curve of proportion of tracheid appeared as"Trapezoid" and the latter variation curve appeared as "V"from pith to outward. The proportion of wood ray declined rapidly in the beginning while declined fluctuatly or rose until the second age ring from pith to outward. The proportion of resin canals declined slowly in the beginning, then it rose rapidly to maximum, but declined rapidly again afterwards. The wood ray pro portion was well fitted by hyperbola equation and power equation(R2>0.7). The proportion of resin canals was well fitted by exponential equation (R2=0. 609). The proportion of tra cheid was well fitted by cubic polynomial equation(Re=0. 845). The relationship between wood tissue proportion and growth and form was not significant. The relationship between the proportion of wood ray, the proportion of resin and the proportion of tracheid was significant. The broad sense repeatability estimates of clones were 0. 571,0. 453 and 0. 607,indicaring the proportion of wood ray, the proportion of resin and the proportion of traeheid were under middle and strong genetic control. The average genetic gains were 16.70% and 207. 72% for the proportion of wood ray and the proportion of resin if 20% of the best clones was selected.