间伐对人工林生长及木材质量具有重要影响。在浙江开化开展了间伐强度（强度、中度和对照）和间伐方式（间伐1次，间伐2次）对杉木人工林生长及出材量等的影响研究，第1试验区大径材培育林分在第7年和第14年进行了2次间伐，第2试验区中径材培育林分仅在第12年时进行1次间伐。结果表明：22年生大径材培育林分和19年生中径材培育林分不同间伐处理之间树高、总断面积的差异均不显著。间伐显著增加了林木胸径的生长，大径材培育林分强度和中度间伐处理的平均胸径分别比对照增加13.78%和9.69%，中径材培育林分强度和中度间伐处理的平均胸径分别比对照增加12.28%和7.02%。间伐显著促进了林木单株材积的增加，2组试验林分活立木材积随着间伐强度的增加而降低，第1试验区22年生林分不同间伐强度之间活立木材积的差异不显著（P>0.05），第2试验区强度间伐活立木材积显著低于对照（PP>0.05）。2组试验林分总蓄积和出材量也随着间伐强度的增加而降低，二者在3种间伐处理之间均没有显著差异（P>0.05）。间伐强度不能有效增加林分活立木材积和林分出材量，间伐次数对林分出材量及出材规格有重要影响。试验区杉木大径材培育以2次间伐，总间伐强度50%左右较为适宜，而中径材培育则以1次中度间伐（约25%）为宜。

对无患子果实生长发育动态及果肉内含物含量变化进行研究，结果表明，无患子果实纵径、横径、侧径、鲜质量等性状发育进程呈现明显的S型生长曲线特征；以果实生长发育时期为横轴（x），分别以果实纵径、横径、侧径、鲜质量的均值为纵轴（y），构建的果实生长发育数学模型表明，无患子果实生长各性状与果实发育时期高度相关，数学模型可以正确地反映无患子果实生长发育动态变化规律。对无患子果实脱落规律、果肉含水量、可溶性糖含量、皂苷含量变化规律等综合分析表明，10月下旬，无患子果实发育成熟，生长性状趋于稳定，果肉含水量和可溶性糖含量从峰值下降至相对较低水平，而果肉皂苷含量相对较高，因此提出该时期为无患子果实采摘的适宜时期。

In order to explore the salt tolerance mechanism of Machilus thunbergii, the effects of salt stress on seedling biomass, root morphology, sodium and potassium absorption and distribution were studied. The results showed that the above-ground biomass increased slightly under lower salt stress conditions, while the below-ground biomass, root length and root surface area showed a downtrend. The above-ground growth was limited under high concentration salt stress, while the under-ground growth was not subject to significant restrictions. The absorption of Na+ in root increased under salt stress, but that of K+ decreased. The ability of Na+ transporting from root to leaf and stem was weakened. The accumulation of Na+ in stem and leaves was less. With the decreased absorption of K+, the ratio of Na+/K+ also continuously increased. With the increased concentration of salt stress, the ability of K+ absorption in roots increased. The ability of K+ transporting from root to leaf and stem was enhanced, which resulted in significant increase of K+ in the leaves and stem. The accumulation of Na+ in the under-ground was significantly greater than that in above-ground, while the K+ content in above-ground increased significantly, which played a key role in maintaining normal growth and metabolism of M. thunbergii.