The aim of this research was to compare methods of overwinter storage of forest tree species planting stock and to specify of the optimal and the minimal temperature for freezing. Planting stock of European beech and Norway spruce were stored three times over a period of dormancy (2015/2016, 2016/2017, 2017/2018) (1) in freezers, (2) in an air-conditioned warehouse, (3) in a cave and (4) in soil (bare-rooted plants) and at a holding area (containerized plants), i.e., an open storage. During storage, the vitality of plants was determined using the root electrolyte leakage (REL) parameter, and in 2016 also by restoring growth in a sample of plants. The stored plants were always planted in a forest research plot in the spring and their basic morphological parameters and mortality were evaluated at the end of the growing season. The most suitable temperature for storage of both bare-rooted and containerized beech and spruce was in the range from −3.4 °C to −1.7 °C. The plants after overwinter storage showed no significant mortality after planting–they showed a high vitality of the fine roots and a normal increment, and were not damaged by frost, mold or other negative factors during storage.

中文翻译：

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欧洲山毛榉和挪威云杉种植种群的越冬储存：不同方法和温度条件的影响

本研究的目的是比较林木树种种植种群的越冬储存方法，并确定最佳和最低冷冻温度。在休眠期间（2015/2016、2016/2017、2017/2018）（1）在冰箱中，（2）在空调仓库中，（3）在一个洞穴和 (4) 在土壤中（裸根植物）和保存区（容器植物），即开放式存储。在储存期间，使用根电解质泄漏 (REL) 参数确定植物的活力，2016 年还通过恢复植物样本的生长来确定植物的活力。储存的植物总是在春季种植在森林研究区，并在生长季节结束时评估它们的基本形态参数和死亡率。裸根和容器化山毛榉和云杉最适合储存的温度范围为 -3.4 °C 至 -1.7 °C。越冬贮藏后的植株在定植后无明显病死现象——细根生长旺盛，生长正常，贮藏过程中未受霜冻、霉菌等不利因素破坏。