由于冬季干旱及极端低温的影响,幼龄果树易发生冬季冻害;另外,由于全球气候变暖的影响,暖冬和春季气温回升快,晚霜引起的冻害频频发生,严重的可造成死树现象。本文针对幼龄果树冻害发生的原因,提出了综合性防治措施。1.幼树冻害发生的原因1.1幼树自身的原因幼树生长旺盛,新梢停长较晚,组织不充实,贮藏养分不足,根系浅,多数处于冻土层中,蒸发与吸收失衡,导致树体失水过多。晚霜来袭时细胞间液结冰,细胞内液外渗,液泡皱缩时间过长,导致细胞自缢死亡,表现为树干或枝梢发生冻害。花 Due to the effects of winter droughts and extreme low temperatures, young fruit trees are prone to frost damage in winter. In addition, due to the global warming, warm temperatures rise back in warm winter and spring, frostbite caused by night frost occurs frequently, causing serious dead trees. In this paper, young fruit tree frost damage causes, put forward a comprehensive prevention and control measures. 1. Sapling frost causes 1.1 Saplings own reasons Saplings grow vigorous, shoot long late, the organization is not full, lack of storage of nutrients, shallow roots, most in the frozen soil layer, the evaporation and absorption imbalance, resulting in Excessive tree water loss. Late frost strikes when the intercellular fluid freezing, extracellular fluid extravasation, vacuolar shrinkage time is too long, leading to cell self-death, manifested as freezing damage to the trunk or shoots. flower