核桃是我区重要的经济树种之一。采用嫁接培育的核桃苗木比实生苗木栽培的核桃树早结果5～7年,而且产量高、品质优,保证了优质品种优良特性的遗传稳定性,还可解决实生苗后代分离大的问题。核桃的越冬性与冬季低温、早春干旱大风等生态条件有密切的关系,不同品种抗寒、抗旱、抗抽条能力不一,其越冬性状受多种自然气候条件及人为栽培措施的影响,出现广泛的差异,在同一类型内,不同品种之间也有明显的差异。当前,在核桃的生产中,较为普遍的粗放管理在很大程度上加重了核桃越冬的损失,通过加强综合管理,合理运用抗旱、抗寒及树体保护等先进的科学技术,可以明显提高其越冬性,减少越冬损失。一、核桃嫁接苗越冬性的栽培 Walnut is one of the important economic trees in our district. The walnut seedlings cultivated by grafting are 5 to 7 years earlier than the walnut trees planted with seedlings, and have high yield and good quality, which ensures the genetic stability of excellent varieties and solves the problem of large separation of seedlings. The wintering of walnut is closely related to ecological conditions such as low temperature in winter and early spring drought and gale. Different varieties have different ability of cold resistance, drought resistance and anti-stripping, and their overwintering traits are affected by many natural climatic conditions and artificial cultivation measures. A wide range of differences, within the same type, there are also significant differences between different breeds. At present, the more extensive and extensive management in the production of walnut aggravates the loss of walnut overwintering to a great extent. By strengthening integrated management and using advanced science and technology such as drought resistance, cold resistance and tree protection reasonably, it can obviously improve its Winter, reducing the loss of winter. First, the walnut grafted seedlings overwintering cultivation