苹果梨冻害观察研究

明确了苹果梨冻害发生的主要部位 ,发生原因及其时期。花芽冻害不是小花原始体而是花轴维管束受冻。枝条受冻是次生韧皮部而不是形成层。盛果期树体冻害重 ,初果期冻害轻。冻害发生原因与第一年气候异常 ,当年低温以及化冻急等多因子有密切关系。冻害发生在仲冬至早春 ,但冻害致死在早春

Studies on freeze injure of pyrus pingguo

The main location,reasons and period of the freeze injure of pyrus Pingguo were investigated.The freeze injure of flower buds were caused more by the frozen vascular bundle of floal axis than frozen floral primordium,and the freeze injure of branches were caused more by the frozen secondary bast than cambium.For those trees which were in the full fruit period,the freeze injure was than those initial fruit trees.The reasons that caused freeze injure have a great deal to do with many factors such as the abnormal weather of last year,low tempreture and rapid thawing.The freeze injure appeared from the secondary winter to early sping,but it was in early spring that the freeze injure made the trees lethal.$$$$