利用嫁接法提高果树抗寒力,防止冻害,我国农民有许多宝贵的经验和高超的技术。嫁接法所以能在防寒中起作用,原因是植物地下部根系和地上部树冠之间的抗寒力有很大差别,地下部根系比地上部树冠的抗寒力小得多。当植物(如果树)遭受低温冻害时,往往是根系先受冻害,然后导致地上部分的死亡。在嫁接中,由于选用适应当地寒冷条件的野生种作砧木,即用野生 Use of grafting to improve the cold hardiness of fruit trees to prevent frost damage, our farmers have many valuable experience and superb technology. Grafting so it can play a role in the cold, because the underground plant roots and aboveground canopy cold resistance are very different, underground roots than the aboveground canopy hardiness is much smaller. When the plant (if the tree) is subjected to low temperature freezing damage, it is often the root that is first frostbite, which then leads to the death of the aerial part. In the grafting, due to the selection of wild species adapted to local cold conditions for rootstocks, that wild