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问:冷冻和霜冻是怎样为害甘蔗的?答:冷冻是指寒潮从北而南侵袭,使极端低温骤然下降,或持续低温的时间较长,超过或接近甘蔗植株所能忍受的冷限,所造成的冻害;霜冻则是指低于零度的冷空气向下沉降,迅速吸收甘蔗植株的温度,使植株受冻部分的组织细胞液冰结引起细胞破裂。我国蔗区受霜冻和冷冻的为害是普遍的,尽管在北回归线以南的亚热带珠江三角洲,也有出现霜冻和冷冻,其他纬度较高的蔗区就不
Q: How does freezing and frost damage sugarcane? A: Freezing refers to the cold surge which attacks north and south, causes the sudden drop of extreme low temperature, or prolongs the duration of low temperature, exceeding or approaching the cold tolerance of sugarcane plants Frost refers to the sub-zero below the cold air settling down quickly to absorb the temperature of sugar cane plants, so that the cold part of the plant cells by freezing the cells caused by cell rupture of ice. Frost and freeze damage is common in the sugar cane areas in our country. Although frost and freezing occur in the subtropical Pearl River Delta south of the Tropic Cancer, other cane areas with higher latitudes do not