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一、杨树抗寒特性在我区的意义 奇台,吉木萨尔,木垒三县,尽管距乌市200公里,但由于地形变化,却构成一个冷中心地区。一月份奇台最低气温平均值为26.1℃。而吉木萨尔县,69年1月2月均为-26℃。较乌市偏低-4.2℃。故在乌市能生长较好的一些树种,在奇台,吉木萨尔,木垒地区都遭冻害,或生长不良。以67年和69年两次出现极值低温-36.6°为例,仅奇台,吉木萨尔两个苗圃30余万新疆杨一年生幼苗遭害损失。吉木萨尔苗圃引入的健杨、民权杨、小美旱、银毛杨、日本杨、沙兰杨等20多个杨树品种及梓树、龙爪柳、枫杨、洋槐、五角枫、紫椴等地上部冻死,10龄新疆杨大树树干受冻。与低温出现成正比关系的杨树烂皮病大量发生,据吉木萨尔县城镇和两个公社四个大队调查,防护林带仅箭竿杨死亡和发病植株即占60.6％,严重
First, the significance of poplar cold resistance in our area Qitai, Jimusar, Mu Lei three counties, despite the 200 km from the Urumqi, but due to terrain changes, but constitute a cold center. In January, the mean minimum temperature of Qitai was 26.1 ℃. The Jimsar County, January 69 were January -26 ℃. Lower than the city of -4.2 ℃. Therefore, some species that can grow better in Urumqi are frostbite or poor growth in Qitai, Jimusar and Mule areas. In 67 years and 69 years twice the extreme low temperature -36.6 °, for example, only odd Taiwan, Jimsar two nurseries of more than 300,000 Xinjiang annual young seedlings suffered damage. Jimsar Nursery introduced Jian Yang, civil rights Yang, the United States drought small, silver hair Yang, Japan Yang, Salmonella more than 20 poplar varieties and Catalpa, dragon claw, maple, acacia, maple, purple Linden and other parts of the upper freeze, 10-year-old trunk tree in Xinjiang Yang frozen. A large number of rotted barks of poplars occurred in direct proportion to the appearance of low temperature. According to the investigations conducted by the four brigades of the towns and villages of Jimsar County and the two communes, 60.6% of the dead and diseased plants of the shelled forest belts were serious,