论文部分内容阅读
我国北方冬麦区,多数地方冬季无稳定积雪,冷空气活动频繁,冬麦常发生冻害,轻者减产,重者翻耕毁种,损失很大。据统计,建国以来,北京冬麦因冻害减产三成以上的有5次;唐山地区较重的冬麦冻害有9次;甘肃陇东地区较严重的冬麦冻害达11次;山西晋中,1977年和1980年冬麦因冻害死苗面积分别占播种面积的33％和20％;新疆近二十年来发生5次大范围的冬麦严重冻害,大约每四年发生一次,1982年北疆冬麦严重冻害损失面积达72万亩。
Winter wheat in the northern part of our country, most places have no stable snow in winter, cold air activities are frequent, winter wheat often freeze damage, the light production cuts, heavy tillage deforestation, a great loss. According to statistics, since the founding of the People’s Republic of China, Beijing winter wheat has suffered 5 times of cold cut over 30%, while winter wheat with relatively heavy winter wheat has 9 times in Tangshan area and 11 more times in winter in Gansu and Jinzhong of 1977 In winter and winter wheat winter frostbite killed 33% and sowing area accounted for 33% and 20% respectively; in Xinjiang over the past two decades, five large winter wheat serious frostbite occurred, about once every four years, Severely frost damage area of 72 million mu of wheat.