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唐山地处北方晚熟冬麦区东北边缘,气候特点是冬寒春早,夏湿秋吊,年际间变幅甚大。尤以晚秋、初冬和早春气候更复杂多变,直接影响冬小麦安全越冬。建国以来发生过十一次冻害,平均三年一次。1980、1981年连续发生较重冻害,间隔年限有缩短趋势。轻冻年减产一、二成,重年减产三、四成,个别年度、个别地块毁种绝收,直接影响夏粮产量。因此,本着预防和补救两个方面设计模拟冻害试验,并试图分析在我市小麦越冬死苗的主要原因,提出预防和补救措施。
Tangshan is located in the northern edge of the late northeast winter wheat northeast edge of the climate is characterized by early winter and early spring, autumn and summer wet hanging crane, greatly varying between years. Especially late autumn, early winter and early spring climate more complex and changeable, a direct impact on winter wheat winter. There have been eleven frost damage since the founding of the People’s Republic, once every three years on average. In 1980 and 1981, severe freezing injury occurred successively, and the interval of years was shortened. Light frozen annual reduction of one or two percent, heavy annual reduction of three or four into, individual year, individual block deforestation, a direct impact on summer grain production. Therefore, based on the two aspects of prevention and remediation, we designed simulated frost damage tests and tried to analyze the main causes of overwintering dead frogs in our city and put forward preventive and remedial measures.