以甘肃民勤治沙综合试验站数十年气象定点观测资料为基础，统计、分析了民勤荒漠区无霜期、春季低温、冻土层的变化特征。
According to the meteorological observation in Minqin Desert Control Experiment Station, variations of frost-free period, low temperature in spring and frozen earth were analyzed.
吉林省属寒地稻作区，由于气温低、无霜期短，有25%的面积适合种植中早熟品种。
Jilin province belongs to cold district for rice plant. Because of its low temperature and short frostless period, 25 percent areas are suitable for planting middle or early maturing variety.
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