根据黑龙江省各主要作物成熟期的时空分布情况，讨论了初霜冻对主要作物安全成熟的影响。
Based on spatiotemporal distribution of most crops' mature period in Heilongjiang Province, influences of early frost on most crops' safety maturity are discussed.
冬小麦晚霜冻害由最低温度和小麦发育期两个因素确定，从数据库中查询不出晚霜冻害的确切资料。
Winter late freezing disaster (WFD) is decided by the minimum temperature and winter development periods, detailed data of WFD cann't be obtained from database.
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