玉米延迟型低温冷害的动态监测

利用东北3省51个气象站1961—2000年的资科分析了玉米延迟型低温冷害出现的频率，以及各发育期的进程与低温冷害的关系。结果表明：在低温冷害年，苗期、七叶期、抽雄期和成熟期拖后大于等于5天发生低温冷害的可能性分别为75％，89％，92％和100％。通过分析多年的分期播种资科，分别给出了播种到出苗、出苗到抽雄、抽雄到成熟的指标。根据这些热量指标和推算出的玉米的发育进程对其进行了动态监测，利用作物生长动态统计模型和生长动力模型进行了玉米生长量的计算，通过与高温年和正常年进行比较，即可对玉米生长量进行监测。

Dynamic monitoring of growth-delaying type cold damage for corn

Using the data of 51 meteorological stations from 1961 to 2000, the frequency of growth delaying type cold damage for corn was analyzed, and the relationships between the process of development stages with cold damage was also analyzed. The results showed that the probability of cold damage occurrance for seedling stage delayed 5 days, 7 leaf stage delayed 5 days, earing stage delayed 5 days and maturity stage delayed 5 days were 75%, 89%, 92% and 100% respectively. Using the stage sowing data over the years, the heat indices from sowing to emergence, from emergence to earing and from earing to maturity were given, respectively. According to these heat indices and calculated development stage process, the development stage process can be monitored. Using crop growth dynamic statistics model and growth dynamic model, the corn biomass can be computed. And compared with high temperature year or normal temperature year, the corn growth biomass can be monitored.