Abstract:

For a problem of delayed cool injury that influences agricultural production in Heilongjiang province, we discussed an usability of climatic indexes of cool injury from literatures. The technical method, detecting critical value and calculation scheme for the climatic indexes of cool injury was determined with considering some factors such as planting area of maize and rice moving to north. Based on monthly mean temperature during May to September from 1961 to 2012 at 27 meteorological stations in Heilongjiang province, the thermal index anomaly was used to detect cool injury. The cool injury indexes were closely related to latitude, longitude and altitude, thus the climatic indexes of the cool injury were established in term of a stepwise regression method. The results indicate that the estimated cool injury years determined by the climatic indexes are in a good agreement with the actual cool injury years. Thus, these indexes could be used as monitoring index. Also, the indexes only need minor input data and simple for calculation, thus they have practicability and popularization. These indexes can be used to analyze the historical change of cool injury in Heilongjiang province.

Key words: Delayed cool injury, Climatic index, Heat index anomaly