Evaluation criteria of climate resources

The evaluation method of climate resources is a scientific method to judge the value of climate resources on the basis of understanding the quantitative characteristics of various meteorological elements and their changes with time and geographical distribution. The so-called value of climate resources is mainly manifested in the contribution of providing scientific basis for production layout and daily production activities. As far as agricultural production is concerned, certain light, heat, rain, temperature and meteorological conditions, soil, vegetation and hydrology are indispensable conditions for agricultural production. It affects land use, crop distribution and agricultural production activities. [ 1]

The evaluation content of climate resources depends on the different requirements of production departments. The evaluation indexes of light climate resources usually include sunshine hours, length of day and night, radiation intensity and so on. Generally, the sunshine hours are evaluated by "how much" or "abundance"; The evaluation of the length of day and night is generally divided into long sunshine and short sunshine; Generally, in the evaluation of radiation intensity, the concepts of "strength" or "quantity of heat" are obtained by comparing different seasons and different regions. All the above evaluation criteria are lack of strict quantitative relationship, and some criteria vary greatly with specific climatic conditions. Heat index is generally expressed by various temperature indexes, such as accumulated temperature, annual (monthly) average temperature, hottest month temperature, Leng Yue temperature, growing season days, frost-free period, etc. It is best to use various average temperatures and extreme temperatures to express the cold and warm conditions. Precipitation is a very important climatic factor. Because the seasonal variation of precipitation varies greatly from place to place, and it changes significantly year by year, we should consider not only the quantity, but also the variability and seasonal distribution of precipitation and the comparative relationship between precipitation and evaporation. Therefore, the evaluation of humidity is also very inconsistent, and it can generally be evaluated by dryness standard. Now people not only regard climate as an environmental condition, but also pay more and more attention to its value as a natural resource. Therefore, the evaluation, development and utilization of climate resources have important strategic significance for national economic construction.