关键词: 探究, 探究

Abstract:

To provide the scientific basis for inducting the agricultural production in winter in Huaibei plain, based on the daily meteorological observation dataset from typical site in Huaibei plain (from December to January) from 1955 to 2010, the author analyzed and disclosed the evolution characteristics of agroclimatic basic elements and agroclimatic index and their influences on agriculture by means of mathematical statistics. The results showed that: (1) in Huaibei plain, the average temperature and accumulated temperature (≥0℃) in winter obviously increased in 55 years, in which the mutational point appeared in 1986, but the sunlight time decreased and the fluctuation of inter-annual rainfall increased, so the meteorological drought became the main meteorological disaster for wheat production in winter; (2) Even though warming winter caused the winter wheat in low-growing stage, the phenomenon that the most suitable and suitable chilling days needed to complete the stage of vernalization for winter wheat exhibits an up and down trend and the fact that warming winter caused the growing stage of wheat to happen in advance increase the risks of not completing the stage of vernalization successfully and being subject to injury by frost. So the breeds whose vernalization coverd a wide temperature range should be selected in wheat introduction breeding; (3) Even though warming winter was good for agricultural facilities, the number of dimly days which was turning against agricultural facilities increased. Simultaneously the current greenhouse cropping system still had the risks of low temperature and freezing injury. So, it was necessary to guard against lower temperatures and scientifically design the greenhouse structure to fight against insufficient hours of sunshine. The winter temperature had an obvious increasing trend in Huaibei plain in Anhui Province. The agroclimatic basic elements i.e. sunlight, heat and water and agroclimatic index i.e. accumulation temperature, extreme winter cold, insufficient illumination had different changes and had both advantages and disadvantages to agricultural production in winter.