| This study was conducted to examine the characteristics of climate change regarding air temperature,precipitation and sunshine during maize growing season in Hulan of Harbin. The data included precipitation, sunshine,daily mean air temperature, the lowest and the highest temperatures in the past four decades from1971to2011provided by the meteorological station in Hulan City. The statistical parameters such as climate trend rate, trend coefficient and Five year moving average were used on the basis of Crop cultivation and Agricultural meteorology.1.41a=10℃effective accumulated temperature in Hulan District, the overall trend is increased, the changes in2378.5～3007.2℃.d, from the beginning of1991the rapid temperature increase. The whole growth period in Hulan area average temperature range is17.808～21.79℃, the temperature during the whole growth overall is on the rise, the temperature was gradually warming trend in Hulan district. The maximum temperature and minimum temperature in the past41years are increased, the highest and lowest temperature is the temperature increase was the strongest in the seedling stage, the general trend of warming trend of minimum temperature is higher than the highest temperature warming degree.2.Accumulated temperature of=10℃climate tendency rate of84.401℃/10a, the whole growth period of daily mean temperature climate tendency rate of0.544℃/10a, temperature increase the highest temperature is comparatively slow,0.346℃/10a, lowest temperature warming rate of0.653℃/10a, more than the daily average temperature warming rate.3.41years of precipitation in Hulan region during the whole growth period decreased, linear precipitation decreased by-3.109mm/10a, the precipitation in growth period decreased, the linear growth rate of-1.052mm/10a, rather than the precipitation in growth period increased rapidly, increasing at the rate of3.805mm/10a; seasons in the spring, winter precipitation showed an increasing trend, the spring growth obviously, respectively6.612mm/10a and0.909mm/10a, autumn precipitation and precipitation during growing period change is consistent, declines sharply, falling speed is4.194mm/10a.4.The increasing trend of precipitation in Maize Jointing Stage, the climate trend rate is3.149mm/10a, followed by seedling, trend coefficient is0.839mm/10a, indicating that the two period41years precipitation showed an increasing trend; tendency coefficient blossom stage and filling stage were-3.769mm/10a and-3.328mm/10a, the precipitation change blossom stage and filling stage41years a downward trend.5.41years in the whole growth period of Maize in Hulan District illumination decreased, decreased greatly for the-0.329h/10a, in the range of6.29-9.3h/d. Three factors, light is the four periods are declining state, is the largest decline in jointing stage was-0.55h/10a, second is the blossom period of-0.322h/10a, seedling stage and grain filling stage decreased almost, drop extent is respectively-0.294h/10a and-0.246h/10a. |
