Study on Ecological Environment Evolution in Song-Liao Plain under the Global Changes in the Past 50 Years

摘要

Based on the observation data of the China Meteorological Administration, this paper focus on the regular patterns of the climate change in the searching area, discusses the relationship between global changes and the climate change of the area, provides first-hand data for relevant research and scientific references for environmental modification and sustainable development of Song-Liao Plain. The result shows that, during the past 50 years, firstly, the average temperature of Song-Liao Plain shows an upward trend. The growth rate of both the extreme minimum temperature and the average minimum temperature are relatively high and of the four seasons, winter's growth rate is highest. Secondly, the annual precipitation shows a downward trend, however the coefficient of variation of the precipitation is increasing with not-balanced distribution of precipitation. The overall trend is increasing from northeast to southwest. Thirdly, the climate change of Song-Liao Plain corresponds to the global changes which are warmer and drier. The temperature growth rate of the plain is as 3 times as that of the world, 1.65 times as the northern hemisphere. Finally, like the trend of global and northern hemisphere, the annual precipitation of the plain is decreasing. Also, in accordance with the northern hemisphere, the seasonal change of the precipitation turns to be increasing in spring and winter and decreasing in summer and autumn.