关键词: 宝鸡市, 宝鸡市, 农村留守儿童, 生存现状

Abstract: Based on the daily mean air temperature data of 62 meteorological stations in Heilongjiang Province from 1961 to 2015, the spatial and temporal variations of heating indexes in Heilongjiang are analyzed by using climate tendency rate, accumulative anomaly, Mann Kendall test and the establish multiple linear regression model. The results show that, since 1961, the first heating day in Heilongjiang is significantly delay, the last heating day is significantly ahead of schedule, winter in Heilongjiang became warmer and warmer and heating duration shorter and shorter, the heating intensity for winter heating decrease about 498.4℃. The heating intensity decrease gradually from north to south and the zonal distribution is quite obvious. All areas of Heilongjiang show a decreasing trend, and the rate of change is between -50～-169℃.d. (10a)_-1. The mutation of heating intensity occurs in 1988, after the mutation the heating intensity significantly decrease. Under the global warming, the energy consumption per unit area for winter heating decrease year by year, the heating cost is reduced and the energy is saved. By using statistical models between the heating intensity and air temperature, it can be estimated that with the temperature increase 1℃, the heating energy consumption will decrease about 3.9%.