关键词: 
≥10℃ accumulated temperature /
climatic mean /
distribution /
isoline /
Northeast China

摘要: The objective of this study was to provide reliable basis for decision making for national food security and layout and structure adjustment of grain production in Northeast China. The data of mean daily air temperature of 1961-2009 from 106 meteorological stations in Northeast China were chosen in the study. Using statistical methods and isoline method, the course of change of various decadal accumulated temperature above 10 degrees Celsius (≥10℃) and distribution and change of climatic means of ≥10℃ accumulated temperature were studied in this paper. The results showed that 1) geographical distribution of means of various decades and climatic means of ≥10℃ accumulated temperature were mainly subjected to latitude, longitude and altitude in study area; 2) means of decadal ≥10℃ accumulated temperature rose obviously since the 1980s, their warming amplitudes became larger in the 1990s and 2010s; compared with those of the 1980s, ≥10℃ accumulated temperatures in mountain and plain areas increased by about 100℃ in the 1990s; compared with those of the 1990s, the accumulated temperatures increased by about 200℃ in Hulunbeier high plain and Songnen Plain, and 100℃ in Sanjiang Plain and Liao He Plain in the 2010s; 3) means of the decadal accumulated temperatures for 106 meteorological stations in Northeast China increased with the rate of 145.57℃/10year since 1961; 4) compared with the positions of the isolines of climatic mean of 1961-1990, maximum shifts northward of 3100℃, 3300℃ and 3500℃ isolines were 145km, 154km and 100km respectively, maximum extension eastward of 3100℃ and 3300℃ isolines were 109km and 54km and their extension westward were both 64km; 5) compared with the climatic mean of ≥10℃ accumulated temperature of 1961-1990, the mean of the accumulated temperature of 1981-2009 increased by above 100℃ in most parts of the study area; most parts of Songnen Plain, Songliao Watershed and Xiliao He Plain were the areas in which the climatic mean of the accumulated temperature changed dramatically and their accumulated temperature increased by above 150℃, the accumulated temperature in Dalian, Jinzhou, Chaoyang, Anshan, Siping, Changchun, Sunwu and Erguna stations increased by about 200℃.