The period 1961-2007 was divided into two by the time node of year 1981,and the change characteristics of the agricultural climate resources both in period Ⅰ(1961-1980) and in period Ⅱ(1981-2007) were analyzed and compared.The results showed that under the background of global warming,the average climatic trend rate of ≥10 ℃ accumulated temperature in the middle and lower reaches of Yangtze River in temperature-defined growth season during 1961 2007 was 74 ℃·d·10 a-1,and the ≥10 ℃ accumulated temperature in...