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中文摘要：
以1981年为时间节点,将1961—2007年分为1961—1980年（时段Ⅰ）和1981—2007年（时段Ⅱ）两个时间段,分析和比较两个时段的农业气候资源变化特征.结果表明：气候变暖背景下,长江中下游地区1961—2007年温度生长期内≥10℃积温气候倾向率平均为74℃·d·10a^-1;时段Ⅱ≥10℃积温较时段Ⅰ平均增加了124℃·d;与时段Ⅰ相比,时段Ⅱ双季稻的安全种植界限向北推移了0.79个纬度.1961—2007年温度生长期内降水量总体表现为增加趋势;与时段Ⅰ相比,时段Ⅱ降水量增加了1.6%,降水量≥767mm（双季稻正常生长的需水量）的面积增加了1.13×104km^2.时段Ⅱ温度生长期内日照时数较时段Ⅰ平均减少了8.1%;近47年中91.1%的气象站点日照时数表现为减少趋势.与时段Ⅰ相比,时段Ⅱ温度生长期内参考作物蒸散量呈略微减少趋势,其低值区扩大、高值区缩小.时段Ⅱ稳定通过10℃初日平均较时段Ⅰ提前了2d,而时段Ⅱ≥20℃终日平均较时段Ⅰ推迟了2d,两个时段≥22℃终日基本相同.
英文摘要：
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 period Ⅱ was 124 ℃· d higher than that in period I.Comparing with that in period I,the safe planting boundary of double cropping rice in period Ⅱ moved 0.79° northward.In 1961-2007,the precipitation in temperature-defined growth season had an overall increasing trend.Comparing with those in period I,the precipitation and the area of ≥767 mm precipitation（water requirement for normal growth of double cropping rice） in period II were increased by 1.6% and 1.13 × 104 km2,respectively.The average sunshine hour in temperature-defined growth season in period II was reduced by 8.1%,comparing with that in period I.In recent 47 years,about 91.1% stations in the reaches showed a decreasing trend in sunshine hours.Comparing with that in period I,the reference crop evapotranspiration in temperature-defined growth season in periodⅡshowed a slightly decreasing trend,and its low value region expanded while its high value region narrowed.The beginning date of daily temperature over 10 ℃ was averagely 2 days earlier in periodⅡthan that in period I,while the ending date was in reverse.The ending date of daily temperature over 22 ℃ was almost the same in periods Ⅰ and Ⅱ.
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