本文根据历史文献、地质资料的记载和树木年轮年表,绘出了甘肃省近5000年温度变化曲线。研究结果表明,近5000年来甘肃气候经历了4个暖期和4个冷期。4个暖期为3000B.C.-1000B.C,770B.C-44B.C,582A.D.-960A.D.和1192A.D.-1427A.D;4个冷期为1000B.C.-770B.C,43B.C.-581.A.D,961A.D.-1191A.D.和1428A.D.-1870A.D.。

By using the historical records,geological data and the tree-ring chronology,we have drawn the temperature variation curve during the last 5000 years.It is concluded that four warm periods included 3000 B.C.-1000 B.C.,770 B.C-44 B.C.,582 A.D-960 A.D.and 1192 A.D.-1427 A.D.,the four cold periods included 1000 B.C.-770 B.C.,43 B.C-581 A.D.,961 A.D-1191 A.D.and 1428A.D-1870A.D..