Jin-Shan-Inner Mongolia adjacent area

a climate transition zone

is sensitive to climate change. Based on the statistics and analysis of the historical documents about freezing disasters in Jin-Shan-Inner Mongolia adjacent area

spatialtemporal distribution of the frequency

countytimes and intensity were analyzed in the light of the methods of least squares and wavelet analysis. The results show that there were 144 years with freezing disasters in 960 counties of Jin-Shan-Inner Mongolia adjacent area from 180 to 1911. Autumn and summer were frequently prone to disaster. The disasters occurred in Ming and Qing Dynasties accounted for 65.3%

with 64.2% of counties suffered. Freezing disasters in historic periods showed a rising trend

experiencing three stages

namely

low frequenting

increasing and rapidly fluctuating. Wavelet analysis shows that there existed freezing disaster cycles of 200

110

80

and 20 years in history with a principal cycle of 200 years. The spatial distribution of the historical freezing disasters varied distinctly，Yulin was the high-frequency disaster center

while Xingxian

Hequ

and Liulin were the low-frequency disaster centers. Climate change and population density

the degree of agricultural development jointly affected the occurrence of freezing disasters. The cold climate and transition have more impact on the extent of freezing disaster

population density and production development affect the frequency of disaster.