Analysis on the Characteristics of Climate Change in Xishawo Desert in Minqin

(1)The changing characteristics of maximum loading factors of the first 6 principal components in Principal Component Analysis (PCA) on 145 statistical items of 13 observed indexes were:annual sunshine hours decreased gradually during the 1970s and the 1980s,but it has increased evidently since the begining of the 1990s:and there was a decreasing trend in annual average temperature from the 1960s to the 1980s,but it has rised evidently since the 1990s;average wind velocity in October gradually reduced from the mid 1970 to the mid 1980s,then increased;the days of annual strong wind increased wavily;annual maximum wind velocity constantly lifted the change of rainfall in August.The local climatic conditions had a good developing trend before the middle of 1980s,but since the late 1980s it has been deteriortated.(2)The change of annual sandstorm days was similar to annual sunshine hours;the distributing characters of annual maximum temperature,annual average ground temperature and maximum temperature in July were similar to annual average temperature;the distributing character of annual strong wind days was similar to the average wind velocity in October.(3)The climatic condition had shown some improvements from the mid 1960s to the mid 1980s due to trees planted and shrubs in large scale since the 1960s,and it was deteriorating since the late 1980s concerned with the drop of groud water table and died off of man made sand fix forest.

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