| In this paper,loking at the fact that low temperature disaster-caused on cold damage changing to low temperature,scant light,cloudy and rainy, comprehensive influencing disaster-caused on cold damage, litchi and banana's cold damage had be researched.On the basis of previous'work, litchi and banana'study area had be expand form provinces to South China and its disaster-making factors had be expand to low temperature,sun light,wet with rain from one factor low temperature previously. considerate and analysis every related climate disaster- inducing factor of chilling injury comprehensive in South China,along with the corresponding relations of every factor and chilling injury, determine several new disaster-inducing factors for chilling injury based on the study;analysis 1951～2005 mean and extreme numeral of disaster-inducing factors for South China chilling injury,draw isoline distributing chart and evaluat each region; calculate integrated index HI for South China chilling injury using 3 different factor-composing methods,contrast and analysis the 3 methods,and anslysis the changing features of the time coefficient of the first and second vector for chilling injury integrated index in South China.There are several main conclusions:1) Based on the study of predecessors,select 10 new disaster-inducing factors of chilling injury related with sunlight,rainfall and some disaster-inducing factors related with temperature alse .The newly added disaster- inducing factors complement the water and light condintion during the chilling injury.2) Take MeiXian(in GuangDong province)as the test site, combine related sunlight and rainfall factors in the chilling injury process,distinguish two chilling injury process—dry coldness chilling injury process and wet coldness chilling injury process;and analysis that the historical serious dry coldness chilling injury more happened before the 80'of last century ,the difference value of sunlight to the mean light reached 60h～210h with missing rainfall in the process,using some examples; serious wet coldness chilling injury more happened in the 90' of last century, the difference value of sunlight to the average mainly was 50h below,and there were raininess in all the process.3) Based on the isoline distributing chart of the average of the diference value of sunlight to the mean in the chilling injury process of the South China in1951-2006, the area that the average temperature of the diference value of sunlight to the mean was over 2.0℃was defined the frequently-occuring area of dry cold chilling injury in the prosess; the area that the average temperature of the diference value of sunlight to the mean was less than 1.0℃was defined the frequently-occuring area of wet cold chilling injury in the prosess.4)According to the analytic method to the main ingredient,calculate the weighting coefficient of every disaster- inducing factor of chilling injury integrated index HI,find out that HI and the sustained days,accumulated chilling below 5℃of the process,the average of the diference value of sunlight to the mean in the process showed a positive correlation;HI and the extreme lowest temperature in the process,the difference value of the sum of the lowest temperature in every to the average in the process, the difference value of the sum of the extreme lowest temperature to the average in the process, the mean in all the days of the difference value of the sum of the lowest temperature in everyday to the average in the process,the mean in all the days of the difference value of the water atmospheric pressure to the average in the process showd a negative correlation.5)Calculate the chilling injury integrated index HI of Guangzhou station using the method of 3 factors-composing, according to the value of HI ,divide the chilling injury level to 3 ranks:they are serious chilling injury years when their value of HI were more than 2.0; they are secondary chilling injury years when their value of HI were between 1.0 and 2.0; they are slight chilling injury years when their value of HI were between 0 and 1.0.6)Analysis the changing featuer of HI of the time coefficient of the first and second time vector for Guangzhou station,Guangdong province,Guangxi province and South China,the result indicated the decadal features of the chilling injury in those regions.On Guangzhou station,that the years of chilling injury changing condition from strive to week were those as:the 70' of twenty century seating the first place,the 90'of twenty century to 2006 precedencing the secondary place, the 50' to the 60'of twenty century seating the third-rate place,followed with the weekest one the 80' of twenty century. Guangdong and Guangxi respectively showed the trends of increasing and declining and the changing featuer of HI of time coefficient of first eigenvector field for Guangdong and Guangxi province showed that the 70' changed strongest, the 90'seated the inferior place followed with the 60', the 80'changed least;while the area of South China basically reminded balance and the changing featuer of HI of time coefficient of first eigenvector field for South China with the sequence from strong to weak were 70', 80', 90', 60'.
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