The Indexes And Risk Of Freeze Injury On Winter Amygdalus Communis L. In Shache County

BaDanwood is also called BaDan Apricot. Its formal name is Amygdalus communis L. belong to Liya Ke Tao, It's a medium-sized arbor or shrub. Due to climate and many other reasons, Amygdalus communis L. distribution in our country is very limited. Shache County, in Xinjiang proviecs, has natural conditions for Amygdalus communis L.'s grouth, planting Amygdalus communis L. has a long history. But in recent years, due to cyclical low temperature, some Amygdalus communis L. even freeze to death, resulting in total destruct ion.The study find 3 most widely planted Amygdalus communis L. communisl sample, analysis freezing through low temperature experimental research. At the same time, inorder to make a further exploration to Amygdalus communis L.'s freezing indication and to analysis the risk of frost damage. we make a reaseach to the Amygdalus communis L.'s freezing and also consider the 50years meteorological data. The main results are as follows:1. Analysis the extreme minium temperature, low temperature, precipitation during the frost damage of Amygdalus communis L. in 2006 and 2008's winter, combined with the changes of the freezing index the historical period (1961-2009).We get the indicators of Amygdalus communis L. Shache County: (1) The Amygdalus communis L. will suffer mild to moderate frost damage when the average temperature in winter is lowered than normal year, and the day's lowerest temperature is below -18℃and there was a continuous process. (2) The Amygdalus communis L. will surfer moderate frost damage when the average temperature is lowered than normal or more year and there was cool weather, also the extreme minimum temperature reached-21℃and the lowerest temperature≦-21℃.(3) In winter the average temperature lower than normal year, and significant precipitation associated with the process of cooling, when the extreme minimum temperature≦-23℃continue the Amygdalus communis L.. will suffer serious frost damage.2. Temperature and relative electrical conductivity has a linear relationship. The relative electrica conductivity is increasedwhen the temperature decreased and low temperature increase and when the the degree of injury will increased. Logistic equation was used: a 24 test sample of the lethal temperature between -32.702℃~ -23.105℃, the Yingjisha 2'sforce to fight against cold is the strongest. Test the branches of Amygdalus communis L. skin F0, Fv/F by Chlrophyll Fluorescenc. It's indicate that about -24℃~ -27℃low temperature will cause serious damage to the structure of PSⅡ. 3. The freezing temperatures -20℃<t≦-18℃in Shache County's sanuary is to 24%.The frequency of low temperatures to≦-23℃is only 6%. Fuzzy analysis showed that the minimum temperature in in Shache County≦-18℃for 2~3years,≦-21℃16 ~ 17 years. Therefore, the Shache County's occurrence of frost damage in winter is less frequently. The threat to Amygdalus communis L. is small.