Comparative Analysis on Cold Resistance of Different Hazelnut Based on DSC Technology

Taken Corylus chinensis, C.heterophylla and C.wangii as research object, cold resistance of hazelnut trees in different areas was comparative analyzed with differential scanning calorimetry (DSC), combined with climatic information at sampling sites. The results indicated that the strongest level of cold resistance was C.heterophylla, followed by C.wangii, the weakest level was C.chinensis. The mean annual maximum and minimum temperature at the sampling sites of C.wangii and C.chinensis was similar. However, judging from the experimental data, the cold resistance of C.wangii was very similar with C.heterophylla. The enthalpy value of C.heterophylla was 2.398 J/g, the peak temperature of endothermic enthalpy was 2.63 ℃.The enthalpy value of C.wangii was 2.558 J/g, the peak temperature of endothermic enthalpy was 2.26 ℃. Especially on the basis of DSC peak graph, the experimental results of sensitivity indexes such as 3D, this study infers that the dimension of C.wangii cold resistance should be similar with C.heterophylla. In conclusion, plants that meet the normal distribution curve have the ability of cold resistance, the heat enthalpy value of plant was smaller, and the ability of cold resistance was stronger. Mesh 3D graphics indicated thatthe higher the proportion of high sensitivity value of the plant, the stronger ability of the cold resistance.