A Study of freezing injury of Ficus microcorpa in Nanchong——Taking China West Normal University as an Example

This research was to seek in-depth the genetal situation of low-temperature damage of Ficus microcorpa,including freezing tolerance, influencing factors, to explore the relationship between environmental factors,DBH of trees and situation of damage caused by freezing injury in order to improve and adjust the cultivation measures, enhance the greening work of campus and the whole city. Firstly, trees were classified by tree size, field survey of the frost damage was conducted and the crown frost area was observed and recorded, preliminary grading of frost damage of Ficus microcorpa was done, the Ficus microcorpa growth environment was described, including building block, building orientation and atmospheric conditions.Investigation of the freezing plant percentage, calculation of disease index, and its maximum tolerance limit were also done. The relationship between freezing injury and the habitat was also analyzed in statistics by analyzing and comparing the frost damage on leeward side of building and windward side with independent sample t test, then observing the correlativity between freeze injury degree and different tree size. The result showed that the sphere of freezing injury influence was 100%, the disease index for the whole campus was 56.94%, which was a serious damage,with a tolerance limit of grade 5. Through data analysis, it was found that the regional environment had a significant effect on the degree of frost damage, and tree DBH had no significant effect on frost damage. Finally, according to the actual situation, prevention and treatment recommendations were provided.