Abstract:

To reduce the economic losses and improve the ability of tea production to resist meteorological disasters, the risk analysis of frost damage during the spring tea growing season was carried out based on the daily minimum temperature data of 84 meteorological stations in Guizhou province from 1961 to 2020, and the frost damage risk index was constructed using the methods of mathematical statistics and spatial analysis.The results show that light frost damage is the main disaster of spring tea in Guizhou province.The number of days frost occurred and the station ratio of frost for each grade shows a decreasing trend.The frost damage risk level is high in the west and the north, becomes lower in the east and the south.The areas with sub-high risk are mainly distributed in the north of Liupanshui, the most of the west and the middle of Bijie, the part of the northern Guiyang, the part of the Daloushan in the north of Zunyi, Fanjing Mountain Area in the middle of Tongren, Leigong Mountain Area in the southeast of Guizhou province and Doupeng Mountain Area in Southern Guizhou province.The total area is about 3.7×10⁴ km², accounting for 21.7% of the entire area of Guizhou province.The lowest risk areas are mainly distributed in the Beipanjiang River Basin in the southwest Chishui River Basin in the north and Duliu River Basin in the southeast and the area is about 2.34×10⁴ km², accounting for 14.3% of the total area of Guizhou province.

Key words: Spring tea, Frost, Damage risk index, Risk zoning