Abstract:

To establish a daily scale suitability model of temperature, precipitation, sunshine and comprehensive elements in Guangxi, and apply it to the classification of Citrus climate suitability grade and the analysis of the temporal and spatial distribution characteristics of climate suitability over the years. Based on the daily meteorological data of 87 national automatic weather stations in Guangxi from 1961 to 2018 and the climate habit of Citrus growth, the fuzzy mathematical method was used to establish the model, and the model was verified by using the abnormal weather in typical years and stages. The results show that: the regression fitting effect of daily meteorological elements of the model is good, and the determination coefficient is above 0.89; the classification method of suitability index of each element is reasonable, and most areas of Guangxi are suitable for Citrus planting, which is in line with the actual situation. The scale of the model is fine, and the quantitative evaluation has good effect; it could better describe the abnormal weather changes of Citrus climate suitability with seasons and stages, such as extreme high temperature, low temperature, drought, rainstorm, etc.; the spatial distribution characteristics of meteorological elements’ suitability of Citrus in Guangxi are obviously affected by regional climate, the heat condition is sufficient or even too much, while precipitation and sunshine are insufficient in some areas. Therefore, more consideration should be given to precipitation and sunshine in choosing Citrus planting areas in Guangxi.

Key words: climate suitability, model, Citrus, Guangxi, distribution characteristics