基于DEM的荔枝冻害精细化区划——以福建省漳州市为例

A Refined Spatial Division of Freezing Injury to Litchi Base on Digital Elevation Model:A Case from Zhangzhou

应用逐步回归分析方法和GIS技术,构建福建省越冬期极端最低气温(Td)和4个等级冻害指标(-2℃<Td≤0℃、-3℃<Td≤-2℃、-4℃<Td≤-3℃、Td<-4℃)发生频次空间分析模型,根据荔枝冻害评价指标,对漳州市荔枝种植区进行区划。结果表明:1)漳州市荔枝种植区可分为微冻害区、轻度冻害区、中度冻害区、重度冻害区,其中最微冻害区、轻度冻害区、划区结果与实际荔枝种植分布较吻合;2)漳州市荔枝种植微冻害区、轻度冻害区主要分布在漳州市东南部及西北部低山丘陵,中度冻害区、重度冻害区主要分布在适宜区以西海拔较高区域。

The spatial models about winter extreme low temperature and 4 levels＇（-2 Td≤0℃,-3 Td≤-2℃,-4 Td≤-3℃,Td -4℃） cold damage model were built,by using stepwise regression analysis and GIS technology,then the planting areas of Litchi in Zhangzhou were divided according to the grading index.The result showed that：1） the planting areas of Litchi in Zhangzhou were divided into slight freezing injury areas,mild freezing injury areas,moderate freezing injury areas,and severe freezing injury areas.Slight and mild freezing injury areas are consistent to real planting areas of Litchi;2） slight and mild freezing injury areas are located in the southeast and northwest of Zhangzhou with low mountain and hills,moderate and severe freezing injury areas are located in the west parts with higher mountains.