基于GIS的甘肃省油橄榄气候适宜性区划

GIS Based Demarcation of Olive Climatic Suitability in Gansu Province

GIS技术为经济林木气候适宜性区划提供了有效的技术手段。为给甘肃省合理布局油橄榄种植区提供参考依据,根据油橄榄生长所需的气候条件,选取≥10℃积温、干燥度、年日照时数这3个气候因子作为甘肃省油橄榄气候适宜性区划指标,按照气候分区分别建立区划指标的空间分析模型,对区划指标进行了100 m×100 m的细网格点推算;并以ArcView为GIS工具,制作完成了细网格的甘肃省油橄榄气候适宜性区划图。区划结果表明:甘肃省陇南市武都区、宕昌县、文县的海拔高度在1 300 m以下的白龙江干热河谷川坝及半山区,其气候条件与油橄榄原产地地中海很相似,是油橄榄种植的最适宜和适宜气候区。

GIS technology provides an effective means to the demarcation of climatic suitability of commercial forest. According to the climatic condition in which olive grows normally, three climatic factors including ≥10℃ accumulated temperature, aridity index and sunshine duration were selected as the demarcation indices of climatic suitability. Based on the climatological division, the spatial analyzing models of the demarcation indices were built respectively, and the demarcation indices on fine-grid of 100 m（100 m were calculated. The fine-grid demarcation of climatic suitability of olive planting in Gansu province was carried out by using A rcView 9.2. The results showed that the most suitable and suitable regions were concentrated in the dry-hot valleys and the low mountains below an altitude of 1 300 metres of Bailong river in Wudu county, Tanchang county and Wen county of Longnan, Gansu where the climatic condition is very similar to the Mediterranean climate that is the climate of the olive origin. This study provided scientific basis for spatial allocation of olive in Gansu province.