基于GIS的陕南柑桔气候生态适宜性区划

陕南秦巴山区地处北亚热带气候区,是柑桔种植北缘地带。为了科学、合理地利用当地农业气候资源,进一步优化产业结构,达到趋利避害、防灾减灾的目的,本文根据陕南秦巴山区近30a的气候资料,采用极端最低气温多年平均值、1月平均气温、年平均气温及年降水量4个因子作为陕南柑桔气候适宜性区划指标;利用GIS空间分析及制图功能,在实现区划指标空间化基础上,采用模糊综合评判方法,对陕南秦巴山区柑桔气候适宜性进行区划,并对各适宜区柑桔生长气候条件优劣进行评述。结果表明,陕南柑桔气候适宜区主要分布于秦巴山区海拔700m以下的浅山丘陵区,在适宜区内,应根据地形特征,选择冷空气不易堆积的＂难进易出型＂丘陵坡地栽培,以减少冻害。

Ecological Climate Suitability Division for Citrus in Southern Shaanxi Based on GIS

Qinling-Bashan mountainous area situated in the north subtropical climate zone,which was the north edge of citrus planting.In order to utilize local agricultural climatic resources,optimize agriculture industry structure and reduce the loss caused by natural disasters,the climate suitability for citriculture in Qinling-Bashan Mountain areas was divided by using GIS spatial analyst and cartography and fuzzy comprehensive evaluation,based on meteorological data in last 30 years in this region.The division indices included average extremely minimum temperature,average temperature of January,annual average temperature and annual average precipitation.The results showed that the suitable area was located in the hilly mountain area below 700m elevation.Though topography characteristic also should be considered,those areas cold air flew easy were good for citriculture preventing freezing harm.