Adopting principal component analysis,the predominant climatic factors affecting the growth and development of walnut in Sichuan province were annual average temperature,≥10℃ accumulated temperature,annual extreme low temperature,annual sunshine duration,annual rainfall,average temperature in January and in July.Through comprehensive analysis on climatic and soil factors,combining the climatic conditions of Sichuan province and the biological characteristics of walnut,the suitable ecological indexes for walnut planting in Sichuan province were narized as; alleviation of 400 ~2 800 m,soil pH of 5.5 ~8.5,soil thickness of ≥60 cm,≥10℃ accu-muli mperature of 3 000 ~6 500℃,annual temperature of 9~18℃,annual extreme temperature of≥ - 15℃; an fall of 400 ~ 1 200 mm,annual sunshine duration of ≥1 300 h,average January temperature of ≥ -1℃,rnage temperature of ≤28℃.Accordingly,the planting areas for walnut in Sirhuan province were divided four regims,namely the central cultivation areas at north and northeast edge of Sichuan basin,central cultiva-areas located at mountainous gorge in west Sichuan,central cultivation areas located at southwest Sichuan,cultivation areas at central part of Sichuan basin.The ecological adaptabilities of different regions for walnut cultivation were evaluated,which could provided the scientific basis for walnut industry development in Sichuan province.%采用主成分分析法,确定了影响四川核桃生长发育的主导气候因子为,年均温、≥10℃积温、年极端低温、年日照时数、年降水量、1月平均气温和7月平均气温.通过对气候因子和土壤因子的适宜性综合分析,结合四川核桃主产区气候条件和生物学特性,得出全省核桃主要适宜的生态指标为,海拔400～2 800 m、土壤pH值5.5～8.5、土层厚度≥60 cm、≥10℃积温3 000 ～6 500℃,年平均气温9～18℃、年极端低温≥- 15℃、年降水量400～1 200 mm、年日照时数≥1 300h、1月平均气温≥-1℃、7月平均气温≤28℃.由此将四川划分为四川盆地北缘、东北缘核桃中心栽培区,川西高山峡谷核桃中心栽培区,川西南山地泡核桃中心栽培区,四川盆地中部核桃、泡核桃一般栽培区4个栽培区,对各区域核桃适宜性进行了评价,为四川核桃产业发展提供了科学依据.
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