湖北恩施不同海拔烟区气候因素综合评价

Comprehensive evaluation of climate factors for Enshi tobacco-growing areas at different altitudes of Hubei province

对恩施不同海拔烟区气候适生性进行了综合评价,并与国外优质烟区气候进行相似性比较与分析,结果表明:1)随着海拔的升高,烟叶各生育期的平均气温和≥10℃积温呈降低趋势,烟叶大田期日照时数和各生育期的降雨量则呈上升趋势;恩施各生育期均温、各生育期降雨量、大田期日照时数、≥10℃的积温和无霜期在不同海拔间均存在显著差异.2)随着海拔的升高,恩施气候适生性指数值(CFI)呈降低趋势,以低海拔地区的CFI值(0.903)最大,高海拔地区的CFI值(0.660)最小,不同海拔气候适生性差异显著.3)恩施烟区气候与津巴布韦烟区的气候相似距离平均值最小,低、中、高海拔地区气候相似距离分别为0.383,0.402和0.431,恩施低海拔烟区气候与国外优质烟区气候的相似程度最高,高海拔烟区相似程度最低.

Climate status of Enshi tobacco-growing areas at different altitudes of Hubei province was analyzed, and climate feasibility was comprehensively evaluated at different altitudes of Enshi tobacco-growing areas, and similarity analysis of climate conditions between Enshi tobacco-growing areas and highquality tobacco-growing areas overseas was also conducted. The results indicated that： 1 ）Average temperature of every growth period and accumulated temperature of ≥ 10 ℃ decreased with the increasing of altitude, sunlight during field period and precipitation of every growth period increased with the increasing of altitude. Average temperature, precipitation, sunlight, accumulated temperature of ≥ 10 ℃ and frost-free period had significant difference among different altitudes of Enshi tobacco-growing areas. 2）Climate feasibility indexes（CFI） decreased with the increasing of altitude, CFI was the largest（0.903 ） at high altitude areas, and CFI was the smallest（0.660） at low altitude areas, climate feasibility indexes had significant difference among different altitudes of Enshi tobacco-growing areas. 3 ）The average similarity distance of the climate conditions at different altitudes was smallest between Enshi and Zimbabwe tobaccogrowing areas,for 0. 383,0. 402, 0. 431, respectively. Similarity degree of the climate conditions was highest between low altitude areas of Enshi and high-quality tobacco-growing areas overseas, and lowest between high altitude areas of Enshi and high-quality tobacco-growing areas overseas.