美国引进烤烟品种对海拔高度的敏感性研究

为研究烤烟品种的生育期及综合性状对海拔的敏感性，通过大田试验对种植在海拔1690 m、1960 m两个试验点的8个从美国引进的烤烟品种进行了对比试验。结果表明:（1）各品种种植在低海拔区时苗期和大田生育期均比高海拔区短，现蕾期推迟，对中心花开放期的影响因品种而异；（2）种植在低海拔区时株高和叶数均比高海拔区有所增加；（3）种植在低海拔区时烟叶产量和产值均比高海拔区高，但对上中等烟比例的影响不明显；（4）种植在低海拔区时烟叶烟碱、总氮和蛋白质含量均比高海拔区低，总糖含量、糖碱比和施木克值则比高海拔区高；（5）品种对海拔的敏感性不完全相同。 

Study of altitude sensitivity in US flue-cured tobacco variety

In order to investigate sensitivity of flue-cured tobacco variety to altitude, eight varieties introduced from USA were planted at altitude 1690m and 1960m, respectively. Results showed that seedling stage, growth and development period were shortened at lower altitude, while the time of showing flower buds was delayed. Flowering date of centre flower varied among cultivars. Leaf numbers and plant height increased as well as tobacco yield and production value at lower altitude. Proportion of superior and middle grade tobacco leaves were less affected. Ncotine content, total nitrogen, and protein was reduced at lower altitude, but the ratio of total sugar to nicotine, total sugar to protein and total sugar increased. Results also indicated that there existed different regulation among cultivars, as well as the sensitivity in flue cured tobacco.