摘要
采用野外调查和室内分析相结合的方法，以恩施烟区有代表性的宣恩和咸丰县为试验地点，研究了土壤镁素和烤烟镁含量的分布特点及相互关系，结果表明恩施土壤镁含量偏低，海拔、土层之间的镁含量差异显着。烤烟镁含量为0．28±0．14％，明显低于巴西烤烟镁含量（0．45％）．烤烟镁含量（y）与土壤镁含量（x）的关系密切，二者之间存在y=0．0158x^0.7637的极显着的回归方程。土壤交换性镁含量分组後，随着土壤交换性镁含量的升高，烤烟镁含量也相应升高。说明采用土壤增施镁素可以提高烤烟镁含量。
Based on representative locations of Xuan＇en and Xianfeng in Enshi tobacco-growing areas, field survey and laboratory analysis were conducted to study the distribution and relationship of magnesium content in soil and magnesium content of flue-cured tobacco. The results indicated that： the magnesium content in soil in Enshi tobacco-growing areas is low, with large coefficient variation, and significant differences are found among the different altitudes and soil depths for the magnesium content in soil. The magnesium content of flue-cured tobacco was far below Brazil＇s （0.45%）, with the mean of 0.28 ± 0.14%. There was closely relationship between magnesium content in soil （x） and the magnesium content of flue-cured tobacco （y）, and positive regression equation of y =0.0158X^0.7637 was established between them. When the exchangeable magnesium content in soil was grouped and with its content increasing, the magnesium content of flue-cured tobacco also increased. These indicated applying magnesium fertilizer could improve the magnesium content of flue-cured tobacco.
基金
本文受湖北省科技攻关项目（项目编号：2006AA201C73）、国家烟草专卖局科技攻关项目（项目编号：110200401017）资助：
关键词
恩施烟区
土壤镁素
烤烟镁
海拔高度
关系分析
Enshi tobacco-growing areas
the magnesium content in soil
the magnesium content of flue-cured tobacco
altitude height
relationship analysis
