湖南烟区烤烟磷含量与土壤磷素的分布特点及关系分析

Distribution and relationship of phosphorus content in flue-cured tobacco leaf and phosphorus content in soil in Hunan tobacco-growing areas.

测定湖南烟区308份烤烟样品磷含量和1342份土壤样品磷含量，分析两者的分布特点及相互关系．结果表明：①湖南烟区烤烟磷含量适中，平均为（0．24±0．07）％，变幅为0．11％～0．53％，有93．83％的烟样磷含量落在0．15％～0．60％之间，与巴西优质烤烟磷含量（0．20％～0．28％）的符合程度为41．88％；不同等级烟叶磷含量的变化规律是B2F〉C3F〉X2F．②湖南烟区土壤全磷含量偏低，平均为（0．78±0．31）g．kg^-1，变幅为0．18～3．83g．kg^-1，有78．32％的土样全磷含量低于1．00g．kg^-1；土壤速效磷含量适中，平均为（19．67±13．63）mg．kg^-1，变幅为1．00～92．10mg．kg^-1，有29．66％的土壤速效磷含量低于10．00mg．kg^-1；不同土壤类型的速效磷含量变化规律是鸭屎泥〉黄泥田〉青泥田〉沙泥田〉红黄泥〉黄壤土〉黄灰土．③烤烟磷含量与土壤速效磷含量呈极显著正相关，与土壤有机质、全氮、碱解氮、有效铜、有效铁、有效硫和水溶性氯含量亦呈极显著正相关，与土壤全钾、有效锰、有效钼和交换性镁含量则呈显著负相关；在相关性分析基础上，建立了土壤养分与烤烟磷含量的逐步回归方程．④当土壤速效磷含量较低时，烤烟磷含量随着土壤速效磷含量的增加而增加．

The phosphorus contents for 308 flue-cured tobacco leaf samples and 1342 soil samples were determined in Hunan tobacco-growing areas, and their distribution and relationship were analyzed. The results indicated that： （i） The phosphorus content in flue-cured tobacco leaf was suitable in total in Hunan tobaccogrowing areas, which ranged from 0. 11% to 0. 53% with the mean of （0. 24 ±0. 07）%; The phosphorus content in 93. 83% tobacco samples was located in the range of 0. 15% to 0. 60%, and the phosphorus content in 41.88% tobacco samples met with the standard （0.20%to 0.28%） of Brazil; the order of the phosphorus content in flue-cured tobacco leaf among different grades was B2F〉C3 F〉X2 F. （ii） Total phosphorus content in soil was low in Hunan tobacco-growing areas, which ranged from 0. 18 g. kg^-1 to 3. 83 g. kg^-1 , with the mean of （0. 78±0. 31） g. kg^-1 . Total phosphorus content for 78. 320/00 soil samples was less than 1.00 g. kg^-1. Available phosphorus content in soil was medium, which ranged from 1.00 mg. kg^-1 to 92. 10 mg. kg^-1 with the mean of （19.67± 13.63） mg. kg^-1 . 29.66% soil samples were short of available phosphorus （4 10. 00 mg. kg^-1 ）. The order of available phosphorus content in soil for different soil types was duck feces mud yellow mud field 〉 blue mud field 〉 sand mud field 〉 red yellow mud 〉 yellow soil 〉 yellow ash soil. （iii） The phosphorus content in flue-cured tobacco leaf had high positive correlation at the 0.01 level with available phosphorus content in soil, and also had high positive correlation at the 0.01 level with soil organic matter, total N, hydrolytic N, available Cu, available Fe, available S and water soluble C1 in soil, but had negative correlation at the 0.05 level with total K, available Mn, available Mo and exchange Mg in soil. Based on the correlation analysis, multiple stepwise regression equations were built between soil nutrients and the phosphorus content in flue-cured tobacco leaf. （iv） When the available phosphorus content in soil was low, the phosphorus content in flue-cured tobacco leaf increased with the increase of soil available phosphorus content.