恩施烟区土壤磷素与烤烟磷含量的关系

Relationship between the Phosphorus Contents in Soil and in Flue-cured Tobacco in Enshi Tobacco-growing Areas

分析了湖北省恩施烟区土壤磷素与烤烟磷含量的状况及其相互关系,结果表明:恩施烟区土壤磷素含量偏低,全磷和速效磷含量分别为(0.63±0.23)gkg-1和(16.88±12.73)mgkg-1,二者之间存在极显著的正相关,相关系数为0.6353**。土壤全磷和速效磷含量在不同海拔高度、土层深度之间差异显著,海拔之间表现为:高海拔>中海拔>低海拔;土层之间表现为:0～20cm>20～40cm>40～60cm。烤烟磷素含量较低,平均为(1.68±0.32)gkg-1,在不同品种、海拔之间差异显著,品种之间表现为:云烟87>K326>云烟85,海拔之间表现为:高海拔>中海拔>低海拔。烤烟磷素含量在等级之间差异不显著,但随着叶位的升高,烤烟磷含量有升高的趋势。烤烟磷含量(y)与土壤速效磷含量(x)之间存在极显著的回归关系,y=0.1224+0.0026x,相关系数r=0.8582**。土壤速效磷含量分组后,随着土壤速效磷含量升高,烤烟磷含量也呈现出升高趋势。

Distributions of the phosphorus content in soil and flue-cured tobacco and their relationships were analyzed in Enshi tobacco-growing areas of Hubei Province.The results indicated that the phosphorus content in soil in Enshi tobacco-growing areas was low,and the total and available phosphorus contents were respectively 0.63±0.23 g kg-1 and 16.88±12.73 mg kg-1.There existed high significant positive correlation between the total phosphorus content and the available phosphorus content,and correlation coefficient was 0.6353.Significant differences were found between different altitudes or soil depths.As for the total and the available phosphorus contents,the order was high altitude middle altitude lower altitude;while for different soil depths,0-20 cm 20-40 cm 40-60 cm.The phosphorus content of flue-cured tobacco was low with the mean of 1.68±0.32 g kg-1.Significant differences were also found between different cultivars or altitudes.As for the phosphorus content of different cultivars of flue-cured tobacco,the order was Yunyan 87 K326 Yunyan85;while for different altitude,high altitude middle altitude lower altitude.Though differences of the phosphorus content among different grades were not significant,the phosphorus content increased as the stalk positions were higher.Linear regression equation of y=0.1224＋0.0026x was established between the phosphorus content of flue-cured tobacco（y） and the available phosphorus content（x） in soil,with high significant correlation coefficient of 0.8582.After the available phosphorus content in soil was grouped,the phosphorus content of flue-cured tobacco increased with the increment of soil available phosphorus content.