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为了研究曲靖烤烟钾含量特征及其与主要生态因子的关系,在曲靖烟区采集烤烟样品3 506个,测定其钾含量,并采用决策树分析、回归分析等方法探究曲靖烤烟钾含量特征及其主要影响因素。结果表明,曲靖烟区烤烟钾含量平均为1.65%,且变幅较大(0.35%~3.60%),有81.86%的烟叶钾含量<2.0%,钾含量在县域间差异达极显著水平;此外,海拔高度、土壤质地、土壤类型、土壤有机质、土壤速效钾、土壤有效钙、土壤有效镁均影响烤烟钾含量。海拔高度对烤烟钾含量影响的拐点分别为1 689、1 814和2 023m,且随海拔上升,烤烟钾含量下降;土壤质地粘性增加,烤烟钾含量随之增加;烤烟钾含量在不同土壤类型间差异达极显著水平,其中黄壤中的含量最高(2.07%),紫色土最低(1.59%);土壤有机质对烤烟钾含量影响的拐点分别为23.768和39.060 g·kg~(-1),且随土壤有机质增加,烤烟钾含量表现为逐渐增加趋势;土壤速效钾对烤烟钾含量影响的拐点分别为153.746、205.000和328.169 mg·kg~(-1),随土壤速效钾增加,烤烟钾含量表现为逐渐增加趋势;随土壤有效钙增加,烤烟钾含量呈下降趋势;随土壤有效镁增加,烤烟钾含量呈先上升高后下降的趋势,有效镁含量为300 mg·kg~(-1)左右时,烤烟钾含量达峰值;随着土壤钙钾比和镁钾比升高,烤烟钾含量呈减速下降的趋势。本研究结果对提高曲靖烟区烤烟钾含量具有一定指导意义。
In order to study the relationship between K content and its main ecological factors in Qujing tobacco flue-cured tobacco, 3 506 flue-cured tobacco samples were collected in Qujing tobacco-growing areas to determine their K content. The characteristics of K content in Qujing flue-cured tobacco and its relationship were analyzed by decision tree analysis and regression analysis the main factor of influence. The results showed that the average potassium content of flue-cured tobacco in Qujing tobacco area was 1.65%, and the variation range was large (0.35% -3.60%). The content of potassium in tobacco leaves was less than 2.0% with 81.86%, and the difference was significant at the county level. , Altitude, soil texture, soil type, soil organic matter, soil available potassium, soil available calcium and soil available magnesium all affected the potassium content in flue-cured tobacco. The inflection points of altitude on the content of potassium in flue-cured tobacco were 1 689,1 814 and 2 023m, respectively. With the elevation increasing, the content of potassium in flue-cured tobacco decreased. The viscosity of soil texture increased and the content of potassium in flue-cured tobacco increased. (2.07%) in purple soil and the lowest purple soil (1.59%). The inflection points of soil organic matter on potassium content in flue-cured tobacco were 23.768 and 39.060 g · kg -1, respectively, The content of soil organic matter increased while the content of potassium in flue-cured tobacco showed a gradually increasing trend. The inflection points of soil available potassium on the content of potassium in flue-cured tobacco were 153.746, 205.000 and 328.169 mg · kg -1, respectively. With the increase of soil available potassium, The content of potassium in flue-cured tobacco decreased with the increase of soil available calcium. With the increase of soil available magnesium, the potassium content of flue-cured tobacco increased first and then decreased, and when the content of available magnesium was about 300 mg · kg -1 , And the content of potassium in flue-cured tobacco reached the peak value. With the increase of Ca-K ratio and Mg-K ratio, the potassium content of Flue-cured tobacco showed a decreasing trend. The results of this study have some guiding significance to improve the potassium content of flue-cured tobacco in Qujing.