摘要
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 characteristics of potassium content of flue-cured tobacco in Qujing and its relationship with the main ecological factors, 3 506 flue-cured tobacco samples were collected and their potassium content was measured, the potassium content of flue-cured tobacco in Qujing and its main influencing factors were studied by decision tree analysis and regression analysis. The results show that mean potassium content of flue-cured tobacco was 1.65%with a amplitude of 0.35 to 3.60%, and potassium content were lower than 2% in 81.86% of tobacco samples’, but there were significant differences between counties. Furthermore, altitude, soil type, soil texture, soil organic matter, soil available potassium, soil available magnesium, and soil available calcium have great influence on the potassium content of flue-cured tobacco. The inflection point of altitude impact on tobacco potassium content were 1 689, 1 814 and 2 023 m, with the increase in altitude, the potassium content decreased, with the increase in soil texture viscosity, potassium content of flue-cured tobacco increased. Potassium content of flue-cured tobacco was significantly different between different soil types, as yellow soil is the highest （2.07%）, and purple soil （1.59%） is the lowest. The inflection point effect of soil organic matter on tobacco potassium content were 23.768 and 39.060g·kg^-1, and with the increase of soil organic matter, the potassium content of flue-cured tobacco showed a gradually increasing trend. The inflection point effect of soil available potassium of tobacco potassium content were 153.746, 205.000 and 328.169 mg·kg^-1, and with the increase of soil available potassium, the potassium content of flue-cured tobacco showed an increasing trend. With the increase of soil available calcium, potassium content of flue-cured tobacco decreased. With the increase of soil available magnesium, potassium content of flue-cured tobacco was increased at first and then decreased, while the content of available magnesium in soil was about 300 mg·kg^-1, the potassium content of flue-cured tobacco was up to the peak value, and the potassium content of flue-cured tobacco showed a decreasing trend with the increase of Ca/K an Mg/K of soil.The results provide a practical source in guiding for improving the potassium content of flue-cured tobacco in Qujing tobacco planting areas.
出处
《核农学报》
CAS
CSCD
北大核心
2017年第5期918-926,共9页
Journal of Nuclear Agricultural Sciences
基金
云南省烟草公司项目(2014YN24)
红云红河烟草集团项目(HYHH2012YL03
HYHH2016YL03)
关键词
烤烟
钾含量
生态因子
曲靖
flue-cured tobacco,potassium content, ecological factor, Qujing
