河南主产烟区土壤颗粒分形特征及对烟叶理化性状的影响

为了研究河南烟区土壤粒径与烟叶品质的关系,在主产烟区选取了26个代表性土样和对应的烤后烟样。建立土壤质量分形模型并计算出烟区耕层土壤分形维数D值。采用多重比较、简单相关分析、通径分析方法分析了土壤分形维数与烟叶主要物理性状、化学成分的相关性。结果表明：①河南主产烟区土壤分形维数最高的地区是洛阳,分形维数为2.818;最低的地区是驻马店,分形维数为2.714,呈现空间异质性。土壤分形维数与黏粒呈极显著正相关,与粗粉粒呈极显著负相关,表现为土壤颗粒越小,土质越粘重,土壤分形维数越大。②烟叶物理性状中叶质重权重为0.2463,与分形维数间接正相关;烟叶化学性状中烟碱权重为0.2214,与分形维数间接负相关。推论河南烟区适宜分形维数为2.752左右,可通过栽培方式培育适宜分形维数。

Fractal Characteristics of Soil Particles and Their Effects on Physicochemical Properties of Tobacco Leaves in Main Tobacco Growing Areas in Henan

In order to study the relationship between soil particle size and tobacco leaf quality in Henan tobacco area, 26 representative soil samples and flue-cured tobacco samples were taken from the main tobacco growing areas of Henan. The fractal model of soil quality was established and the soil fractal dimension D value of soil particle mass in plowlayer was calculated. By using multiple comparison, simple correlation analysis and path analysis, the correlation between soil fractal dimension and main physical properties and chemical composition of tobacco leaves were analyzed. The results showed that: ① The highest fractal dimension of soil in the main tobacco producing areas in Henan was Luoyang, which was 2.818, and the lowest was Zhumadian, 2.714, showing spatial heterogeneity. The soil fractal dimension was significantly positively correlated with clay particles, which was significantly negatively correlated with the coarse silt, which showed that the smaller the soil particles, the greater the soil clay, the greater the fractal dimension of soil. ② The weight of leaf weight was 0.2463 in tobacco physical characters, and was positively correlated with fractal dimension. The weight of nicotine in tobacco chemical characters was 0.2214, which was significantly negatively correlated with fractal dimension. ③ It was concluded that the suitable fractal dimension of Henan tobacco area was about 2.752, and the suitable fractal dimension could be cultivated by cultivation method.