四川省四大植烟区土壤肥力评价

Evaluation on Soil Fertility in Four Tobacco-growing Areas of Sichuan Province

对四川省4个植烟区(攀枝花、广元、宜宾、泸州)的土壤样本进行养分测定,选取了阳离子交换量(CEC)、有机质、p H、速效钾、碱解氮、全氮、全磷和全钾8项评价指标。运用主成分分析法确定各评价因子权重,隶属度函数模型确定各评价因子隶属度值,进而根据加乘法原理计算出土壤肥力综合指数(IFI),最后根据各样地IFI得分对土壤肥力进行分级。结果表明,攀枝花和广元植烟区土壤有机质、速效钾、碱解氮含量都偏低,泸州植烟区除碱解氮外其他营养成分含量都适中,适宜烟草生长,土壤肥力较高。四川省4个植烟区土壤肥力可分为Ⅰ级(较高),Ⅱ级(中等),Ⅲ级(较低),Ⅳ级(低)四个等级。4个植烟区土壤肥力质量排名为泸州>广元>宜宾>攀枝花。

In order to understand the soil fertility in the four tobacco-growing areas, several soil samples were selected as the tested materials to analyzed their nutrient index, including cation exchange capacity（CEC）, organic matter, p H, available potassium, available nitrogen, total nitrogen, total phosphorus and total potassium eight evaluation indicators. The method of principal component analysis and the model of membership function were applied to determine the weighted value and the membership degree of each soil nutrient index, according to the principal of multiplication to calculate integrated fertility index（IFI）. The results showed that the contents of organic matter, available potassium and available nitrogen were high both in Panzhihua and Guangyuan tobacco-growing areas. In Luzhou tobacco-growing area, all of the nutrition contents were moderate except available nitrogen. The area was suitable for tobacco growth, and the soil fertility was high. The soil fertility could be classified into four groups of higher, medium, low, lower on the IFI. The soil fertility rank was Luzhou GuangyuanYibinPanzhihua.