重庆市主要烟区土壤肥力状况综合评价

利用模糊数学和偏相关分析计算出重庆烤烟种植区土壤肥力综合指数IFI值,对各植烟区肥力状况进行分析与综合评价.结果表明:重庆市植烟土壤肥力因子多处于中等至强变异强度,对土壤综合肥力指数贡献最大的为有机质,其次是碱解氮、 pH值、有效硼、速效磷,贡献最低的是有效锌,其中,速效磷、速效钾和有效锌变异强度较大,土壤各因子与15年前相比,土壤pH值、土壤水溶性氯、土壤有效硼、有效锌和有效镁下降,其余指标则有不同程度上升.重庆市植烟区县整体土壤肥力综合指标值较高,但不同营养元素质量分数丰缺状况不同,不同区县的养分质量分数差异较大,重庆烟田需加强测土配方施肥,采用综合养分管理技术,提升烟田地力水平,促进烟草产业可持续健康发展.

Comprehensive Evaluation of Soil Fertility in Flue-Cured Tobacco-Growing Areas of Chongqing

The principle of fuzzy mathematics and the method of partial correlation analysis were used to calculate the IFI (integrated fertility index) of the flue-cured tobacco growing areas in Chongqing, with which the situation of soil fertility in these areas was comprehensively analyzed and evaluated. The results were as follows. The soil fertility factors of tobacco-growing areas in Chongqing are mostly of medium or strong variation intensity, and the variation intensity of available phosphorus, available potassium and available zinc is relatively great. The most important contribution to the soil fertility index is made by organic matter, followed in order by alkali hydrolyzed nitrogen, pH, available boron and available phosphorus. Available zinc makes the least contribution. Compared with the situation of 15 years ago, soil pH, water soluble Cl, available B, available Zn and available Mg have decreased, while the other factors have risen in different extents. In a word, the overall soil fertility index of Chongqing tobacco planting areas is relatively high, but the the nutrient mass fraction varied greatly in different districts and counties. Therefore, it is necessary to strengthen the soil testing formula fertilization and adopt comprehensive nutrient management technology so as to improve the level of soil fertility and promote the sustainable and healthy development of the tobacco industry in Chongqing.