皖北亳州烟区土壤肥力定量评价

Evaluation of Soil Fertility of Tobacco Fields in Bozhou of North Anhui Province

采集分析了谯城区1134个植烟土样的p H值、有机质、碱解氮、速效钾和速效磷的含量,利用模糊数学和主成分分析方法对其肥力进行了定量评价,旨在通过简便科学的评价,快速摸清烟区土壤肥力现状,指导精准施肥。研究结果表明:(1)研究区土壤p H较高,有机质偏低,大部分土壤碱解氮、速效钾、速效磷适中;(2)肥力较低区、中等肥力区和较高肥力区分别占耕地总面积的5.65%、89.93%和4.42%;(3)土壤肥力在南北方向上呈现低-高-低的趋势,东西方向上呈现出高-低-高趋势;(4)现主要植烟乡镇中,从土壤适宜性方面来看,西南部和中部相对优于西北部,西北烟区应该设法提高速效钾含量。

In order to improve the quality of tobacco leaf production and investigate the characteristics of flue-cured tobacco, this study systematically evaluated tobacco soil nutrient in Qiaocheng areas of Bozhou, Anhui Province.Statistical results showed that p H value was high and soil organic matter content was lower than the optimal value.However, the contents of available N, available K and available P in this area were suitable. The fuzzy math and principal component analysis were utilized so as to generate the Integrated Fertility Index（IFI for short）. Furthermore,the IFI values at non-sample location were interpolated by the ordinary kriging method, and the IFI map was reclassified by the evaluation interval. At last, the percentage of each ranked area in the IFI map was calculated.Primary results showed that the percentages of low, middle and high IFI area were 5.65%, 89.93% and 4.42%,respectively. The IFI values revealed a trend of low-high-low and high-low-high, respectively, in the north-south and east-west direction.