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    南平烟区植烟土壤主要养分丰缺特征及其时空变异

    Analysis of the Main Nutrients Abundancy and Deficiency Characteristics and Their Spatio-Temporal Variability in Tobacco-Growing Soil in Nanping

    • 摘要: 为明确南平烟区土壤主要养分的丰缺状况、空间分布及时间变化,于2018年底采集各植烟县(市/区)代表性土样170个,测定了土壤容重、pH、有机质、总氮、有效磷和速效钾等土壤理化指标,并与2008年及2014年数据结果相比较,明确了南平植烟土壤养分的时空演变特征。结果表明,南平烟区土壤容重介于0.76~1.61 g/cm3,均值1.14 g/cm3,建瓯土壤容重最大,为1.43 g/cm3。土壤pH介于4.80~6.66,46.67%的土壤pH在适宜范围之内;有机质和总氮含量总体呈中等及较丰富程度;有效磷和速效钾含量较丰富。近十年来南平烟区土壤pH和速效钾呈上升趋势,总氮呈下降趋势,有效磷较2014年结果呈下降趋势,显示南平烟区土壤酸化改良及减肥(氮)增效效果显著;土壤有机质含量较2014年结果呈下降趋势。南平烟区10个主产烟县(市/区)土壤养分特征差异较大,宜通过必要的生产管理措施进行调节。

       

      Abstract: In order to clarify the main soil nutrient abundance, spatial distribution and temporal changes in the tobacco-growing areas of Nanping, 170 soil samples were collected from the tobacco-growing areas, and the physical and chemical properties (i.e., soil bulk density, pH, organic matter, total nitrogen, available phosphorus and available potassium) of tobacco planting soil were determined in 2018. The temporal variation characteristics of tobacco planting soil nutrients were studied by comparing with the results of soil nutrients in tobacco areas in 2008 and 2014. The results showed that the soil bulk density in Nanping tobacco areas was 0.76-1.61 g/cm3, with an average value of 1.14 g/cm3, and the soil bulk density in Jian'ou was the largest at 1.43 g/cm3. The soil pH was between 4.80 and 6.66, and 46.67% of the soil pH was within the appropriate range. The soil organic matter and total nitrogen content were mainly in the level of medium and rich. The contents of available phosphorus and available potassium were relatively rich. Soil pH and available potassium in tobacco growing areas showed an upward trend, while total nitrogen showed a downward trend in the past ten years, and available phosphorus showed a downward trend compared with that in 2014, which indicated that soil acidification improvement and weight loss and synergistic effects were obvious in the past ten years. The soil organic matter content also showed a downward trend compared with the results in 2014, which may be related to the increase in the continuous tobacco planting years and the decrease of organic materials input in recent years. The soil nutrient characteristics of the 10 main tobacco producing counties (cities) in the Nanping tobacco planting area varied widely and should be regulated through appropriate management measures.

       

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