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      衡阳典型烟田耕层及剖面养分特征与肥力评价

      Nutrient Characteristics and Fertility Evaluation of Plow Layer and Soil Profile in Hengyang Typical Tobacco Field

      • 摘要: 为明确我国浓香型烟叶主要种植区湖南省衡阳市典型烟田土壤养分特征及肥力丰缺状况,本研究选取9个代表性植烟乡镇进行烟田耕层及剖面(0~100 cm)土壤观测与取样,阐明了典型烟田8项土壤肥力指标(pH、有机质、全氮、碱解氮、有效磷、速效钾、交换性钙、交换性镁)的剖面养分特征及肥力适宜性状况。结果表明,衡阳典型烟田耕层土壤总体酸碱性适宜,有机质含量偏高,全氮和碱解氮含量较适宜,有效磷严重匮乏,速效钾丰缺差距明显,交换性钙含量处于适宜或较高等级,交换性镁含量则处于适宜或偏低等级。整体而言,各指标含量在耕层(0~20 cm)最高。随剖面深度增加,pH和速效钾变化无明显规律;有机质、全氮和碱解氮含量表现为下降-上升-下降趋势,上升拐点普遍出现在60~80 cm深度;有效磷含量整体呈缓慢降低趋势(茶市镇、冠市镇和板桥镇除外);部分烟田20~60 cm交换性钙含量呈先上升后下降趋势,茶市镇则表现为下降-上升-下降趋势,其余烟田变化不大,交换性镁含量整体缓慢下降。茶市镇烟田速效磷、速效钾和交换性钙与其他烟田剖面相比变化差异较大。衡阳各植烟乡镇土壤肥力适宜性评价结果显示,有效磷、碱解氮和速效钾等指标对衡阳典型烟田土壤肥力适应性指数(SFI)有显著制约作用,各典型烟田肥力整体达到中等及较高等级,仅洪市镇肥力较低,后续要针对性开展土壤养分保育与施肥优化措施以提升土壤中磷、钾及镁元素含量及有效性,以确保衡阳烟田养分与烟叶营养均衡。

         

        Abstract: In order to clarify the soil nutrient characteristics and fertility abundance and deficiency of typical tobacco fields in Hengyang City, Hunan Province, the main planting area of strong flavor type tobacco leaves in China, this study selected 9 representative tobacco-growing towns to observe and sample the topsoil and profile (0~100 cm) soil of tobacco fields, and clarified the profile nutrient characteristics and fertility suitability of 8 soil fertility indicators (pH, organic matter, total nitrogen, alkali-hydrolyzed nitrogen, available phosphorus, available potassium, exchangeable calcium, exchangeable magnesium) in typical tobacco fields. The results showed that the topsoil of typical tobacco fields in Hengyang was generally suitable for acidity and alkalinity, the content of organic matter content was high, while the levels of total and alkali-hydrolyzable nitrogen were suitable. However, the available phosphorus was severely deficient, and the gap between the abundance and deficiency of available potassium was obvious. The content of exchangeable calcium was suitable or higher, whereas that of exchangeable magnesium was suitable or lower. On the whole, the content of each index was the highest in the plough layer (0~20 cm). With the increase of profile depth, pH and available potassium had no obvious regularity. The contents of organic matter, total nitrogen and alkali-hydrolyzed nitrogen showed a trend of ‘down-up-down’, and the rising inflection point generally appeared in the depth of 60-80 cm. The content of available phosphorus decreased slowly (except for Chashi Town, Guanshi Town and Banqiao Town). The content of exchangeable calcium in some tobacco fields 20-60 cm increased first and then decreased, while that in Chashi Town showed a downward-upward-downward trend, and the remaining tobacco fields did not change much. The content of exchangeable magnesium decreased slowly. The changes of available phosphorus, available potassium and exchangeable calcium in Chashi Town tobacco field were significantly different from those in other tobacco fields. The results of soil fertility suitability evaluation in Hengyang showed that the indexes of available phosphorus, alkali-hydrolyzable nitrogen and available potassium had significant restrictive effects on the soil fertility adaptability index (SFI) of typical tobacco fields in Hengyang. The fertility of typical tobacco fields reached medium and high levels as a whole, and only Hongshi Town had low fertility. In the future, soil nutrient conservation and fertilization optimization measures should be carried out to improve the content and effectiveness of phosphorus, potassium and magnesium in soil, so as to ensure the nutrient balance between tobacco fields and tobacco leaves in Hengyang.

         

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