生物炭改土对植烟土壤理化性状动态变化的影响

通过盆栽试验,研究了生物炭不同施用量对植烟土壤容重、pH值、有机质和速效养分含量及其在烤烟生长期内变化规律的影响。结果表明,每盆施用生物炭1~2 kg能显著降低土壤的容重,降幅在12%~20%,并且能提高土壤的pH值。土壤有机质含量与生物炭的施用量呈线性相关关系。施用生物炭能降低土壤碱解氮的含量,限制了土壤的氮素利用度;对土壤速效磷没有显著影响,能显著提高土壤速效钾的含量,并使土壤具备持续提供钾素的能力。

Effect of Biochar for Soil Amendment on Dynamic Variation of Tobacco Soil Physical and Chemical Properties

The pot experiments were conducted to study the influences of different biochar application levels on soil bulk density , pH value , organic matter and available nutrients contents and their change rules during tobacco growing period .The results showed that 1~2 kg biochar application in every pot could reduce the soil bulk density significantly by 12%~20%, but increased the pH value .The content of organic matter in soil was linearly correlated with the biochar application level .The application of Biochar reduced the con-tent of alkaline nitrogen in soil and restricted the nitrogen availability .Its application could improve the con-tent of available potassium in soil and make soil have the ability to continuously provide potassium , but had no significant effect on available phosphorus content .