土壤根际环境对烟草AM真菌定殖率和孢子密度的影响

目的]研究烟草栽培土壤因子对烟草AM真菌定殖率和孢子密度的影响。方法]检测山东日照和临沂烟区烟草根际土样理化性质,分析各土壤因子与烟草AM真菌定殖率、孢子密度的相关性。结果]日照和临沂烟草土样均含有土著AM真菌孢子;AM真菌孢子数与定殖率呈现非显著性负相关;土壤中的碱解氮与有机质含量对烟草AM真菌定殖率具有负相关性,有效磷、速效钾、pH和蔗糖酶活性则具有正相关性。随着速效磷、速效钾以及碱解氮含量的增加,AM真菌孢子数降低,而适量的有机质有利于提高土壤AM真菌孢子数。结论]影响烟草根系生长的土壤条件对AM真菌定殖率和孢子数有较大的影响。

Influence of Soil Chemical and Physical Properties on AM Fungi Infections and Spore Density of Tobacco in Shandong

Objective] The research aimed to study the influence of soil factors on AM fungi infections and spore density of tobacco in Shandong.Method] The chemical and physical properties of soils from Shandong Rizhao and Linyi were investigated.And the relationship between soil factors with Arbuscular mycorrhizal(AM) fungi infections and spore density of tobacco was analyzed.Result] The colonization and spore density of AM fungi changed in sampling sites.The colonization of AM fungi had no significant negative correlation with spore density.Organic matters and available nitrogen had a negative correlation with the colonization of AM fungi,while counteractive by the available phosphorus,potassium,pH and sucrose.The available P,K and N had a negative correlation with spore density,while suitable organic matter had an opposite effect.Conclusion] The soil environment,which affected the growth of plant roots,had more important impacts on the spore density and the colonization of AM fungi.