【作者】 彭思利； 魏朝富； 郭涛；

【Author】 PENG Sili WEI Chaofu GUO Tao (College of Resources and Environment,Southwest University,Chongqing,400716,China)

【机构】 西南大学资源环境学院；

【摘要】 本研究利用分根装置研究了接种不同丛枝菌根真菌对中性紫色土土壤团聚体数量、大小和稳定性的研究,分析了土壤团聚体数量、分布和分形维数,并运用通径分析对不同作用因子进行了分析。结果表明:接种G.intraradices和G.mosseae的菌根室土壤有机质和球囊霉素相关土壤蛋白含量有增加的趋势;湿筛条件下菌根室土壤的平均重量直径(MWD)和几何平均直径(GMD)均显著高于根室土壤,而且降低了土壤分形维数,从而提升了土壤结构特征。通径分析的结果表明,在影响MWD的众多因子中,侵染率虽然对MWD具有最大的效应,但以间接作用为主,而菌丝密度对MWD最大的直接作用。两种菌种表现出对土壤结构改良作用的不同,反映了丛枝菌根真菌功能的多样性。更多还原

【Abstract】 To investigate the influence of arbuscular mycorrhizal(AM) inoculation on trait of aggregate in the neutral purple soil,split root device was used and the soil were screened through sieves with different sizes and then measured the amounts of different size of aggregate,path analysis was also used to checkup the indirect or direct factors.The results showed that inoculation with both G.intraradices and G.mosseae tend to increase the organic matter and glomalin related soil protein (GRSP) concentration in mycorrhizal soil.Mean weight diameter(MWD) and geometric mean diameter(GMD) with wet -sieve methods in mycorrhizal compartment were significantly higher than that of root compartment while the effect of mycorrhizal inoculation was in contrast on fractal features and all these results sustained the important role of arbuscular mycorrhizal inoculation in improving quality of soil structure.The Path analysis results indicated that inoculation rate had the highest index on MWD but through indirect effect mainly while hyphae density had the highest direct effect.The different ability of AM fungus to improve soil structure revealed the function diversity of arbuscular mycorrhizal fungus.更多还原