接种丛枝菌根真菌对土壤水稳性团聚体特征的影响

Influence of mycorrhizal inoculation on water stable aggregates traits

为了研究接种丛枝菌根真菌对土壤团聚体特征的影响,采用盆栽试验,以小麦(Triticum aestivuml)为宿主植物,在两个不同供磷水平条件下,分别接种丛枝菌根真菌Glomus intraradices和Glomus mosseae,收获后分析土壤团聚体数量、分布和分形维数,并运用通径分析对不同作用因子进行统计。结果看出,与对照相比,接种丛枝菌根真菌显著提高了土壤中有机质含量、球囊霉素相关土壤蛋白含量,土壤水稳性大团聚体数量也显著增加。接种处理提高了土壤的平均重量直径、几何平均直径,而且降低了土壤分形维数。通径分析表明,在影响土壤水稳性大团聚体的众多因子中,菌丝密度具有最大的作用,且以直接作用为主;有机质和球囊霉素相关土壤蛋白也表现出较大的作用。接种G. mosseae对改良土壤结构的作用优于接种G. intraradices。

Aimed to investigate the influence of arbuscular mycorrhizal fungi（AMF） inoculation on trait of aggregate,a pot experiment was carried with Triticum aestivuml（wheat） as host plants and two different arbuscular mycorrhizal fungus,Glomus intraradices and G.mosseae were inoculated under two phosphorus supplied level.After harvest,soil were screened through sieves with different sizes and then the amounts of different size of aggregates were measured to obtain geometric mean diameter,mean weight diameter and fractal features of soils,path analysis was also used to checkup the indirect or direct factors.The results showed that mycorrhizal inoculation increased soil organ matter concentration,glomalin related soil protein（GRSP） concentration and the amount of water stable aggregate（WSA） significantly compared with the non-mycorrhizal treatments.Mean weight diameter（MWD） and geometric mean diameter（GMD） of mycorrhizal soil were significantly higher than that of non-mycorrhizal soil while mycorrhizal inoculation decreased the value of fractal dimension（D） of mycorrhizal soil compared with the non-mycorrhizal soil.Our results indicated the important role of arbuscular mycorrhizal inoculation in improving quality of soil structure.The Path analysis results showed hyphae density had the highest index on WSA amount through direct effect mainly.The GRSP and organic matter had higher effects on WSA amount as well.For improving soil structure,the role of G.mosseae was better than that of G.intraradices.