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This paper aimed to explore the arbuscular mycorrhizal (AM) fungal community structure in the rhizosphere soil of ratoon sugarcane in the second year under different fertilization levels, and provide a theoretical basis for the application of AM fungi in sugarcane. In this study, sugarcane varieties GT29 and GT58 were used as the materials. Four fertilization levels were set: 0.0 kg/hm2 (A), 562.5 kg/hm2 (B), 1125.0 kg/hm2 (C), 2250.0 kg/hm2(D). The results showed that different fertilization levels had significant effects on the root mycorrhizal infection rate of GT29, but had no significant effect on GT58. With the increase of fertilization level, the diversity and richness of AM fungi decreased significantly. With the increase of fertilization level, the diversity and richness of AM fungi decreased significantly. A total of 185 AM fungi OTUs were detected in GT29 and 175 in GT58. The dominant AM fungi in the rhizosphere soil of the two varieties under different fertilization levels were Glomus. The species diversity of AM fungal community in rhizosphere soil under different fertilization levels was analyzed at the OTU level. It was found that the two species of GT29 belonged to the genus Glomus, while the three species of GT58 belonged to the genus Claroidoglomus. Mantel test showed that the contents of Ca and Mg in soil were significantly positively correlated with the four genera, and the soil pH was also significantly positively correlated with the three genera. Therefore, excessive fertilization will significantly reduce the yield increase effect, cause soil acidification and excess phosphorus, and change the composition, diversity and richness of AM fungi community in sugarcane rhizosphere soil, but the varieties are different; Proper fertilization was helpful to enrich the diversity of soil AM fungi and promote the sustainable development of sugarcane yield.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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