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The changing patterns of soil chemical properties, enzyme activity, and microbial diversity in rubber plantations intercropped with three potato varieties (Jianchuanhong or JCH, Zishu or ZS, Daniujiao or DJN) were studied in this study. The results showed that rubber plantation intercropped with potatoes could significantly increase the soil organic matter, total nitrogen, total phosphorus, total potassium, alkaline dissolved nitrogen, effective phosphorus, soil β-glucosidase, N-acetyl β-D-glucosidase, acid phosphatase and aryl sulfatase activities, compared with rubber monoculture. There were significant differences among different potato varieties, with nutrient contents ranked as JCH>ZS>DJN, and enzyme activity ranked as DJN>JCH>ZS. Potatoes intercropped significantly increased the richness and diversity indexes of soil microorgnisms, and no significant differences among potato varieties. However, there was significant difference in the influence of different potato varieties on the abundance of specific microorgnisms in soil. The overall trend was that the abundance of specific bacterial such as Chloroflexi, Desulfobacterota were significantly decreased; the abundance of specific fungal such as Mortierellomycota, Chytridiomycota, and Kickxellomycota were significant increased. LEfSE analyses revealed that some beneficial microorganisms involved in material cycle or antagonistic to plant pathogens were enriched in the intercroppedg soil. DJN, ZS and JCH enriched 16, 26 and 31 marker microorganisms, respectively. Redundancy and correlation analysis showed that soil nutrient and enzyme activity were significantly correlated with the abundance of specific bacteria and fungi in the soil of rubber plantation. The increase of soil nutrients and enzyme activity decreased the abundance of specific bacterial and significantly increased the abundance of specific fungi. In conclusion, potato intercropped significantly increased soil nutrients, enzyme activity and soil microbial community diversity, but decreased the abundance of specific bacteria and increased the abundance of specific fungi. There were significant differences in the effects of different potato varieties on soil nutrients and enzyme activity, which may be related to the enrichment of different beneficial microorganisms. This study would provide a new idea and data support for the intercropping in rubber plantation.
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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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