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Stylosanthes guianensis, Pueraria phaseoloides, and Tephrosia candida were selected to investigate the impact mechanisms of green manures on soil physicochemical properties and nitrogen content in rubber tree leaves, through the analysis of natural abundance of 15N (δ15N) and partial least squares path analysis (PLS-PM) to elucidate the effects of different leguminous green manures on soil improvement and nitrogen uptake in young rubber plantations. Results showed that P. phaseoloides and S.guianensis treatments significantly increased soil alkaline nitrogen by 30.54% and 31.25%, respectively, while reducing available potassium by 8.40% and 6.87%, compared to natural grass cover. P. phaseoloides treatment had the strongest effect on increasing soil organic matter and available phosphorus content, with increases of 12.60% and 30.94%, respectively. S. guianensis treatment had the strongest effect on increasing the total nitrogen content in rubber trees leaves (an increase of 25.86%). Correlation analysis and PLS-PM indicated a significant positive correlation between leguminous green manures and soil alkaline nitrogen and total nitrogen content, with a significant positive effect. In conclusion, under the conditions of this study, leguminous green manures promoted the absorption and accumulation of nitrogen in rubber tree leaves by increasing soil alkaline nitrogen content. The rational selection or mixed planting of leguminous green manures can improve the nutrient absorption efficiency of rubber trees and contribute to the sustainable production of rubber plantations.
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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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