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This study investigated the differences in soil physicochemical properties under three different land-use types, eucalyptus forest, orchard and rubber plantation, developed from granite-derived soils in Danzhou city, Hainan province. The results demonstrated that land use significantly influenced soil nutrient and acidity characteristics: rubber plantation soils showed significantly higher organic matter and total nitrogen content compared to other land uses, but also the most severe acidification with exchangeable aluminum content approximately 3.06 and 3.53 times higher than that in eucalyptus forests and orchards; Orchard soils were characterized by abnormal phosphorus enrichment, with available phosphorus content about 5.62 and 10.46 times higher than that in rubber plantations and eucalyptus forests, respectively, accompanied by strong base cation leaching and the lowest cation exchange capacity (CEC); Soils in Eucalyptus forests exhibited intermediate properties with relatively milder acidification. In terms of soil structure, rubber plantations were dominated by >5 mm aggregates. Combined with its most severe acidification and highest exchangeable aluminum content, this aggregate distribution pattern may indicate poor stability of large aggregates under strong acid and high aluminum toxicity environments. Although rubber plantation soils had CEC values approximately 2.47 and 3.02 times higher than those in Eucalyptus forests and orchards, respectively, the base saturation was extremely low, reflecting a significant contradiction between nutrient retention capacity and actual fertility availability. This study preliminarily suggests that the accumulation of high organic matter in rubber plantation soils may be associated with substantial litter input from rubber trees, while strong acidification and high aluminum toxicity are likely driven by continuous nitrogen cycling processes. The phosphorus enrichment in orchards primarily results from long-term excessive phosphorus fertilization. These findings provide a scientific basis for soil management and acidification control in tropical granite-derived regions under different land-use types.
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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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