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Objective The reticulated laterite in southern China is a good geological carrier for Quaternary environmental changes， but there is still a weakness in microscopic research on sandstone reticulation. Methods Through micro-area analysis techniques， geostatistical and factor analysis， and other methods， we conducted elemental geochemical analysis on the white vein micro-area of the sandstone and reticular red clay in the Langxi profile. Results （1）The content of iron group elements such as Fe2O3 （1.14%-13.29%） and Mn （87×10-6-3 230×10-6） in sandstone layers increased from the center of the white veins to the periphery. However， the spatial distribution of other major elements and stable elements such as Ti （1 294×10-6-2 454×10-6） and Zr （171 ×10-6-197×10-6） showed the opposite trend. The results of the reticulated red soil layer are consistent. （2） Ti/Zr （sandstone layer： 7.23-12.89； reticulated red soil layer： 12.82-21.84） and Ti/Al2O3 （sandstone layer： 0.013-0.018； reticulated red soil layer： 0.044-0.062） were divided into two groups through cluster analysis and scatter plots. The results show that they have different provenances. （3） The leaching intensity of elements such as Al2O3 （17.3%）， Fe2O3 （73.91%）， and MnO （76.68%） in the sandstone white vein micro-area and Al2O3 （15.78%） ， Fe2O3 （70.39%）， and MnO （74.84%） in the reticulated red soil layer white vein micro-area decreased from the center of the white veins to the periphery. （4） The common factors in the white vein micro-area of the sandstone layer and the reticulated red soil layer are that they reflect the leaching migration of iron and iron group elements in the white vein， as well as the relative enrichment process of constant elements such as Al2O3， SiO2，and K2O and stable elements such as Ti and Zr. Conclusions During reticulation， the leaching of iron group elements dominates， but other elements also have a certain degree of migration. Additionally， it exhibits spatial characteristics of strong leaching at the center of the network pattern and weak leaching at the periphery. Affected by local environmental differences， the development of reticulation is a spatial process that expands from the center of the reticulation to the periphery. The material composition inside the reticulate pattern is non spatially homogeneous. The sandstone and reticulated red soil layers have different material foundations， and the larger reticulation in the sandstone layer indicates that it experienced a relatively humid and hot climate during its development.
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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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