The campo rupestre vegetation in the Serra do Rola Moça State Park (PESRM) grows on ironstone outcrops, forming vegetation islands where plant species establish belowground interactions. This area is circumscribed by several mining companies and, for mined land rehabilitation purpose, we assessed plant species composition, plat-microbial associations, and soil fertility patterns in a preserved campo rupestre. Aside from high plant biodiversity, we found elevated soil fertility in relation to soil CEC (~18 cmol/dm³), organic matter (~115 g/Kg), soil C (~ 53.3 g/Kg), humic (~12.5 g/Kg) and fulvic (~8.9 g/Kg) acids, soil N (~4 g/kg) and a low C:N ratio (~12). The overall nutrient levels were higher than or comparable to those of other preserved sites in Brazil. The prevalent legume Mimosa calodendron, hosting N-fixing and plant growth-promoting bacteria in its nodules, was considered an N source to the soil, as evidenced by the elevated leaf N content and the greater depletion of leaf δ¹⁵N compared to other families. However, leaf N was parsimoniously distributed among biogeochemical islands and within different plant species and families, which was attributed to a common mycorrhizal network (CMN) formed by arbuscular (AMF) and orchid mycorrhizal fungi (OMF), suggested by general root mycorrhizal colonisation and soil phospholipid fatty acid (PLFA) analyses. We revealed that a high C- and N-based soil fertility constitutes a natural pattern of fertility, which is maintained by below-ground associations and is sufficient to sustain plant biodiversity. For rehabilitation purposes, this natural soil fertility of preserved sites should be maintained by integrating the biogeochemical relations involving plant communities and microbial associations.

Serra do RolaMoça国家公园（PESRM）中的Campo rupestre植被生长在铁石露头上，形成了植被岛，植物物种在此建立了地下相互作用。该地区由数家采矿公司限制，出于矿区恢复的目的，我们评估了保留的坎波鲁佩斯特里的植物物种组成，平台微生物群落和土壤肥力模式。除了高植物多样性外，我们还发现土壤肥力相对于土壤CEC（〜18 cmol / dm ³），有机物（〜115 g / Kg），土壤C（〜53.3 g / Kg），腐殖酸（〜12.5 g / Kg）和黄腐酸（〜8.9 g / Kg）酸，土壤N（〜4 g / kg） C：N比低（〜12）。总体营养水平高于或与巴西其他保存地点的营养水平相当。普遍豆科含羞草calodendron，托管固氮和植物生长促进在其结节菌，被认为是一个N源到土壤中，通过升高叶N含量和叶的δ越大耗尽所证明¹⁵N与其他家庭相比。然而，叶N简约地分布在生物地球化学岛之间以及不同的植物物种和科中，这归因于丛枝根真菌定植和土壤磷脂脂肪酸（PLFA）分析。我们发现，高的基于C和N的土壤肥力构成了一种自然的肥力模式，这种肥力由地下协会维持，足以维持植物的生物多样性。为了恢复，应通过整合涉及植物群落和微生物协会的生物地球化学关系来维持自然保护区的土壤肥力。