Aims Understanding how soil aggregate stability (MWD) is influenced by microbial diversity and abundance can be crucial for ecological restoration in severely disturbed areas. We investigated the relationships between plant and soil microbial diversity and MWD of an ultramafic Ferralsol along a vegetational succession gradient in New Caledonia, where wildfires and extensive nickel mining have degraded the landscape. Methods Five plant communities were studied. For each one, MWD, soil physicochemical parameters (e.g. soil organic carbon (SOC)), plant root traits and fungal abundance were measured. The diversity and structure of plant and microbial communities were respectively assessed via botanical inventories and a metagenomic approach. A generalized linear model (GLM) was used to assess the influence of diversity indexes on MWD. Constrained ordinations (CCA) were performed to assess the influence of communities’ structures on MWD. Results GLM highlighted the linkage between SOC and MWD but did not identify any significant influence of diversity indexes on MWD. CCA revealed a significant influence of communities’ structures, especially the abundance of saprotrophic fungi, on MWD. Conclusions We showed that the structure, but not species richness and diversity of plants, soil fungi and bacteria influence aggregate stability on Ferralsols.

中文翻译：

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植物、土壤真菌和细菌的多样性是否会影响超基性铁矿的聚集体稳定性？热带生物多样性热点地区的宏基因组学方法

目的 了解土壤团聚体稳定性 (MWD) 如何受微生物多样性和丰度的影响对于严重干扰地区的生态恢复至关重要。我们在新喀里多尼亚沿着植被演替梯度研究了植物和土壤微生物多样性与超镁铁溶胶 MWD 之间的关系，那里的野火和广泛的镍矿开采使景观退化。方法对5个植物群落进行研究。对于每一种，都测量了 MWD、土壤理化参数（例如土壤有机碳 (SOC)）、植物根系性状和真菌丰度。植物和微生物群落的多样性和结构分别通过植物清单和宏基因组方法进行评估。广义线性模型（GLM）用于评估多样性指数对MWD的影响。进行约束排序 (CCA) 以评估社区结构对 MWD 的影响。结果 GLM 强调了 SOC 和 MWD 之间的联系，但没有发现多样性指数对 MWD 的任何显着影响。CCA 揭示了群落结构对 MWD 的显着影响，尤其是腐生真菌的丰度。结论 我们表明，植物、土壤真菌和细菌的结构而不是物种丰富度和多样性会影响 Ferralsols 的团聚体稳定性。