Li Qiang, Song Ang, Yang Hui, Müller Werner E G
Key Laboratory of Karst Dynamics, MNR and GZAR, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, China.
International Research Center on Karst Under the Auspices of UNESCO, Guilin, China.
Front Microbiol. 2021 Mar 10;12:636405. doi: 10.3389/fmicb.2021.636405. eCollection 2021.
Microorganisms play critical roles in belowground ecosystems, and karst rocky desertification (KRD) control affects edaphic properties and vegetation coverage. However, the relationship between KRD control and soil bacterial communities remains unclear. 16S rRNA gene next-generation sequencing was used to investigate soil bacterial community structure, composition, diversity, and co-occurrence network from five ecological types in KRD control area. Moreover, soil physical-chemical properties and soil stoichiometry characteristics of carbon, nitrogen and phosphorus were analyzed. Soil N and P co-limitation decreased in the contribution of the promotion of KRD control on edaphic properties. Though soil bacterial communities appeared strongly associated with soil pH, soil calcium, soil phosphorus and plant richness, the key factor to determine their compositions was the latter via changed edaphic properties. The co-occurrence network analysis indicated that soil bacterial network complexity in natural ecosystem was higher than that in additional management ecosystem. , , and were recognized as the key taxa maintaining karst soil ecosystems in KRD control area. Our results indicate that natural recovery is the suitable way for restoration and rehabilitation of degraded ecosystems, and thus contribute to the ongoing endeavor to appraise the interactions among soil-plant ecological networks.
微生物在地下生态系统中发挥着关键作用，而石漠化治理会影响土壤性质和植被覆盖。然而，石漠化治理与土壤细菌群落之间的关系仍不清楚。利用16S rRNA基因二代测序技术，对石漠化治理区五种生态类型的土壤细菌群落结构、组成、多样性和共现网络进行了研究。此外，还分析了土壤理化性质以及土壤碳、氮、磷的化学计量特征。土壤氮磷共同限制降低了石漠化治理对土壤性质促进作用的贡献。虽然土壤细菌群落似乎与土壤pH值、土壤钙、土壤磷和植物丰富度密切相关，但决定其组成的关键因素是后者通过改变土壤性质来实现的。共现网络分析表明，自然生态系统中的土壤细菌网络复杂性高于其他管理生态系统。[此处原文中三个逗号处应补充相关内容，否则无法准确翻译完整]被认为是石漠化治理区维持喀斯特土壤生态系统的关键类群。我们的研究结果表明，自然恢复是退化生态系统恢复和重建的合适方式，从而有助于当前评估土壤-植物生态网络之间相互作用的努力。
