Soil microbes regulate forest succession in a subtropical ecosystem in China: evidence from a mesocosm experiment
Soil microbes regulate forest succession in a subtropical ecosystem in China: evidence from a mesocosm experiment
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土壤微生物调节中国亚热带生态系统的森林演替：来自中生态系统实验的证据
DOI：
10.1007/s11104-018-3733-3
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发表时间：
2018-09-01
期刊：
影响因子：
4.9
通讯作者：
Peng, Shaolin
中科院分区：
文献类型：
--
作者：
Liao, Huixuan;Huang, Fangfang;Peng, Shaolin
目的生态林演替会受到植物-植物相互作用的影响，这种相互作用对演替早期和后期的物种产生不同的影响。本研究探讨了植物-植物间接相互作用在森林演替中的作用及其潜在的微生物机制。方法以中国亚热带广泛分布的中演替树种木荷为模式物种，研究了接种木荷根际土壤对两种早期演替树种(马尾松和毛白花红杉)和两种晚演替树种(隐果核桃)的影响。利用偏最小二乘通径模型检验植物生长性能与土壤微生物组成的所有直接和间接相关性。结果鞭毛虫抑制演替早期物种的生长，对演替后期物种的生长影响不大。接种降低了非丛枝菌根真菌(Non-AMF)在两个物种组中的定殖率，但增加了丛枝菌根真菌(AMF)在演替后期物种中的定殖率。随着接种量的增加，早期演替树种的根系病损百分率增加，而演替后期树种的病根病斑百分率降低。植物养分的获取对接种没有反应。根据通径模型，土壤微生物可以解释演替早期物种51%的生长变异，但几乎解释不了演替后期物种的任何生长变异。结论Schimamia可能通过抑制非AMF和演替早期物种之间的互惠关系来增加演替后期物种相对于演替早期物种的竞争优势，从而促进森林演替。
AimsEcological forest succession can be influenced by plant-plant interactions that exert contrasting effects on early- and late-successional species. In this study, we explored the role of indirect plant-plant interactions and the underlying microbial mechanisms in forest succession.MethodsIn a mesocosm experiment, we usedSchima superba, a widespread mid-successional species in subtropical China, as a model species to explore how inoculating the rhizosphere soil ofSchimaaffected the performances of two early-successional species (Pinus massonianaandRhodomyrtus tomentosa) and two late-successional species (Cryptocarya chinensisandMachilus chinensis). All direct and indirect correlations between plant performance and soil microbial composition were examined using partial least square path models.ResultsSchimainoculum inhibited the growth of the early-successional species but had little effect on the growth of the late-successional species. Inoculation reduced non-arbuscular mycorrhizal fungi (non-AMF) colonization in both species groups but increased arbuscular mycorrhizal fungi (AMF) colonization in the late-successional species. The percentage of root lesions in the early-successional species increased with inoculation, while that in the late-successional species decreased. Plant nutrient acquisition was not responsive to inoculation. According to the path models, soil microbes explained 51% of the growth variances in the early-successional species but barely explained any growth variances in the late species.ConclusionsSchimamay increase the competitive advantage of the late-successional species over early-successional species by inhibiting the mutualistic association between non-AMF and the latter, which in turn may facilitate forest succession.