Keystone microbial phylotypes support plant productivity along a gradient of degradation in alpine wetlands of Tibetan Plateau

IF 3.9 2区 农林科学 Q1 AGRONOMY
Liyan Zhang, Chunjiang Yin, Xin Jing, Hao Wang, Jin-Sheng He, Haiyan Chu
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Abstract

Aims

Net primary productivity (NPP) is critical for understanding carbon sink and ecosystem functions, especially in alpine wetlands that degrade rapidly. Soil keystone taxa serve as ecosystem engineers and may influence aboveground NPP (ANPP), but this is poorly understood. Here, we analyzed the ANPP from 2012 to 2014 in alpine wetlands on the Qinghai-Tibetan Plateau to investigate the relationships between soil biodiversity of keystone phylotypes and ANPP.

Methods

The bacterial 16S rRNA gene was amplified using prokaryotic universal primers 515F and 907R, the archaeal 16S rRNA gene was amplified using primers Arch519F and Arch915R, and the eukaryotic 18S rRNA gene was amplified using primers Euk1391f and EukBr.

Results

Plant diversity was positively correlated with ANPP (R2 = 0.25, P < 0.001). The diversity of soil archaea was positively correlated with ANPP (R2 = 0.24, P < 0.001), with bacteria and eukaryotes showing no significant statistical relationships. The microbial network analysis revealed three major ecological clusters (Clusters 1–3) accounting for 98.8% of the constructed microbial co-occurrence networks. Diversity of Cluster 2 was more strongly positively correlated with ANPP than Cluster 1 and Cluster 3. Structural equation model analysis demonstrated that the contribution of plant diversity to ANPP was offset by soil biodiversity, especially coexisting phylotypes in ecological clusters.

Conclusions

Our results indicate that keystone phylotypes are associated with plant productivity, and highlight the need to conserve them to ensure the sustainable provision of alpine ecosystem services in fragile alpine ecosystems. 

青藏高原高寒湿地沿退化梯度的关键微生物类群支持植物生产力
初级生产力(NPP)对认识碳汇和生态系统功能至关重要,特别是在退化迅速的高寒湿地。土壤拱心类群作为生态系统工程师,可能影响地上NPP (ANPP),但目前对其了解甚少。本文以青藏高原高寒湿地为研究对象,分析了2012 - 2014年土壤ANPP变化,探讨了关键种型土壤生物多样性与ANPP之间的关系。方法采用原核通用引物515F和907R扩增细菌16S rRNA基因,采用引物Arch519F和Arch915R扩增古细菌16S rRNA基因,采用引物Euk1391f和EukBr扩增真核生物18S rRNA基因。结果植物多样性与ANPP呈正相关(R2 = 0.25, P < 0.001)。土壤古细菌多样性与ANPP呈显著正相关(R2 = 0.24, P < 0.001),细菌与真核生物多样性差异无统计学意义。微生物网络分析显示,3个主要生态集群(集群1-3)占构建的微生物共生网络的98.8%。集群2的多样性与ANPP的正相关强于集群1和集群3。结构方程模型分析表明,植物多样性对ANPP的贡献被土壤生物多样性,特别是生态集群中共存的种型所抵消。结论重点植物种型与植物生产力密切相关,为确保脆弱的高寒生态系统可持续地提供高寒生态系统服务,需要对其进行保护。
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来源期刊
Plant and Soil
Plant and Soil 农林科学-农艺学
CiteScore
8.20
自引率
8.20%
发文量
543
审稿时长
2.5 months
期刊介绍: Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.
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