Soil diazotrophic abundance, diversity, and community assembly mechanisms significantly differ between glacier riparian wetlands and their adjacent alpine meadows.
Soil diazotrophic abundance, diversity, and community assembly mechanisms significantly differ between glacier riparian wetlands and their adjacent alpine meadows.
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DOI：
10.3389/fmicb.2022.1063027
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发表时间：
2022
影响因子：
5.2
通讯作者：
Che, Rongxiao
中科院分区：
文献类型：
--
作者：
Chen, Danhong;Hou, Haiyan;Zhou, Shutong;Zhang, Song;Liu, Dong;Pang, Zhe;Hu, Jinming;Xue, Kai;Du, Jianqing;Cui, Xiaoyong;Wang, Yanfen;Che, Rongxiao
全球变暖会导致冰川面积急剧萎缩，冰川径流量发生变化，从而导致河岸湿地的扩张和退缩。这促进了河岸湿地及其邻近生态系统的相互转化（例如，高山草甸），可能会显着影响生态系统的氮输入通过改变土壤重氮营养群落。然而，冰川河岸湿地及其邻近生态系统之间的土壤固氮生物群落的差异仍然在很大程度上未被探索。在这里，土壤从纳木错流域典型的西藏冰川河流沿线从冰川前陆到湖口沿着的6个地点的河岸湿地及其相邻的高山草甸收集。利用nifH基因的实时荧光定量PCR和扩增子测序技术对土壤重氮微生物的丰度和多样性进行了测定。利用基于零模型的iCAMP方法分析了土壤固氮菌群落的组装机制。结果表明，与河岸湿地相比，高寒草甸土壤固氮菌的丰度和多样性明显降低。河岸湿地和高寒草甸土壤固氮营养菌群落结构也存在显著差异。例如，与高山草甸相比，化能异养和硫酸盐呼吸固氮菌在河岸湿地土壤中的相对丰度显著较高。与此相反，与尿素分解、光合自养和反硝化作用相关的固氮菌在高寒草甸土壤中明显富集。iCAMP分析表明，重氮营养菌群落的聚集主要受漂移和扩散限制的控制。与河岸湿地相比，高寒草甸土壤固氮生物群落的聚集更多地受到扩散限制和同质选择的影响。这些研究结果表明，河岸湿地和高山草甸的转换可以显着改变土壤氮营养群落和可能的生态系统氮输入机制，突出了气候变化对高山生态系统的巨大影响。
Global warming can trigger dramatic glacier area shrinkage and change the flux of glacial runoff, leading to the expansion and subsequent retreat of riparian wetlands. This elicits the interconversion of riparian wetlands and their adjacent ecosystems (e.g., alpine meadows), probably significantly impacting ecosystem nitrogen input by changing soil diazotrophic communities. However, the soil diazotrophic community differences between glacial riparian wetlands and their adjacent ecosystems remain largely unexplored. Here, soils were collected from riparian wetlands and their adjacent alpine meadows at six locations from glacier foreland to lake mouth along a typical Tibetan glacial river in the Namtso watershed. The abundance and diversity of soil diazotrophs were determined by real-time PCR and amplicon sequencing based on nifH gene. The soil diazotrophic community assembly mechanisms were analyzed via iCAMP, a recently developed null model-based method. The results showed that compared with the riparian wetlands, the abundance and diversity of the diazotrophs in the alpine meadow soils significantly decreased. The soil diazotrophic community profiles also significantly differed between the riparian wetlands and alpine meadows. For example, compared with the alpine meadows, the relative abundance of chemoheterotrophic and sulfate-respiration diazotrophs was significantly higher in the riparian wetland soils. In contrast, the diazotrophs related to ureolysis, photoautotrophy, and denitrification were significantly enriched in the alpine meadow soils. The iCAMP analysis showed that the assembly of soil diazotrophic community was mainly controlled by drift and dispersal limitation. Compared with the riparian wetlands, the assembly of the alpine meadow soil diazotrophic community was more affected by dispersal limitation and homogeneous selection. These findings suggest that the conversion of riparian wetlands and alpine meadows can significantly alter soil diazotrophic community and probably the ecosystem nitrogen input mechanisms, highlighting the enormous effects of climate change on alpine ecosystems.
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DOI：
10.1093/database/bau001
发表时间：
2014
期刊：
Database : the journal of biological databases and curation
影响因子：
--
作者：
Gaby JC;Buckley DH
通讯作者：
Buckley DH
影响因子：
--
作者：
BRAY, RH;KURTZ, LT
通讯作者：
KURTZ, LT
影响因子：
9.8
作者：
Cao, Jianjun;Jiao, Yumeng;Feng, Qi
通讯作者：
Feng, Qi
影响因子：
3
作者：
Ayub, Sobia;Akhter, Gulraiz;Iqbal, Mehwish
通讯作者：
Iqbal, Mehwish
影响因子：
48
作者：
Edgar, Robert C.
通讯作者：
Edgar, Robert C.