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Dynamic variability of soil diazotrophs in bulk-rhizosphere and phenological stages under long-term mulching in an eroded area in the Loess Plateau
Land Degradation & Development ( IF 4.7 ) Pub Date : 2021-10-09 , DOI: 10.1002/ldr.4122
Jiaqi Hao 1, 2 , Fu Zhang 1, 2 , Zhenyuan Liu 1, 2 , Qi Yu 1, 2 , Gaihe Yang 1, 2 , Guangxin Ren 1, 2 , Xinhui Han 1, 2 , Xiaojiao Wang 1, 2 , Chengjie Ren 1, 2 , Yongzhong Feng 1, 2
Affiliation  

Free-living diazotrophs play a significant role in the process of soil biological nitrogen fixation. Long-term field management has a cumulative effect on soil microbial communities. However, after long-term mulching measures in erosion areas, the stability difference in diazotrophs in bulk-rhizosphere soil and the temporal dynamic changes remain unclear. In this study, we analysed the dynamic variability of soil diazotrophic community structures using high-throughput sequencing. The result of Chao1 diversity index showed that mulching effectively increased the richness of soil diazotrophs. Combining the community composition, it was found that the diversity level of the soil diazotrophic community under mulching decreased more drastically along the development stages compared with no-tillage, and Bradyrhizobium played a major role in nitrogen fixation. In rhizosphere soil, mulching promoted the relative abundances of Azohydromonas, Bradyrhizobium, and Skermanella. Co-occurrence network analysis indicated that mulching measures strengthened the connection between the dominant components to improve the aggregation of the network. The partial least squares-path model showed that the richness of diazotrophs in rhizosphere soil had an indirect effect on mulching through the available carbon and nitrogen nutrients of bulk soil, thereby improving the response rate to environmental variables. Overall, our findings showed that under long-term mulching, the richness and aggregation of dominant components of the soil diazotrophic community increased with the phenological period and distance from roots, revealing the importance of mulching in eroded areas to improve farmland soil nitrogen fixation capacity. This study provides a theoretical reference for microecology to effectively improve soil fertility in similar areas.

中文翻译:

黄土高原侵蚀区长期覆盖下大块根际和物候阶段土壤固氮菌的动态变化

自由生活的固氮菌在土壤生物固氮过程中发挥着重要作用。长期田间管理对土壤微生物群落具有累积效应。然而,在侵蚀区长期覆盖措施后,大块根际土壤中固氮菌的稳定性差异和时间动态变化尚不清楚。在这项研究中,我们使用高通量测序分析了土壤固氮群落结构的动态变异性。Chao1多样性指数结果表明,覆盖有效地增加了土壤固氮菌的丰富度。结合群落组成发现,与免耕相比,覆盖下土壤固氮群落的多样性水平在发育阶段下降幅度更大,Bradyrhizobium在固氮中起主要作用。在根际土壤,地膜覆盖推广的相对丰度Azohydromonas根瘤菌Skermanella. 共现网络分析表明,覆盖措施加强了主导成分之间的联系,以提高网络的聚合度。偏最小二乘路径模型表明,根际土壤中固氮菌的丰富度对覆盖大块土壤的有效碳氮养分有间接影响,从而提高了对环境变量的响应率。总体而言,我们的研究结果表明,在长期覆盖下,土壤固氮群落主要成分的丰富度和聚集度随着物候期和距根部距离的增加而增加,揭示了在侵蚀地区覆盖对提高农田土壤固氮能力的重要性。
更新日期:2021-12-17
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