Chu Haiyan

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Chu
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Haiyan
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  • Preprint
    Wheat rhizosphere harbors a less complex and more stable microbial co-occurrence pattern than bulk soil
    ( 2018-07-25) Fan, Kunkun ; Weisenhorn, Pamela B. ; Gilbert, Jack A. ; Chu, Haiyan
    The rhizosphere harbors complex microbial communities, whose dynamic associations are considered critical for plant growth and health but remain poorly understood. We constructed co-occurrence networks for archaeal, bacterial and fungal communities associated with the rhizosphere and bulk soil of wheat fields on the North China Plain. Rhizosphere co-occurrence networks had fewer nodes, edges, modules and lower density, but maintained more robust structure compared with bulk soil, suggesting that a less complex topology and more stable co-occurrence pattern is a feature for wheat rhizosphere. Bacterial and fungal communities followed a power-law distribution, while the archaeal community did not. Soil pH and microbial diversity were significantly correlated with network size and connectivity in both rhizosphere and bulk soils. Keystone species that played essential roles in network structure were predicted to maintain a flexible generalist metabolism, and had fewer significant correlations with environmental variables, especially in the rhizosphere. These results indicate that distinct microbial co-occurrence patterns exist in wheat rhizosphere, which could be associated with variable agricultural ecosystem properties.
  • Article
    Existing climate change will lead to pronounced shifts in the diversity of soil prokaryotes
    (American Society for Microbiology, 2018-10-23) Ladau, Joshua ; Shi, Yu ; Jing, Xin ; He, Jin-Sheng ; Chen, Litong ; Lin, Xiangui ; Fierer, Noah ; Gilbert, Jack A. ; Pollard, Katherine ; Chu, Haiyan
    Soil bacteria are key to ecosystem function and maintenance of soil fertility. Leveraging associations of current geographic distributions of bacteria with historic climate, we predict that soil bacterial diversity will increase across the majority (∼75%) of the Tibetan Plateau and northern North America if bacterial communities equilibrate with existing climatic conditions. This prediction is possible because the current distributions of soil bacteria have stronger correlations with climate from ∼50 years ago than with current climate. This lag is likely associated with the time it takes for soil properties to adjust to changes in climate. The predicted changes are location specific and differ across bacterial taxa, including some bacteria that are predicted to have reductions in their distributions. These findings illuminate the widespread potential of climate change to influence belowground diversity and the importance of considering bacterial communities when assessing climate impacts on terrestrial ecosystems.