文章基本信息

标题：Elevated CO2 shifts the functional structure and metabolic potentials of soil microbial communities in a C4 agroecosystem
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作者：Jinbo Xiong ; Zhili He ; Shengjing Shi 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
期号：1
DOI：10.1038/srep09316
语种：English
出版社：Springer Nature
摘要：Atmospheric CO₂ concentration is continuously increasing, and previous studies have shown that elevated CO₂ (eCO₂) significantly impacts C₃ plants and their soil microbial communities. However, little is known about effects of eCO₂ on the compositional and functional structure, and metabolic potential of soil microbial communities under C₄ plants. Here we showed that a C₄ maize agroecosystem exposed to eCO₂ for eight years shifted the functional and phylogenetic structure of soil microbial communities at both soil depths (0–5 cm and 5–15 cm) using EcoPlate and functional gene array (GeoChip 3.0) analyses. The abundances of key genes involved in carbon (C), nitrogen (N) and phosphorus (P) cycling were significantly stimulated under eCO₂ at both soil depths, although some differences in carbon utilization patterns were observed between the two soil depths. Consistently, CO₂ was found to be the dominant factor explaining 11.9% of the structural variation of functional genes, while depth and the interaction of depth and CO₂ explained 5.2% and 3.8%, respectively. This study implies that eCO₂ has profound effects on the functional structure and metabolic potential/activity of soil microbial communities associated with C₄ plants, possibly leading to changes in ecosystem functioning and feedbacks to global change in C₄ agroecosystems.