Microbial network structure, not plant and microbial community diversity, regulates multifunctionality under increased precipitation in a cold steppe

作者：Xuechen Yang, Wenzheng Song, Xue Yang, Tianxue Yang, Wenqing Bao, Chengliang Wang, Junqin Li, Shangzhi Zhong, Qi Jiang, Lu‐Jun Li, Wei Sun · 发表于：Frontiers in Microbiology · 年份：2024 · DOI：10.3389/fmicb.2023.1349747 · 被引用次数：20 · 研究领域：Microbial Community Ecology and Physiology、Gut microbiota and health、Species Distribution and Climate Change

It is known that the dynamics of multiple ecosystem functions (i. e., multifunctionality) are positively associated with microbial diversity and/or biodiversity. However, how the relationship between microbial species affects ecosystem multifunctionality remains unclear, especially in the case of changes in precipitation patterns. To explore the contribution of biodiversity and microbial co-occurrence networks to multifunctionality, we used rainfall shelters to simulate precipitation enhancement in a cold steppe in Northeast China over two consecutive growing seasons. We showed that an increased 50% precipitation profoundly reduced bacterial diversity and multidiversity, while inter-annual differences in precipitation did not shift microbial diversity, plant diversity, or multidiversity. Our analyses also revealed that increased annual precipitation significantly increased ecosystem, soil, nitrogen, and phosphorous cycle multifunctionality. Neither increased precipitation nor inter-annual differences in precipitation had a significant effect on carbon cycle multifunctionality, probably due to the relatively short period (2 years) of our experiment. The co-occurrence network of bacterial and fungal communities was the most dominant factor affecting multifunctionality, the numbers of negative interactions but not positive interactions were linked to multifunctionality. In particular, our results provided evidence that microbial network topological features are crucial for maint...