Rhizosphere bacterial community structure and nutrient cycling genes jointly drive the soil multifunctionality of Phoebe bournei young plantations under potassium fertilizer

作者：Ying Zhang, Xu Wang, Gongxiu He, Yuqing Geng, Chuxiang Chen, Jinjin Zhou, Zehao Li, Jiaqi Feng, Yingying Diao, Lili Yang, Zhixia Hou, Xie Zhang, Honggang Sun, Li Ji · 发表于：Global Ecology and Conservation · 年份：2025 · DOI：10.1016/j.gecco.2025.e03473 · 被引用次数：6 · 研究领域：Soil Carbon and Nitrogen Dynamics、Legume Nitrogen Fixing Symbiosis、Mycorrhizal Fungi and Plant Interactions

Potassium (K) plays a pivotal role in influencing the structure and function of soil microbial communities , thereby influencing soil multifunctionality. Researches on various fertilization practices for Phoebe bournei has primarily focused on microbial communities. However, the mechanism of functional potential of microbe in mediating the influence of K on soil multifunctionality remains insufficiently elucidated. Here, the experiment included five K additions (CK, 0 g; K1, 60 g; K2, 120 g; K3, 180 g; and K4, 240 g per plant) in P. bournei young plantations via 16S rRNA sequencing and quantitative microbial element cycling (QMEC) smart chip technology to investigate the impacts of K additions on rhizosphere soil bacterial community attributes, nutrient cycling genes (carbon, nitrogen, phosphorus), and soil multifunctionality. K additions decreased bacterial diversity, while enhancing the abundance of genes involved in C degradation, including those related to labile and recalcitrant C, as well as N cycling, P cycling, and soil multifunctionality. Comparatively, K1 and K2 additions had slight effects on soil multifunctionality, bacterial communities and the abundance of C, N and P cycling genes. PLS-PM results demonstrated that K additions improve soil multifunctionality indirectly by altering bacterial community structure and network complexity, as well as the functional potential linked to N and P cycling. Additionally, soil abiotic factors are the was the core predictor fo...