Soil phosphorus cycling microbial functional genes of monoculture and mixed plantations of native tree species in subtropical China

作者：Qin Lin, Zhirou Xiao, Angang Ming, Jinqian Teng, Hao Zhu, Jiaqi Qin, Zeli Liang · 发表于：Frontiers in Microbiology · 年份：2024 · DOI：10.3389/fmicb.2024.1419645 · 被引用次数：13 · 研究领域：Soil Carbon and Nitrogen Dynamics、Mycorrhizal Fungi and Plant Interactions、Soil and Water Nutrient Dynamics

Background Transforming coniferous plantation into broadleaved or mixed broadleaved-coniferous plantations is the tendency of forest management strategies in subtropical China. However, the effects of this conversion on soil phosphorus (P) cycling microbial functional genes are still unknown. Methods Soil samples were collected from 0–20, 20–40, and 40–60 cm (topsoil, middle layer, and subsoil, respectively) under coniferous Pinus massoniana (PM), broadleaved Erythrophleum fordii (EF), and their mixed (PM/EF) plantation in subtropical China. Used metagenomic sequencing to examine the alterations of relative abundances and molecular ecological network structure of soil P-cycling functional genes after the conversion of plantations. Results The composition of P-cycling genes in the topsoil of PM stand was significantly different from that of PM/EF and EF stands ( p < 0.05), and total phosphorus (TP) was the main factor causing this difference. After transforming PM plantation into EF plantation, the relative abundances of P solubilization and mineralization genes significantly increased in the topsoil and middle layer with the decrease of soil TP content. The abundances of P-starvation response regulation genes also significantly increased in the subsoil ( p < 0.05), which may have been influenced by soil organic carbon (SOC). The dominant genes in all soil layers under three plantations were phoR, glpP, gcd, ppk, and ppx. Transforming PM into EF plantation appare...