Moso bamboo invasion into coniferous forests transforms soil microbial communities in subtropical China
摘要
Moso bamboo (Phyllostachys edulis) is an invasive plant species against Japanese cedar (Cryptomeria japonica) plantation forest in subtropical nature reserves, China. However, the effects on soil bacterial and fungal communities caused by Moso bamboo invasion into Japanese cedar forests remain unclear. We performed high-throughput sequencing to compare the soil bacterial and fungal communities of pure Moso bamboo forests, mixed Moso bamboo-Japanese cedar forests, and pure Japanese cedar forests in southern China. The results showed that the invasion of Moso bamboo into Japanese cedar forests increased soil microbial diversity and abundance, and significantly decreased the relative abundance of Chloroflexi for soil bacteria (p < 0.05), whereas the mixed forests had the highest relative abundance of Glomeromycota and Mortierellomycota for soil fungi. Nonmetric multidimensional scaling analysis differentiated soil bacterial and fungal communities of pure Japanese cedar forests from those in pure Moso bamboo and mixed forests, indicating that the invasion likely ultimately changed mixed forests into Moso bamboo forests. Redundancy analysis and canonical correlation analysis revealed that soil total phosphorus was significantly associated with variations in bacterial (r2 = 0.88, p < 0.01) and fungal (r2 = 0.89, p < 0.01) communities in pure Japanese cedar forests, whereas the availability of soil phosphorus was significantly associated with variations in bacterial (r2 = 0.70, p < 0.05) and fungal communities (r2 = 0.65, p < 0.05) in pure Moso bamboo forests. Results from FAPROTAX analysis showed that aerobic chemoheterotrophy and chemoheterotrophy were the dominate functional groups across all samples. Theses study results indicated that the soil bacterial diversity was significantly enhanced and soil total phosphorus content was significantly decreased by the invasion of Moso bamboo into Japanese cedar forests. These changes will further facilitate the expansion of Moso bamboo.