Soil microbial diversity and network complexity promote phosphorus transformation - a case of long-term mixed plantations of Eucalyptus and a nitrogen-fixing tree species
文献类型： 外文期刊
作者： Li, Jiyin 1 ; You, Yeming 1 ; Zhang, Wen 3 ; Wang, Yi 4 ; Liang, Yuying 1 ; Huang, Haimei 1 ; Ma, Hailun 1 ; He, Qinxia 1 ; Ming, Angang 2 ; Huang, Xueman 1 ;
作者机构： 1.Guangxi Univ, Guangxi Coll & Univ Key Lab Cultivat & Utilizat Su, Coll Forestry, Guangxi Key Lab Forest Ecol & Conservat, Nanning 530004, Guangxi, Peoples R China
2.Youyiguan Forest Ecosyst Observat & Res Stn Guangx, Guangxi Youyiguan Forest Ecosyst Natl Observat & R, Pingxiang 532600, Guangxi, Peoples R China
3.Jiangxi Acad Agr Sci, Jinggangshan Inst Red Soil, Jian 343016, Jiangxi, Peoples R China
4.Int Ctr Bamboo & Rattan, Beijing Bamboo & Rattan Sci & Technol, Inst Resources & Environm, Key Lab,Natl Forestry & Grassland Adm, Beijing 100102, Peoples R China
5.Chinese Acad Forestry, Expt Ctr Trop Forestry, Pingxiang 532600, Peoples R China
期刊名称：BIOGEOSCIENCES （ 影响因子：3.9； 五年影响因子：4.7 ）
ISSN： 1726-4170
年卷期： 2025 年 22 卷 16 期
页码：
收录情况： SCI
摘要： Increased nitrogen (N) availability influences soil phosphorus (P) cycling through multiple pathways. Soil microorganisms are essential facilitating a wide range of ecosystem functions. However, the impact of how mixed plantations of Eucalyptus and N-fixing tree species affect P transformation and microbiota interactions remains unknown. Therefore, we conducted a 17 y field experiment comparing pure Eucalyptus plantations (PPs) and mixed plantations (MPs) with Eucalyptus and an N-fixing tree species to assess their effects on soil P transformation, using data collected from two soil layers (0-10 and 10-20 cm). The results showed that alpha-diversity indices (ACE, Chao1, and Shannon indices) were significantly higher in MPs than in PPs for both bacteria and fungi. Furthermore, MPs exhibited significantly higher relative abundances of bacterial phyla Proteobacteria (0-10 cm), Verrucomicrobia, and Rokubacteria, as well as fungal phyla Mortierllomycota, Mucoromycota, and Rozellomycota. Conversely, MPs showed lower abundances of the bacterial phyla Chloroflexi, Actinobacteria, and Planctomycetes and the fungal phylum Ascomycota. Gene copy numbers of functional genes were also elevated in MPs, including 16S rRNA, internal transcribed spacer (ITS), N functional genes [nifH (0-10 cm), AOB-amoA, narG, nirS, and nosZ (0-10 cm)], and P functional genes [phoC, phoD (0-10 cm), BPP, and pqqC]. The findings indicate that MPs can enhance soil microbial diversity, network complexity, and the relative abundance of functional genes, which involved N and P transformation, by optimizing soil nutrient levels and pH, thereby facilitating P transformation. Therefore, MPs of Eucalyptus and N-fixing tree species may represent a promising forest management strategy to improve ecosystem P benefits.
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