基因组
硝化作用
营养循环
环境化学
土壤微生物学
生态系统
化学
土工试验
反硝化
微生物群
自行车
营养物
微生物种群生物学
土壤水分
氮气循环
生物
环境科学
生态学
磷
氮气
细菌
基因
有机化学
考古
遗传学
生物化学
生物信息学
历史
作者
Xingjie Wu,Jingjing Peng,Pengfei Liu,Qicheng Bei,Christopher Rensing,Yong Li,Hang Yuan,Werner Liesack,Fusuo Zhang,Zhenling Cui
标识
DOI:10.1016/j.scitotenv.2021.147329
摘要
The soil microbiome, existing as interconnected communities closely associated with soil aggregates, is the key driver in nutrient cycling. However, the underlying genomic information encoding the machinery of the soil microbiome involved in nutrient cycling at the soil aggregate scale is barely known. Here comparative metagenomics and genome binning were applied to investigate microbial functional profiles at the soil aggregate scale under different organic material amendments in a long-term field experiment. Soil samples were sieved into large macroaggregates (>2 mm), macroaggregates (0.25–2 mm) and microaggregates (<0.25 mm). Microbial taxonomic and functional alpha diversity were significantly correlated to soil NO3− and SOC. The highest abundance of nasB, nirK, and amoA genes, which are responsible for denitrification and ammonia oxidizers driving nitrification, was observed in microaggregates. Both manure and peat treatments significantly decreased the abundance of napA and nrfA that encode enzymes involved in dissimilatory nitrate reduction to ammonium (DNRA). As a biomarker for soil inorganic P solubilization, the relative abundance of gcd was significantly increased in macroaggregates and large macroaggregates. Three nearly complete genomes of Nitrososphaeraceae (AOA) and seven bacterial genomes were shown to harbor a series of genes involved in nitrification and P solubilization, respectively. Our study provides comprehensive insights into the microbial genetic potential for DNRA and P-solubilizing activity across different soil aggregate fractions and fertilization regimes.
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