Abstract
We used metagenomics to investigate the rhizosphere microbial community assembly and functions associated with different nutrient cycles in Chinese fir at different monoculture times and growth stages. Mantel test results indicated significant positive correlations between soil TP contents and bacterial communities. The concentrations of soil AP also exhibited a significantly positive association with the fungal community. The relative abundance of ko00720 and ko00680 increased from young-old stands to mature stands. It then decreased in over-mature plantations (45 years) and had a recovery in 102-year-old stands. The potential degradation pathway of cellulose had the highest abundance in 26-year-old stands than the other aged plantations. Potential N cycling processes were dominated by assimilatory nitrate reduction to ammonium and dissimilatory nitrate reduction to ammonium pathways. The variation-partitioning analysis revealed that three forms of N contents (NH4+-N, NO3−-N, and DON) comprised 7%, whereas the other soil properties constituted 15.6% variation in the relative abundance of the genes involved in N cycling. Thus, metagenomics elucidates the evolution characteristics of rhizomicrobial composition and their functional changes at different developmental stages of Chinese fir plantations, providing a suitable reference for the potential utilization of carbon and nitrogen properties.
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Claims 7
Claim · model-written summary
Soil TP content correlated positively with bacterial communities.
Verbatim
e0“significant positive correlations between soil TP contents and bacterial communities”
t0“Chinese Fir”
Claim · model-written summary
Soil AP concentration was positively associated with the fungal community.
Verbatim
e0“The concentrations of soil AP also exhibited a significantly positive association with the fungal community.”
t0“Chinese Fir”
Claim · model-written summary
The relative abundance of ko00720 and ko00680 rose from young-old to mature stands, fell in over-mature plantations and recovered in 102-year-old stands.
Verbatim
e0“The relative abundance of ko00720 and ko00680 increased from young-old stands to mature stands. It then decreased in over-mature plantations (45 years) and had a recovery in 102-year-old stands.”
t0“Chinese Fir”
Claim · model-written summary
The potential cellulose degradation pathway was most abundant in 26-year-old stands.
Verbatim
e0“The potential degradation pathway of cellulose had the highest abundance in 26-year-old stands than the other aged plantations.”
t0“Chinese Fir”
Claim · model-written summary
Potential nitrogen cycling was dominated by assimilatory and dissimilatory nitrate reduction to ammonium.
Not reportedDirection
Verbatim
e0“Potential N cycling processes were dominated by assimilatory nitrate reduction to ammonium and dissimilatory nitrate reduction to ammonium pathways.”
t0“Chinese Fir”
Claim · model-written summary
Three forms of nitrogen content explained 7% of variation in the relative abundance of nitrogen cycling genes.
- Taxon
- Chinese Firt0
- Compound
- NH4+-N, NO3−-N, and DONe0
- Outcome
- relative abundance of the genes involved in N cyclinge0
- Value
- 7%e0
Not reportedDirection
Verbatim
e0“three forms of N contents (NH4+-N, NO3−-N, and DON) comprised 7%, whereas the other soil properties constituted 15.6% variation in the relative abundance of the genes involved in N cycling.”
t0“Chinese Fir”
Claim · model-written summary
Other soil properties explained 15.6% of variation in the relative abundance of nitrogen cycling genes.
- Taxon
- Chinese Firt0
- Outcome
- relative abundance of the genes involved in N cyclinge0
- Value
- 15.6%e0
- Setting
- other soil propertiese0
Not reportedDirection
Verbatim
e0“the other soil properties constituted 15.6% variation in the relative abundance of the genes involved in N cycling.”
t0“Chinese Fir”