Abstract
Abstract The fundamental ecosystem processes in soil are regulated by microbial communities, and community diversity is implicated by soil environmental conditions. Humic acid (HA) improves soil quality and fertility, stimulating the microbial environment, but the detailed effects remain poorly understood. We investigated the effects of HA rates on soil bacterial diversity, particularly on species richness and community composition in the rhizosphere of corn ( Zea mays ). Inorganic fertilizer (T2), HA 0.5% (T3), HA 1.0% (T4), HA 1.5% (T5), and HA 2.0% (T6) were applied in soil. Initial soil (O1) and control after harvesting (T1) were included. A total of 3601 operational taxonomic units were captured from the overall sample, and analysis of 16S ribosomal ribonucleic acid amplicon sequencing data indicated that HA did not notably impact species richness. Intriguingly, HA induced changes in bacterial community composition, along with the relative prevalence of specific taxa. Certain associations between soil chemical properties and abundance distribution have been uncovered. Notably, exchangeable Mg 2+ , Ca 2+ , and available phosphorus were strongly related to the relative abundance of bacterial phyla. Furthermore, HA potentially shaped the specific bacterial taxa, as the application of HA at different rates had distinct effects on the member of bacterial abundance of each taxon. These findings enhance our understanding of communities potentially being increased or shifted by HA rate addition in short‐term corn cultivation.
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Claims 5
Claim · model-written summary
The corn rhizosphere samples yielded 3601 bacterial operational taxonomic units.
- Taxon
- corn
Zea mays subsp. mayse0 - Outcome
- operational taxonomic unitse1
- Value
- 3601e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rhizosphere of corn ( Zea mays )”
e1“3601 operational taxonomic units were captured from the overall sample”
Claim · model-written summary
Humic acid did not notably affect rhizosphere bacterial species richness.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- HAe1
- Outcome
- species richnesse1
- Direction
- did not notably impacte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rhizosphere of corn ( Zea mays )”
e1“HA did not notably impact species richness”
Claim · model-written summary
Humic acid changed rhizosphere bacterial community composition and relative prevalence of specific taxa.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- HAe1
- Outcome
- bacterial community composition, along with the relative prevalence of specific taxae1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rhizosphere of corn ( Zea mays )”
e1“HA induced changes in bacterial community composition, along with the relative prevalence of specific taxa”
Claim · model-written summary
Exchangeable Mg 2+ , Ca 2+ , and available phosphorus were strongly related to bacterial phylum abundance.
- Taxon
- cornZea mays subsp. mayse0
- Compound
- Mg 2+ , Ca 2+ , and available phosphoruse1
- Outcome
- relative abundance of bacterial phylae1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rhizosphere of corn ( Zea mays )”
e1“exchangeable Mg 2+ , Ca 2+ , and available phosphorus were strongly related to the relative abundance of bacterial phyla”
Claim · model-written summary
Different humic acid rates had distinct effects on abundance of bacterial taxa.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- application of HA at different ratese1
- Outcome
- bacterial abundance of each taxone1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rhizosphere of corn ( Zea mays )”
e1“application of HA at different rates had distinct effects on the member of bacterial abundance of each taxon”
The same questions in other papers
other · ecology: diversity · Zea mays (maize)Positive and negative results
1 in the opposite direction
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.