Abstract
Abstract Excessive nitrogen (N) fertilizer input to agroecosystem fundamentally alters soil microbial properties and subsequent their ecofunctions such as carbon (C) sequestration and nutrient cycling in soil. However, between soils, the rhizobacterial community diversity and structure in response to N addition is not well understood, which is important to make proper N fertilization strategies to alleviate the negative impact of N addition on soil organic C and soil quality and maintain plant health in soils. Thus, a rhizo-box experiment was conducted with soybean grown in two soils, i.e. soil organic C (SOC)-poor and SOC-rich soil, supplied with three N rates in a range from 0 to 100 mg N kg −1 . The rhizospheric soil was collected 50 days after sowing and MiSeq sequencing was deployed to analyze the rhizobacterial community structure. The results showed that increasing N addition significantly decreased the number of phylotype of rhizobacteria by 12.3%, and decreased Shannon index from 5.98 to 5.36 irrespective of soils. Compared to the SOC-rich soil, the increases in abundances of Aquincola affiliated to Proteobacteria, and Streptomyces affiliated to Actinobacteria were greater in the SOC-poor soil in response to N addition. An opposite trend was observed for Ramlibacter belong to Proteobacteria. These results suggest that N addition reduced the rhizobacterial diversity and its influence on rhizobacterial community structure was soil-specific.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 5
Claim · model-written summary
Increasing nitrogen addition significantly lowered rhizobacterial phylotype number by 12.3%.
- Taxon
- soybean
Glycine maxe0 - Treatment
- increasing N additione1
- Interactor
- rhizobacteriaHyphomicrobialese1symbiont
- Outcome
- number of phylotype of rhizobacteriae1
- Direction
- decreasede1
- Value
- 12.3%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean grown in two soils”
e1“increasing N addition significantly decreased the number of phylotype of rhizobacteria by 12.3%”
Claim · model-written summary
Increasing nitrogen addition lowered rhizobacterial Shannon index from 5.98 to 5.36 regardless of soil.
- Taxon
- soybeanGlycine maxe0
- Treatment
- increasing N additione2
- Outcome
- Shannon indexe1
- Direction
- decreasede1
- Value
- 5.98 to 5.36e1
- Qualifier
- irrespective of soilse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean grown in two soils”
e1“decreased Shannon index from 5.98 to 5.36 irrespective of soils”
e2“increasing N addition”
Claim · model-written summary
Nitrogen-associated Aquincola abundance increases were greater in carbon-poor than carbon-rich soil.
- Taxon
- soybeanGlycine maxe0
- Outcome
- abundances of Aquincolae1
- Direction
- greatere1
- Comparator
- SOC-rich soile1
- Setting
- SOC-poor soile1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean grown in two soils”
e1“Compared to the SOC-rich soil, the increases in abundances of Aquincola affiliated to Proteobacteria, and Streptomyces affiliated to Actinobacteria were greater in the SOC-poor soil in response to N addition.”
Claim · model-written summary
Nitrogen-associated Streptomyces abundance increases were greater in carbon-poor than carbon-rich soil.
- Taxon
- soybeanGlycine maxe0
- Interactor
- Streptomyces
Streptomycese1symbiont - Outcome
- Streptomyces affiliated to Actinobacteriae1
- Direction
- greatere1
- Comparator
- SOC-rich soile1
- Setting
- SOC-poor soile1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean grown in two soils”
e1“Compared to the SOC-rich soil, the increases in abundances of Aquincola affiliated to Proteobacteria, and Streptomyces affiliated to Actinobacteria were greater in the SOC-poor soil in response to N addition.”
Claim · model-written summary
Ramlibacter showed the opposite soil-specific response to nitrogen addition.
- Taxon
- soybeanGlycine maxe0
- Interactor
- Ramlibacter
Ramlibactere1symbiont - Outcome
- opposite trende1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean grown in two soils”
e1“An opposite trend was observed for Ramlibacter belong to Proteobacteria.”
The same questions in other papers
nitrogen · ecology: diversity · Glycine max (soybean)Results agree
1 paper in the same direction as this paper
- no effect
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.