Abstract
Phenolics in Sphagnum can inhibit its microbial decomposition. Climate warming and drainage have driven vascular plants, such as Ericaceae, to expand into Sphagnum-dominated peatland. However, the impact of fine root invasion by Rhododendron auriculatum Hemsl. on Sphagnum decomposition and changes in phenolic compounds remains unclear. This study compared Sphagnum decomposition in a Sphagnum palustre L.-dominated peatland and an R. auriculatum (Sapling)–S. palustre peatland by examining the microscopic structure of S. palustre and microbial community composition. Decomposition was higher in the R. auriculatum–S. palustre peatland. On this site, bacterial metabolic types such as aerobic chemoheterotrophy and chemoheterotrophy had higher relative abundances, as did fungal trophic modes, including those with combined ectomycorrhizal, ericoid mycorrhizal, and saprotrophic functions. Acid phosphatase, laccase, total nitrogen (TN), C/N ratio (C:N), and pH differed significantly across decomposition stages. Microbial communities are affected by physicochemical factors and enzyme activities. Untargeted metabolomics revealed more downregulated than upregulated phenolics, cinnamic acids, and tannins, indicating loss of phenolic compounds. In summary, R. auriculatum fine root invasion altered enzyme activities and physicochemical properties, driving the restructuring of bacterial and fungal trophic modes and accelerating S. palustre cell wall and hyaline cell decomposition.
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Claims 9
Claim · model-written summary
Sphagnum decomposition was higher in the R. auriculatum–S. palustre peatland than in the S. palustre-dominated peatland.
- Taxon
- Sphagnum palustre
Sphagnum palustree0 - Treatment
- R. auriculatum (Sapling)e0
- Interactor
- R. auriculatum
Rhododendron auriculatume0other - Outcome
- Decompositione0
- Direction
- highere0
- Comparator
- Sphagnum palustre L.-dominated peatlande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study compared Sphagnum decomposition in a Sphagnum palustre L.-dominated peatland and an R. auriculatum (Sapling)–S. palustre peatland by examining the microscopic structure of S. palustre and microbial community composition. Decomposition was higher in the R. auriculatum–S. palustre peatland”
Claim · model-written summary
Bacterial metabolic types such as aerobic chemoheterotrophy and chemoheterotrophy had higher relative abundances in the R. auriculatum peatland.
- Taxon
- Sphagnum palustreSphagnum palustree0
- Interactor
- bacterial metabolic typese1other
- Outcome
- relative abundancese1
- Direction
- highere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study compared Sphagnum decomposition in a Sphagnum palustre L.-dominated peatland and an R. auriculatum (Sapling)–S. palustre peatland by examining the microscopic structure of S. palustre and microbial community composition. Decomposition was higher in the R. auriculatum–S. palustre peatland”
e1“bacterial metabolic types such as aerobic chemoheterotrophy and chemoheterotrophy had higher relative abundances, as did fungal trophic modes, including those with combined ectomycorrhizal, ericoid mycorrhizal, and saprotrophic functions”
Claim · model-written summary
Fungal trophic modes, including combined ectomycorrhizal, ericoid mycorrhizal and saprotrophic functions, also had higher relative abundances in the R. auriculatum peatland.
- Taxon
- Sphagnum palustreSphagnum palustree0
- Interactor
- fungal trophic modese1other
- Outcome
- relative abundancese1
- Direction
- highere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study compared Sphagnum decomposition in a Sphagnum palustre L.-dominated peatland and an R. auriculatum (Sapling)–S. palustre peatland by examining the microscopic structure of S. palustre and microbial community composition. Decomposition was higher in the R. auriculatum–S. palustre peatland”
e1“bacterial metabolic types such as aerobic chemoheterotrophy and chemoheterotrophy had higher relative abundances, as did fungal trophic modes, including those with combined ectomycorrhizal, ericoid mycorrhizal, and saprotrophic functions”
Claim · model-written summary
Acid phosphatase and laccase differed significantly across decomposition stages.
- Taxon
- Sphagnum palustreSphagnum palustree0
- Outcome
- Acid phosphatase, laccasee2
- Qualifier
- across decomposition stagese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study compared Sphagnum decomposition in a Sphagnum palustre L.-dominated peatland and an R. auriculatum (Sapling)–S. palustre peatland by examining the microscopic structure of S. palustre and microbial community composition. Decomposition was higher in the R. auriculatum–S. palustre peatland”
e2“Acid phosphatase, laccase, total nitrogen (TN), C/N ratio (C:N), and pH differed significantly across decomposition stages”
Claim · model-written summary
Total nitrogen, C/N ratio and pH differed significantly across decomposition stages.
- Taxon
- Sphagnum palustreSphagnum palustree0
- Outcome
- total nitrogen (TN), C/N ratio (C:N), and pHe2
- Qualifier
- across decomposition stagese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study compared Sphagnum decomposition in a Sphagnum palustre L.-dominated peatland and an R. auriculatum (Sapling)–S. palustre peatland by examining the microscopic structure of S. palustre and microbial community composition. Decomposition was higher in the R. auriculatum–S. palustre peatland”
e2“Acid phosphatase, laccase, total nitrogen (TN), C/N ratio (C:N), and pH differed significantly across decomposition stages”
Claim · model-written summary
Microbial communities are affected by physicochemical factors and enzyme activities in Sphagnum peat.
- Taxon
- Sphagnum palustreSphagnum palustree0
- Treatment
- physicochemical factors and enzyme activitiese3
- Outcome
- Microbial communitiese3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study compared Sphagnum decomposition in a Sphagnum palustre L.-dominated peatland and an R. auriculatum (Sapling)–S. palustre peatland by examining the microscopic structure of S. palustre and microbial community composition. Decomposition was higher in the R. auriculatum–S. palustre peatland”
e3“Microbial communities are affected by physicochemical factors and enzyme activities”
Claim · model-written summary
Phenolics, cinnamic acids and tannins were more downregulated than upregulated, indicating loss of phenolic compounds.
- Taxon
- Sphagnum palustreSphagnum palustree0
- Outcome
- phenolics, cinnamic acids, and tanninse4
- Direction
- downregulatede4
- Qualifier
- indicating loss of phenolic compoundse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study compared Sphagnum decomposition in a Sphagnum palustre L.-dominated peatland and an R. auriculatum (Sapling)–S. palustre peatland by examining the microscopic structure of S. palustre and microbial community composition. Decomposition was higher in the R. auriculatum–S. palustre peatland”
e4“Untargeted metabolomics revealed more downregulated than upregulated phenolics, cinnamic acids, and tannins, indicating loss of phenolic compounds”
Claim · model-written summary
R. auriculatum fine root invasion accelerated S. palustre cell wall and hyaline cell decomposition.
- Taxon
- S. palustreSphagnum palustree5
- Treatment
- R. auriculatum fine root invasione5
- Interactor
- R. auriculatumRhododendron auriculatume5other
- Outcome
- cell wall and hyaline cell decompositione5
- Direction
- acceleratinge5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“R. auriculatum fine root invasion altered enzyme activities and physicochemical properties, driving the restructuring of bacterial and fungal trophic modes and accelerating S. palustre cell wall and hyaline cell decomposition”
Claim · model-written summary
R. auriculatum fine root invasion, through altered enzyme activities and physicochemical properties, is suggested to drive restructuring of bacterial and fungal trophic modes in Sphagnum peat.
- Taxon
- S. palustreSphagnum palustree5
- Treatment
- R. auriculatum fine root invasione5
- Outcome
- restructuring of bacterial and fungal trophic modese5
- Qualifier
- altered enzyme activities and physicochemical propertiese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“R. auriculatum fine root invasion altered enzyme activities and physicochemical properties, driving the restructuring of bacterial and fungal trophic modes and accelerating S. palustre cell wall and hyaline cell decomposition”